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big changes in pubsub libs => WIP

more_to_read
Philippe PITTOLI 2018-10-30 11:13:30 +01:00
parent e8db551536
commit cbdbe79c5b
10 changed files with 332 additions and 527 deletions
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40
pubsub/app/pubsub-client.c
View File

@ -3,13 +3,12 @@
#include "../lib/message.h"
#include "../lib/channels.h"
#include "../lib/pubsub.h"
#include "../lib/pubsubd.h"
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
#define PUBSUBD_SERVICE_NAME "pubsubd"
void usage (char **argv) {
printf ( "usage: %s [chan [pub]]\n", argv[0]);
}
@ -26,16 +25,12 @@ void chan_sub (struct ipc_service *srv, char *chan)
// meta data on the message
msg.type = PUBSUB_MSG_TYPE_SUB;
msg.chanlen = strlen (chan) + 1;
msg.chan = malloc (msg.chanlen);
memset (msg.chan, 0, msg.chanlen);
strncpy (msg.chan, chan, msg.chanlen);
msg.chan[strlen (chan)] = '\0';
pubsub_message_set_chan (&msg, chan, strlen(chan));
pubsub_message_send (srv, &msg);
printf ("subscribed to %s\n", chan);
pubsub_message_free (&msg);
pubsub_message_empty (&msg);
}
void main_loop (char **env, int index, int version
@ -64,11 +59,7 @@ void main_loop (char **env, int index, int version
// meta data on the message
msg.type = PUBSUB_MSG_TYPE_PUB;
msg.chanlen = strlen (chan) + 1;
msg.chan = malloc (msg.chanlen);
memset (msg.chan, 0, msg.chanlen);
strncpy ((char *) msg.chan, chan, msg.chanlen);
msg.chan[strlen (chan)] = '\0';
pubsub_message_set_chan (&msg, chan, strlen(chan));
struct ipc_event event;
memset (&event, 0, sizeof (struct ipc_event));
@ -107,23 +98,21 @@ void main_loop (char **env, int index, int version
print_cmd ();
// TODO: remove \n
msg.datalen = m->length + 1;
msg.data = malloc (msg.datalen);
memset (msg.data, 0, msg.datalen);
strncpy (msg.data, m->payload, msg.datalen);
msg.data[msg.datalen] = '\0';
pubsub_message_set_chan (&msg, chan, strlen(chan));
pubsub_message_set_data (&msg, m->payload, m->length);
pubsub_message_send (&srv, &msg);
free (msg.data);
msg.data = NULL;
msg.datalen = 0;
pubsub_message_empty (&msg);
}
break;
case IPC_EVENT_TYPE_MESSAGE:
{
struct ipc_message *m = event.m;
printf ("msg recv: %.*s", m->length, m->payload);
// TODO: correctly print the message
print_hexa ("received msg hexa", m->payload, m->length);
pubsub_message_from_message (&msg, m);
printf ("\033[31m>\033[00m %.*s\n", (int) msg.datalen, msg.data);
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
@ -135,6 +124,7 @@ void main_loop (char **env, int index, int version
exit (EXIT_SUCCESS);
};
break;
case IPC_EVENT_TYPE_NOT_SET:
case IPC_EVENT_TYPE_CONNECTION:
case IPC_EVENT_TYPE_ERROR:
@ -144,7 +134,7 @@ void main_loop (char **env, int index, int version
}
// free everything
pubsub_message_free (&msg);
pubsub_message_empty (&msg);
printf ("disconnection...\n");
ipc_services_free (&services);

172
pubsub/app/pubsubc.c
View File

@ -1,172 +0,0 @@
// int main(void) { return 0; }
// TODO: select on service + input instead of threads
#include "../../core/ipc.h"
#include "../lib/pubsub.h"
#include "../lib/pubsubd.h"
#include <stdlib.h>
#include <pthread.h>
#include <unistd.h>
void usage (char **argv) {
printf ( "usage: %s [chan [pub]]\n", argv[0]);
}
void print_cmd (void) {
printf ("\033[32m>\033[00m ");
fflush (stdout);
}
void * listener (void *params)
{
int s = 0;
s = pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, NULL);
if (s != 0) {
handle_err ("listener", "pthread_setcancelstate != 0");
}
struct ipc_service *srv = NULL;
srv = (struct ipc_service *) params;
if (srv == NULL) {
handle_err ("listener", "no service passed");
return NULL;
}
// main loop
while (1) {
struct pubsub_msg m;
memset (&m, 0, sizeof (struct pubsub_msg));
pubsub_message_recv (srv, &m);
printf ("\r\033[31m>\033[00m %s\n", m.data);
print_cmd ();
pubsub_message_free (&m);
}
pthread_exit (NULL);
}
void chan_sub (struct ipc_service *srv, char *chan)
{
struct pubsub_msg msg;
memset (&msg, 0, sizeof (struct pubsub_msg));
// meta data on the message
msg.type = PUBSUB_MSG_TYPE_SUB;
msg.chanlen = strlen (chan) + 1;
msg.chan = malloc (msg.chanlen);
memset (msg.chan, 0, msg.chanlen);
strncpy (msg.chan, chan, msg.chanlen);
msg.chan[strlen (chan)] = '\0';
pubsub_message_send (srv, &msg);
printf ("subscribed to %s\n", chan);
pubsub_message_free (&msg);
}
void main_loop (char **env, int index, int version
, char *cmd, char *chan)
{
printf ("connection to pubsubd: index %d version %d "
"cmd %s chan %s\n"
, index, version, cmd, chan );
struct ipc_service srv;
memset (&srv, 0, sizeof (struct ipc_service));
pubsub_connection (env, &srv);
printf ("connected\n");
if (strncmp (cmd, "sub", 3) == 0) {
chan_sub (&srv, chan);
}
pthread_t thr;
memset (&thr, 0, sizeof (pthread_t));
pthread_create (&thr, NULL, listener, &srv);
pthread_detach (thr);
printf ("main_loop\n");
struct pubsub_msg msg;
memset (&msg, 0, sizeof (struct pubsub_msg));
// meta data on the message
msg.type = PUBSUB_MSG_TYPE_PUB;
msg.chanlen = strlen (chan) + 1;
msg.chan = malloc (msg.chanlen);
memset (msg.chan, 0, msg.chanlen);
strncpy ((char *) msg.chan, chan, msg.chanlen);
msg.chan[strlen (chan)] = '\0';
// msg loop
for (;;) {
char buf[BUFSIZ];
memset (buf, 0, BUFSIZ);
print_cmd ();
fflush (stdout);
size_t mlen = read (0, buf, BUFSIZ);
// remove \n
if (mlen > 1) {
mlen--;
}
buf[mlen] = '\0';
if (strncmp(buf, "quit", strlen ("quit")) == 0) {
break;
}
msg.datalen = strlen (buf) + 1;
msg.data = malloc (msg.datalen);
memset (msg.data, 0, msg.datalen);
strncpy ((char *) msg.data, buf, msg.datalen);
msg.data[strlen(buf)] = '\0';
pubsub_message_send (&srv, &msg);
free (msg.data);
msg.data = NULL;
msg.datalen = 0;
}
// free everything
pubsub_message_free (&msg);
pthread_cancel (thr);
pthread_join (thr, NULL);
printf ("disconnection...\n");
// disconnect from the server
pubsub_disconnect (&srv);
}
int main(int argc, char **argv, char **env)
{
char *cmd = "sub";
char *chan = "chan1";
if (argc == 2 && strncmp("-h", argv[1], 2) == 0) {
usage (argv);
exit (0);
}
if (argc >= 2) {
chan = argv[1];
}
if (argc >= 3) {
cmd = argv[2];
}
int index = 0;
// don't care about the version
int version = 0;
main_loop (env, index, version, cmd, chan);
return EXIT_SUCCESS;
}

154
pubsub/app/pubsubd.c
View File

@ -1,16 +1,161 @@
#include "../../core/ipc.h"
#include "../lib/pubsubd.h"
#include <stdlib.h>
#include "../lib/message.h"
#include "../lib/channels.h"
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <signal.h>
#define PUBSUBD_SERVICE_NAME "pubsubd"
// to quit them properly if a signal occurs
struct ipc_service srv;
struct channels chans;
void pubsubd_send (const struct ipc_clients *clients, const struct pubsub_msg * pubsub_msg)
{
if (clients == NULL) {
fprintf (stderr, "pubsubd_send: clients == NULL");
return;
}
if (pubsub_msg == NULL) {
fprintf (stderr, "pubsubd_send: pubsub_msg == NULL");
return;
}
char *buf = NULL;
size_t msize = 0;
pubsub_message_serialize (pubsub_msg, &buf, &msize);
struct ipc_message m;
memset (&m, 0, sizeof (struct ipc_message));
ipc_message_format_data (&m, buf, msize);
int i;
for (i = 0; i < clients->size ; i++) {
ipc_server_write (clients->clients[i], &m);
}
ipc_message_empty (&m);
if (buf != NULL) {
free (buf);
}
}
void pubsubd_main_loop (struct ipc_service *srv, struct channels *chans)
{
int i, ret = 0;
struct ipc_clients clients;
memset(&clients, 0, sizeof(struct ipc_clients));
struct ipc_clients proc_to_read;
memset(&proc_to_read, 0, sizeof(struct ipc_clients));
struct ipc_event event;
memset(&event, 0, sizeof (struct ipc_event));
event.type = IPC_EVENT_TYPE_NOT_SET;
int cpt = 0;
while(1) {
ret = ipc_service_poll_event (&clients, srv, &event);
if (ret != 0) {
handle_error("ipc_service_poll_event != 0");
// the application will shut down, and close the service
if (ipc_server_close (srv) < 0) {
handle_error("ipc_server_close < 0");
}
exit (EXIT_FAILURE);
}
switch (event.type) {
case IPC_EVENT_TYPE_CONNECTION:
{
cpt++;
struct ipc_client *cli = event.origin;
printf ("connection of client %d: %d clients connected\n", cli->proc_fd, cpt);
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
{
cpt--;
struct ipc_client *cli = event.origin;
printf ("disconnection of client %d: %d clients remaining\n", cli->proc_fd, cpt);
// TODO: to test, unsubscribe when closing
pubsubd_channels_unsubscribe_everywhere (chans, cli);
// free the ipc_client structure
free (event.origin);
};
break;
case IPC_EVENT_TYPE_MESSAGE:
{
// TODO: handle a message
struct ipc_message *m = event.m;
print_hexa ("received msg hexa", m->payload, m->length);
struct ipc_client *cli = event.origin;
struct pubsub_msg pm;
memset (&pm, 0, sizeof (struct pubsub_msg));
pubsub_message_from_message (&pm, m);
if (pm.type == PUBSUB_MSG_TYPE_SUB) {
printf ("client %d subscribing to %s\n"
, cli->proc_fd
, pm.chan);
pubsubd_channels_subscribe (chans
, pm.chan, cli);
}
if (pm.type == PUBSUB_MSG_TYPE_UNSUB) {
printf ("client %d unsubscribing to %s\n", cli->proc_fd, pm.chan);
pubsubd_channels_unsubscribe (chans, pm.chan, cli);
}
if (pm.type == PUBSUB_MSG_TYPE_PUB) {
// printf ("client %d: publishing to %s: %s\n", cli->proc_fd, pm.chan, pm.data);
printf ("client %d: ", cli->proc_fd);
pubsub_message_print (&pm);
struct channel *chan = pubsubd_channel_search (chans, pm.chan);
if (chan == NULL) {
handle_err ("handle_new_msg", "publish on nonexistent channel");
ipc_message_empty (m);
continue;
}
pubsubd_send (chan->subs, &pm);
}
pubsub_message_empty (&pm);
};
break;
case IPC_EVENT_TYPE_ERROR:
{
fprintf (stderr, "a problem happened with client %d\n"
, ((struct ipc_client*) event.origin)->proc_fd);
};
break;
default :
{
fprintf (stderr, "there must be a problem, event not set\n");
};
}
}
for (i = 0; i < clients.size; i++) {
if (ipc_server_close_client (clients.clients[i]) < 0) {
handle_error( "server_close_client < 0");
}
}
pubsubd_channels_del_all (chans);
}
void handle_signal (int signalnumber)
{
// the application will shut down, and remove the service named pipe
@ -27,7 +172,6 @@ void handle_signal (int signalnumber)
int
main(int argc, char **argv, char **env)
{
argc = argc;
argv = argv;

3
pubsub/lib/channels.h
View File

@ -1,8 +1,7 @@
#ifndef __CHANNELS_H__
#define __CHANNELS_H__
#include "../../core/queue.h"
#include "../../core/client.h"
#include "../../core/ipc.h"
// head of the list
LIST_HEAD(channels, channel);

153
pubsub/lib/message.c
View File

@ -1,9 +1,32 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h> // strndup, strncpy
#include "message.h"
#include "../../core/error.h"
void pubsub_message_set_data (struct pubsub_msg *pm, char *data, size_t len)
{
pm->datalen = len;
if (pm->data != NULL) {
free (pm->data);
}
pm->data = malloc (len + 1);
memset (pm->data, 0, len);
strncpy (pm->data, data, len);
pm->data[len] = '\0';
}
void pubsub_message_set_chan (struct pubsub_msg *pm, char *chan, size_t len)
{
pm->chanlen = len;
if (pm->chan != NULL) {
free (pm->chan);
}
pm->chan = malloc (len + 1);
memset (pm->chan, 0, len);
strncpy (pm->chan, chan, len);
pm->chan[len] = '\0';
}
void pubsub_message_serialize (const struct pubsub_msg *msg, char **data, size_t *len)
{
@ -59,6 +82,83 @@ void pubsub_message_serialize (const struct pubsub_msg *msg, char **data, size_t
*len = buflen;
}
void pubsub_message_from_message (struct pubsub_msg *pm, struct ipc_message *m)
{
size_t offset = 0;
pubsub_message_empty (pm); // just in case
pm->type = m->type;
// chan
memcpy (&pm->chanlen, m->payload + offset, sizeof (size_t));
if (pm->chanlen > BUFSIZ) {
handle_err ("pubsub_message_from_message", "chanlen > BUFSIZ");
return;
}
offset += sizeof (size_t);
if (pm->chanlen > 0) {
pubsub_message_set_chan (pm, m->payload + offset, pm->chanlen);
printf ("from ipc_message, chan: %s, chanlen = %lu\n", pm->chan, pm->chanlen);
}
// data
memcpy (&pm->datalen, m->payload + offset, sizeof (size_t));
if (pm->datalen > BUFSIZ) {
handle_err ("pubsub_message_from_message", "chanlen > BUFSIZ");
return;
}
offset += sizeof (size_t);
if (pm->datalen > 0) {
pubsub_message_set_data (pm, m->payload + offset, pm->datalen);
printf ("from ipc_message, data: %s, datalen = %lu\n", pm->data, pm->datalen);
}
}
void pubsub_message_to_message (const struct pubsub_msg *msg, struct ipc_message *m)
{
if (msg == NULL) {
handle_err ("pubsub_message_to_message", "msg == NULL");
return;
}
if (m == NULL) {
handle_err ("pubsub_message_to_message", "data == NULL");
return;
}
ipc_message_empty (m); // just in case
size_t buflen = 2 * sizeof (size_t) + msg->chanlen + msg->datalen;
if (buflen > BUFSIZ) {
handle_err ("pubsub_message_serialize", "chanlen + datalen too high");
return;
}
char *buf = malloc (buflen);
memset (buf, 0, buflen);
size_t offset = 0;
m->type = msg->type;
// chan
memcpy (buf + offset, &msg->chanlen, sizeof (size_t));
offset += sizeof (size_t);
memcpy (buf + offset, msg->chan, msg->chanlen);
offset += msg->chanlen;
// data
memcpy (buf + offset, &msg->datalen, sizeof (size_t));
offset += sizeof (size_t);
memcpy (buf + offset, msg->data, msg->datalen);
offset += msg->datalen;
m->payload = buf;
m->length = buflen;
}
void pubsub_message_unserialize (struct pubsub_msg *msg, const char *buf, size_t mlen)
{
if (msg == NULL) {
@ -66,7 +166,7 @@ void pubsub_message_unserialize (struct pubsub_msg *msg, const char *buf, size_t
return;
}
pubsub_message_free (msg);
pubsub_message_empty (msg);
if (mlen > BUFSIZ) {
handle_err ("pubsub_message_unserialize", "mlen > BUFSIZ");
@ -103,30 +203,59 @@ void pubsub_message_unserialize (struct pubsub_msg *msg, const char *buf, size_t
offset += msg->datalen;
}
void pubsub_message_free (struct pubsub_msg *msg)
void pubsub_message_empty (struct pubsub_msg *msg)
{
if (msg == NULL) {
handle_err ("pubsub_message_free", "msg == NULL");
handle_err ("pubsub_message_empty", "msg == NULL");
return;
}
if (msg->chan) {
if (msg->chan != NULL) {
free (msg->chan);
msg->chan = NULL;
}
if (msg->data) {
if (msg->data != NULL) {
free (msg->data);
msg->data = NULL;
}
}
void pubsub_message_print (const struct pubsub_msg *msg)
void pubsub_message_print (const struct pubsub_msg *pm)
{
if (msg == NULL) {
handle_err ("pubsub_message_print", "msg == NULL");
if (pm == NULL) {
handle_err ("pubsub_message_print", "pm == NULL");
return;
}
printf ("msg: type=%d chan=%s, data=%s\n"
, msg->type, msg->chan, msg->data);
if (pm->chanlen > 0 && pm->datalen > 0) {
printf ("msg: type: %u, chan: %s (%lu bytes), data: %s (%lu bytes)\n"
, pm->type, pm->chan, pm->chanlen, pm->data, pm->datalen);
} else if (pm->chanlen > 0) {
printf ("msg: type: %u, chan: %s (%lu bytes), and no data\n"
, pm->type, pm->chan, pm->chanlen);
} else if (pm->datalen > 0) {
printf ("msg: type: %u, no chan, data: %s (%lu bytes)\n"
, pm->type, pm->data, pm->datalen);
}
}
int pubsub_message_send (struct ipc_service *srv, const struct pubsub_msg * pm)
{
struct ipc_message m;
memset (&m, 0, sizeof (struct ipc_message));
pubsub_message_to_message (pm, &m);
ipc_application_write (srv, &m);
ipc_message_empty (&m);
return 0;
}
char * pubsub_action_to_str (enum subscriber_action action)
{
switch (action) {
case PUBSUB_PUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_PUB);
case PUBSUB_SUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_SUB);
default : return strdup ("undocumented action");
}
return NULL;
}

30
pubsub/lib/message.h
View File

@ -1,9 +1,23 @@
#ifndef __PUBSUB_MSG_H__
#define __PUBSUB_MSG_H__
#define PUBSUB_MSG_TYPE_SUB 1
#define PUBSUB_MSG_TYPE_UNSUB 2
#define PUBSUB_MSG_TYPE_PUB 3
#include "../../core/ipc.h"
#define PUBSUB_SUBSCRIBER_ACTION_STR_PUB "pub"
#define PUBSUB_SUBSCRIBER_ACTION_STR_SUB "sub"
enum subscriber_action {PUBSUB_PUB, PUBSUB_SUB};
#define PUBSUB_TYPE_MESSAGE 1
#define PUBSUB_TYPE_ERROR 2
#define PUBSUB_TYPE_DEBUG 4
#define PUBSUB_TYPE_INFO 5
enum pubsub_message_types {
PUBSUB_MSG_TYPE_SUB
, PUBSUB_MSG_TYPE_UNSUB
, PUBSUB_MSG_TYPE_PUB
};
struct pubsub_msg {
unsigned char type; // message type : alert, notification, …
@ -13,9 +27,17 @@ struct pubsub_msg {
size_t datalen;
};
void pubsub_message_from_message (struct pubsub_msg *msg, struct ipc_message *m);
void pubsub_message_to_message (const struct pubsub_msg *msg, struct ipc_message *m);
void pubsub_message_set_chan (struct pubsub_msg *pm, char *chan, size_t len);
void pubsub_message_set_data (struct pubsub_msg *pm, char *data, size_t len);
void pubsub_message_serialize (const struct pubsub_msg *msg, char **data, size_t *len);
void pubsub_message_unserialize (struct pubsub_msg *msg, const char *data, size_t len);
void pubsub_message_free (struct pubsub_msg *msg);
void pubsub_message_empty (struct pubsub_msg *msg);
void pubsub_message_print (const struct pubsub_msg *msg);
int pubsub_message_send (struct ipc_service *srv, const struct pubsub_msg * m);
#endif

98
pubsub/lib/pubsub.c
View File

@ -1,98 +0,0 @@
#include <stdlib.h>
#include <string.h> // strndup
#include "pubsub.h"
#include "pubsubd.h"
#define PUBSUB_SUBSCRIBER_ACTION_STR_PUB "pub"
#define PUBSUB_SUBSCRIBER_ACTION_STR_SUB "sub"
#define PUBSUB_SUBSCRIBER_ACTION_STR_BOTH "both"
#define PUBSUB_SUBSCRIBER_ACTION_STR_QUIT "quit"
char * pubsub_action_to_str (enum subscriber_action action)
{
switch (action) {
case PUBSUB_PUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_PUB);
case PUBSUB_SUB : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_SUB);
case PUBSUB_BOTH : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_BOTH);
case PUBSUB_QUIT : return strdup (PUBSUB_SUBSCRIBER_ACTION_STR_QUIT);
}
return NULL;
}
#if 0
// tell the service to stop
void pubsub_quit (struct ipc_service *srv)
{
// line fmt : 0 0 0 quit
char line[BUFSIZ];
snprintf (line, BUFSIZ, "0 0 0 quit\n");
ipc_application_server_connection (srv, line, strlen (line));
}
#endif
int pubsub_connection (char **env, struct ipc_service *srv)
{
int ret = ipc_application_connection (env, srv, PUBSUBD_SERVICE_NAME);
if (ret != 0) {
handle_err ("pubsub_connection", "application_connection != 0");
}
return ret;
}
int pubsub_disconnect (struct ipc_service *srv)
{
return ipc_application_close (srv);
}
int pubsub_message_send (struct ipc_service *srv, const struct pubsub_msg * m)
{
size_t msize = 0;
char * buf = NULL;
pubsub_message_serialize (m, &buf, &msize);
struct ipc_message m_data;
memset (&m_data, 0, sizeof (struct ipc_message));
// format the connection msg
if (ipc_message_format_data (&m_data, buf, msize) < 0) {
handle_err ("pubsub_message_send", "msg_format_data");
if (buf != NULL)
free (buf);
return -1;
}
ipc_application_write (srv, &m_data);
ipc_message_empty (&m_data);
if (buf != NULL)
free(buf);
return 0;
}
int pubsub_message_recv (struct ipc_service *srv, struct pubsub_msg *m)
{
if (srv == NULL) {
handle_err ("pubsub_message_recv", "srv == NULL");
return -1;
}
if (m == NULL) {
handle_err ("pubsub_message_recv", "m == NULL");
return -1;
}
struct ipc_message m_recv;
memset (&m_recv, 0, sizeof (struct ipc_message));
ipc_application_read (srv, &m_recv);
pubsub_message_unserialize (m, m_recv.payload, m_recv.length);
ipc_message_empty (&m_recv);
return 0;
}

24
pubsub/lib/pubsub.h
View File

@ -1,24 +0,0 @@
#ifndef __PUBSUB_H__
#define __PUBSUB_H__
#include "../../core/ipc.h"
#include "message.h"
enum subscriber_action {PUBSUB_QUIT = 1, PUBSUB_PUB, PUBSUB_SUB, PUBSUB_BOTH};
#define PUBSUB_TYPE_DISCONNECT 0
#define PUBSUB_TYPE_MESSAGE 1
#define PUBSUB_TYPE_ERROR 2
#define PUBSUB_TYPE_DEBUG 4
#define PUBSUB_TYPE_INFO 5
int pubsub_connection (char **env, struct ipc_service *srv);
int pubsub_disconnect (struct ipc_service *srv);
int pubsub_message_send (struct ipc_service *srv, const struct pubsub_msg * m);
int pubsub_message_recv (struct ipc_service *srv, struct pubsub_msg *m);
// TODO
void pubsub_quit (struct ipc_service *srv);
#endif

170
pubsub/lib/pubsubd.c
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#include "../../core/communication.h"
#include "../../core/message.h"
#include "../../core/client.h"
#include "../../core/utils.h"
#include "../../core/error.h"
#include "pubsubd.h"
#include "channels.h"
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
void pubsubd_send (const struct ipc_clients *clients, const struct pubsub_msg * pubsub_msg)
{
if (clients == NULL) {
fprintf (stderr, "pubsubd_send: clients == NULL");
return;
}
if (pubsub_msg == NULL) {
fprintf (stderr, "pubsubd_send: pubsub_msg == NULL");
return;
}
char *buf = NULL;
size_t msize = 0;
pubsub_message_serialize (pubsub_msg, &buf, &msize);
struct ipc_message m;
memset (&m, 0, sizeof (struct ipc_message));
ipc_message_format_data (&m, buf, msize);
int i;
for (i = 0; i < clients->size ; i++) {
ipc_server_write (clients->clients[i], &m);
}
ipc_message_empty (&m);
if (buf != NULL) {
free (buf);
}
}
// void pubsubd_recv (struct ipc_client *p, struct pubsub_msg *m)
// {
// struct ipc_message m_data;
// memset (&m_data, 0, sizeof (struct ipc_message));
//
// // read the message from the client
// ipc_server_read (p, &m_data);
//
// pubsub_message_unserialize (m, m_data.payload, m_data.length);
//
// ipc_message_empty (&m_data);
// }
void pubsubd_main_loop (struct ipc_service *srv, struct channels *chans)
{
int i, ret = 0;
struct ipc_clients clients;
memset(&clients, 0, sizeof(struct ipc_clients));
struct ipc_clients proc_to_read;
memset(&proc_to_read, 0, sizeof(struct ipc_clients));
struct ipc_event event;
memset(&event, 0, sizeof (struct ipc_event));
event.type = IPC_EVENT_TYPE_NOT_SET;
int cpt = 0;
while(1) {
ret = ipc_service_poll_event (&clients, srv, &event);
if (ret != 0) {
handle_error("ipc_service_poll_event != 0");
// the application will shut down, and close the service
if (ipc_server_close (srv) < 0) {
handle_error("ipc_server_close < 0");
}
exit (EXIT_FAILURE);
}
switch (event.type) {
case IPC_EVENT_TYPE_CONNECTION:
{
cpt++;
struct ipc_client *cli = event.origin;
printf ("connection of client %d: %d clients connected\n", cli->proc_fd, cpt);
};
break;
case IPC_EVENT_TYPE_DISCONNECTION:
{
cpt--;
struct ipc_client *cli = event.origin;
printf ("disconnection of client %d: %d clients remaining\n", cli->proc_fd, cpt);
// TODO: to test, unsubscribe when closing
pubsubd_channels_unsubscribe_everywhere (chans, cli);
// free the ipc_client structure
free (event.origin);
};
break;
case IPC_EVENT_TYPE_MESSAGE:
{
struct ipc_message *m = event.m;
struct ipc_client *cli = event.origin;
if (m->length > 0) {
printf ("message received (type %d): %.*s\n", m->type, m->length, m->payload);
}
// TODO: handle a message
// handle_new_msg (chans, &clients, &proc_to_read);
struct pubsub_msg pubsub_msg;
memset (&pubsub_msg, 0, sizeof (struct pubsub_msg));
pubsub_message_unserialize (&pubsub_msg, m->payload, m->length);
if (pubsub_msg.type == PUBSUB_MSG_TYPE_SUB) {
printf ("client %d subscribing to %s\n"
, cli->proc_fd
, pubsub_msg.chan);
pubsubd_channels_subscribe (chans
, pubsub_msg.chan, cli);
}
if (pubsub_msg.type == PUBSUB_MSG_TYPE_UNSUB) {
printf ("client %d unsubscribing to %s\n", cli->proc_fd, pubsub_msg.chan);
pubsubd_channels_unsubscribe (chans, pubsub_msg.chan, cli);
}
if (pubsub_msg.type == PUBSUB_MSG_TYPE_PUB) {
printf ("client %d publishing to %s\n", cli->proc_fd, pubsub_msg.chan);
struct channel *chan = pubsubd_channel_search (chans, pubsub_msg.chan);
if (chan == NULL) {
handle_err ("handle_new_msg", "publish on nonexistent channel");
ipc_message_empty (m);
continue;
}
pubsubd_send (chan->subs, &pubsub_msg);
}
pubsub_message_free (&pubsub_msg);
};
break;
case IPC_EVENT_TYPE_ERROR:
{
fprintf (stderr, "a problem happened with client %d\n"
, ((struct ipc_client*) event.origin)->proc_fd);
};
break;
default :
{
fprintf (stderr, "there must be a problem, event not set\n");
};
}
}
for (i = 0; i < clients.size; i++) {
if (ipc_server_close_client (clients.clients[i]) < 0) {
handle_error( "server_close_client < 0");
}
}
pubsubd_channels_del_all (chans);
}

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pubsub/lib/pubsubd.h
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#ifndef __PUBSUBD_H__
#define __PUBSUBD_H__
// #include "../../core/pubsub.h"
#include "../../core/client.h"
#include "../../core/message.h"
#include "message.h"
#include "channels.h"
#define PUBSUBD_SERVICE_NAME "pubsubd"
void pubsubd_main_loop (struct ipc_service *srv, struct channels * chans);
void pubsubd_message_send (const struct ipc_clients *ap, const struct pubsub_msg * m);
#endif