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#include <libglouglou.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <event2/listener.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include "glougloud.h"
#define MSG_WELCOME "Welcome to glougloud\n"
struct glougloud_viz {
int pid;
struct event_base *evb;
struct modules *mods;
redisAsyncContext *rc;
struct {
struct evconnlistener *listener;
LIST_HEAD(, servtcp_cli) clients;
int clients_count;
} servtcp;
uint clients_ids_counter;
};
struct servtcp_cli {
LIST_ENTRY(servtcp_cli) entry;
int id;
struct bufferevent *bev;
struct addr addr;
};
struct glougloud *_ggd;
struct glougloud_viz *_viz;
int
_modules_load(void)
{
_viz->evb = event_base_new();
_viz->mods = modules_load(GLOUGLOUD_MOD_PATH, NULL);
return 0;
}
static void
_redis_cb_notification(redisAsyncContext *c, void *r, void *privdata)
{
redisReply *reply = r;
if (!reply)
return;
/* XXX notify modules */
log_debug("viz: redis cb_notification: %s", reply->str);
}
static void
_redis_cb_connect(const redisAsyncContext *c, int status)
{
if (status != REDIS_OK) {
log_warn("redis error: %s", c->errstr);
return;
}
log_info("viz: redis connected");
}
static void
_redis_cb_disconnect(const redisAsyncContext *c, int status)
{
if (status != REDIS_OK) {
log_warn("redis error: %s", c->errstr);
return;
}
log_info("viz: redis disconnected");
}
int
_redis_connect(void)
{
_viz->rc = redis_connect(_viz->evb,
_redis_cb_connect, _redis_cb_disconnect);
if (_viz->rc->err)
return -1;
redisAsyncCommand(_viz->rc, _redis_cb_notification, "event",
"SUBSCRIBE __keyevent@ggd__:*");
return 0;
}
void
_redis_disconnect(void)
{
redis_disconnect(_viz->rc);
_viz->rc = NULL;
}
struct servtcp_cli *
_servtcp_cli_add(struct sockaddr *sa, struct bufferevent *bev)
{
struct servtcp_cli *cli;
cli = xcalloc(1, sizeof(struct servtcp_cli));
cli->id = _viz->clients_ids_counter;
_viz->clients_ids_counter++;
cli->bev = bev;
addr_ston(sa, &cli->addr);
LIST_INSERT_HEAD(&_viz->servtcp.clients, cli, entry);
log_debug("viz: _servtcp_cli_add, cli %d %s",
cli->id, addr_ntoa(&cli->addr));
bufferevent_write(bev, MSG_WELCOME, strlen(MSG_WELCOME));
return cli;
}
void
_servtcp_cli_del(struct servtcp_cli *cli)
{
bufferevent_free(cli->bev);
LIST_REMOVE(cli, entry);
_viz->servtcp.clients_count--;
free(cli);
}
static void
_servtcp_cb_read(struct bufferevent *bev, void *user_data)
{
struct servtcp_cli *cli;
struct evbuffer *buf;
char *line;
size_t len;
cli = user_data;
buf = bufferevent_get_input(bev);
line = evbuffer_readln(buf, &len, EVBUFFER_EOL_CRLF);
log_debug("viz: _servtcp_cb_read, cli %d %s, len %d: %s",
cli->id, addr_ntoa(&cli->addr), len, line);
}
static void
_servtcp_cb_event(struct bufferevent *bev, short events, void *user_data)
{
struct servtcp_cli *cli;
cli = user_data;
if (events & BEV_EVENT_EOF) {
log_debug("viz: cli %d: connection closed", cli->id);
} else if (events & BEV_EVENT_TIMEOUT) {
log_debug("viz: cli %d: connection timeout", cli->id);
} else if (events & BEV_EVENT_ERROR) {
log_debug("viz: cli %d: connection error: %s", cli->id, strerror(errno));
}
_servtcp_cli_del(cli);
}
static void
_servtcp_cb_listener(struct evconnlistener *listener,
evutil_socket_t fd, struct sockaddr *sa, int socklen,
void *user_data)
{
struct servtcp_cli *cli;
struct bufferevent *bev;
bev = bufferevent_socket_new(_viz->evb, fd, BEV_OPT_CLOSE_ON_FREE);
if (!bev) {
log_warn("viz: error constructing bufferevent !");
return;
}
cli = _servtcp_cli_add(sa, bev);
bufferevent_setcb(bev, _servtcp_cb_read, NULL,
_servtcp_cb_event, cli);
bufferevent_enable(bev, EV_WRITE|EV_READ);
}
int
_servtcp_start(void)
{
struct evconnlistener *listener;
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
addr_ntos(&_ggd->viz.serv_ip, (struct sockaddr *)&sin);
sin.sin_port = htons(_ggd->viz.serv_port);
listener = evconnlistener_new_bind(_viz->evb,
_servtcp_cb_listener, NULL,
LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_FREE, -1,
(struct sockaddr*)&sin, sizeof(sin));
if (!listener)
return -1;
_viz->servtcp.listener = listener;
return 0;
}
void
_servtcp_stop(void)
{
struct servtcp_cli *cli, *clitmp;
if (_viz->servtcp.listener)
evconnlistener_free(_viz->servtcp.listener);
_viz->servtcp.listener = NULL;
LIST_FOREACH_SAFE(cli, &_viz->servtcp.clients, entry, clitmp)
_servtcp_cli_del(cli);
}
int
viz_init(struct glougloud *ggd)
{
_ggd = ggd;
_viz = xcalloc(1, sizeof(struct glougloud_viz));
_viz->pid = fork();
if (_viz->pid > 0)
return 0;
setprocname("viz");
droppriv(GLOUGLOUD_USER_VIZ, 1, NULL);
if (_modules_load() < 0)
goto err;
if (_redis_connect() < 0)
goto err;
if (_servtcp_start() < 0)
goto err;
event_base_dispatch(_viz->evb);
return 0;
err:
viz_shutdown();
return -1;
}
void
viz_shutdown(void) {
_redis_disconnect();
_servtcp_stop();
}
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