Beispiel #1
0
int
get_pgfunc(lua_State *L)
{
	Lua_pgfunc *lf;
	Pgfunc_options opt;
	MemoryContext m;
	const char* reg_name = NULL;
	HeapTuple proctup;
	Form_pg_proc proc;
	int luasrc = 0;
	Oid funcid = 0;

	BEGINLUA;

	opt.only_internal = true;
	opt.throwable = true;

	if (lua_gettop(L) == 2){
		luaL_checktype(L, 2, LUA_TTABLE);
		parse_options(L, &opt);
	}else if (lua_gettop(L) != 1){
		return luaL_error(L, "pgfunc(text): wrong arguments");
	}
	if(lua_type(L, 1) == LUA_TSTRING){
		reg_name = luaL_checkstring(L, 1);
		m = MemoryContextSwitchTo(tmpcontext);
		PG_TRY();
		{
			funcid = DatumGetObjectId(DirectFunctionCall1(regprocedurein, CStringGetDatum(reg_name)));
		}
		PG_CATCH();{}
		PG_END_TRY();
		MemoryContextSwitchTo(m);
		MemoryContextReset(tmpcontext);
	}else if (lua_type(L, 1) == LUA_TNUMBER){
		funcid = luaL_checkinteger(L, 1);
	}

	if (!OidIsValid(funcid)){
		if (reg_name)
			return luaL_error(L,"failed to register %s", reg_name);
		return luaL_error(L,"failed to register function with oid %d", funcid);
	}

	proctup = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcid));
	if (!HeapTupleIsValid(proctup)){
		return luaL_error(L,"cache lookup failed for function %d", funcid);
	}

	proc = (Form_pg_proc) GETSTRUCT(proctup);

	luasrc = ((proc->prolang == get_pllua_oid())
		  || (proc->prolang == get_plluau_oid()));
	if ( opt.only_internal
			&&(proc->prolang != INTERNALlanguageId)
			&&(!luasrc) ){
		ReleaseSysCache(proctup);
		return luaL_error(L, "supported only SQL/internal functions");
	}


	lf = (Lua_pgfunc *)lua_newuserdata(L, sizeof(Lua_pgfunc));

	/*make it g/collected*/
	luaP_getfield(L, pg_func_type_name);
	lua_setmetatable(L, -2);


	lf->prorettype = proc->prorettype;
	lf->funcid = funcid;
	lf->options = opt;

	{
		Oid *argtypes;
		char **argnames;
		char *argmodes;
		int argc;
		MemoryContext cur = CurrentMemoryContext;

		MemoryContextSwitchTo(tmpcontext);

		argc = get_func_arg_info(proctup,
					 &argtypes, &argnames, &argmodes);

		MemoryContextSwitchTo(get_common_ctx());

		lf->numargs = argc;
		lf->argtypes = (Oid*)palloc(argc * sizeof(Oid));
		memcpy(lf->argtypes, argtypes, argc * sizeof(Oid));
		MemoryContextSwitchTo(cur);
		MemoryContextReset(tmpcontext);
	}

	if (luasrc){
		bool isnull;
		text *t;
		const char *s;
		luaL_Buffer b;
		int pcall_result;
		Datum prosrc;

		if((lf->numargs != 1)
				|| (lf->argtypes[0] != INTERNALOID)
				|| (lf->prorettype != INTERNALOID)){
			luaL_error(L, "pgfunc accepts only 'internal' pllua/u functions with internal argument");
		}

		prosrc = SysCacheGetAttr(PROCOID, proctup, Anum_pg_proc_prosrc, &isnull);
		if (isnull) elog(ERROR, "[pgfunc]: null lua prosrc");
		luaL_buffinit(L, &b);

		luaL_addstring(&b,"do ");
		t = DatumGetTextP(prosrc);
		luaL_addlstring(&b, VARDATA(t), VARSIZE(t) - VARHDRSZ);
		luaL_addstring(&b, " end");
		luaL_pushresult(&b);
		s = lua_tostring(L, -1);

		ReleaseSysCache(proctup);
		clean_pgfuncinfo(lf);

		if (luaL_loadbuffer(L, s, strlen(s), "pgfunc chunk"))
			luaL_error(L, "compile");

		lua_remove(L, -2); /*delete source element*/

		pcall_result = lua_pcall(L, 0, 1, 0);
		lua_remove(L, -2); /*delete chunk*/
		if(pcall_result == 0){
			ENDLUAV(1);
			return 1;
		}

		if( pcall_result == LUA_ERRRUN)
			luaL_error(L,"%s %s","Runtime error:",lua_tostring(L, -1));
		else if(pcall_result == LUA_ERRMEM)
			luaL_error(L,"%s %s","Memory error:",lua_tostring(L, -1));
		else if(pcall_result == LUA_ERRERR)
			luaL_error(L,"%s %s","Error:",lua_tostring(L, -1));

		return luaL_error(L, "pgfunc unknown error");
	}

	if(proc->proretset) {
		lua_pushcclosure(L, pgfunc_rows, 1);
	} else {
		fmgr_info(funcid, &lf->fi);
		lua_pushcclosure(L, pg_callable_func, 1);
	}



	ReleaseSysCache(proctup);

	ENDLUAV(1);
	return 1;
}
Beispiel #2
0
/*
 * initSuffixTree  - create suffix tree from file. Function converts
 * UTF8-encoded file into current encoding.
 */
static SuffixChar *
initSuffixTree(char *filename)
{
	SuffixChar *volatile rootSuffixTree = NULL;
	MemoryContext ccxt = CurrentMemoryContext;
	tsearch_readline_state trst;
	volatile bool skip;

	filename = get_tsearch_config_filename(filename, "rules");
	if (!tsearch_readline_begin(&trst, filename))
		ereport(ERROR,
				(errcode(ERRCODE_CONFIG_FILE_ERROR),
				 errmsg("could not open unaccent file \"%s\": %m",
						filename)));

	do
	{
		/*
		 * pg_do_encoding_conversion() (called by tsearch_readline()) will
		 * emit exception if it finds untranslatable characters in current
		 * locale. We just skip such lines, continuing with the next.
		 */
		skip = true;

		PG_TRY();
		{
			char	   *line;

			while ((line = tsearch_readline(&trst)) != NULL)
			{
				/*
				 * The format of each line must be "src trg" where src and trg
				 * are sequences of one or more non-whitespace characters,
				 * separated by whitespace.  Whitespace at start or end of
				 * line is ignored.
				 */
				int			state;
				char	   *ptr;
				char	   *src = NULL;
				char	   *trg = NULL;
				int			ptrlen;
				int			srclen = 0;
				int			trglen = 0;

				state = 0;
				for (ptr = line; *ptr; ptr += ptrlen)
				{
					ptrlen = pg_mblen(ptr);
					/* ignore whitespace, but end src or trg */
					if (t_isspace(ptr))
					{
						if (state == 1)
							state = 2;
						else if (state == 3)
							state = 4;
						continue;
					}
					switch (state)
					{
						case 0:
							/* start of src */
							src = ptr;
							srclen = ptrlen;
							state = 1;
							break;
						case 1:
							/* continue src */
							srclen += ptrlen;
							break;
						case 2:
							/* start of trg */
							trg = ptr;
							trglen = ptrlen;
							state = 3;
							break;
						case 3:
							/* continue trg */
							trglen += ptrlen;
							break;
						default:
							/* bogus line format */
							state = -1;
							break;
					}
				}

				if (state >= 3)
					rootSuffixTree = placeChar(rootSuffixTree,
											   (unsigned char *) src, srclen,
											   trg, trglen);

				pfree(line);
			}
			skip = false;
		}
		PG_CATCH();
		{
			ErrorData  *errdata;
			MemoryContext ecxt;

			ecxt = MemoryContextSwitchTo(ccxt);
			errdata = CopyErrorData();
			if (errdata->sqlerrcode == ERRCODE_UNTRANSLATABLE_CHARACTER)
			{
				FlushErrorState();
			}
			else
			{
				MemoryContextSwitchTo(ecxt);
				PG_RE_THROW();
			}
		}
		PG_END_TRY();
	}
	while (skip);

	tsearch_readline_end(&trst);

	return rootSuffixTree;
}
Beispiel #3
0
/* function subhandler */
Datum
PLy_exec_function(FunctionCallInfo fcinfo, PLyProcedure *proc)
{
	Datum		rv;
	PyObject   *volatile plargs = NULL;
	PyObject   *volatile plrv = NULL;
	ErrorContextCallback plerrcontext;

	PG_TRY();
	{
		if (!proc->is_setof || proc->setof == NULL)
		{
			/*
			 * Simple type returning function or first time for SETOF
			 * function: actually execute the function.
			 */
			plargs = PLy_function_build_args(fcinfo, proc);
			plrv = PLy_procedure_call(proc, "args", plargs);
			if (!proc->is_setof)
			{
				/*
				 * SETOF function parameters will be deleted when last row is
				 * returned
				 */
				PLy_function_delete_args(proc);
			}
			Assert(plrv != NULL);
		}

		/*
		 * If it returns a set, call the iterator to get the next return item.
		 * We stay in the SPI context while doing this, because PyIter_Next()
		 * calls back into Python code which might contain SPI calls.
		 */
		if (proc->is_setof)
		{
			bool		has_error = false;
			ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;

			if (proc->setof == NULL)
			{
				/* first time -- do checks and setup */
				if (!rsi || !IsA(rsi, ReturnSetInfo) ||
					(rsi->allowedModes & SFRM_ValuePerCall) == 0)
				{
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("unsupported set function return mode"),
							 errdetail("PL/Python set-returning functions only support returning only value per call.")));
				}
				rsi->returnMode = SFRM_ValuePerCall;

				/* Make iterator out of returned object */
				proc->setof = PyObject_GetIter(plrv);
				Py_DECREF(plrv);
				plrv = NULL;

				if (proc->setof == NULL)
					ereport(ERROR,
							(errcode(ERRCODE_DATATYPE_MISMATCH),
							 errmsg("returned object cannot be iterated"),
							 errdetail("PL/Python set-returning functions must return an iterable object.")));
			}

			/* Fetch next from iterator */
			plrv = PyIter_Next(proc->setof);
			if (plrv)
				rsi->isDone = ExprMultipleResult;
			else
			{
				rsi->isDone = ExprEndResult;
				has_error = PyErr_Occurred() != NULL;
			}

			if (rsi->isDone == ExprEndResult)
			{
				/* Iterator is exhausted or error happened */
				Py_DECREF(proc->setof);
				proc->setof = NULL;

				Py_XDECREF(plargs);
				Py_XDECREF(plrv);

				PLy_function_delete_args(proc);

				if (has_error)
					PLy_elog(ERROR, "error fetching next item from iterator");

				/* Disconnect from the SPI manager before returning */
				if (SPI_finish() != SPI_OK_FINISH)
					elog(ERROR, "SPI_finish failed");

				fcinfo->isnull = true;
				return (Datum) NULL;
			}
		}

		/*
		 * Disconnect from SPI manager and then create the return values datum
		 * (if the input function does a palloc for it this must not be
		 * allocated in the SPI memory context because SPI_finish would free
		 * it).
		 */
		if (SPI_finish() != SPI_OK_FINISH)
			elog(ERROR, "SPI_finish failed");

		plerrcontext.callback = plpython_return_error_callback;
		plerrcontext.previous = error_context_stack;
		error_context_stack = &plerrcontext;

		/*
		 * If the function is declared to return void, the Python return value
		 * must be None. For void-returning functions, we also treat a None
		 * return value as a special "void datum" rather than NULL (as is the
		 * case for non-void-returning functions).
		 */
		if (proc->result.out.d.typoid == VOIDOID)
		{
			if (plrv != Py_None)
				ereport(ERROR,
						(errcode(ERRCODE_DATATYPE_MISMATCH),
						 errmsg("PL/Python function with return type \"void\" did not return None")));

			fcinfo->isnull = false;
			rv = (Datum) 0;
		}
		else if (plrv == Py_None)
		{
			fcinfo->isnull = true;
			if (proc->result.is_rowtype < 1)
				rv = InputFunctionCall(&proc->result.out.d.typfunc,
									   NULL,
									   proc->result.out.d.typioparam,
									   -1);
			else
				/* Tuple as None */
				rv = (Datum) NULL;
		}
		else if (proc->result.is_rowtype >= 1)
		{
			TupleDesc	desc;

			/* make sure it's not an unnamed record */
			Assert((proc->result.out.d.typoid == RECORDOID &&
					proc->result.out.d.typmod != -1) ||
				   (proc->result.out.d.typoid != RECORDOID &&
					proc->result.out.d.typmod == -1));

			desc = lookup_rowtype_tupdesc(proc->result.out.d.typoid,
										  proc->result.out.d.typmod);

			rv = PLyObject_ToCompositeDatum(&proc->result, desc, plrv);
			fcinfo->isnull = (rv == (Datum) NULL);
		}
		else
		{
			fcinfo->isnull = false;
			rv = (proc->result.out.d.func) (&proc->result.out.d, -1, plrv);
		}
	}
	PG_CATCH();
	{
		Py_XDECREF(plargs);
		Py_XDECREF(plrv);

		/*
		 * If there was an error the iterator might have not been exhausted
		 * yet. Set it to NULL so the next invocation of the function will
		 * start the iteration again.
		 */
		Py_XDECREF(proc->setof);
		proc->setof = NULL;

		PG_RE_THROW();
	}
	PG_END_TRY();

	error_context_stack = plerrcontext.previous;

	Py_XDECREF(plargs);
	Py_DECREF(plrv);

	return rv;
}
Beispiel #4
0
/*
 * Assign hook routine for "gp_role" option.  This variablle has context
 * PGC_SUSET so that is can only be set by a superuser via the SET command.
 * (It can also be set using an option on postmaster start, but this isn't
 * interesting beccause the derived global CdbRole is always set (along with
 * CdbSessionRole) on backend startup for a new connection.
 *
 * See src/backend/util/misc/guc.c for option definition.
 */
const char *
assign_gp_role(const char *newval, bool doit, GucSource source)
{

#if FALSE
	elog(DEBUG1, "assign_gp_role: gp_role=%s, newval=%s, doit=%s",
		 show_gp_role(), newval, (doit ? "true" : "false"));
#endif


	GpRoleValue newrole = string_to_role(newval);
	GpRoleValue oldrole = Gp_role;

	if (newrole == GP_ROLE_UNDEFINED)
	{
		return NULL;
	}

	if (doit)
	{
		/*
		 * When changing between roles, we must
		 * call cdb_cleanup and then cdb_setup to get
		 * setup and connections appropriate to the new role.
		 */
		bool		do_disconnect = false;
		bool		do_connect = false;

		if (Gp_role != newrole && IsUnderPostmaster)
		{
			if (Gp_role != GP_ROLE_UTILITY)
				do_disconnect = true;

			if (newrole != GP_ROLE_UTILITY)
				do_connect = true;
		}

		if (do_disconnect)
			cdb_cleanup(0,0);

		Gp_role = newrole;

		if (source != PGC_S_DEFAULT)
		{
			if (do_connect)
			{
				/*
				 * In case there are problems with the Greenplum Database tables or data,
				 * we catch any error coming out of cdblink_setup so we can set the
				 * gp_role back to what it was.  Otherwise we may be left with
				 * inappropriate connections for the new role.
				 */
				PG_TRY();
				{
					cdb_setup();
				}
				PG_CATCH();
				{
					cdb_cleanup(0,0);
					Gp_role = oldrole;
					if (Gp_role != GP_ROLE_UTILITY)
						cdb_setup();
					PG_RE_THROW();
				}
				PG_END_TRY();
			}
		}
	}

	return newval;
}
Beispiel #5
0
static bool
ServiceClientPollRead(ServiceClient *serviceClient, void* response, int responseLen, bool *pollResponseReceived)
{
	ServiceConfig 	*serviceConfig;
	int				n;
	int				saved_err;
	char            *message;
	bool		    result = false;
	DECLARE_SAVE_SUPPRESS_PANIC();

	Assert(serviceClient != NULL);
	serviceConfig = serviceClient->serviceConfig;
	Assert(serviceConfig != NULL);
	Assert(response != NULL);

	PG_TRY();
	{
		SUPPRESS_PANIC();

		/*
		 * Attempt to read the response
		 */
		while (true)
		{
			n = read(serviceClient->sockfd,
				     ((char *)response),
				     responseLen);
			saved_err = errno;

			if (n == 0)
			{
				ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
								 errmsg("Connection to '%s' is closed",
								         serviceConfig->title)));
			}
			else if (n < 0)
			{
				if (saved_err == EWOULDBLOCK)
				{
					*pollResponseReceived = false;
					break;
				}

				if (saved_err == EINTR)
					continue;

				ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
								 errmsg("Read error from '%s': %s",
								        serviceConfig->title,
								        strerror(saved_err))));
			}

			if (n != responseLen)
			{
				ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
								 errmsg("Expecting message length %d and actual read length was %d from '%s'",
					 			        responseLen, n,
					 			        serviceConfig->title)));
				return false;
			}

			*pollResponseReceived = true;
			break;
		}

		result = true;
		RESTORE_PANIC();
	}
	PG_CATCH();
	{
		RESTORE_PANIC();

		/* Report the error to the server log */
	    if (!elog_demote(WARNING))
    	{
    		elog(LOG,"unable to demote error");
        	PG_RE_THROW();
    	}

		message = elog_message();
 		if (message != NULL && strlen(message) + 1 < sizeof(ClientErrorString))
			strcpy(ClientErrorString, message);
		else
			strcpy(ClientErrorString, "");

		EmitErrorReport();
		FlushErrorState();

		result = false;
	}
	PG_END_TRY();

	return result;
}
Beispiel #6
0
/* trigger subhandler
 *
 * the python function is expected to return Py_None if the tuple is
 * acceptable and unmodified.  Otherwise it should return a PyString
 * object who's value is SKIP, or MODIFY.  SKIP means don't perform
 * this action.  MODIFY means the tuple has been modified, so update
 * tuple and perform action.  SKIP and MODIFY assume the trigger fires
 * BEFORE the event and is ROW level.  postgres expects the function
 * to take no arguments and return an argument of type trigger.
 */
HeapTuple
PLy_exec_trigger(FunctionCallInfo fcinfo, PLyProcedure *proc)
{
	HeapTuple	rv = NULL;
	PyObject   *volatile plargs = NULL;
	PyObject   *volatile plrv = NULL;
	TriggerData *tdata;

	Assert(CALLED_AS_TRIGGER(fcinfo));

	/*
	 * Input/output conversion for trigger tuples.  Use the result TypeInfo
	 * variable to store the tuple conversion info.  We do this over again on
	 * each call to cover the possibility that the relation's tupdesc changed
	 * since the trigger was last called. PLy_input_tuple_funcs and
	 * PLy_output_tuple_funcs are responsible for not doing repetitive work.
	 */
	tdata = (TriggerData *) fcinfo->context;

	PLy_input_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att);
	PLy_output_tuple_funcs(&(proc->result), tdata->tg_relation->rd_att);

	PG_TRY();
	{
		plargs = PLy_trigger_build_args(fcinfo, proc, &rv);
		plrv = PLy_procedure_call(proc, "TD", plargs);

		Assert(plrv != NULL);

		/*
		 * Disconnect from SPI manager
		 */
		if (SPI_finish() != SPI_OK_FINISH)
			elog(ERROR, "SPI_finish failed");

		/*
		 * return of None means we're happy with the tuple
		 */
		if (plrv != Py_None)
		{
			char	   *srv;

			if (PyString_Check(plrv))
				srv = PyString_AsString(plrv);
			else if (PyUnicode_Check(plrv))
				srv = PLyUnicode_AsString(plrv);
			else
			{
				ereport(ERROR,
						(errcode(ERRCODE_DATA_EXCEPTION),
					errmsg("unexpected return value from trigger procedure"),
						 errdetail("Expected None or a string.")));
				srv = NULL;		/* keep compiler quiet */
			}

			if (pg_strcasecmp(srv, "SKIP") == 0)
				rv = NULL;
			else if (pg_strcasecmp(srv, "MODIFY") == 0)
			{
				TriggerData *tdata = (TriggerData *) fcinfo->context;

				if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event) ||
					TRIGGER_FIRED_BY_UPDATE(tdata->tg_event))
					rv = PLy_modify_tuple(proc, plargs, tdata, rv);
				else
					ereport(WARNING,
							(errmsg("PL/Python trigger function returned \"MODIFY\" in a DELETE trigger -- ignored")));
			}
			else if (pg_strcasecmp(srv, "OK") != 0)
			{
				/*
				 * accept "OK" as an alternative to None; otherwise, raise an
				 * error
				 */
				ereport(ERROR,
						(errcode(ERRCODE_DATA_EXCEPTION),
					errmsg("unexpected return value from trigger procedure"),
						 errdetail("Expected None, \"OK\", \"SKIP\", or \"MODIFY\".")));
			}
		}
	}
	PG_CATCH();
	{
		Py_XDECREF(plargs);
		Py_XDECREF(plrv);

		PG_RE_THROW();
	}
	PG_END_TRY();

	Py_DECREF(plargs);
	Py_DECREF(plrv);

	return rv;
}
Beispiel #7
0
inline
void *
Allocator::internalAllocate(void *inPtr, const size_t inSize) const {
    // Avoid warning that inPtr is not used if R == NewAllocation
    (void) inPtr;

    void *ptr;
    bool errorOccurred = false;
    MemoryContext oldContext = NULL;
    MemoryContext aggContext = NULL;

    if (F == dbal::ReturnNULL) {
        /*
         * HOLD_INTERRUPTS() and RESUME_INTERRUPTS() only change the value of a
         * global variable but have no other side effects. In particular, they
         * do not call CHECK_INTERRUPTS(). Hence, we are save to use these
         * macros outside of a PG_TRY() block.
         */
        HOLD_INTERRUPTS();
    }

    PG_TRY(); {
        if (MC == dbal::AggregateContext) {
            if (!AggCheckCallContext(fcinfo, &aggContext))
                errorOccurred = true;
            else {
                oldContext = MemoryContextSwitchTo(aggContext);
                ptr = (R == Reallocation) ? internalRePalloc<ZM>(inPtr, inSize)
                                          : internalPalloc<ZM>(inSize);
                MemoryContextSwitchTo(oldContext);
            }
        } else {
            ptr = R ? internalRePalloc<ZM>(inPtr, inSize)
                    : internalPalloc<ZM>(inSize);
        }
    } PG_CATCH(); {
        if (F == dbal::ReturnNULL) {
            /*
             * This cannot be due to an interrupt, so it's reasonably safe
             * to assume that the PG exception was a pure memory-allocation
             * issue. We ignore the error and flush the error state.
             * Flushing is necessary for leaving the error state (e.g., the memory
             * context is restored).
             */
            FlushErrorState();
            ptr = NULL;
        } else {
            /*
             * PostgreSQL error messages can be stacked. So, it doesn't hurt to add
             * our own message. After unwinding the C++ stack, the PostgreSQL
             * exception will be re-thrown into the PostgreSQL C code.
             *
             * Throwing C++ exceptions inside a PG_CATCH block is not problematic
             * per se, but it is good practise to keep the exception mechanisms clearly
             * separated.
             */

            errorOccurred = true;
        }
    } PG_END_TRY();

    if (errorOccurred) {
        PG_TRY(); {
            // Clean up after ourselves
            if (oldContext != NULL)
                MemoryContextSwitchTo(oldContext);
        } PG_CATCH(); {
            if (F == dbal::ReturnNULL) {
                // We tried to clean up after ourselves. If this fails, we can
                // only ignore the issue.
                FlushErrorState();
            }
            // Else do nothing. We will add a bad-allocation exception on top of
            // the existing PostgreSQL exception stack.
        } PG_END_TRY();
    }

    if (F == dbal::ReturnNULL) {
        RESUME_INTERRUPTS();
    }

    if (errorOccurred || !ptr)
        // We do not want to interleave PG exceptions and C++ exceptions.
        throw std::bad_alloc();

    return ptr;
}
Beispiel #8
0
static bool
ServiceDoConnect(ServiceConfig *serviceConfig, int listenerPort, ServiceClient *serviceClient, bool complain)
{
	int  n;
	struct sockaddr_in addr;
	int saved_err;
	char        *message;
	bool		result = false;
	DECLARE_SAVE_SUPPRESS_PANIC();

	PG_TRY();
	{
		SUPPRESS_PANIC();

		for (;;)
		{
			/*
			 * Open a connection to the service.
			 */
			serviceClient->sockfd = socket(AF_INET, SOCK_STREAM, 0);

			addr.sin_family = AF_INET;
			addr.sin_port = htons(listenerPort);
			addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

			if ((n = connect(serviceClient->sockfd, (struct sockaddr *)&addr, sizeof(addr))) < 0)
			{
				saved_err = errno;

				close(serviceClient->sockfd);
				serviceClient->sockfd = -1;

				if (errno == EINTR)
					continue;

				ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
								errmsg("Could not connect to '%s': %s",
									   serviceConfig->title,
									   strerror(saved_err))));
			}
			else
			{
				//success. we're done here!
				break;
			}
		}

		/* make socket non-blocking BEFORE we connect. */
		if (!pg_set_noblock(serviceClient->sockfd))
		{
			saved_err = errno;

			close(serviceClient->sockfd);
			serviceClient->sockfd = -1;
			ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
							errmsg("Could not set '%s' socket to non-blocking mode: %s",
								   serviceConfig->title,
								   strerror(saved_err))));
		}

		result = true;
		RESTORE_PANIC();
	}
	PG_CATCH();
	{
		RESTORE_PANIC();

		/* Report the error to the server log */
	    if (!elog_demote(WARNING))
    	{
    		elog(LOG,"unable to demote error");
        	PG_RE_THROW();
    	}

		message = elog_message();
 		if (message != NULL && strlen(message) + 1 < sizeof(ClientErrorString))
			strcpy(ClientErrorString, message);
		else
			strcpy(ClientErrorString, "");

		if (complain)
			EmitErrorReport();
		FlushErrorState();

		result = false;
	}
	PG_END_TRY();

	return result;
}
Beispiel #9
0
/*
 * Create a new PLyProcedure structure
 */
static PLyProcedure *
PLy_procedure_create(HeapTuple procTup, Oid fn_oid, bool is_trigger)
{
	char		procName[NAMEDATALEN + 256];
	Form_pg_proc procStruct;
	PLyProcedure *volatile proc;
	MemoryContext cxt;
	MemoryContext oldcxt;
	int			rv;
	char	   *ptr;

	procStruct = (Form_pg_proc) GETSTRUCT(procTup);
	rv = snprintf(procName, sizeof(procName),
				  "__plpython_procedure_%s_%u",
				  NameStr(procStruct->proname),
				  fn_oid);
	if (rv >= sizeof(procName) || rv < 0)
		elog(ERROR, "procedure name would overrun buffer");

	/* Replace any not-legal-in-Python-names characters with '_' */
	for (ptr = procName; *ptr; ptr++)
	{
		if (!((*ptr >= 'A' && *ptr <= 'Z') ||
			  (*ptr >= 'a' && *ptr <= 'z') ||
			  (*ptr >= '0' && *ptr <= '9')))
			*ptr = '_';
	}

	cxt = AllocSetContextCreate(TopMemoryContext,
								procName,
								ALLOCSET_DEFAULT_MINSIZE,
								ALLOCSET_DEFAULT_INITSIZE,
								ALLOCSET_DEFAULT_MAXSIZE);

	oldcxt = MemoryContextSwitchTo(cxt);

	proc = (PLyProcedure *) palloc0(sizeof(PLyProcedure));
	proc->mcxt = cxt;

	PG_TRY();
	{
		Datum		protrftypes_datum;
		Datum		prosrcdatum;
		bool		isnull;
		char	   *procSource;
		int			i;

		proc->proname = pstrdup(NameStr(procStruct->proname));
		proc->pyname = pstrdup(procName);
		proc->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data);
		proc->fn_tid = procTup->t_self;
		/* Remember if function is STABLE/IMMUTABLE */
		proc->fn_readonly =
			(procStruct->provolatile != PROVOLATILE_VOLATILE);
		PLy_typeinfo_init(&proc->result, proc->mcxt);
		for (i = 0; i < FUNC_MAX_ARGS; i++)
			PLy_typeinfo_init(&proc->args[i], proc->mcxt);
		proc->nargs = 0;
		proc->langid = procStruct->prolang;
		protrftypes_datum = SysCacheGetAttr(PROCOID, procTup,
											Anum_pg_proc_protrftypes,
											&isnull);
		proc->trftypes = isnull ? NIL : oid_array_to_list(protrftypes_datum);
		proc->code = proc->statics = NULL;
		proc->globals = NULL;
		proc->is_setof = procStruct->proretset;
		proc->setof = NULL;
		proc->src = NULL;
		proc->argnames = NULL;

		/*
		 * get information required for output conversion of the return value,
		 * but only if this isn't a trigger.
		 */
		if (!is_trigger)
		{
			HeapTuple	rvTypeTup;
			Form_pg_type rvTypeStruct;

			rvTypeTup = SearchSysCache1(TYPEOID,
								   ObjectIdGetDatum(procStruct->prorettype));
			if (!HeapTupleIsValid(rvTypeTup))
				elog(ERROR, "cache lookup failed for type %u",
					 procStruct->prorettype);
			rvTypeStruct = (Form_pg_type) GETSTRUCT(rvTypeTup);

			/* Disallow pseudotype result, except for void or record */
			if (rvTypeStruct->typtype == TYPTYPE_PSEUDO)
			{
				if (procStruct->prorettype == TRIGGEROID)
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
							 errmsg("trigger functions can only be called as triggers")));
				else if (procStruct->prorettype != VOIDOID &&
						 procStruct->prorettype != RECORDOID)
					ereport(ERROR,
							(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
						  errmsg("PL/Python functions cannot return type %s",
								 format_type_be(procStruct->prorettype))));
			}

			if (rvTypeStruct->typtype == TYPTYPE_COMPOSITE ||
				procStruct->prorettype == RECORDOID)
			{
				/*
				 * Tuple: set up later, during first call to
				 * PLy_function_handler
				 */
				proc->result.out.d.typoid = procStruct->prorettype;
				proc->result.out.d.typmod = -1;
				proc->result.is_rowtype = 2;
			}
			else
			{
				/* do the real work */
				PLy_output_datum_func(&proc->result, rvTypeTup, proc->langid, proc->trftypes);
			}

			ReleaseSysCache(rvTypeTup);
		}

		/*
		 * Now get information required for input conversion of the
		 * procedure's arguments.  Note that we ignore output arguments here.
		 * If the function returns record, those I/O functions will be set up
		 * when the function is first called.
		 */
		if (procStruct->pronargs)
		{
			Oid		   *types;
			char	  **names,
					   *modes;
			int			pos,
						total;

			/* extract argument type info from the pg_proc tuple */
			total = get_func_arg_info(procTup, &types, &names, &modes);

			/* count number of in+inout args into proc->nargs */
			if (modes == NULL)
				proc->nargs = total;
			else
			{
				/* proc->nargs was initialized to 0 above */
				for (i = 0; i < total; i++)
				{
					if (modes[i] != PROARGMODE_OUT &&
						modes[i] != PROARGMODE_TABLE)
						(proc->nargs)++;
				}
			}

			proc->argnames = (char **) palloc0(sizeof(char *) * proc->nargs);
			for (i = pos = 0; i < total; i++)
			{
				HeapTuple	argTypeTup;
				Form_pg_type argTypeStruct;

				if (modes &&
					(modes[i] == PROARGMODE_OUT ||
					 modes[i] == PROARGMODE_TABLE))
					continue;	/* skip OUT arguments */

				Assert(types[i] == procStruct->proargtypes.values[pos]);

				argTypeTup = SearchSysCache1(TYPEOID,
											 ObjectIdGetDatum(types[i]));
				if (!HeapTupleIsValid(argTypeTup))
					elog(ERROR, "cache lookup failed for type %u", types[i]);
				argTypeStruct = (Form_pg_type) GETSTRUCT(argTypeTup);

				/* check argument type is OK, set up I/O function info */
				switch (argTypeStruct->typtype)
				{
					case TYPTYPE_PSEUDO:
						/* Disallow pseudotype argument */
						ereport(ERROR,
								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
						  errmsg("PL/Python functions cannot accept type %s",
								 format_type_be(types[i]))));
						break;
					case TYPTYPE_COMPOSITE:
						/* we'll set IO funcs at first call */
						proc->args[pos].is_rowtype = 2;
						break;
					default:
						PLy_input_datum_func(&(proc->args[pos]),
											 types[i],
											 argTypeTup,
											 proc->langid,
											 proc->trftypes);
						break;
				}

				/* get argument name */
				proc->argnames[pos] = names ? pstrdup(names[i]) : NULL;

				ReleaseSysCache(argTypeTup);

				pos++;
			}
		}

		/*
		 * get the text of the function.
		 */
		prosrcdatum = SysCacheGetAttr(PROCOID, procTup,
									  Anum_pg_proc_prosrc, &isnull);
		if (isnull)
			elog(ERROR, "null prosrc");
		procSource = TextDatumGetCString(prosrcdatum);

		PLy_procedure_compile(proc, procSource);

		pfree(procSource);
	}
	PG_CATCH();
	{
		MemoryContextSwitchTo(oldcxt);
		PLy_procedure_delete(proc);
		PG_RE_THROW();
	}
	PG_END_TRY();

	MemoryContextSwitchTo(oldcxt);
	return proc;
}
Beispiel #10
0
/*
 * Primary entry point for VACUUM and ANALYZE commands.
 *
 * options is a bitmask of VacuumOption flags, indicating what to do.
 *
 * relid, if not InvalidOid, indicate the relation to process; otherwise,
 * the RangeVar is used.  (The latter must always be passed, because it's
 * used for error messages.)
 *
 * params contains a set of parameters that can be used to customize the
 * behavior.
 *
 * va_cols is a list of columns to analyze, or NIL to process them all.
 *
 * bstrategy is normally given as NULL, but in autovacuum it can be passed
 * in to use the same buffer strategy object across multiple vacuum() calls.
 *
 * isTopLevel should be passed down from ProcessUtility.
 *
 * It is the caller's responsibility that all parameters are allocated in a
 * memory context that will not disappear at transaction commit.
 */
void
vacuum(int options, RangeVar *relation, Oid relid, VacuumParams *params,
	   List *va_cols, BufferAccessStrategy bstrategy, bool isTopLevel)
{
  // TODO :: Peloton Changes
  // Disabled vacuumming in Postgres
  if(false){
	const char *stmttype;
	volatile bool in_outer_xact,
				use_own_xacts;
	List	   *relations;
	static bool in_vacuum = false;

	Assert(params != NULL);

	stmttype = (options & VACOPT_VACUUM) ? "VACUUM" : "ANALYZE";

	/*
	 * We cannot run VACUUM inside a user transaction block; if we were inside
	 * a transaction, then our commit- and start-transaction-command calls
	 * would not have the intended effect!	There are numerous other subtle
	 * dependencies on this, too.
	 *
	 * ANALYZE (without VACUUM) can run either way.
	 */
	if (options & VACOPT_VACUUM)
	{
		PreventTransactionChain(isTopLevel, stmttype);
		in_outer_xact = false;
	}
	else
		in_outer_xact = IsInTransactionChain(isTopLevel);

	/*
	 * Due to static variables vac_context, anl_context and vac_strategy,
	 * vacuum() is not reentrant.  This matters when VACUUM FULL or ANALYZE
	 * calls a hostile index expression that itself calls ANALYZE.
	 */
	if (in_vacuum)
		elog(ERROR, "%s cannot be executed from VACUUM or ANALYZE", stmttype);

	/*
	 * Send info about dead objects to the statistics collector, unless we are
	 * in autovacuum --- autovacuum.c does this for itself.
	 */
	if ((options & VACOPT_VACUUM) && !IsAutoVacuumWorkerProcess())
		pgstat_vacuum_stat();

	/*
	 * Create special memory context for cross-transaction storage.
	 *
	 * Since it is a child of PortalContext, it will go away eventually even
	 * if we suffer an error; there's no need for special abort cleanup logic.
	 */
	vac_context = AllocSetContextCreate(PortalContext,
										"Vacuum",
										ALLOCSET_DEFAULT_MINSIZE,
										ALLOCSET_DEFAULT_INITSIZE,
										ALLOCSET_DEFAULT_MAXSIZE);

	/*
	 * If caller didn't give us a buffer strategy object, make one in the
	 * cross-transaction memory context.
	 */
	if (bstrategy == NULL)
	{
		MemoryContext old_context = MemoryContextSwitchTo(vac_context);

		bstrategy = GetAccessStrategy(BAS_VACUUM);
		MemoryContextSwitchTo(old_context);
	}
	vac_strategy = bstrategy;

	/*
	 * Build list of relations to process, unless caller gave us one. (If we
	 * build one, we put it in vac_context for safekeeping.)
	 */
	relations = get_rel_oids(relid, relation);

	/*
	 * Decide whether we need to start/commit our own transactions.
	 *
	 * For VACUUM (with or without ANALYZE): always do so, so that we can
	 * release locks as soon as possible.  (We could possibly use the outer
	 * transaction for a one-table VACUUM, but handling TOAST tables would be
	 * problematic.)
	 *
	 * For ANALYZE (no VACUUM): if inside a transaction block, we cannot
	 * start/commit our own transactions.  Also, there's no need to do so if
	 * only processing one relation.  For multiple relations when not within a
	 * transaction block, and also in an autovacuum worker, use own
	 * transactions so we can release locks sooner.
	 */
	if (options & VACOPT_VACUUM)
		use_own_xacts = true;
	else
	{
		Assert(options & VACOPT_ANALYZE);
		if (IsAutoVacuumWorkerProcess())
			use_own_xacts = true;
		else if (in_outer_xact)
			use_own_xacts = false;
		else if (list_length(relations) > 1)
			use_own_xacts = true;
		else
			use_own_xacts = false;
	}

	/*
	 * vacuum_rel expects to be entered with no transaction active; it will
	 * start and commit its own transaction.  But we are called by an SQL
	 * command, and so we are executing inside a transaction already. We
	 * commit the transaction started in PostgresMain() here, and start
	 * another one before exiting to match the commit waiting for us back in
	 * PostgresMain().
	 */
	if (use_own_xacts)
	{
		Assert(!in_outer_xact);

		/* ActiveSnapshot is not set by autovacuum */
		if (ActiveSnapshotSet())
			PopActiveSnapshot();

		/* matches the StartTransaction in PostgresMain() */
		CommitTransactionCommand();
	}

	/* Turn vacuum cost accounting on or off */
	PG_TRY();
	{
		ListCell   *cur;

		in_vacuum = true;
		VacuumCostActive = (VacuumCostDelay > 0);
		VacuumCostBalance = 0;
		VacuumPageHit = 0;
		VacuumPageMiss = 0;
		VacuumPageDirty = 0;

		/*
		 * Loop to process each selected relation.
		 */
		foreach(cur, relations)
		{
			Oid			relid = lfirst_oid(cur);

			if (options & VACOPT_VACUUM)
			{
				if (!vacuum_rel(relid, relation, options, params))
					continue;
			}

			if (options & VACOPT_ANALYZE)
			{
				/*
				 * If using separate xacts, start one for analyze. Otherwise,
				 * we can use the outer transaction.
				 */
				if (use_own_xacts)
				{
					StartTransactionCommand();
					/* functions in indexes may want a snapshot set */
					PushActiveSnapshot(GetTransactionSnapshot());
				}

				analyze_rel(relid, relation, options, params,
							va_cols, in_outer_xact, vac_strategy);

				if (use_own_xacts)
				{
					PopActiveSnapshot();
					CommitTransactionCommand();
				}
			}
		}
	}
	PG_CATCH();
	{
		in_vacuum = false;
		VacuumCostActive = false;
		PG_RE_THROW();
	}
	PG_END_TRY();

	in_vacuum = false;
	VacuumCostActive = false;

	/*
	 * Finish up processing.
	 */
	if (use_own_xacts)
	{
		/* here, we are not in a transaction */

		/*
		 * This matches the CommitTransaction waiting for us in
		 * PostgresMain().
		 */
		StartTransactionCommand();
	}

	if ((options & VACOPT_VACUUM) && !IsAutoVacuumWorkerProcess())
	{
		/*
		 * Update pg_database.datfrozenxid, and truncate pg_clog if possible.
		 * (autovacuum.c does this for itself.)
		 */
		vac_update_datfrozenxid();
	}

	/*
	 * Clean up working storage --- note we must do this after
	 * StartTransactionCommand, else we might be trying to delete the active
	 * context!
	 */
	MemoryContextDelete(vac_context);
	vac_context = NULL;
  }
/* prepare(query="select * from foo")
 * prepare(query="select * from foo where bar = $1", params=["text"])
 * prepare(query="select * from foo where bar = $1", params=["text"], limit=5)
 */
PyObject *
PLy_spi_prepare(PyObject *self, PyObject *args)
{
	PLyPlanObject *plan;
	PyObject   *list = NULL;
	PyObject   *volatile optr = NULL;
	char	   *query;
	volatile MemoryContext oldcontext;
	volatile ResourceOwner oldowner;
	volatile int nargs;

	if (!PyArg_ParseTuple(args, "s|O", &query, &list))
		return NULL;

	if (list && (!PySequence_Check(list)))
	{
		PLy_exception_set(PyExc_TypeError,
					   "second argument of plpy.prepare must be a sequence");
		return NULL;
	}

	if ((plan = (PLyPlanObject *) PLy_plan_new()) == NULL)
		return NULL;

	plan->mcxt = AllocSetContextCreate(TopMemoryContext,
									   "PL/Python plan context",
									   ALLOCSET_DEFAULT_SIZES);
	oldcontext = MemoryContextSwitchTo(plan->mcxt);

	nargs = list ? PySequence_Length(list) : 0;

	plan->nargs = nargs;
	plan->types = nargs ? palloc(sizeof(Oid) * nargs) : NULL;
	plan->values = nargs ? palloc(sizeof(Datum) * nargs) : NULL;
	plan->args = nargs ? palloc(sizeof(PLyTypeInfo) * nargs) : NULL;

	MemoryContextSwitchTo(oldcontext);

	oldcontext = CurrentMemoryContext;
	oldowner = CurrentResourceOwner;

	PLy_spi_subtransaction_begin(oldcontext, oldowner);

	PG_TRY();
	{
		int			i;
		PLyExecutionContext *exec_ctx = PLy_current_execution_context();

		/*
		 * the other loop might throw an exception, if PLyTypeInfo member
		 * isn't properly initialized the Py_DECREF(plan) will go boom
		 */
		for (i = 0; i < nargs; i++)
		{
			PLy_typeinfo_init(&plan->args[i], plan->mcxt);
			plan->values[i] = PointerGetDatum(NULL);
		}

		for (i = 0; i < nargs; i++)
		{
			char	   *sptr;
			HeapTuple	typeTup;
			Oid			typeId;
			int32		typmod;

			optr = PySequence_GetItem(list, i);
			if (PyString_Check(optr))
				sptr = PyString_AsString(optr);
			else if (PyUnicode_Check(optr))
				sptr = PLyUnicode_AsString(optr);
			else
			{
				ereport(ERROR,
						(errmsg("plpy.prepare: type name at ordinal position %d is not a string", i)));
				sptr = NULL;	/* keep compiler quiet */
			}

			/********************************************************
			 * Resolve argument type names and then look them up by
			 * oid in the system cache, and remember the required
			 *information for input conversion.
			 ********************************************************/

			parseTypeString(sptr, &typeId, &typmod, false);

			typeTup = SearchSysCache1(TYPEOID,
									  ObjectIdGetDatum(typeId));
			if (!HeapTupleIsValid(typeTup))
				elog(ERROR, "cache lookup failed for type %u", typeId);

			Py_DECREF(optr);

			/*
			 * set optr to NULL, so we won't try to unref it again in case of
			 * an error
			 */
			optr = NULL;

			plan->types[i] = typeId;
			PLy_output_datum_func(&plan->args[i], typeTup, exec_ctx->curr_proc->langid, exec_ctx->curr_proc->trftypes);
			ReleaseSysCache(typeTup);
		}

		pg_verifymbstr(query, strlen(query), false);
		plan->plan = SPI_prepare(query, plan->nargs, plan->types);
		if (plan->plan == NULL)
			elog(ERROR, "SPI_prepare failed: %s",
				 SPI_result_code_string(SPI_result));

		/* transfer plan from procCxt to topCxt */
		if (SPI_keepplan(plan->plan))
			elog(ERROR, "SPI_keepplan failed");

		PLy_spi_subtransaction_commit(oldcontext, oldowner);
	}
	PG_CATCH();
	{
		Py_DECREF(plan);
		Py_XDECREF(optr);

		PLy_spi_subtransaction_abort(oldcontext, oldowner);
		return NULL;
	}
	PG_END_TRY();

	Assert(plan->plan != NULL);
	return (PyObject *) plan;
}
static PyObject *
PLy_spi_execute_fetch_result(SPITupleTable *tuptable, uint64 rows, int status)
{
	PLyResultObject *result;
	volatile MemoryContext oldcontext;

	result = (PLyResultObject *) PLy_result_new();
	Py_DECREF(result->status);
	result->status = PyInt_FromLong(status);

	if (status > 0 && tuptable == NULL)
	{
		Py_DECREF(result->nrows);
		result->nrows = (rows > (uint64) LONG_MAX) ?
			PyFloat_FromDouble((double) rows) :
			PyInt_FromLong((long) rows);
	}
	else if (status > 0 && tuptable != NULL)
	{
		PLyTypeInfo args;
		MemoryContext cxt;

		Py_DECREF(result->nrows);
		result->nrows = (rows > (uint64) LONG_MAX) ?
			PyFloat_FromDouble((double) rows) :
			PyInt_FromLong((long) rows);

		cxt = AllocSetContextCreate(CurrentMemoryContext,
									"PL/Python temp context",
									ALLOCSET_DEFAULT_SIZES);
		PLy_typeinfo_init(&args, cxt);

		oldcontext = CurrentMemoryContext;
		PG_TRY();
		{
			MemoryContext oldcontext2;

			if (rows)
			{
				uint64		i;

				/*
				 * PyList_New() and PyList_SetItem() use Py_ssize_t for list
				 * size and list indices; so we cannot support a result larger
				 * than PY_SSIZE_T_MAX.
				 */
				if (rows > (uint64) PY_SSIZE_T_MAX)
					ereport(ERROR,
							(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
							 errmsg("query result has too many rows to fit in a Python list")));

				Py_DECREF(result->rows);
				result->rows = PyList_New(rows);

				PLy_input_tuple_funcs(&args, tuptable->tupdesc);
				for (i = 0; i < rows; i++)
				{
					PyObject   *row = PLyDict_FromTuple(&args,
														tuptable->vals[i],
														tuptable->tupdesc);

					PyList_SetItem(result->rows, i, row);
				}
			}

			/*
			 * Save tuple descriptor for later use by result set metadata
			 * functions.  Save it in TopMemoryContext so that it survives
			 * outside of an SPI context.  We trust that PLy_result_dealloc()
			 * will clean it up when the time is right.  (Do this as late as
			 * possible, to minimize the number of ways the tupdesc could get
			 * leaked due to errors.)
			 */
			oldcontext2 = MemoryContextSwitchTo(TopMemoryContext);
			result->tupdesc = CreateTupleDescCopy(tuptable->tupdesc);
			MemoryContextSwitchTo(oldcontext2);
		}
		PG_CATCH();
		{
			MemoryContextSwitchTo(oldcontext);
			MemoryContextDelete(cxt);
			Py_DECREF(result);
			PG_RE_THROW();
		}
		PG_END_TRY();

		MemoryContextDelete(cxt);
		SPI_freetuptable(tuptable);
	}

	return (PyObject *) result;
}
static PyObject *
PLy_spi_execute_plan(PyObject *ob, PyObject *list, long limit)
{
	volatile int nargs;
	int			i,
				rv;
	PLyPlanObject *plan;
	volatile MemoryContext oldcontext;
	volatile ResourceOwner oldowner;
	PyObject   *ret;

	if (list != NULL)
	{
		if (!PySequence_Check(list) || PyString_Check(list) || PyUnicode_Check(list))
		{
			PLy_exception_set(PyExc_TypeError, "plpy.execute takes a sequence as its second argument");
			return NULL;
		}
		nargs = PySequence_Length(list);
	}
	else
		nargs = 0;

	plan = (PLyPlanObject *) ob;

	if (nargs != plan->nargs)
	{
		char	   *sv;
		PyObject   *so = PyObject_Str(list);

		if (!so)
			PLy_elog(ERROR, "could not execute plan");
		sv = PyString_AsString(so);
		PLy_exception_set_plural(PyExc_TypeError,
							  "Expected sequence of %d argument, got %d: %s",
							 "Expected sequence of %d arguments, got %d: %s",
								 plan->nargs,
								 plan->nargs, nargs, sv);
		Py_DECREF(so);

		return NULL;
	}

	oldcontext = CurrentMemoryContext;
	oldowner = CurrentResourceOwner;

	PLy_spi_subtransaction_begin(oldcontext, oldowner);

	PG_TRY();
	{
		PLyExecutionContext *exec_ctx = PLy_current_execution_context();
		char	   *volatile nulls;
		volatile int j;

		if (nargs > 0)
			nulls = palloc(nargs * sizeof(char));
		else
			nulls = NULL;

		for (j = 0; j < nargs; j++)
		{
			PyObject   *elem;

			elem = PySequence_GetItem(list, j);
			if (elem != Py_None)
			{
				PG_TRY();
				{
					plan->values[j] =
						plan->args[j].out.d.func(&(plan->args[j].out.d),
												 -1,
												 elem);
				}
				PG_CATCH();
				{
					Py_DECREF(elem);
					PG_RE_THROW();
				}
				PG_END_TRY();

				Py_DECREF(elem);
				nulls[j] = ' ';
			}
			else
			{
				Py_DECREF(elem);
				plan->values[j] =
					InputFunctionCall(&(plan->args[j].out.d.typfunc),
									  NULL,
									  plan->args[j].out.d.typioparam,
									  -1);
				nulls[j] = 'n';
			}
		}

		rv = SPI_execute_plan(plan->plan, plan->values, nulls,
							  exec_ctx->curr_proc->fn_readonly, limit);
		ret = PLy_spi_execute_fetch_result(SPI_tuptable, SPI_processed, rv);

		if (nargs > 0)
			pfree(nulls);

		PLy_spi_subtransaction_commit(oldcontext, oldowner);
	}
	PG_CATCH();
	{
		int			k;

		/*
		 * cleanup plan->values array
		 */
		for (k = 0; k < nargs; k++)
		{
			if (!plan->args[k].out.d.typbyval &&
				(plan->values[k] != PointerGetDatum(NULL)))
			{
				pfree(DatumGetPointer(plan->values[k]));
				plan->values[k] = PointerGetDatum(NULL);
			}
		}

		PLy_spi_subtransaction_abort(oldcontext, oldowner);
		return NULL;
	}
	PG_END_TRY();

	for (i = 0; i < nargs; i++)
	{
		if (!plan->args[i].out.d.typbyval &&
			(plan->values[i] != PointerGetDatum(NULL)))
		{
			pfree(DatumGetPointer(plan->values[i]));
			plan->values[i] = PointerGetDatum(NULL);
		}
	}

	if (rv < 0)
	{
		PLy_exception_set(PLy_exc_spi_error,
						  "SPI_execute_plan failed: %s",
						  SPI_result_code_string(rv));
		return NULL;
	}

	return ret;
}
Beispiel #14
0
/*
 * PersistHoldablePortal
 *
 * Prepare the specified Portal for access outside of the current
 * transaction. When this function returns, all future accesses to the
 * portal must be done via the Tuplestore (not by invoking the
 * executor).
 */
void
PersistHoldablePortal(Portal portal)
{
	QueryDesc  *queryDesc = PortalGetQueryDesc(portal);
	Portal		saveActivePortal;
	ResourceOwner saveResourceOwner;
	MemoryContext savePortalContext;
	MemoryContext oldcxt;

	/*
	 * If we're preserving a holdable portal, we had better be inside the
	 * transaction that originally created it.
	 */
	Assert(portal->createSubid != InvalidSubTransactionId);
	Assert(queryDesc != NULL);

	/*
	 * Caller must have created the tuplestore already ... but not a snapshot.
	 */
	Assert(portal->holdContext != NULL);
	Assert(portal->holdStore != NULL);
	Assert(portal->holdSnapshot == NULL);

	/*
	 * Before closing down the executor, we must copy the tupdesc into
	 * long-term memory, since it was created in executor memory.
	 */
	oldcxt = MemoryContextSwitchTo(portal->holdContext);

	portal->tupDesc = CreateTupleDescCopy(portal->tupDesc);

	MemoryContextSwitchTo(oldcxt);

	/*
	 * Check for improper portal use, and mark portal active.
	 */
	MarkPortalActive(portal);

	/*
	 * Set up global portal context pointers.
	 */
	saveActivePortal = ActivePortal;
	saveResourceOwner = CurrentResourceOwner;
	savePortalContext = PortalContext;
	PG_TRY();
	{
		ActivePortal = portal;
		if (portal->resowner)
			CurrentResourceOwner = portal->resowner;
		PortalContext = PortalGetHeapMemory(portal);

		MemoryContextSwitchTo(PortalContext);

		PushActiveSnapshot(queryDesc->snapshot);

		/*
		 * Rewind the executor: we need to store the entire result set in the
		 * tuplestore, so that subsequent backward FETCHs can be processed.
		 */
		ExecutorRewind(queryDesc);

		/*
		 * Change the destination to output to the tuplestore.  Note we tell
		 * the tuplestore receiver to detoast all data passed through it; this
		 * makes it safe to not keep a snapshot associated with the data.
		 */
		queryDesc->dest = CreateDestReceiver(DestTuplestore);
		SetTuplestoreDestReceiverParams(queryDesc->dest,
										portal->holdStore,
										portal->holdContext,
										true);

		/* Fetch the result set into the tuplestore */
		ExecutorRun(queryDesc, ForwardScanDirection, 0L, false);

		(*queryDesc->dest->rDestroy) (queryDesc->dest);
		queryDesc->dest = NULL;

		/*
		 * Now shut down the inner executor.
		 */
		portal->queryDesc = NULL;		/* prevent double shutdown */
		ExecutorFinish(queryDesc);
		ExecutorEnd(queryDesc);
		FreeQueryDesc(queryDesc);

		/*
		 * Set the position in the result set.
		 */
		MemoryContextSwitchTo(portal->holdContext);

		if (portal->atEnd)
		{
			/*
			 * Just force the tuplestore forward to its end.  The size of the
			 * skip request here is arbitrary.
			 */
			while (tuplestore_skiptuples(portal->holdStore, 1000000, true))
				 /* continue */ ;
		}
		else
		{
			tuplestore_rescan(portal->holdStore);

			if (!tuplestore_skiptuples(portal->holdStore,
									   portal->portalPos,
									   true))
				elog(ERROR, "unexpected end of tuple stream");
		}
	}
	PG_CATCH();
	{
		/* Uncaught error while executing portal: mark it dead */
		MarkPortalFailed(portal);

		/* Restore global vars and propagate error */
		ActivePortal = saveActivePortal;
		CurrentResourceOwner = saveResourceOwner;
		PortalContext = savePortalContext;

		PG_RE_THROW();
	}
	PG_END_TRY();

	MemoryContextSwitchTo(oldcxt);

	/* Mark portal not active */
	portal->status = PORTAL_READY;

	ActivePortal = saveActivePortal;
	CurrentResourceOwner = saveResourceOwner;
	PortalContext = savePortalContext;

	PopActiveSnapshot();

	/*
	 * We can now release any subsidiary memory of the portal's heap context;
	 * we'll never use it again.  The executor already dropped its context,
	 * but this will clean up anything that glommed onto the portal's heap via
	 * PortalContext.
	 */
	MemoryContextDeleteChildren(PortalGetHeapMemory(portal));
}
Beispiel #15
0
static int64
get_size_from_segDBs(const char * cmd)
{
	int			spiresult;
	bool		succeeded = false;
	int64		result = 0;
	volatile bool connected = false;

	Assert(Gp_role == GP_ROLE_DISPATCH);

	PG_TRY();
	{
		HeapTuple	tup;
		TupleDesc	tupdesc;
		bool		isnull;
		Datum		size;

		do
		{
			/* Establish an SPI session as a client of myself. */
			if (SPI_connect() != SPI_OK_CONNECT)
				break;

			connected = true;

			/* Do the query. */
			spiresult = SPI_execute(cmd, false, 0);

			/* Did the query succeed? */
			if (spiresult != SPI_OK_SELECT)
				break;

			if (SPI_processed < 1)
				break;

			tup = SPI_tuptable->vals[0];
			tupdesc = SPI_tuptable->tupdesc;

			size = heap_getattr(SPI_tuptable->vals[0], 1, SPI_tuptable->tupdesc, &isnull);
			if (isnull)
				break;

			result = DatumGetInt64(size);

			succeeded = true;
		}
		while (0);

		/* End recursive session. */
		connected = false;
		SPI_finish();

		if (!succeeded)
			elog(ERROR, "Unable to get sizes from segments");
	}
	/* Clean up in case of error. */
	PG_CATCH();
	{
		/* End recursive session. */
		if (connected)
			SPI_finish();

		/* Carry on with error handling. */
		PG_RE_THROW();
	}
	PG_END_TRY();

	return result;
}
Beispiel #16
0
/*
 * ExecWorkFile_Write
 *    write the given data from the end of the last write position.
 *
 * This function returns true if the write succeeds. Otherwise, return false.
 */
bool
ExecWorkFile_Write(ExecWorkFile *workfile,
				   void *data,
				   uint64 size)
{
	Assert(workfile != NULL);
	uint64 bytes;

	if (data == NULL || size == 0)
	{
		return false;
	}

	/* Test the per-query and per-segment limit */
	if ((workfile->flags & EXEC_WORKFILE_LIMIT_SIZE) &&
			!WorkfileDiskspace_Reserve(size))
	{
		/* Failed to reserve additional disk space, notify caller */
		workfile_mgr_report_error();
	}

	switch(workfile->fileType)
	{
		case BUFFILE:
			{}
			BufFile *buffile = (BufFile *)workfile->file;

			int64 current_size = BufFileGetSize(buffile);
			int64 new_size = 0;

			PG_TRY();
			{
				bytes = BufFileWrite(buffile, data, size);
			}
			PG_CATCH();
			{
				new_size = BufFileGetSize(buffile);
				workfile->size = new_size;
				WorkfileDiskspace_Commit( (new_size - current_size), size, true /* update_query_size */);

				PG_RE_THROW();
			}
			PG_END_TRY();

			new_size = BufFileGetSize(buffile);
			workfile->size = new_size;

			WorkfileDiskspace_Commit( (new_size - current_size), size, true /* update_query_size */);
			workfile_update_in_progress_size(workfile, new_size - current_size);

			if (bytes != size)
			{
				workfile_mgr_report_error();
			}

			break;
		case BFZ:

			PG_TRY();
			{
				bfz_append((bfz_t *)workfile->file, data, size);
			}
			PG_CATCH();
			{
				Assert(WorkfileDiskspace_IsFull());
				WorkfileDiskspace_Commit(0, size, true /* update_query_size */);

				PG_RE_THROW();
			}
			PG_END_TRY();

			/* bfz_append always adds to the file size */
			workfile->size += size;
			if ((workfile->flags & EXEC_WORKFILE_LIMIT_SIZE))
			{
				WorkfileDiskspace_Commit(size, size, true /* update_query_size */);
			}
			workfile_update_in_progress_size(workfile, size);

			break;
		default:
			insist_log(false, "invalid work file type: %d", workfile->fileType);
	}

	return true;
}
Beispiel #17
0
/*
 * lo_export -
 *	  exports an (inversion) large object.
 */
static pg_attribute_unused() Datum
lo_export_pg(PG_FUNCTION_ARGS)
{
	Oid			lobjId = PG_GETARG_OID(0);
	text	   *filename = PG_GETARG_TEXT_PP(1);
	int			fd;
	int			nbytes,
				tmp;
	char		buf[BUFSIZE];
	char		fnamebuf[MAXPGPATH];
	LargeObjectDesc *lobj;
	mode_t		oumask;

#ifndef ALLOW_DANGEROUS_LO_FUNCTIONS
	if (!superuser())
		ereport(ERROR,
				(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
				 errmsg("must be superuser to use server-side lo_export()"),
				 errhint("Anyone can use the client-side lo_export() provided by libpq.")));
#endif

	CreateFSContext();

	/*
	 * open the inversion object (no need to test for failure)
	 */
	lobj = inv_open(lobjId, INV_READ, fscxt);

	/*
	 * open the file to be written to
	 *
	 * Note: we reduce backend's normal 077 umask to the slightly friendlier
	 * 022. This code used to drop it all the way to 0, but creating
	 * world-writable export files doesn't seem wise.
	 */
	text_to_cstring_buffer(filename, fnamebuf, sizeof(fnamebuf));
	oumask = umask(S_IWGRP | S_IWOTH);
	PG_TRY();
	{
		fd = OpenTransientFile(fnamebuf, O_CREAT | O_WRONLY | O_TRUNC | PG_BINARY,
							   S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
	}
	PG_CATCH();
	{
		umask(oumask);
		PG_RE_THROW();
	}
	PG_END_TRY();
	umask(oumask);
	if (fd < 0)
		ereport(ERROR,
				(errcode_for_file_access(),
				 errmsg("could not create server file \"%s\": %m",
						fnamebuf)));

	/*
	 * read in from the inversion file and write to the filesystem
	 */
	while ((nbytes = inv_read(lobj, buf, BUFSIZE)) > 0)
	{
		tmp = write(fd, buf, nbytes);
		if (tmp != nbytes)
			ereport(ERROR,
					(errcode_for_file_access(),
					 errmsg("could not write server file \"%s\": %m",
							fnamebuf)));
	}

	CloseTransientFile(fd);
	inv_close(lobj);

	PG_RETURN_INT32(1);
}
Beispiel #18
0
static bool
ServiceClientRead(ServiceClient *serviceClient, void* response, int responseLen, struct timeval *timeout)
{
	ServiceConfig *serviceConfig;
	int		n;
	int	   bytesRead = 0;
	int			saved_err;
	char        *message;
	bool		result = false;
	mpp_fd_set	rset;
	struct timeval rundownTimeout = {0,0};
	// Use local variable since select modifies
	// the timeout parameter with remaining time.
	DECLARE_SAVE_SUPPRESS_PANIC();

	Assert(serviceClient != NULL);
	serviceConfig = serviceClient->serviceConfig;
	Assert(serviceConfig != NULL);
	Assert(response != NULL);
	if (timeout != NULL)
		rundownTimeout = *timeout;

	PG_TRY();
	{
		SUPPRESS_PANIC();

		/*
		 * read the response
		 */
		while (bytesRead < responseLen)
		{
			n = read(serviceClient->sockfd,
				     ((char *)response) + bytesRead,
				     responseLen - bytesRead);
			saved_err = errno;

			if (n == 0)
			{
				ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
								errmsg("Connection to '%s' is closed (%d)",
									   serviceConfig->title, serviceClient->sockfd)));
			}

			if (n < 0)
			{
				if (saved_err != EINTR && saved_err != EWOULDBLOCK)
				{
					ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
									errmsg("Read error from '%s': %s (%d)",
										   serviceConfig->title,
										   strerror(saved_err), serviceClient->sockfd)));
				}

				if (saved_err == EWOULDBLOCK)
				{
					/* we shouldn't really get here since we are dealing with
					 * small messages, but once we've read a bit of data we
					 * need to finish out reading till we get the message (or error)
					 */
					do
					{
						MPP_FD_ZERO(&rset);
						MPP_FD_SET(serviceClient->sockfd, &rset);
						n = select(serviceClient->sockfd + 1, (fd_set *)&rset, NULL, NULL, (timeout == NULL ? NULL : &rundownTimeout));
						if (n == 0)
						{
							if (timeout != NULL)
							{
								ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
												errmsg("Read from '%s' timed out after %d.%03d seconds",
													   serviceConfig->title,
													   (int)timeout->tv_sec,
													   (int)timeout->tv_usec / 1000)));
							}
						}
						else if (n < 0 && errno == EINTR)
							continue;
						else if (n < 0)
						{
							saved_err = errno;

							ereport(ERROR, (errcode(ERRCODE_GP_INTERCONNECTION_ERROR),
											errmsg("Read error from '%s': %s (%d)",
												   serviceConfig->title,
												   strerror(saved_err), serviceClient->sockfd)));
						}
					}
					while (n < 1);
				}
				/* else saved_err == EINTR */

				continue;
			}
			else
				bytesRead += n;
		}

		result = true;
		RESTORE_PANIC();
	}
	PG_CATCH();
	{
		RESTORE_PANIC();

		/* Report the error to the server log */
	    if (!elog_demote(WARNING))
    	{
    		elog(LOG,"unable to demote error");
        	PG_RE_THROW();
    	}

		message = elog_message();
 		if (message != NULL && strlen(message) + 1 < sizeof(ClientErrorString))
			strcpy(ClientErrorString, message);
		else
			strcpy(ClientErrorString, "");

		EmitErrorReport();
		FlushErrorState();

		result = false;
	}
	PG_END_TRY();

	return result;
}
Beispiel #19
0
/*
 * Helper function for the various SQL callable logical decoding functions.
 */
static Datum
pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool binary)
{
	Name		name;
	XLogRecPtr	upto_lsn;
	int32		upto_nchanges;
	ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
	MemoryContext per_query_ctx;
	MemoryContext oldcontext;
	XLogRecPtr	end_of_wal;
	XLogRecPtr	startptr;
	LogicalDecodingContext *ctx;
	ResourceOwner old_resowner = CurrentResourceOwner;
	ArrayType  *arr;
	Size		ndim;
	List	   *options = NIL;
	DecodingOutputState *p;

	check_permissions();

	CheckLogicalDecodingRequirements();

	if (PG_ARGISNULL(0))
		ereport(ERROR,
				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
				 errmsg("slot name must not be null")));
	name = PG_GETARG_NAME(0);

	if (PG_ARGISNULL(1))
		upto_lsn = InvalidXLogRecPtr;
	else
		upto_lsn = PG_GETARG_LSN(1);

	if (PG_ARGISNULL(2))
		upto_nchanges = InvalidXLogRecPtr;
	else
		upto_nchanges = PG_GETARG_INT32(2);

	if (PG_ARGISNULL(3))
		ereport(ERROR,
				(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
				 errmsg("options array must not be null")));
	arr = PG_GETARG_ARRAYTYPE_P(3);

	/* check to see if caller supports us returning a tuplestore */
	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("set-valued function called in context that cannot accept a set")));
	if (!(rsinfo->allowedModes & SFRM_Materialize))
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("materialize mode required, but it is not allowed in this context")));

	/* state to write output to */
	p = palloc0(sizeof(DecodingOutputState));

	p->binary_output = binary;

	/* Build a tuple descriptor for our result type */
	if (get_call_result_type(fcinfo, NULL, &p->tupdesc) != TYPEFUNC_COMPOSITE)
		elog(ERROR, "return type must be a row type");

	per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
	oldcontext = MemoryContextSwitchTo(per_query_ctx);

	/* Deconstruct options array */
	ndim = ARR_NDIM(arr);
	if (ndim > 1)
	{
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("array must be one-dimensional")));
	}
	else if (array_contains_nulls(arr))
	{
		ereport(ERROR,
				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
				 errmsg("array must not contain nulls")));
	}
	else if (ndim == 1)
	{
		int			nelems;
		Datum	   *datum_opts;
		int			i;

		Assert(ARR_ELEMTYPE(arr) == TEXTOID);

		deconstruct_array(arr, TEXTOID, -1, false, 'i',
						  &datum_opts, NULL, &nelems);

		if (nelems % 2 != 0)
			ereport(ERROR,
					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
					 errmsg("array must have even number of elements")));

		for (i = 0; i < nelems; i += 2)
		{
			char	   *name = TextDatumGetCString(datum_opts[i]);
			char	   *opt = TextDatumGetCString(datum_opts[i + 1]);

			options = lappend(options, makeDefElem(name, (Node *) makeString(opt)));
		}
	}

	p->tupstore = tuplestore_begin_heap(true, false, work_mem);
	rsinfo->returnMode = SFRM_Materialize;
	rsinfo->setResult = p->tupstore;
	rsinfo->setDesc = p->tupdesc;

	ReplicationSlotAcquire(NameStr(*name));

	PG_TRY();
	{
		/*
		 * Passing InvalidXLogRecPtr here causes replay to start at the slot's
		 * confirmed_flush.
		 */
		ctx = CreateDecodingContext(InvalidXLogRecPtr,
									options,
									logical_read_local_xlog_page,
									LogicalOutputPrepareWrite,
									LogicalOutputWrite);

		MemoryContextSwitchTo(oldcontext);

		/*
		 * Check whether the output plugin writes textual output if that's
		 * what we need.
		 */
		if (!binary &&
			ctx->options.output_type !=OUTPUT_PLUGIN_TEXTUAL_OUTPUT)
			ereport(ERROR,
					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
					 errmsg("logical decoding output plugin \"%s\" produces binary output, but function \"%s\" expects textual data",
							NameStr(MyReplicationSlot->data.plugin),
							format_procedure(fcinfo->flinfo->fn_oid))));

		ctx->output_writer_private = p;

		/*
		 * We start reading xlog from the restart lsn, even though in
		 * CreateDecodingContext we set the snapshot builder up using the
		 * slot's confirmed_flush. This means we might read xlog we don't
		 * actually decode rows from, but the snapshot builder might need it
		 * to get to a consistent point. The point we start returning data to
		 * *users* at is the confirmed_flush lsn set up in the decoding
		 * context.
		 */
		startptr = MyReplicationSlot->data.restart_lsn;

		CurrentResourceOwner = ResourceOwnerCreate(CurrentResourceOwner, "logical decoding");

		/* invalidate non-timetravel entries */
		InvalidateSystemCaches();

		if (!RecoveryInProgress())
			end_of_wal = GetFlushRecPtr();
		else
			end_of_wal = GetXLogReplayRecPtr(NULL);

		/* Decode until we run out of records */
		while ((startptr != InvalidXLogRecPtr && startptr < end_of_wal) ||
			   (ctx->reader->EndRecPtr != InvalidXLogRecPtr && ctx->reader->EndRecPtr < end_of_wal))
		{
			XLogRecord *record;
			char	   *errm = NULL;

			record = XLogReadRecord(ctx->reader, startptr, &errm);
			if (errm)
				elog(ERROR, "%s", errm);

			/*
			 * Now that we've set up the xlog reader state, subsequent calls
			 * pass InvalidXLogRecPtr to say "continue from last record"
			 */
			startptr = InvalidXLogRecPtr;

			/*
			 * The {begin_txn,change,commit_txn}_wrapper callbacks above will
			 * store the description into our tuplestore.
			 */
			if (record != NULL)
				LogicalDecodingProcessRecord(ctx, ctx->reader);

			/* check limits */
			if (upto_lsn != InvalidXLogRecPtr &&
				upto_lsn <= ctx->reader->EndRecPtr)
				break;
			if (upto_nchanges != 0 &&
				upto_nchanges <= p->returned_rows)
				break;
			CHECK_FOR_INTERRUPTS();
		}

		tuplestore_donestoring(tupstore);

		CurrentResourceOwner = old_resowner;

		/*
		 * Next time, start where we left off. (Hunting things, the family
		 * business..)
		 */
		if (ctx->reader->EndRecPtr != InvalidXLogRecPtr && confirm)
			LogicalConfirmReceivedLocation(ctx->reader->EndRecPtr);

		/* free context, call shutdown callback */
		FreeDecodingContext(ctx);

		ReplicationSlotRelease();
		InvalidateSystemCaches();
	}
	PG_CATCH();
	{
		/* clear all timetravel entries */
		InvalidateSystemCaches();

		PG_RE_THROW();
	}
	PG_END_TRY();

	return (Datum) 0;
}
Beispiel #20
0
static text*
_nls_run_strxfrm(text *string, text *locale)
{
	char *string_str;
	int string_len;

	char *locale_str = NULL;
	int locale_len = 0;

	text *result;
	char *tmp = NULL;
	size_t size = 0;
	size_t rest = 0;
	int changed_locale = 0;

	/*
	 * Save the default, server-wide locale setting.
	 * It should not change during the life-span of the server so it
	 * is safe to save it only once, during the first invocation.
	 */
	if (!lc_collate_cache)
	{
		if ((lc_collate_cache = setlocale(LC_COLLATE, NULL)))
			/* Make a copy of the locale name string. */
			lc_collate_cache = strdup(lc_collate_cache);
		if (!lc_collate_cache)
			elog(ERROR, "failed to retrieve the default LC_COLLATE value");
	}

	/*
	 * To run strxfrm, we need a zero-terminated strings.
	 */
	string_len = VARSIZE_ANY_EXHDR(string);
	if (string_len < 0)
		return NULL;
	string_str = palloc(string_len + 1);
	memcpy(string_str, VARDATA_ANY(string), string_len);

	*(string_str + string_len) = '\0';

	if (locale)
	{
		locale_len = VARSIZE_ANY_EXHDR(locale);
	}

	/*
	 * If different than default locale is requested, call setlocale.
	 */
	if (locale_len > 0
		&& (strncmp(lc_collate_cache, VARDATA_ANY(locale), locale_len)
			|| *(lc_collate_cache + locale_len) != '\0'))
	{
		locale_str = palloc(locale_len + 1);
		memcpy(locale_str, VARDATA_ANY(locale), locale_len);
		*(locale_str + locale_len) = '\0';

		/*
		 * Try to set correct locales.
		 * If setlocale failed, we know the default stayed the same,
		 * co we can safely elog.
		 */
		if (!setlocale(LC_COLLATE, locale_str))
			elog(ERROR, "failed to set the requested LC_COLLATE value [%s]", locale_str);

		changed_locale = 1;
	}

	/*
	 * We do TRY / CATCH / END_TRY to catch ereport / elog that might
	 * happen during palloc. Ereport during palloc would not be
	 * nice since it would leave the server with changed locales
	 * setting, resulting in bad things.
	 */
	PG_TRY();
	{

		/*
		 * Text transformation.
		 * Increase the buffer until the strxfrm is able to fit.
		 */
		size = string_len * multiplication + 1;
		tmp = palloc(size + VARHDRSZ);

		rest = strxfrm(tmp + VARHDRSZ, string_str, size);
		while (rest >= size)
		{
			pfree(tmp);
			size = rest + 1;
			tmp = palloc(size + VARHDRSZ);
			rest = strxfrm(tmp + VARHDRSZ, string_str, size);
			/*
			 * Cache the multiplication factor so that the next
			 * time we start with better value.
			 */
			if (string_len)
				multiplication = (rest / string_len) + 2;
		}
	}
	PG_CATCH ();
	{
		if (changed_locale) {
			/*
			 * Set original locale
			 */
			if (!setlocale(LC_COLLATE, lc_collate_cache))
				elog(FATAL, "failed to set back the default LC_COLLATE value [%s]", lc_collate_cache);
		}
	}
	PG_END_TRY ();

	if (changed_locale)
	{
		/*
		 * Set original locale
		 */
		if (!setlocale(LC_COLLATE, lc_collate_cache))
			elog(FATAL, "failed to set back the default LC_COLLATE value [%s]", lc_collate_cache);
		pfree(locale_str);
	}
	pfree(string_str);

	/*
	 * If the multiplication factor went down, reset it.
	 */
	if (string_len && rest < string_len * multiplication / 4)
		multiplication = (rest / string_len) + 1;

	result = (text *) tmp;
	SET_VARSIZE(result, rest + VARHDRSZ);
	return result;
}
Beispiel #21
0
Datum
plpython_call_handler(PG_FUNCTION_ARGS)
{
	Datum		retval;
	PLyExecutionContext *exec_ctx;
	ErrorContextCallback plerrcontext;

	PLy_initialize();

	/* Note: SPI_finish() happens in plpy_exec.c, which is dubious design */
	if (SPI_connect() != SPI_OK_CONNECT)
		elog(ERROR, "SPI_connect failed");

	/*
	 * Push execution context onto stack.  It is important that this get
	 * popped again, so avoid putting anything that could throw error between
	 * here and the PG_TRY.
	 */
	exec_ctx = PLy_push_execution_context();

	PG_TRY();
	{
		Oid			funcoid = fcinfo->flinfo->fn_oid;
		PLyProcedure *proc;

		/*
		 * Setup error traceback support for ereport().  Note that the PG_TRY
		 * structure pops this for us again at exit, so we needn't do that
		 * explicitly, nor do we risk the callback getting called after we've
		 * destroyed the exec_ctx.
		 */
		plerrcontext.callback = plpython_error_callback;
		plerrcontext.arg = exec_ctx;
		plerrcontext.previous = error_context_stack;
		error_context_stack = &plerrcontext;

		if (CALLED_AS_TRIGGER(fcinfo))
		{
			Relation	tgrel = ((TriggerData *) fcinfo->context)->tg_relation;
			HeapTuple	trv;

			proc = PLy_procedure_get(funcoid, RelationGetRelid(tgrel), true);
			exec_ctx->curr_proc = proc;
			trv = PLy_exec_trigger(fcinfo, proc);
			retval = PointerGetDatum(trv);
		}
		else
		{
			proc = PLy_procedure_get(funcoid, InvalidOid, false);
			exec_ctx->curr_proc = proc;
			retval = PLy_exec_function(fcinfo, proc);
		}
	}
	PG_CATCH();
	{
		PLy_pop_execution_context();
		PyErr_Clear();
		PG_RE_THROW();
	}
	PG_END_TRY();

	/* Destroy the execution context */
	PLy_pop_execution_context();

	return retval;
}
Beispiel #22
0
static PyObject *
PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc)
{
	PyObject   *volatile arg = NULL;
	PyObject   *volatile args = NULL;
	int			i;

	PG_TRY();
	{
		args = PyList_New(proc->nargs);
		for (i = 0; i < proc->nargs; i++)
		{
			if (proc->args[i].is_rowtype > 0)
			{
				if (fcinfo->argnull[i])
					arg = NULL;
				else
				{
					HeapTupleHeader td;
					Oid			tupType;
					int32		tupTypmod;
					TupleDesc	tupdesc;
					HeapTupleData tmptup;

					td = DatumGetHeapTupleHeader(fcinfo->arg[i]);
					/* Extract rowtype info and find a tupdesc */
					tupType = HeapTupleHeaderGetTypeId(td);
					tupTypmod = HeapTupleHeaderGetTypMod(td);
					tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);

					/* Set up I/O funcs if not done yet */
					if (proc->args[i].is_rowtype != 1)
						PLy_input_tuple_funcs(&(proc->args[i]), tupdesc);

					/* Build a temporary HeapTuple control structure */
					tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
					tmptup.t_data = td;

					arg = PLyDict_FromTuple(&(proc->args[i]), &tmptup, tupdesc);
					ReleaseTupleDesc(tupdesc);
				}
			}
			else
			{
				if (fcinfo->argnull[i])
					arg = NULL;
				else
				{
					arg = (proc->args[i].in.d.func) (&(proc->args[i].in.d),
													 fcinfo->arg[i]);
				}
			}

			if (arg == NULL)
			{
				Py_INCREF(Py_None);
				arg = Py_None;
			}

			if (PyList_SetItem(args, i, arg) == -1)
				PLy_elog(ERROR, "PyList_SetItem() failed, while setting up arguments");

			if (proc->argnames && proc->argnames[i] &&
			PyDict_SetItemString(proc->globals, proc->argnames[i], arg) == -1)
				PLy_elog(ERROR, "PyDict_SetItemString() failed, while setting up arguments");
			arg = NULL;
		}

		/* Set up output conversion for functions returning RECORD */
		if (proc->result.out.d.typoid == RECORDOID)
		{
			TupleDesc	desc;

			if (get_call_result_type(fcinfo, NULL, &desc) != TYPEFUNC_COMPOSITE)
				ereport(ERROR,
						(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
						 errmsg("function returning record called in context "
								"that cannot accept type record")));

			/* cache the output conversion functions */
			PLy_output_record_funcs(&(proc->result), desc);
		}
	}
	PG_CATCH();
	{
		Py_XDECREF(arg);
		Py_XDECREF(args);

		PG_RE_THROW();
	}
	PG_END_TRY();

	return args;
}
Beispiel #23
0
Datum
plpython_inline_handler(PG_FUNCTION_ARGS)
{
	InlineCodeBlock *codeblock = (InlineCodeBlock *) DatumGetPointer(PG_GETARG_DATUM(0));
	FunctionCallInfoData fake_fcinfo;
	FmgrInfo	flinfo;
	PLyProcedure proc;
	PLyExecutionContext *exec_ctx;
	ErrorContextCallback plerrcontext;

	PLy_initialize();

	/* Note: SPI_finish() happens in plpy_exec.c, which is dubious design */
	if (SPI_connect() != SPI_OK_CONNECT)
		elog(ERROR, "SPI_connect failed");

	MemSet(&fake_fcinfo, 0, sizeof(fake_fcinfo));
	MemSet(&flinfo, 0, sizeof(flinfo));
	fake_fcinfo.flinfo = &flinfo;
	flinfo.fn_oid = InvalidOid;
	flinfo.fn_mcxt = CurrentMemoryContext;

	MemSet(&proc, 0, sizeof(PLyProcedure));
	proc.pyname = PLy_strdup("__plpython_inline_block");
	proc.result.out.d.typoid = VOIDOID;

	/*
	 * Push execution context onto stack.  It is important that this get
	 * popped again, so avoid putting anything that could throw error between
	 * here and the PG_TRY.
	 */
	exec_ctx = PLy_push_execution_context();

	PG_TRY();
	{
		/*
		 * Setup error traceback support for ereport().
		 * plpython_inline_error_callback doesn't currently need exec_ctx, but
		 * for consistency with plpython_call_handler we do it the same way.
		 */
		plerrcontext.callback = plpython_inline_error_callback;
		plerrcontext.arg = exec_ctx;
		plerrcontext.previous = error_context_stack;
		error_context_stack = &plerrcontext;

		PLy_procedure_compile(&proc, codeblock->source_text);
		exec_ctx->curr_proc = &proc;
		PLy_exec_function(&fake_fcinfo, &proc);
	}
	PG_CATCH();
	{
		PLy_pop_execution_context();
		PLy_procedure_delete(&proc);
		PyErr_Clear();
		PG_RE_THROW();
	}
	PG_END_TRY();

	/* Destroy the execution context */
	PLy_pop_execution_context();

	/* Now clean up the transient procedure we made */
	PLy_procedure_delete(&proc);

	PG_RETURN_VOID();
}
Beispiel #24
0
static PyObject *
PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *proc, HeapTuple *rv)
{
	TriggerData *tdata = (TriggerData *) fcinfo->context;
	PyObject   *pltname,
			   *pltevent,
			   *pltwhen,
			   *pltlevel,
			   *pltrelid,
			   *plttablename,
			   *plttableschema;
	PyObject   *pltargs,
			   *pytnew,
			   *pytold;
	PyObject   *volatile pltdata = NULL;
	char	   *stroid;

	PG_TRY();
	{
		pltdata = PyDict_New();
		if (!pltdata)
			PLy_elog(ERROR, "could not create new dictionary while building trigger arguments");

		pltname = PyString_FromString(tdata->tg_trigger->tgname);
		PyDict_SetItemString(pltdata, "name", pltname);
		Py_DECREF(pltname);

		stroid = DatumGetCString(DirectFunctionCall1(oidout,
							   ObjectIdGetDatum(tdata->tg_relation->rd_id)));
		pltrelid = PyString_FromString(stroid);
		PyDict_SetItemString(pltdata, "relid", pltrelid);
		Py_DECREF(pltrelid);
		pfree(stroid);

		stroid = SPI_getrelname(tdata->tg_relation);
		plttablename = PyString_FromString(stroid);
		PyDict_SetItemString(pltdata, "table_name", plttablename);
		Py_DECREF(plttablename);
		pfree(stroid);

		stroid = SPI_getnspname(tdata->tg_relation);
		plttableschema = PyString_FromString(stroid);
		PyDict_SetItemString(pltdata, "table_schema", plttableschema);
		Py_DECREF(plttableschema);
		pfree(stroid);

		if (TRIGGER_FIRED_BEFORE(tdata->tg_event))
			pltwhen = PyString_FromString("BEFORE");
		else if (TRIGGER_FIRED_AFTER(tdata->tg_event))
			pltwhen = PyString_FromString("AFTER");
		else if (TRIGGER_FIRED_INSTEAD(tdata->tg_event))
			pltwhen = PyString_FromString("INSTEAD OF");
		else
		{
			elog(ERROR, "unrecognized WHEN tg_event: %u", tdata->tg_event);
			pltwhen = NULL;		/* keep compiler quiet */
		}
		PyDict_SetItemString(pltdata, "when", pltwhen);
		Py_DECREF(pltwhen);

		if (TRIGGER_FIRED_FOR_ROW(tdata->tg_event))
		{
			pltlevel = PyString_FromString("ROW");
			PyDict_SetItemString(pltdata, "level", pltlevel);
			Py_DECREF(pltlevel);

			if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event))
			{
				pltevent = PyString_FromString("INSERT");

				PyDict_SetItemString(pltdata, "old", Py_None);
				pytnew = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple,
										   tdata->tg_relation->rd_att);
				PyDict_SetItemString(pltdata, "new", pytnew);
				Py_DECREF(pytnew);
				*rv = tdata->tg_trigtuple;
			}
			else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event))
			{
				pltevent = PyString_FromString("DELETE");

				PyDict_SetItemString(pltdata, "new", Py_None);
				pytold = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple,
										   tdata->tg_relation->rd_att);
				PyDict_SetItemString(pltdata, "old", pytold);
				Py_DECREF(pytold);
				*rv = tdata->tg_trigtuple;
			}
			else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event))
			{
				pltevent = PyString_FromString("UPDATE");

				pytnew = PLyDict_FromTuple(&(proc->result), tdata->tg_newtuple,
										   tdata->tg_relation->rd_att);
				PyDict_SetItemString(pltdata, "new", pytnew);
				Py_DECREF(pytnew);
				pytold = PLyDict_FromTuple(&(proc->result), tdata->tg_trigtuple,
										   tdata->tg_relation->rd_att);
				PyDict_SetItemString(pltdata, "old", pytold);
				Py_DECREF(pytold);
				*rv = tdata->tg_newtuple;
			}
			else
			{
				elog(ERROR, "unrecognized OP tg_event: %u", tdata->tg_event);
				pltevent = NULL;	/* keep compiler quiet */
			}

			PyDict_SetItemString(pltdata, "event", pltevent);
			Py_DECREF(pltevent);
		}
		else if (TRIGGER_FIRED_FOR_STATEMENT(tdata->tg_event))
		{
			pltlevel = PyString_FromString("STATEMENT");
			PyDict_SetItemString(pltdata, "level", pltlevel);
			Py_DECREF(pltlevel);

			PyDict_SetItemString(pltdata, "old", Py_None);
			PyDict_SetItemString(pltdata, "new", Py_None);
			*rv = NULL;

			if (TRIGGER_FIRED_BY_INSERT(tdata->tg_event))
				pltevent = PyString_FromString("INSERT");
			else if (TRIGGER_FIRED_BY_DELETE(tdata->tg_event))
				pltevent = PyString_FromString("DELETE");
			else if (TRIGGER_FIRED_BY_UPDATE(tdata->tg_event))
				pltevent = PyString_FromString("UPDATE");
			else if (TRIGGER_FIRED_BY_TRUNCATE(tdata->tg_event))
				pltevent = PyString_FromString("TRUNCATE");
			else
			{
				elog(ERROR, "unrecognized OP tg_event: %u", tdata->tg_event);
				pltevent = NULL;	/* keep compiler quiet */
			}

			PyDict_SetItemString(pltdata, "event", pltevent);
			Py_DECREF(pltevent);
		}
		else
			elog(ERROR, "unrecognized LEVEL tg_event: %u", tdata->tg_event);

		if (tdata->tg_trigger->tgnargs)
		{
			/*
			 * all strings...
			 */
			int			i;
			PyObject   *pltarg;

			pltargs = PyList_New(tdata->tg_trigger->tgnargs);
			for (i = 0; i < tdata->tg_trigger->tgnargs; i++)
			{
				pltarg = PyString_FromString(tdata->tg_trigger->tgargs[i]);

				/*
				 * stolen, don't Py_DECREF
				 */
				PyList_SetItem(pltargs, i, pltarg);
			}
		}
		else
		{
			Py_INCREF(Py_None);
			pltargs = Py_None;
		}
		PyDict_SetItemString(pltdata, "args", pltargs);
		Py_DECREF(pltargs);
	}
	PG_CATCH();
	{
		Py_XDECREF(pltdata);
		PG_RE_THROW();
	}
	PG_END_TRY();

	return pltdata;
}
Beispiel #25
0
static HeapTuple
PLy_modify_tuple(PLyProcedure *proc, PyObject *pltd, TriggerData *tdata,
				 HeapTuple otup)
{
	PyObject   *volatile plntup;
	PyObject   *volatile plkeys;
	PyObject   *volatile plval;
	HeapTuple	rtup;
	int			natts,
				i,
				attn,
				atti;
	int		   *volatile modattrs;
	Datum	   *volatile modvalues;
	char	   *volatile modnulls;
	TupleDesc	tupdesc;
	ErrorContextCallback plerrcontext;

	plerrcontext.callback = plpython_trigger_error_callback;
	plerrcontext.previous = error_context_stack;
	error_context_stack = &plerrcontext;

	plntup = plkeys = plval = NULL;
	modattrs = NULL;
	modvalues = NULL;
	modnulls = NULL;

	PG_TRY();
	{
		if ((plntup = PyDict_GetItemString(pltd, "new")) == NULL)
			ereport(ERROR,
					(errmsg("TD[\"new\"] deleted, cannot modify row")));
		Py_INCREF(plntup);
		if (!PyDict_Check(plntup))
			ereport(ERROR,
					(errmsg("TD[\"new\"] is not a dictionary")));

		plkeys = PyDict_Keys(plntup);
		natts = PyList_Size(plkeys);

		modattrs = (int *) palloc(natts * sizeof(int));
		modvalues = (Datum *) palloc(natts * sizeof(Datum));
		modnulls = (char *) palloc(natts * sizeof(char));

		tupdesc = tdata->tg_relation->rd_att;

		for (i = 0; i < natts; i++)
		{
			PyObject   *platt;
			char	   *plattstr;

			platt = PyList_GetItem(plkeys, i);
			if (PyString_Check(platt))
				plattstr = PyString_AsString(platt);
			else if (PyUnicode_Check(platt))
				plattstr = PLyUnicode_AsString(platt);
			else
			{
				ereport(ERROR,
						(errmsg("TD[\"new\"] dictionary key at ordinal position %d is not a string", i)));
				plattstr = NULL;	/* keep compiler quiet */
			}
			attn = SPI_fnumber(tupdesc, plattstr);
			if (attn == SPI_ERROR_NOATTRIBUTE)
				ereport(ERROR,
						(errmsg("key \"%s\" found in TD[\"new\"] does not exist as a column in the triggering row",
								plattstr)));
			atti = attn - 1;

			plval = PyDict_GetItem(plntup, platt);
			if (plval == NULL)
				elog(FATAL, "Python interpreter is probably corrupted");

			Py_INCREF(plval);

			modattrs[i] = attn;

			if (tupdesc->attrs[atti]->attisdropped)
			{
				modvalues[i] = (Datum) 0;
				modnulls[i] = 'n';
			}
			else if (plval != Py_None)
			{
				PLyObToDatum *att = &proc->result.out.r.atts[atti];

				modvalues[i] = (att->func) (att,
											tupdesc->attrs[atti]->atttypmod,
											plval);
				modnulls[i] = ' ';
			}
			else
			{
				modvalues[i] =
					InputFunctionCall(&proc->result.out.r.atts[atti].typfunc,
									  NULL,
									proc->result.out.r.atts[atti].typioparam,
									  tupdesc->attrs[atti]->atttypmod);
				modnulls[i] = 'n';
			}

			Py_DECREF(plval);
			plval = NULL;
		}

		rtup = SPI_modifytuple(tdata->tg_relation, otup, natts,
							   modattrs, modvalues, modnulls);
		if (rtup == NULL)
			elog(ERROR, "SPI_modifytuple failed: error %d", SPI_result);
	}
	PG_CATCH();
	{
		Py_XDECREF(plntup);
		Py_XDECREF(plkeys);
		Py_XDECREF(plval);

		if (modnulls)
			pfree(modnulls);
		if (modvalues)
			pfree(modvalues);
		if (modattrs)
			pfree(modattrs);

		PG_RE_THROW();
	}
	PG_END_TRY();

	Py_DECREF(plntup);
	Py_DECREF(plkeys);

	pfree(modattrs);
	pfree(modvalues);
	pfree(modnulls);

	error_context_stack = plerrcontext.previous;

	return rtup;
}