/*-------------------------------------------------------------------------*\
* Determines how much time we have left for the next system call,
* if the previous call was successful
* Input
* tm: timeout control structure
* Returns
* the number of ms left or -1 if there is no time limit
\*-------------------------------------------------------------------------*/
double timeout_get(p_timeout tm) {
if (tm->block < 0.0 && tm->total < 0.0) {
return -1;
} else if (tm->block < 0.0) {
double t = tm->total - timeout_gettime() + tm->start;
return MAX(t, 0.0);
} else if (tm->total < 0.0) {
return tm->block;
} else {
double t = tm->total - timeout_gettime() + tm->start;
return MIN(tm->block, MAX(t, 0.0));
}
}
/*-------------------------------------------------------------------------*\
* object:send() interface
\*-------------------------------------------------------------------------*/
int buffer_meth_send(lua_State *L, p_buffer buf) {
int top = lua_gettop(L);
int err = IO_DONE;
size_t size = 0, sent = 0;
const char *data = luaL_checklstring(L, 2, &size);
long start = (long) luaL_optnumber(L, 3, 1);
long end = (long) luaL_optnumber(L, 4, -1);
#ifdef LUASOCKET_DEBUG
p_timeout tm = timeout_markstart(buf->tm);
#endif
if (start < 0) start = (long) (size+start+1);
if (end < 0) end = (long) (size+end+1);
if (start < 1) start = (long) 1;
if (end > (long) size) end = (long) size;
if (start <= end) err = sendraw(buf, data+start-1, end-start+1, &sent);
/* check if there was an error */
if (err != IO_DONE) {
lua_pushnil(L);
lua_pushstring(L, buf->io->error(buf->io->ctx, err));
lua_pushnumber(L, (lua_Number) (sent+start-1));
} else {
lua_pushnumber(L, (lua_Number) (sent+start-1));
lua_pushnil(L);
lua_pushnil(L);
}
#ifdef LUASOCKET_DEBUG
/* push time elapsed during operation as the last return value */
lua_pushnumber(L, timeout_gettime() - timeout_getstart(tm));
#endif
return lua_gettop(L) - top;
}
/*-------------------------------------------------------------------------*\
* object:setstats() interface
\*-------------------------------------------------------------------------*/
int buffer_meth_setstats(lua_State *L, p_buffer buf) {
buf->received = (long) luaL_optnumber(L, 2, (lua_Number) buf->received);
buf->sent = (long) luaL_optnumber(L, 3, (lua_Number) buf->sent);
if (lua_isnumber(L, 4)) buf->birthday = timeout_gettime() - lua_tonumber(L, 4);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Initializes C structure
\*-------------------------------------------------------------------------*/
void buffer_init(p_buffer buf, p_io io, p_timeout tm) {
buf->first = buf->last = 0;
buf->io = io;
buf->tm = tm;
buf->received = buf->sent = 0;
buf->birthday = timeout_gettime();
}
/*-------------------------------------------------------------------------*\
* object:receive() interface
\*-------------------------------------------------------------------------*/
int buffer_meth_receive(lua_State *L, p_buffer buf) {
int err = IO_DONE, top = lua_gettop(L);
luaL_Buffer b;
size_t size;
const char *part = luaL_optlstring(L, 3, "", &size);
#ifdef LUASOCKET_DEBUG
p_timeout tm = timeout_markstart(buf->tm);
#endif
/* initialize buffer with optional extra prefix
* (useful for concatenating previous partial results) */
luaL_buffinit(L, &b);
luaL_addlstring(&b, part, size);
/* receive new patterns */
if (!lua_isnumber(L, 2)) {
const char *p= luaL_optstring(L, 2, "*l");
if (p[0] == '*' && p[1] == 'l') err = recvline(buf, &b);
else if (p[0] == '*' && p[1] == 'a') err = recvall(buf, &b);
else luaL_argcheck(L, 0, 2, "invalid receive pattern");
/* get a fixed number of bytes (minus what was already partially
* received) */
} else {
double n = lua_tonumber(L, 2);
size_t wanted = (size_t) n;
luaL_argcheck(L, n >= 0, 2, "invalid receive pattern");
if (size == 0 || wanted > size)
err = recvraw(buf, wanted-size, &b);
}
/* check if there was an error */
if (err != IO_DONE) {
/* we can't push anyting in the stack before pushing the
* contents of the buffer. this is the reason for the complication */
luaL_pushresult(&b);
lua_pushstring(L, buf->io->error(buf->io->ctx, err));
lua_pushvalue(L, -2);
lua_pushnil(L);
lua_replace(L, -4);
} else {
luaL_pushresult(&b);
lua_pushnil(L);
lua_pushnil(L);
}
#ifdef LUASOCKET_DEBUG
/* push time elapsed during operation as the last return value */
lua_pushnumber(L, timeout_gettime() - timeout_getstart(tm));
#endif
return lua_gettop(L) - top;
}
/*-------------------------------------------------------------------------*\
* Returns the time the system has been up, in secconds.
\*-------------------------------------------------------------------------*/
static int timeout_lua_gettime(lua_State *L)
{
lua_pushnumber(L, timeout_gettime());
return 1;
}
/*-------------------------------------------------------------------------*\
* Marks the operation start time in structure
* Input
* tm: timeout control structure
\*-------------------------------------------------------------------------*/
p_timeout timeout_markstart(p_timeout tm) {
tm->start = timeout_gettime();
return tm;
}
/*-------------------------------------------------------------------------*\
* object:getstats() interface
\*-------------------------------------------------------------------------*/
int buffer_meth_getstats(lua_State *L, p_buffer buf) {
lua_pushnumber(L, (lua_Number) buf->received);
lua_pushnumber(L, (lua_Number) buf->sent);
lua_pushnumber(L, timeout_gettime() - buf->birthday);
return 3;
}
/*-------------------------------------------------------------------------*\
* Marks the operation start time in structure
* Input
* tm: timeout control structure
\*-------------------------------------------------------------------------*/
LUASOCKET_API p_timeout timeout_markstart(p_timeout tm) {
tm->start = timeout_gettime();
return tm;
}
