Redis 2.6.4

[redis.git] / src / sentinel.c

diff --git a/src/sentinel.c b/src/sentinel.c
index d5ffa6f7e2cbdd9617c873f324cb0ce03a01be36..d8a960713f0f8e829188cb099318ed9b2412d50c 100644 (file)
--- a/src/sentinel.c
+++ b/src/sentinel.c
@@ -1,5 +1,4 @@
 /* Redis Sentinel implementation
 /* Redis Sentinel implementation

- * -----------------------------

  *
  * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
  * All rights reserved.
  *
  * Copyright (c) 2009-2012, Salvatore Sanfilippo <antirez at gmail dot com>
  * All rights reserved.


@@ -162,6 +161,7 @@ typedef struct sentinelRedisInstance {
     dict *slaves;       /* Slaves for this master instance. */
     int quorum;         /* Number of sentinels that need to agree on failure. */
     int parallel_syncs; /* How many slaves to reconfigure at same time. */
     dict *slaves;       /* Slaves for this master instance. */
     int quorum;         /* Number of sentinels that need to agree on failure. */
     int parallel_syncs; /* How many slaves to reconfigure at same time. */

+    char *auth_pass;    /* Password to use for AUTH against master & slaves. */

 
     /* Slave specific. */
     mstime_t master_link_down_time; /* Slave replication link down time. */
 
     /* Slave specific. */
     mstime_t master_link_down_time; /* Slave replication link down time. */


@@ -326,6 +326,7 @@ void sentinelEvent(int level, char *type, sentinelRedisInstance *ri, const char
 sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master);
 void sentinelScheduleScriptExecution(char *path, ...);
 void sentinelStartFailover(sentinelRedisInstance *master, int state);
 sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master);
 void sentinelScheduleScriptExecution(char *path, ...);
 void sentinelStartFailover(sentinelRedisInstance *master, int state);

+void sentinelDiscardReplyCallback(redisAsyncContext *c, void *reply, void *privdata);

 
 /* ========================= Dictionary types =============================== */
 
 
 /* ========================= Dictionary types =============================== */
 


@@ -366,6 +367,7 @@ dictType leaderVotesDictType = {
 /* =========================== Initialization =============================== */
 
 void sentinelCommand(redisClient *c);
 /* =========================== Initialization =============================== */
 
 void sentinelCommand(redisClient *c);

+void sentinelInfoCommand(redisClient *c);

 
 struct redisCommand sentinelcmds[] = {
     {"ping",pingCommand,1,"",0,NULL,0,0,0,0,0},
 
 struct redisCommand sentinelcmds[] = {
     {"ping",pingCommand,1,"",0,NULL,0,0,0,0,0},


@@ -373,7 +375,8 @@ struct redisCommand sentinelcmds[] = {
     {"subscribe",subscribeCommand,-2,"",0,NULL,0,0,0,0,0},
     {"unsubscribe",unsubscribeCommand,-1,"",0,NULL,0,0,0,0,0},
     {"psubscribe",psubscribeCommand,-2,"",0,NULL,0,0,0,0,0},
     {"subscribe",subscribeCommand,-2,"",0,NULL,0,0,0,0,0},
     {"unsubscribe",unsubscribeCommand,-1,"",0,NULL,0,0,0,0,0},
     {"psubscribe",psubscribeCommand,-2,"",0,NULL,0,0,0,0,0},

-    {"punsubscribe",punsubscribeCommand,-1,"",0,NULL,0,0,0,0,0}
+    {"punsubscribe",punsubscribeCommand,-1,"",0,NULL,0,0,0,0,0},
+    {"info",sentinelInfoCommand,-1,"",0,NULL,0,0,0,0,0}

 };
 
 /* This function overwrites a few normal Redis config default with Sentinel
 };
 
 /* This function overwrites a few normal Redis config default with Sentinel


@@ -872,6 +875,7 @@ sentinelRedisInstance *createSentinelRedisInstance(char *name, int flags, char *
     ri->down_after_period = master ? master->down_after_period :
                             SENTINEL_DOWN_AFTER_PERIOD;
     ri->master_link_down_time = 0;
     ri->down_after_period = master ? master->down_after_period :
                             SENTINEL_DOWN_AFTER_PERIOD;
     ri->master_link_down_time = 0;

+    ri->auth_pass = NULL;

     ri->slave_priority = SENTINEL_DEFAULT_SLAVE_PRIORITY;
     ri->slave_reconf_sent_time = 0;
     ri->slave_master_host = NULL;
     ri->slave_priority = SENTINEL_DEFAULT_SLAVE_PRIORITY;
     ri->slave_reconf_sent_time = 0;
     ri->slave_master_host = NULL;


@@ -919,6 +923,7 @@ void releaseSentinelRedisInstance(sentinelRedisInstance *ri) {
     sdsfree(ri->client_reconfig_script);
     sdsfree(ri->slave_master_host);
     sdsfree(ri->leader);
     sdsfree(ri->client_reconfig_script);
     sdsfree(ri->slave_master_host);
     sdsfree(ri->leader);

+    sdsfree(ri->auth_pass);

     releaseSentinelAddr(ri->addr);
 
     /* Clear state into the master if needed. */
     releaseSentinelAddr(ri->addr);
 
     /* Clear state into the master if needed. */


@@ -1203,6 +1208,11 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
             return "Client reconfiguration script seems non existing or "
                    "non executable.";
         ri->client_reconfig_script = sdsnew(argv[2]);
             return "Client reconfiguration script seems non existing or "
                    "non executable.";
         ri->client_reconfig_script = sdsnew(argv[2]);

+   } else if (!strcasecmp(argv[0],"auth-pass") && argc == 3) {
+        /* auth-pass <name> <password> */
+        ri = sentinelGetMasterByName(argv[1]);
+        if (!ri) return "No such master with specified name.";
+        ri->auth_pass = sdsnew(argv[2]);

     } else {
         return "Unrecognized sentinel configuration statement.";
     }
     } else {
         return "Unrecognized sentinel configuration statement.";
     }


@@ -1261,6 +1271,21 @@ void sentinelDisconnectCallback(const redisAsyncContext *c, int status) {
     sentinelDisconnectInstanceFromContext(c);
 }
 
     sentinelDisconnectInstanceFromContext(c);
 }
 

+/* Send the AUTH command with the specified master password if needed.
+ * Note that for slaves the password set for the master is used.
+ *
+ * We don't check at all if the command was successfully transmitted
+ * to the instance as if it fails Sentinel will detect the instance down,
+ * will disconnect and reconnect the link and so forth. */
+void sentinelSendAuthIfNeeded(sentinelRedisInstance *ri, redisAsyncContext *c) {
+    char *auth_pass = (ri->flags & SRI_MASTER) ? ri->auth_pass :
+                                                 ri->master->auth_pass;
+
+    if (auth_pass)
+        redisAsyncCommand(c, sentinelDiscardReplyCallback, NULL, "AUTH %s",
+            auth_pass);
+}
+

 /* Create the async connections for the specified instance if the instance
  * is disconnected. Note that the SRI_DISCONNECTED flag is set even if just
  * one of the two links (commands and pub/sub) is missing. */
 /* Create the async connections for the specified instance if the instance
  * is disconnected. Note that the SRI_DISCONNECTED flag is set even if just
  * one of the two links (commands and pub/sub) is missing. */


@@ -1282,6 +1307,7 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
                                             sentinelLinkEstablishedCallback);
             redisAsyncSetDisconnectCallback(ri->cc,
                                             sentinelDisconnectCallback);
                                             sentinelLinkEstablishedCallback);
             redisAsyncSetDisconnectCallback(ri->cc,
                                             sentinelDisconnectCallback);

+            sentinelSendAuthIfNeeded(ri,ri->cc);

         }
     }
     /* Pub / Sub */
         }
     }
     /* Pub / Sub */


@@ -1301,6 +1327,7 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
                                             sentinelLinkEstablishedCallback);
             redisAsyncSetDisconnectCallback(ri->pc,
                                             sentinelDisconnectCallback);
                                             sentinelLinkEstablishedCallback);
             redisAsyncSetDisconnectCallback(ri->pc,
                                             sentinelDisconnectCallback);

+            sentinelSendAuthIfNeeded(ri,ri->pc);

             /* Now we subscribe to the Sentinels "Hello" channel. */
             retval = redisAsyncCommand(ri->pc,
                 sentinelReceiveHelloMessages, NULL, "SUBSCRIBE %s",
             /* Now we subscribe to the Sentinels "Hello" channel. */
             retval = redisAsyncCommand(ri->pc,
                 sentinelReceiveHelloMessages, NULL, "SUBSCRIBE %s",


@@ -1424,7 +1451,7 @@ void sentinelRefreshInstanceInfo(sentinelRedisInstance *ri, const char *info) {
 
     /* Act if a master turned into a slave. */
     if ((ri->flags & SRI_MASTER) && role == SRI_SLAVE) {
 
     /* Act if a master turned into a slave. */
     if ((ri->flags & SRI_MASTER) && role == SRI_SLAVE) {

-        if (first_runid && ri->slave_master_host) {
+        if ((first_runid || runid_changed) && ri->slave_master_host) {

             /* If it is the first time we receive INFO from it, but it's
              * a slave while it was configured as a master, we want to monitor
              * its master instead. */
             /* If it is the first time we receive INFO from it, but it's
              * a slave while it was configured as a master, we want to monitor
              * its master instead. */


@@ -1443,7 +1470,7 @@ void sentinelRefreshInstanceInfo(sentinelRedisInstance *ri, const char *info) {
         if (!(ri->master->flags & SRI_FAILOVER_IN_PROGRESS) &&
             (runid_changed || first_runid))
         {
         if (!(ri->master->flags & SRI_FAILOVER_IN_PROGRESS) &&
             (runid_changed || first_runid))
         {

-            /* If a slave turned into maser but:
+            /* If a slave turned into master but:

              *
              * 1) Failover not in progress.
              * 2) RunID hs changed, or its the first time we see an INFO output.
              *
              * 1) Failover not in progress.
              * 2) RunID hs changed, or its the first time we see an INFO output.


@@ -2003,6 +2030,8 @@ void sentinelCommand(redisClient *c) {
         ri = sentinelGetMasterByName(c->argv[2]->ptr);
         if (ri == NULL) {
             addReply(c,shared.nullmultibulk);
         ri = sentinelGetMasterByName(c->argv[2]->ptr);
         if (ri == NULL) {
             addReply(c,shared.nullmultibulk);

+        } else if (ri->info_refresh == 0) {
+            addReplySds(c,sdsnew("-IDONTKNOW I have not enough information to reply. Please ask another Sentinel.\r\n"));

         } else {
             sentinelAddr *addr = ri->addr;
 
         } else {
             sentinelAddr *addr = ri->addr;
 


@@ -2046,6 +2075,65 @@ numargserr:
                           (char*)c->argv[1]->ptr);
 }
 
                           (char*)c->argv[1]->ptr);
 }
 

+void sentinelInfoCommand(redisClient *c) {
+    char *section = c->argc == 2 ? c->argv[1]->ptr : "default";
+    sds info = sdsempty();
+    int defsections = !strcasecmp(section,"default");
+    int sections = 0;
+
+    if (c->argc > 2) {
+        addReply(c,shared.syntaxerr);
+        return;
+    }
+
+    if (!strcasecmp(section,"server") || defsections) {
+        if (sections++) info = sdscat(info,"\r\n");
+        sds serversection = genRedisInfoString("server");
+        info = sdscatlen(info,serversection,sdslen(serversection));
+        sdsfree(serversection);
+    }
+
+    if (!strcasecmp(section,"sentinel") || defsections) {
+        dictIterator *di;
+        dictEntry *de;
+        int master_id = 0;
+
+        if (sections++) info = sdscat(info,"\r\n");
+        info = sdscatprintf(info,
+            "# Sentinel\r\n"
+            "sentinel_masters:%lu\r\n"
+            "sentinel_tilt:%d\r\n"
+            "sentinel_running_scripts:%d\r\n"
+            "sentinel_scripts_queue_length:%ld\r\n",
+            dictSize(sentinel.masters),
+            sentinel.tilt,
+            sentinel.running_scripts,
+            listLength(sentinel.scripts_queue));
+
+        di = dictGetIterator(sentinel.masters);
+        while((de = dictNext(di)) != NULL) {
+            sentinelRedisInstance *ri = dictGetVal(de);
+            char *status = "ok";
+
+            if (ri->flags & SRI_O_DOWN) status = "odown";
+            else if (ri->flags & SRI_S_DOWN) status = "sdown";
+            info = sdscatprintf(info,
+                "master%d:name=%s,status=%s,address=%s:%d,"
+                "slaves=%lu,sentinels=%lu\r\n",
+                master_id++, ri->name, status,
+                ri->addr->ip, ri->addr->port,
+                dictSize(ri->slaves),
+                dictSize(ri->sentinels)+1);
+        }
+        dictReleaseIterator(di);
+    }
+
+    addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",
+        (unsigned long)sdslen(info)));
+    addReplySds(c,info);
+    addReply(c,shared.crlf);
+}
+

 /* ===================== SENTINEL availability checks ======================= */
 
 /* Is this instance down from our point of view? */
 /* ===================== SENTINEL availability checks ======================= */
 
 /* Is this instance down from our point of view? */


@@ -2460,9 +2548,21 @@ void sentinelStartFailoverIfNeeded(sentinelRedisInstance *master) {
 int compareSlavesForPromotion(const void *a, const void *b) {
     sentinelRedisInstance **sa = (sentinelRedisInstance **)a,
                           **sb = (sentinelRedisInstance **)b;
 int compareSlavesForPromotion(const void *a, const void *b) {
     sentinelRedisInstance **sa = (sentinelRedisInstance **)a,
                           **sb = (sentinelRedisInstance **)b;

+    char *sa_runid, *sb_runid;
+

     if ((*sa)->slave_priority != (*sb)->slave_priority)
         return (*sa)->slave_priority - (*sb)->slave_priority;
     if ((*sa)->slave_priority != (*sb)->slave_priority)
         return (*sa)->slave_priority - (*sb)->slave_priority;

-    return strcasecmp((*sa)->runid,(*sb)->runid);
+
+    /* If priority is the same, select the slave with that has the
+     * lexicographically smaller runid. Note that we try to handle runid
+     * == NULL as there are old Redis versions that don't publish runid in
+     * INFO. A NULL runid is considered bigger than any other runid. */
+    sa_runid = (*sa)->runid;
+    sb_runid = (*sb)->runid;
+    if (sa_runid == NULL && sb_runid == NULL) return 0;
+    else if (sa_runid == NULL) return 1;  /* a > b */
+    else if (sb_runid == NULL) return -1; /* a < b */
+    return strcasecmp(sa_runid, sb_runid);

 }
 
 sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master) {
 }
 
 sentinelRedisInstance *sentinelSelectSlave(sentinelRedisInstance *master) {