592 lines
14 KiB
C
592 lines
14 KiB
C
#include "pubsubd.h"
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#include <stdlib.h>
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// CHANNELS
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void pubsubd_channels_init (struct channels *chans) { LIST_INIT(chans); }
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struct channel *
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pubsubd_channels_add (struct channels *chans, struct channel *c)
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{
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if(!chans || !c)
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return NULL;
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struct channel *n = pubsubd_channel_copy (c);
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LIST_INSERT_HEAD(chans, n, entries);
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return n;
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}
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void
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pubsubd_channels_del (struct channels *chans, struct channel *c)
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{
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struct channel *todel = pubsubd_channel_get (chans, c);
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if(todel != NULL) {
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pubsubd_channel_free (todel);
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LIST_REMOVE(todel, entries);
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free (todel);
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todel = NULL;
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}
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}
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void pubsubd_channels_del_all (struct channels *chans)
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{
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if (!chans)
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return;
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struct channel *c = NULL;
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while (!LIST_EMPTY(chans)) {
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c = LIST_FIRST(chans);
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LIST_REMOVE(c, entries);
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pubsubd_channel_free (c);
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free (c);
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c = NULL;
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}
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}
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struct channel * pubsubd_channel_copy (struct channel *c)
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{
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if (c == NULL)
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return NULL;
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struct channel *copy = NULL;
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copy = malloc (sizeof(struct channel));
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bzero (copy, sizeof (struct channel));
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memcpy (copy, c, sizeof(struct channel));
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if (c->chan != NULL) {
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copy->chan = strndup (c->chan, c->chanlen);
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copy->chanlen = c->chanlen;
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}
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return copy;
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}
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void pubsubd_channel_free (struct channel * c)
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{
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// TODO
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if (c == NULL)
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return;
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if (c->chan != NULL) {
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free (c->chan);
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c->chan = NULL;
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}
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if (c->alh != NULL) {
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pubsubd_subscriber_del_all (c->alh);
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free (c->alh);
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}
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}
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struct channel * pubsubd_channel_get (struct channels *chans, struct channel *c)
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{
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struct channel * np = NULL;
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LIST_FOREACH(np, chans, entries) {
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if (pubsubd_channel_eq (np, c))
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return np;
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}
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return NULL;
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}
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int
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pubsubd_channel_eq (const struct channel *c1, const struct channel *c2)
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{
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return (strncmp (c1->chan, c2->chan, c1->chanlen) == 0);
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}
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// SUBSCRIBER
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void pubsubd_subscriber_init (struct app_list_head **chans) {
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if (chans == NULL)
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return;
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if (*chans == NULL)
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*chans = malloc (sizeof(struct channels));
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LIST_INIT(*chans);
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}
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void pubsubd_channels_print (const struct channels *chans)
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{
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printf ("\033[36mmchannels\033[00m\n\n");
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if (chans == NULL)
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return ;
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struct channel *chan = NULL;
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LIST_FOREACH(chan, chans, entries) {
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pubsubd_channel_print (chan);
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}
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}
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void pubsubd_channel_print (const struct channel *c)
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{
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if (c == NULL || c->chan == NULL)
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return;
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printf ( "\033[32mchan %s\033[00m\n\t", c->chan);
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if (c->alh == NULL)
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return;
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struct app_list_elm *ale = NULL;
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LIST_FOREACH(ale, c->alh, entries) {
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srv_process_print (ale->p);
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}
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}
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struct app_list_elm * pubsubd_app_list_elm_copy (const struct app_list_elm *ale)
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{
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if (ale == NULL)
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return NULL;
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struct app_list_elm * n = NULL;
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n = malloc (sizeof (struct app_list_elm));
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if (ale->p != NULL)
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n->p = srv_process_copy (ale->p);
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n->action = ale->action;
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return n;
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}
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int
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pubsubd_subscriber_eq (const struct app_list_elm *ale1, const struct app_list_elm *ale2)
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{
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return srv_process_eq (ale1->p, ale2->p);
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}
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void
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pubsubd_subscriber_add (struct app_list_head *alh, const struct app_list_elm *ale)
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{
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if(!alh || !ale)
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return;
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struct app_list_elm *n = pubsubd_app_list_elm_copy (ale);
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LIST_INSERT_HEAD(alh, n, entries);
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}
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struct app_list_elm *
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pubsubd_subscriber_get (const struct app_list_head *chans, const struct app_list_elm *p)
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{
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struct app_list_elm *np = NULL, *res = NULL;
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LIST_FOREACH(np, chans, entries) {
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if(pubsubd_subscriber_eq (np, p)) {
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res = np;
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}
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}
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return res;
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}
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void
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pubsubd_subscriber_del (struct app_list_head *chans, struct app_list_elm *p)
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{
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struct app_list_elm *todel = pubsubd_subscriber_get (chans, p);
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if(todel != NULL) {
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pubsubd_app_list_elm_free (todel);
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LIST_REMOVE(todel, entries);
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free (todel);
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todel = NULL;
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}
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}
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void pubsubd_subscriber_del_all (struct app_list_head *alh)
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{
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if (!alh)
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return;
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struct app_list_elm *ale = NULL;
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while (!LIST_EMPTY(alh)) {
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ale = LIST_FIRST(alh);
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LIST_REMOVE(ale, entries);
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pubsubd_app_list_elm_free (ale);
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free (ale);
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ale = NULL;
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}
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}
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void pubsubd_app_list_elm_create (struct app_list_elm *ale, struct process *p)
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{
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if (ale == NULL)
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return;
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ale->p = srv_process_copy (p);
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}
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void pubsubd_app_list_elm_free (struct app_list_elm *todel)
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{
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if (todel == NULL || todel->p == NULL)
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return;
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srv_process_free (todel->p);
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}
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// MESSAGE, TODO CBOR
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void pubsubd_msg_serialize (const struct pubsub_msg *msg, char **data, size_t *len)
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{
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if (msg == NULL || data == NULL || len == NULL)
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return;
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// msg: "type(1) chanlen(8) chan datalen(8) data
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*len = 1 + sizeof(size_t) + msg->chanlen + sizeof(size_t) + msg->datalen;
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if (*data != NULL) {
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free (*data);
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*data = NULL;
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}
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*data = malloc(*len);
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size_t i = 0;
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data[0][i] = msg->type; i++;
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memcpy (&data[0][i], &msg->chanlen, sizeof(size_t)); i += sizeof(size_t);
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memcpy (&data[0][i], msg->chan, msg->chanlen); i += msg->chanlen;
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memcpy (&data[0][i], &msg->datalen, sizeof(size_t)); i += sizeof(size_t);
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memcpy (&data[0][i], msg->data, msg->datalen); i += msg->datalen;
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}
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void pubsubd_msg_unserialize (struct pubsub_msg *msg, const char *data, size_t len)
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{
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if (msg == NULL) {
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fprintf (stderr
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, "\033[31merr: pubsubd_msg_unserialize, msg NULL\033[00m\n");
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return;
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}
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if (data == NULL) {
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fprintf (stderr
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, "\033[31merr: pubsubd_msg_unserialize, data NULL\033[00m\n");
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return;
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}
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if (len > BUFSIZ) {
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fprintf (stderr
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, "\033[31merr: pubsubd_msg_unserialize, len %ld\033[00m\n"
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, len);
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return;
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}
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size_t i = 0;
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msg->type = data[i]; i++;
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memcpy (&msg->chanlen, data + i, sizeof(size_t)); i += sizeof(size_t);
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if (msg->chanlen > BUFSIZ) {
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fprintf (stderr, "\033[31merr : msg->chanlen > BUFSIZ\033[00m\n");
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return;
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}
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msg->chan = malloc (msg->chanlen);
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memcpy (msg->chan, data + i, msg->chanlen); i += msg->chanlen;
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memcpy (&msg->datalen, data + i, sizeof(size_t)); i += sizeof(size_t);
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if (msg->datalen > BUFSIZ) {
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fprintf (stderr, "\033[31merr : msg->datalen > BUFSIZ\033[00m\n");
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return;
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}
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msg->data = malloc (msg->datalen);
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memcpy (msg->data, data + i, msg->datalen); i += msg->datalen;
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}
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void pubsubd_msg_free (struct pubsub_msg *msg)
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{
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if (msg == NULL) {
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fprintf (stderr, "\033[31merr: pubsubd_msg_free, msg NULL\033[00m\n");
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return;
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}
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if (msg->chan) {
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free (msg->chan);
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msg->chan = NULL;
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}
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if (msg->data) {
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free (msg->data);
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msg->data = NULL;
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}
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}
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// COMMUNICATION
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int pubsubd_get_new_process (struct service *srv, struct app_list_elm *ale
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, struct channels *chans, struct channel **c)
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{
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if (srv == NULL || ale == NULL || chans == NULL)
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return -1;
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char *buf = NULL;
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size_t msize = 0;
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srv_get_listen_raw (srv, &buf, &msize);
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// parse pubsubd init msg (sent in TMPDIR/<service>)
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//
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// line fmt : pid index version action chan
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// action : quit | pub | sub
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size_t i = 0;
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char *str = NULL, *token = NULL, *saveptr = NULL;
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pid_t pid = 0;
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int index = 0;
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int version = 0;
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char chan[BUFSIZ];
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bzero (chan, BUFSIZ);
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for (str = buf, i = 1; ; str = NULL, i++) {
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token = strtok_r(str, " ", &saveptr);
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if (token == NULL)
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break;
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switch (i) {
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case 1 : pid = strtoul(token, NULL, 10); break;
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case 2 : index = strtoul(token, NULL, 10); break;
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case 3 : version = strtoul(token, NULL, 10); break;
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case 4 : {
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if (strncmp("both", token, 4) == 0) {
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ale->action = PUBSUB_BOTH;
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}
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else if (strncmp("pub", token, 3) == 0) {
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ale->action = PUBSUB_PUB;
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}
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else if (strncmp("sub", token, 3) == 0) {
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ale->action = PUBSUB_SUB;
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}
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else { // everything else is about killing the service
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ale->action = PUBSUB_QUIT;
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}
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break;
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}
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case 5 : {
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if (ale->action != PUBSUB_QUIT)
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memcpy (chan, token, (strlen (token) < BUFSIZ) ?
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strlen (token) : BUFSIZ);
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break;
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}
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}
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}
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if (buf != NULL) {
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free (buf);
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buf = NULL;
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}
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if (ale->action == PUBSUB_QUIT) {
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return 0;
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}
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if (ale->p != NULL) {
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free (ale->p);
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ale->p = NULL;
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}
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ale->p = malloc (sizeof (struct process));
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srv_process_gen (ale->p, pid, index, version);
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if (*c == NULL) {
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*c = malloc (sizeof (struct channel));
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}
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if (c[0]->chan != NULL) {
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free (c[0]->chan);
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c[0]->chan = NULL;
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}
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chan[BUFSIZ -1] = '\0';
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c[0]->chan = strndup (chan, BUFSIZ);
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c[0]->chanlen = strlen (chan);
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struct channel *new_chan = NULL;
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new_chan = pubsubd_channel_get (chans, *c);
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if (new_chan == NULL) {
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new_chan = pubsubd_channels_add (chans, *c);
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pubsubd_subscriber_init (&new_chan->alh);
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}
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pubsubd_channel_free (*c);
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*c = new_chan;
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// add the subscriber
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if (ale->action == PUBSUB_SUB || ale->action == PUBSUB_BOTH)
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pubsubd_subscriber_add (new_chan->alh, ale);
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return 0;
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}
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// TODO CBOR
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int pubsubd_msg_read_cb (FILE *f, char ** buf, size_t * msize)
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{
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// msg: "type(1) chanlen(8) chan datalen(8) data
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printf ("\033[36m ON PASSE DANS pubsubd_msg_read_cb \033[00m \n");
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// read
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char type = ' ';
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fread (&type, 1, 1, f);
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size_t chanlen = 0;
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fread (&chanlen, sizeof (size_t), 1, f);
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if (chanlen > BUFSIZ) {
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return 1;
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}
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char *chan = NULL;
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chan = malloc (chanlen);
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fread (chan, chanlen, 1, f);
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size_t datalen = 0;
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fread (&datalen, sizeof (size_t), 1, f);
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if (datalen > BUFSIZ) {
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return 1;
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}
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char *data = NULL;
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data = malloc (datalen);
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fread (data, datalen, 1, f);
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*msize = 1 + 2 * sizeof (size_t) + chanlen + datalen;
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if (*buf == NULL) {
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*buf = malloc(*msize);
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}
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// TODO CHECK THIS
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size_t i = 0;
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char *cbuf = *buf;
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cbuf[i] = type; i++;
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memcpy (cbuf + i, &chanlen, sizeof(size_t)); i += sizeof(size_t);
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memcpy (cbuf + i, chan, chanlen); i += chanlen;
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memcpy (cbuf + i, &datalen, sizeof(size_t)); i += sizeof(size_t);
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memcpy (cbuf + i, data, datalen); i += datalen;
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free (chan);
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free (data);
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printf ("\033[36m ON SORT de pubsubd_msg_read_cb \033[00m \n");
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return 0;
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}
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// alh from the channel, message to send
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void pubsubd_msg_send (const struct app_list_head *alh, const struct pubsub_msg * m)
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{
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struct app_list_elm * ale = NULL;
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char *buf = NULL;
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size_t msize = 0;
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pubsubd_msg_serialize (m, &buf, &msize);
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LIST_FOREACH(ale, alh, entries) {
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srv_write (ale->p, buf, msize);
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}
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if (buf != NULL) {
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free (buf);
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}
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}
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void pubsubd_msg_print (const struct pubsub_msg *msg)
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{
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if (msg == NULL) {
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return;
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}
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printf ("\t\t\033[36mMessage\033[00m\n");
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printf ("\t\ttype %d\n", msg->type);
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printf ("\t\tchan %s\n", msg->chan);
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printf ("\t\tdata %s\n", msg->data);
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}
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void pubsubd_msg_recv (struct process *p, struct pubsub_msg *m)
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{
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// read the message from the process
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size_t mlen = 0;
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char *buf = NULL;
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srv_read_cb (p, &buf, &mlen, pubsubd_msg_read_cb);
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pubsubd_msg_unserialize (m, buf, mlen);
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if (buf != NULL) {
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free (buf);
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}
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}
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#define PUBSUB_SUBSCRIBER_ACTION_STR_PUB "pub"
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#define PUBSUB_SUBSCRIBER_ACTION_STR_SUB "sub"
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#define PUBSUB_SUBSCRIBER_ACTION_STR_BOTH "both"
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#define PUBSUB_SUBSCRIBER_ACTION_STR_QUIT "quit"
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// enum app_list_elm_action {PUBSUB_QUIT = 1, PUBSUB_PUB, PUBSUB_SUB, PUBSUB_BOTH};
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char * pubsub_action_to_str (enum app_list_elm_action action)
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{
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switch (action) {
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case PUBSUB_PUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_PUB);
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case PUBSUB_SUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_SUB);
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case PUBSUB_BOTH : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_BOTH);
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case PUBSUB_QUIT : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_QUIT);
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}
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return NULL;
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}
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void pubsub_connection (struct service *srv, struct process *p, enum app_list_elm_action action, const char *channame)
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{
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char * straction = NULL;
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straction = pubsub_action_to_str (action);
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char line[BUFSIZ];
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bzero (line, BUFSIZ);
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// line fmt : pid index version action chan
|
|
// "quit" action is also possible (see pubsub_disconnect)
|
|
snprintf (line, BUFSIZ, "%d %d %d %s %s\n"
|
|
, p->pid, p->index, p->version
|
|
, straction
|
|
, channame);
|
|
line[BUFSIZ -1] = '\0'; // to be sure
|
|
|
|
// send the connection line in the $TMP/<service> pipe
|
|
app_srv_connection (srv, line, strlen (line));
|
|
|
|
if (straction != NULL)
|
|
free (straction);
|
|
}
|
|
|
|
void pubsub_msg_send (const struct service *s, struct process *p, const struct pubsub_msg * m)
|
|
{
|
|
char *buf = NULL;
|
|
size_t msize = 0;
|
|
pubsubd_msg_serialize (m, &buf, &msize);
|
|
|
|
app_write (p, buf, msize);
|
|
|
|
if (buf != NULL) {
|
|
free (buf);
|
|
}
|
|
}
|
|
|
|
void pubsub_msg_recv (const struct service *s, struct process *p, struct pubsub_msg * m)
|
|
{
|
|
// read the message from the process
|
|
size_t mlen = 0;
|
|
char *buf = NULL;
|
|
app_read_cb (p, &buf, &mlen, pubsubd_msg_read_cb);
|
|
|
|
pubsubd_msg_unserialize (m, buf, mlen);
|
|
|
|
if (buf != NULL) {
|
|
free (buf);
|
|
}
|
|
}
|
|
|
|
// SERVICE
|
|
|
|
void pubsubd_srv_init ();
|