/**
* This function initializes the tcp context global instance to 0 except for
* file descriptor descriptor for stdin, stdout and stderr.
*
* @author Mohd Naushad Ahmed
* @version 1.0
* @param none
* @return none
*/
int http_process_http_req ( int conn_id, char *http_req, int http_req_len )
{
char http_header[1024];
char http_body[2048];
int http_header_len;
memset((void*)&http_header, 0, sizeof(http_header));
memset((void*)&http_body, 0, sizeof(http_body));
http_parse_req(conn_id, http_req, http_req_len);
if (!strcmp(g_http_ctx[conn_id].resource_name, "/prelogin.html") ||
!strcmp(g_http_ctx[conn_id].resource_name, "/login_response.html"))
{
http_parse_qs(conn_id);
}
return (0);
}/* http_process_http_req */
static void processor(const char *tx_addr, int port)
{
sys_init(1);
sys_log('E', "started port=%d, tx=%s\n", port, tx_addr);
/* connect to the control thread */
char addr[MAX_ADDR];
sys_address(addr, port);
IO *io = sys_connect(addr, IO_CHUNK);
tx_attach(tx_addr);
/* get env code from the tx */
char *code = tx_program();
char *res = mem_alloc(MAX_BLOCK);
while (!io->stop) {
sys_iready(io, -1);
int status = -1;
long long sid = 0LL, time = sys_millis();
Env *env = NULL;
Arg *arg = NULL;
Vars *v = vars_new(0), *r = NULL, *w = NULL;
Http_Req *req = http_parse_req(io);
if (io->stop)
goto exit;
if (req == NULL) {
status = http_400(io);
goto exit;
}
if (req->method == OPTIONS) {
status = http_opts(io);
goto exit;
}
env = env_new("net", code);
if (str_idx(req->path, "/fn") == 0) {
int idx = (req->path[3] == '/') ? 4 : 3;
int i = 0, len = 1, cnt = 0;
Func **fns = env_funcs(env, req->path + idx, &cnt);
status = http_200(io);
while (status == 200 && len) {
len = pack_fn2csv(fns, cnt, res, MAX_BLOCK, &i);
status = http_chunk(io, res, len);
}
mem_free(fns);
goto exit;
}
/* compare the request with the function defintion */
Func *fn = env_func(env, req->path + 1);
if (fn == NULL) {
Error *err = error_new("unknown function '%s'", req->path + 1);
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
if (fn->rp.name != NULL && req->method != POST) {
status = http_405(io, POST);
goto exit;
}
if (fn->rp.name == NULL && req->method == POST) {
status = http_405(io, GET);
goto exit;
}
/* TODO: think what to do with duplicate parameter values */
for (int i = 0; i < req->args->len; ++i) {
char *name = req->args->names[i];
if (array_freq(req->args->names, req->args->len, name) > 1) {
Error *err = error_new("duplicate parameter '%s' "
"(not supported)",
name);
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
}
if (fn->pp.len != req->args->len) {
Error *err = error_new("expected %d primitive parameters, got %d",
fn->pp.len, req->args->len);
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
arg = mem_alloc(sizeof(Arg));
for (int i = 0; i < fn->pp.len; ++i) {
char *name = fn->pp.names[i];
Type t = fn->pp.types[i];
int idx = array_scan(req->args->names, req->args->len, name);
if (idx < 0) {
Error *err = error_new("unknown parameter '%s'", name);
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
char *val = req->args->vals[idx];
int error = 0;
if (t == Int) {
arg->vals[i].v_int = str_int(val, &error);
} else if (t == Real)
arg->vals[i].v_real = str_real(val, &error);
else if (t == Long)
arg->vals[i].v_long = str_long(val, &error);
else if (t == String) {
error = str_len(val) > MAX_STRING;
if (!error)
str_cpy(arg->vals[i].v_str, val);
}
if (error) {
Error *err = error_new("value '%s' (parameter '%s') "
"is not of type '%s'",
val, name, type_to_str(t));
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
}
if (fn->rp.name != NULL) {
TBuf *body = NULL;
if (req->len > 0) {
Error *err = pack_csv2rel(req->body, fn->rp.head, &body);
if (err != NULL) {
status = http_404(io, err->msg);
mem_free(err);
goto exit;
}
} else {
body = tbuf_new();
}
vars_add(v, fn->rp.name, 0, body);
/* project the parameter */
Rel *param = rel_project(rel_load(fn->rp.head, fn->rp.name),
fn->rp.head->names,
fn->rp.head->len);
rel_eval(param, v, arg);
/* clean the previous version */
tbuf_clean(body);
tbuf_free(body);
/* replace with the new body */
int vpos = array_scan(v->names, v->len, fn->rp.name);
v->vals[vpos] = param->body;
param->body = NULL;
rel_free(param);
}
/* start a transaction */
r = vars_new(fn->r.len);
w = vars_new(fn->w.len);
for (int i = 0; i < fn->r.len; ++i)
vars_add(r, fn->r.names[i], 0, NULL);
for (int i = 0; i < fn->w.len; ++i)
vars_add(w, fn->w.names[i], 0, NULL);
sid = tx_enter(addr, r, w);
/* prepare variables */
for (int i = 0; i < r->len; ++i) {
TBuf *body = vol_read(r->vols[i], r->names[i], r->vers[i]);
vars_add(v, r->names[i], 0, body);
}
for (int i = 0; i < w->len; ++i) {
int pos = array_scan(v->names, v->len, w->names[i]);
if (pos < 0)
vars_add(v, w->names[i], 0, NULL);
}
for (int i = 0; i < fn->t.len; ++i)
vars_add(v, fn->t.names[i], 0, NULL);
/* evaluate the function body */
for (int i = 0; i < fn->slen; ++i)
rel_eval(fn->stmts[i], v, arg);
/* prepare the return value. note, the resulting relation
is just a container for the body, so it is not freed */
Rel *ret = NULL;
if (fn->ret != NULL)
ret = fn->stmts[fn->slen - 1];
/* persist the global variables */
for (int i = 0; i < w->len; ++i) {
int idx = array_scan(v->names, v->len, w->names[i]);
if (idx < 0) {
status = http_500(io);
goto exit;
}
vol_write(w->vols[i], v->vals[idx], w->names[i], w->vers[i]);
tbuf_free(v->vals[idx]);
v->vals[idx] = NULL;
}
/* confirm a success and send the result back */
status = http_200(io);
if (status != 200)
goto exit;
tx_commit(sid);
/* N.B. there is no explicit revert as the transaction manager handles
nested tx_enter and a connectivity failure as a rollback */
int len = 1, i = 0;
while (status == 200 && len) {
len = pack_rel2csv(ret, res, MAX_BLOCK, i++);
status = http_chunk(io, res, len);
}
exit:
if (status != -1)
sys_log('E', "%016llX method %c, path %s, time %lldms - %3d\n",
sid,
(req == NULL) ? '?' : req->method,
(req == NULL) ? "malformed" : req->path,
sys_millis() - time,
status);
if (r != NULL)
vars_free(r);
if (w != NULL)
vars_free(w);
if (arg != NULL)
mem_free(arg);
if (req != NULL)
http_free_req(req);
if (env != NULL)
env_free(env);
for (int i = 0; i < v->len; ++i)
if (v->vals[i] != NULL) {
tbuf_clean(v->vals[i]);
tbuf_free(v->vals[i]);
}
vars_free(v);
sys_term(io);
}
mem_free(code);
mem_free(res);
tx_detach();
sys_close(io);
}
