rtpengine/daemon/redis.c at master · Robin-Rhee/rtpengine · GitHub

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#include "redis.h"

#include <stdio.h>

#include <hiredis/hiredis.h>

#include <sys/types.h>

#include <sys/time.h>

#include <unistd.h>

#include <glib.h>

#include <stdarg.h>

#include <ctype.h>

#include <glib.h>

#include <hiredis/hiredis.h>

#include <hiredis/async.h>

#include <hiredis/adapters/libevent.h>

#include <event2/thread.h>

#include <stdlib.h>

#include <glib-object.h>

#include <json-glib/json-glib.h>

#include <inttypes.h>

#include <stdbool.h>

#include "compat.h"

#include "helpers.h"

#include "call.h"

#include "log.h"

#include "log_funcs.h"

#include "str.h"

#include "crypto.h"

#include "dtls.h"

#include "recording.h"

#include "rtplib.h"

#include "str.h"

#include "ssrc.h"

#include "main.h"

#include "codec.h"

#include "sdp.h"

typedef union {

GQueue *q;

stream_fd_q *sfds_q;

medias_arr *ma;

sfd_intf_list_q *siq;

packet_stream_q *psq;

endpoint_map_q *emq;

} callback_arg_t __attribute__ ((__transparent_union__));

struct redis *rtpe_redis;

struct redis *rtpe_redis_write;

struct redis *rtpe_redis_write_disabled;

struct redis *rtpe_redis_notify;

static __thread const ng_parser_t *redis_parser = &ng_parser_json;

static const ng_parser_t *const redis_format_parsers[__REDIS_FORMAT_MAX] = {

&ng_parser_native,

&ng_parser_json,

};

INLINE redisReply *redis_expect(int type, redisReply *r) {

if (!r)

return NULL;

if (r->type != type) {

freeReplyObject(r);

return NULL;

}

return r;

}

#if __YCM

/* format checking in YCM editor */

INLINE void redis_pipe(struct redis *r, const char *fmt, ...)

__attribute__((format(printf,2,3)));

INLINE redisReply *redis_get(struct redis *r, int type, const char *fmt, ...)

__attribute__((format(printf,3,4)));

static int redisCommandNR(redisContext *r, const char *fmt, ...)

__attribute__((format(printf,2,3)));

#define PB "%.*s"

#define PBSTR(x) (int) (x)->len, (x)->s

#define STR_R(x) (int) (x)->len, (x)->str

#define S_LEN(s,l) (int) (l), (s)

#else

#define PB "%b"

#define PBSTR(x) (x)->s, (size_t) (x)->len

#define STR_R(x) (x)->str, (size_t) (x)->len

#define S_LEN(s,l) (s), (size_t) (l)

#endif

#define REDIS_FMT(x) (int) (x)->len, (x)->str

#define rlog(l, x...) ilog(l | LOG_FLAG_RESTORE, x)

// To protect against a restore race condition: Keyspace notifications are set up

// before existing calls are restored (restore_thread). Therefore the following

// scenario is possible:

// NOTIF THREAD: receives SET, creates call

// RESTORE THREAD: executes KEYS *

// NOTIF THREAD: receives another SET:

// NOTIF THREAD: does call_destroy(), which:

// adds ports to late-release list

// RESTORE THREAD: comes across call ID, does GET

// RESTORE THREAD: creates new call

// RESTORE THREAD: wants to allocate ports, but they're still in use

// NOTIF THREAD: now does release_closed_sockets()

static mutex_t redis_ports_release_lock = MUTEX_STATIC_INIT;

static cond_t redis_ports_release_cond = COND_STATIC_INIT;

static int redis_ports_release_balance = 0; // negative = releasers, positive = allocators

static int redis_check_conn(struct redis *r);

static void json_restore_call(struct redis *r, const str *id, bool foreign);

static int redis_connect(struct redis *r, int wait, bool resolve);

static int json_build_ssrc(struct call_media *, parser_arg arg);

static void redis_do_delete(call_t *c, struct redis *r);

// mutually exclusive multi-A multi-B lock

// careful with deadlocks against redis->lock

static void redis_ports_release_push(bool inc) {

LOCK(&redis_ports_release_lock);

if (inc) {

while (redis_ports_release_balance < 0)

cond_wait(&redis_ports_release_cond, &redis_ports_release_lock);

}

else {

while (redis_ports_release_balance > 0)

cond_wait(&redis_ports_release_cond, &redis_ports_release_lock);

}

redis_ports_release_balance += (inc ? 1 : -1);

}

static void redis_ports_release_pop(bool inc) {

LOCK(&redis_ports_release_lock);

redis_ports_release_balance -= (inc ? 1 : -1);

if (redis_ports_release_balance == 0)

cond_broadcast(&redis_ports_release_cond);

}

static void redis_pipe(struct redis *r, const char *fmt, ...) {

va_list ap;

if (!r->ctx) {

ilog(LOG_ERROR, "Unable to pipe redis command. No redis context");

return;

}

va_start(ap, fmt);

redisvAppendCommand(r->ctx, fmt, ap);

va_end(ap);

r->pipeline++;

}

static redisReply *redis_get(struct redis *r, int type, const char *fmt, ...) {

va_list ap;

redisReply *ret;

if (!r->ctx) {

ilog(LOG_ERROR, "Unable to get redis reply. No redis context");

return NULL;

}

va_start(ap, fmt);

ret = redis_expect(type, redisvCommand(r->ctx, fmt, ap));

va_end(ap);

return ret;

}

static int redisCommandNR(redisContext *r, const char *fmt, ...) {

va_list ap;

redisReply *ret;

int i = 0;

if (!r) {

ilog(LOG_ERROR, "Unable to send redis command. No redis context");

return -1;

}

va_start(ap, fmt);

ret = redisvCommand(r, fmt, ap);

va_end(ap);

if (!ret)

return -1;

if (ret->type == REDIS_REPLY_ERROR) {

i = -1;

ilog(LOG_WARNING, "Redis returned error to command '%s': %s", fmt, ret->str);

}

freeReplyObject(ret);

return i;

}

/* called with r->lock held */

static int redis_check_type(struct redis *r, char *key, char *suffix, char *type) {

redisReply *rp;

if (!r->ctx) {

ilog(LOG_ERROR, "Unable to check redis reply type. No redis context");

return -1;

}

rp = redisCommand(r->ctx, "TYPE %s%s", key, suffix ? : "");

if (!rp)

return -1;

if (rp->type != REDIS_REPLY_STATUS) {

freeReplyObject(rp);

return -1;

}

if (strcmp(rp->str, type) && strcmp(rp->str, "none"))

redisCommandNR(r->ctx, "DEL %s%s", key, suffix ? : "");

freeReplyObject(rp);

return 0;

}

/* called with r->lock held */

static void redis_consume(struct redis *r) {

redisReply *rp;

if (!r->ctx) {

ilog(LOG_ERROR, "Unable to consume pipelined replies. No redis context");

r->pipeline = 0;

return;

}

while (r->pipeline) {

if (redisGetReply(r->ctx, (void **) &rp) == REDIS_OK)

freeReplyObject(rp);

r->pipeline--;

}

int redis_set_timeout(struct redis* r, int64_t timeout) {

struct timeval tv_cmd;

if (!timeout)

return 0;

tv_cmd = timeval_from_us(timeout);

if (redisSetTimeout(r->ctx, tv_cmd))

return -1;

ilog(LOG_INFO, "Setting timeout for Redis commands to %" PRId64 " milliseconds", timeout);

return 0;

}

int redis_reconnect(struct redis* r) {

int rval;

LOCK(&r->lock);

rval = redis_connect(r, 1, r->update_resolve);

if (rval)

r->state = REDIS_STATE_DISCONNECTED;

return rval;

}

// struct must be locked or single thread

static int redis_select_db(struct redis *r, int db) {

if (db == r->current_db)

return 0;

if (redisCommandNR(r->ctx, "SELECT %i", db))

return -1;

r->current_db = db;

return 0;

}

void redis_set_keepalive(int fd) {

if (rtpe_config.redis_tcp_keepalive_time > 0) {

int keepalive_en = 1;

setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &keepalive_en, sizeof(keepalive_en));

setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &rtpe_config.redis_tcp_keepalive_time,

sizeof(rtpe_config.redis_tcp_keepalive_time));

setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &rtpe_config.redis_tcp_keepalive_intvl,

sizeof(rtpe_config.redis_tcp_keepalive_intvl));

setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &rtpe_config.redis_tcp_keepalive_probes,

sizeof(rtpe_config.redis_tcp_keepalive_probes));

}

/* called with r->lock held if necessary */

static int redis_connect(struct redis *r, int wait, bool resolve) {

struct timeval tv;

redisReply *rp;

char *s;

int64_t cmd_timeout, connect_timeout;

sockaddr_t a;

if (r->ctx)

redisFree(r->ctx);

r->ctx = NULL;

r->current_db = -1;

connect_timeout = atomic_get_na(&rtpe_config.redis_connect_timeout) * 1000LL;

cmd_timeout = atomic_get_na(&rtpe_config.redis_cmd_timeout) * 1000LL;

tv = timeval_from_us(connect_timeout);

/* re-resolve if asked */

if (resolve && r->hostname) {

if (!sockaddr_getaddrinfo(&a, r->hostname))

ilog(LOG_WARN, "Failed to re-resolve remote server hostname: '%s'. Just use older one: '%s'.",

r->hostname, r->host);

else {

sockaddr_print(&a, r->host, sizeof(r->host));

r->endpoint.address = a;

}

r->ctx = redisConnectWithTimeout(r->host, r->endpoint.port, tv);

if (!r->ctx)

goto err;

if (r->ctx->err)

goto err2;

redis_set_keepalive(r->ctx->fd);

if (redis_set_timeout(r, cmd_timeout))

goto err2;

if (r->auth) {

if (redisCommandNR(r->ctx, "AUTH %s", r->auth))

goto err2;

}

else {

if (redisCommandNR(r->ctx, "PING"))

goto err2;

}

if (redis_select_db(r, r->db))

goto err2;

while (wait-- >= 0) {

ilog(LOG_INFO, "Asking Redis whether it's master or slave...");

rp = redisCommand(r->ctx, "INFO");

if (!rp) {

goto err2;

}

s = strstr(rp->str, "role:");

if (!s) {

goto err3;

}

if (!memcmp(s, "role:master", 11) || !memcmp(s, "role:active-replica", 19)) {

if (r->role == MASTER_REDIS_ROLE || r->role == ANY_REDIS_ROLE) {

ilog(LOG_INFO, "Connected to Redis %s in master mode",

endpoint_print_buf(&r->endpoint));

goto done;

} else if (r->role == SLAVE_REDIS_ROLE) {

ilog(LOG_INFO, "Connected to Redis %s in master mode, but wanted mode is slave; retrying...",

endpoint_print_buf(&r->endpoint));

goto next;

}

} else if (!memcmp(s, "role:slave", 10)) {

if (r->role == SLAVE_REDIS_ROLE || r->role == ANY_REDIS_ROLE) {

ilog(LOG_INFO, "Connected to Redis %s in slave mode",

endpoint_print_buf(&r->endpoint));

goto done;

} else if (r->role == MASTER_REDIS_ROLE) {

ilog(LOG_INFO, "Connected to Redis %s in slave mode, but wanted mode is master; retrying...",

endpoint_print_buf(&r->endpoint));

goto next;

}

} else {

goto err3;

}

freeReplyObject(rp);

usleep(1000000);

}

goto err2;

done:

freeReplyObject(rp);

redis_check_type(r, "calls", NULL, "set");

return 0;

err3:

freeReplyObject(rp);

err2:

if (r->ctx->err) {

rlog(LOG_ERR, "Failed to connect to Redis %s, error: %s",

endpoint_print_buf(&r->endpoint), r->ctx->errstr);

return -1;

}

redisFree(r->ctx);

r->ctx = NULL;

err:

rlog(LOG_ERR, "Failed to connect to Redis %s",

endpoint_print_buf(&r->endpoint));

return -1;

}

void on_redis_notification(redisAsyncContext *actx, void *reply, void *privdata) {

struct redis *r = 0;

call_t *c = NULL;

str callid;

str keyspace_id;

if (!rtpe_redis_notify) {

rlog(LOG_ERROR, "A redis notification has been received but no redis_notify database found");

return;

}

r = rtpe_redis_notify;

mutex_lock(&r->lock);

redisReply *rr = (redisReply*)reply;

if (reply == NULL || rr->type != REDIS_REPLY_ARRAY)

goto err;

for (int j = 0; j < rr->elements; j++) {

rlog(LOG_DEBUG, "Redis-Notify: %u) %s%s%s\n", j, FMT_M(rr->element[j]->str));

}

if (rr->elements != 4)

goto err;

// format: __keyspace@<db>__:<key>

keyspace_id = STR_LEN(rr->element[2]->str, rr->element[2]->len);

if (str_shift_cmp(&keyspace_id, "__keyspace@"))

goto err;

// extract <db>

char *endp;

r->db = strtoul(keyspace_id.s, &endp, 10);

if (endp == keyspace_id.s || *endp != '_')

goto err;

if (str_shift(&keyspace_id, endp - keyspace_id.s + 3))

goto err;

if (keyspace_id.s[-1] != ':')

goto err;

// now at <key>

callid = keyspace_id;

if (redis_check_conn(r) == REDIS_STATE_DISCONNECTED)

goto err;

// select the right db for restoring the call

if (redis_select_db(r, r->db)) {

if (r->ctx && r->ctx->err)

rlog(LOG_ERROR, "Redis error: %s", r->ctx->errstr);

redisFree(r->ctx);

r->ctx = NULL;

goto err;

}

if (strncmp(rr->element[3]->str, "set", 3) == 0) {

c = call_get(&callid);

if (c) {

rwlock_unlock_w(&c->master_lock);

if (IS_FOREIGN_CALL(c)) {

c->redis_hosted_db = rtpe_redis_write->db; // don't delete from foreign DB

// redis_notify->lock is held

redis_ports_release_push(true);

redis_do_delete(c, rtpe_redis_write);

call_destroy(c);

release_closed_sockets();

redis_ports_release_pop(true);

}

else {

rlog(LOG_WARN, "Redis-Notifier: Ignoring SET received for OWN call: " STR_FORMAT "\n", STR_FMT(&callid));

goto err;

}

redis_select_db(r, r->db);

mutex_unlock(&r->lock);

// unlock before restoring calls to avoid deadlock in case err happens

json_restore_call(r, &callid, true);

mutex_lock(&r->lock);

}

if (strncmp(rr->element[3]->str, "del", 3) == 0) {

c = call_get(&callid);

if (!c) {

rlog(LOG_NOTICE, "Redis-Notifier: DEL did not find call with callid: " STR_FORMAT "\n", STR_FMT(&callid));

goto err;

}

rwlock_unlock_w(&c->master_lock);

if (!IS_FOREIGN_CALL(c)) {

rlog(LOG_WARN, "Redis-Notifier: Ignoring DEL received for an OWN call: " STR_FORMAT "\n", STR_FMT(&callid));

goto err;

}

// redis_notify->lock is held

redis_ports_release_push(true);

call_destroy(c);

release_closed_sockets();

redis_ports_release_pop(true);

}

err:

if (c) // because of call_get(..)

obj_put(c);

mutex_unlock(&r->lock);

release_closed_sockets();

log_info_reset();

}

void redis_delete_async_context_connect(const redisAsyncContext *redis_delete_async_context, int status) {

if (status == REDIS_ERR) {

rtpe_redis_write->async_ctx = NULL;

if (redis_delete_async_context->errstr) {

rlog(LOG_ERROR, "redis_delete_async_context_connect error %d: %s",

redis_delete_async_context->err, redis_delete_async_context->errstr);

} else {

rlog(LOG_ERROR, "redis_delete_async_context_connect error %d: no errstr",

redis_delete_async_context->err);

}

} else if (status == REDIS_OK) {

rlog(LOG_NOTICE, "redis_delete_async_context_connect initiated by user");

} else {

rlog(LOG_ERROR, "redis_delete_async_context_connect invalid status code %d", status);

}

void redis_delete_async_context_disconnect(const redisAsyncContext *redis_delete_async_context, int status) {

rtpe_redis_write->async_ctx = NULL;

if (status == REDIS_ERR) {

if (redis_delete_async_context->errstr) {

rlog(LOG_ERROR, "redis_delete_async_context_disconnect error %d: %s",

redis_delete_async_context->err, redis_delete_async_context->errstr);

} else {

rlog(LOG_ERROR, "redis_delete_async_context_disconnect error %d: no errstr",

redis_delete_async_context->err);

}

} else if (status == REDIS_OK) {

rlog(LOG_NOTICE, "redis_delete_async_context_disconnect initiated by user");

} else {

rlog(LOG_ERROR, "redis_delete_async_context_disconnect invalid status code %d", status);

}

void redis_notify_async_context_disconnect(const redisAsyncContext *redis_notify_async_context, int status) {

if (status == REDIS_ERR) {

if (redis_notify_async_context->errstr) {

rlog(LOG_ERROR, "redis_notify_async_context_disconnect error %d on context free: %s",

redis_notify_async_context->err, redis_notify_async_context->errstr);

} else {

rlog(LOG_ERROR, "redis_notify_async_context_disconnect error %d on context free: no errstr",

redis_notify_async_context->err);

}

} else if (status == REDIS_OK) {

rlog(LOG_NOTICE, "redis_notify_async_context_disconnect initiated by user");

} else {

rlog(LOG_ERROR, "redis_notify_async_context_disconnect invalid status code %d", status);

}

// connect_cb = connect callback, disconnect_cb = disconnect callback

int redis_async_context_alloc(struct redis *r, void *connect_cb, void *disconnect_cb) {

// sanity checks

if (!r) {

rlog(LOG_ERROR, "redis_async_context_alloc: NULL r");

return -1;

} else {

rlog(LOG_DEBUG, "redis_async_context_alloc: Use Redis %s", endpoint_print_buf(&r->endpoint));

}

// alloc async context

r->async_ctx = redisAsyncConnect(r->host, r->endpoint.port);

if (!r->async_ctx) {

rlog(LOG_ERROR, "redis_async_context_alloc: can't create new");

return -1;

}

if (r->async_ctx->err) {

rlog(LOG_ERROR, "redis_async_context_alloc: can't create new error: %s", r->async_ctx->errstr);

return -1;

}

redis_set_keepalive(r->async_ctx->c.fd);

// callbacks async context

if (redisAsyncSetConnectCallback(r->async_ctx, connect_cb) != REDIS_OK) {

rlog(LOG_ERROR, "redis_async_context_alloc: can't set connect callback");

return -1;

}

if (redisAsyncSetDisconnectCallback(r->async_ctx, disconnect_cb) != REDIS_OK) {

rlog(LOG_ERROR, "redis_async_context_alloc: can't set disconnect callback");

return -1;

}

rlog(LOG_DEBUG, "redis_async_context_alloc: Success");

return 0;

}

int redis_async_event_base_action(struct redis *r, enum event_base_action action) {

// sanity checks

if (!r) {

rlog(LOG_ERR, "redis_async_event_base_action: NULL r");

return -1;

} else {

rlog(LOG_DEBUG, "redis_async_event_base_action: Use Redis %s", endpoint_print_buf(&r->endpoint));

}

if (!r->async_ev && action != EVENT_BASE_ALLOC) {

rlog(LOG_NOTICE, "redis_async_event_base_action: async_ev is NULL on event base action %d", action);

return -1;

}

// exec event base action

switch (action) {

case EVENT_BASE_ALLOC:

r->async_ev = event_base_new();

if (!r->async_ev) {

rlog(LOG_ERROR, "redis_async_event_base_action: Fail alloc async_ev");

return -1;

} else {

rlog(LOG_DEBUG, "redis_async_event_base_action: Success alloc async_ev");

}

break;

case EVENT_BASE_FREE:

event_base_free(r->async_ev);

rlog(LOG_DEBUG, "redis_async_event_base_action: Success free async_ev");

break;

case EVENT_BASE_LOOPBREAK:

if (event_base_loopbreak(r->async_ev)) {

rlog(LOG_ERROR, "redis_async_event_base_action: Fail loopbreak async_ev");

return -1;

} else {

rlog(LOG_DEBUG, "redis_async_event_base_action: Success loopbreak async_ev");

}

break;

default:

rlog(LOG_ERROR, "redis_async_event_base_action: No event base action found: %d", action);

return -1;

}

return 0;

}

int redis_notify_subscribe_action(struct redis *r, enum subscribe_action action, int keyspace) {

if (!r->async_ctx) {

rlog(LOG_ERROR, "redis_notify_async_context is NULL on subscribe action");

return -1;

}

if (r->async_ctx->err) {

rlog(LOG_ERROR, "redis_notify_async_context error on subscribe action: %s", r->async_ctx->errstr);

return -1;

}

switch (action) {

case SUBSCRIBE_KEYSPACE:

if (redisAsyncCommand(r->async_ctx, on_redis_notification, NULL, "psubscribe __keyspace@%i__:*", keyspace) != REDIS_OK) {

rlog(LOG_ERROR, "Fail redisAsyncCommand on JSON SUBSCRIBE_KEYSPACE");

return -1;

}

break;

case UNSUBSCRIBE_KEYSPACE:

if (redisAsyncCommand(r->async_ctx, on_redis_notification, NULL, "punsubscribe __keyspace@%i__:*", keyspace) != REDIS_OK) {

rlog(LOG_ERROR, "Fail redisAsyncCommand on JSON UNSUBSCRIBE_KEYSPACE");

return -1;

}

break;

case UNSUBSCRIBE_ALL:

if (redisAsyncCommand(r->async_ctx, on_redis_notification, NULL, "punsubscribe") != REDIS_OK) {

rlog(LOG_ERROR, "Fail redisAsyncCommand on JSON UNSUBSCRIBE_ALL");

return -1;

}

break;

default:

rlog(LOG_ERROR, "No subscribe action found: %d", action);

return -1;

}

return 0;

}

static int redis_delete_async(struct redis *r) {

// sanity checks

if (!r) {

rlog(LOG_ERROR, "redis_delete_async: Don't use Redis async deletions because no redis/redis_write.");

return -1 ;

}

// alloc new redis async context

if (r->async_ctx == NULL && redis_async_context_alloc(r, redis_delete_async_context_connect, redis_delete_async_context_disconnect) < 0) {

r->async_ctx = NULL;

rlog(LOG_ERROR, "redis_delete_async: Failed to alloc async_ctx");

return -1;

}

// attach event base

if (redisLibeventAttach(r->async_ctx, r->async_ev) == REDIS_ERR) {

if (r->async_ctx->err) {

rlog(LOG_ERROR, "redis_delete_async: redis_delete_async_context can't attach event base error: %s", r->async_ctx->errstr);

} else {

rlog(LOG_ERROR, "redis_delete_async: redis_delete_async_context can't attach event base");

}

return -1;

}

// commands

if (r->auth) {

if (redisAsyncCommand(r->async_ctx, NULL, NULL, "AUTH %s", r->auth) != REDIS_OK) {

rlog(LOG_ERROR, "redis_delete_async: Fail redisAsyncCommand on AUTH");

return -1;

}

} else {

if (redisAsyncCommand(r->async_ctx, NULL, NULL, "PING") != REDIS_OK) {

rlog(LOG_ERROR, "redis_delete_async: Fail redisAsyncCommand on PING");

return -1;

}

// delete commands

gchar *redis_command;

gint redis_command_total = 0;

mutex_lock(&r->async_lock);

while (!g_queue_is_empty(&r->async_queue)) {

redis_command_total++;

redis_command = g_queue_pop_head(&r->async_queue);

if (redisAsyncCommand(r->async_ctx, NULL, NULL, redis_command) != REDIS_OK) {

rlog(LOG_ERROR, "redis_delete_async: Fail redisAsyncCommand on DELETE");

}

g_free(redis_command);

}

mutex_unlock(&r->async_lock);

rlog(LOG_NOTICE, "redis_delete_async: Queued DELETE redisAsyncCommand total: %d", redis_command_total);

// dispatch event base => thread blocks here

if (event_base_dispatch(r->async_ev) < 0) {

rlog(LOG_ERROR, "redis_delete_async: Fail event_base_dispatch()");

return -1;

}

// loopbreak

redisAsyncDisconnect(r->async_ctx);

r->async_ctx = NULL;

return 0;

}

static int redis_notify(struct redis *r) {

GList *l;

if (!r) {

rlog(LOG_ERROR, "redis_notify database is NULL on redis_notify()");

return -1;

}

if (!r->async_ctx) {

rlog(LOG_ERROR, "redis_notify_async_context is NULL on redis_notify()");

return -1;

}

if (!r->async_ev) {

rlog(LOG_ERROR, "redis_notify_event_base is NULL on redis_notify()");

return -1;

}

// get redis_notify database

rlog(LOG_INFO, "Use Redis %s to subscribe to notifications", endpoint_print_buf(&r->endpoint));

// attach event base

if (redisLibeventAttach(r->async_ctx, r->async_ev) == REDIS_ERR) {

if (r->async_ctx->err) {

rlog(LOG_ERROR, "redis_notify_async_context can't attach event base error: %s", r->async_ctx->errstr);

} else {

rlog(LOG_ERROR, "redis_notify_async_context can't attach event base");

}

return -1;

}

if (r->auth) {

if (redisAsyncCommand(r->async_ctx, on_redis_notification, NULL, "AUTH %s", r->auth) != REDIS_OK) {

rlog(LOG_ERROR, "Fail redisAsyncCommand on AUTH");

return -1;

}

// subscribe to the values in the configured keyspaces

rwlock_lock_r(&rtpe_config.keyspaces_lock);

for (l = rtpe_config.redis_subscribed_keyspaces.head; l; l = l->next) {

int id = GPOINTER_TO_INT(l->data);

if (id < 0)

continue;

redis_notify_subscribe_action(r, SUBSCRIBE_KEYSPACE, id);

}

rwlock_unlock_r(&rtpe_config.keyspaces_lock);

// dispatch event base => thread blocks here

if (event_base_dispatch(r->async_ev) < 0) {

rlog(LOG_ERROR, "Fail event_base_dispatch()");

return -1;

}

return 0;

}

void redis_delete_async_loop(void *d) {

struct redis *r = NULL;

// sanity checks

r = rtpe_redis_write;

if (!r) {

rlog(LOG_ERROR, "redis_delete_async_loop: Don't use Redis async deletions because no redis/redis_write.");

return ;

}

r->async_last = rtpe_now;

// init libevent for pthread usage

if (evthread_use_pthreads() < 0) {

ilog(LOG_ERROR, "redis_delete_async_loop: evthread_use_pthreads failed.");

return ;

}

// alloc libevent base

if (redis_async_event_base_action(r, EVENT_BASE_ALLOC) < 0) {

rlog(LOG_ERROR, "redis_delete_async_loop: Failed to EVENT_BASE_ALLOC.");

return ;

}

// loop (almost) forever

while (!rtpe_shutdown) {

redis_delete_async(r);

sleep(1);

}

void redis_notify_loop(void *d) {

int redis_notify_return = 0;

const int64_t microseconds = 1000000L;

int64_t next_run = rtpe_now;

struct redis *r;

r = rtpe_redis_notify;

if (!r) {

rlog(LOG_ERROR, "Don't use Redis notifications. See --redis-notifications parameter.");

return ;

}

// init libevent for pthread usage

if (evthread_use_pthreads() < 0) {

ilog(LOG_ERROR, "evthread_use_pthreads failed");

return ;

}

// alloc redis async context

if (redis_async_context_alloc(r, NULL, redis_notify_async_context_disconnect) < 0) {

return ;

}

// alloc event base

if (redis_async_event_base_action(r, EVENT_BASE_ALLOC) < 0) {

return ;

}

// initial redis_notify

if (redis_check_conn(r) == REDIS_STATE_CONNECTED) {

redis_notify_return = redis_notify(r);

}

// loop redis_notify => in case of lost connection

while (!rtpe_shutdown) {

rtpe_now = now_us();

if (rtpe_now < next_run) {

usleep(100000);

continue;

}

next_run = rtpe_now + microseconds;

if (redis_check_conn(r) == REDIS_STATE_CONNECTED || redis_notify_return < 0) {

r->async_ctx = NULL;

// alloc new redis async context upon redis breakdown

if (redis_async_context_alloc(r, NULL, redis_notify_async_context_disconnect) < 0) {

continue;

}

// prepare notifications

redis_notify_return = redis_notify(r);

}

if (r->state == REDIS_STATE_CONNECTED) {

// unsubscribe notifications

redis_notify_subscribe_action(r, UNSUBSCRIBE_ALL, 0);

// free async context

redisAsyncDisconnect(r->async_ctx);

r->async_ctx = NULL;

}

struct redis *redis_new(const endpoint_t *ep, int db, const char *hostname, const char *auth,

enum redis_role role, int no_redis_required, bool update_resolve) {

struct redis *r;

r = g_new0(struct redis, 1);

r->endpoint = *ep;

sockaddr_print(&ep->address, r->host, sizeof(r->host));

r->db = db;

r->auth = auth;

r->hostname = hostname;

r->role = role;

r->state = REDIS_STATE_DISCONNECTED;

r->no_redis_required = no_redis_required;

r->restore_tick_us = 0;

r->consecutive_errors = 0;

r->update_resolve = update_resolve;

mutex_init(&r->lock);

if (redis_connect(r, 10, false)) {

if (r->no_redis_required) {

rlog(LOG_WARN, "Starting with no initial connection to Redis %s !",

endpoint_print_buf(&r->endpoint));

return r;

}

goto err;

}

// redis is connected

rlog(LOG_INFO, "Established initial connection to Redis %s",

endpoint_print_buf(&r->endpoint));

r->state = REDIS_STATE_CONNECTED;

return r;

err:

mutex_destroy(&r->lock);

g_free(r);

return NULL;

}

struct redis *redis_dup(const struct redis *r, int db) {

return redis_new(&r->endpoint,

(db >= 0 ? db : r->db),

r->hostname,

r->auth,

r->role,

r->no_redis_required,

r->update_resolve);

}

void redis_close(struct redis *r) {

if (!r)

return;

if (r->ctx)

redisFree(r->ctx);

r->ctx = NULL;

mutex_destroy(&r->lock);

g_free(r);

}

static void redis_count_err_and_disable(struct redis *r)

{

int allowed_errors;

int64_t disable_time_us;

allowed_errors = atomic_get_na(&rtpe_config.redis_allowed_errors);

disable_time_us = atomic_get_na(&rtpe_config.redis_disable_time_us);

if (allowed_errors < 0) {

return;

}

r->consecutive_errors++;

if (r->consecutive_errors > allowed_errors) {

r->restore_tick_us = rtpe_now + disable_time_us;

ilog(LOG_WARNING, "Redis server %s disabled for %" PRId64 " seconds",

endpoint_print_buf(&r->endpoint),

disable_time_us / 1000000L);

}

/* must be called with r->lock held */

static int redis_check_conn(struct redis *r) {

rtpe_now = now_us(); // XXX this needed here?

if ((r->state == REDIS_STATE_DISCONNECTED) && r->restore_tick_us > rtpe_now) {

ilog(LOG_WARNING, "Redis server '%s' is disabled. Don't try RE-Establishing for %" PRId64 " more seconds",

View remainder of file in raw view

rtpengine/daemon/redis.c at master · Robin-Rhee/rtpengine · GitHub

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