From 0cf6b1e3ae303214f0fdc73890cac2db41a75225 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Wed, 7 Mar 2018 16:08:06 +0100
Subject: CG: XINFO CONSUMERS implemented.

---
 src/server.c   |  1 +
 src/server.h   |  1 +
 src/t_stream.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/src/server.c b/src/server.c
index 8c8300439..6f06a33a0 100644
--- a/src/server.c
+++ b/src/server.c
@@ -312,6 +312,7 @@ struct redisCommand redisCommandTable[] = {
     {"xack",xackCommand,-3,"wF",0,NULL,1,1,1,0,0},
     {"xpending",xpendingCommand,-3,"r",0,NULL,1,1,1,0,0},
     {"xclaim",xclaimCommand,-5,"wF",0,NULL,1,1,1,0,0},
+    {"xinfo",xinfoCommand,-2,"r",0,NULL,1,1,1,0,0},
     {"post",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
     {"host:",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
     {"latency",latencyCommand,-2,"aslt",0,NULL,0,0,0,0,0}
diff --git a/src/server.h b/src/server.h
index 76aaab88f..046e84b45 100644
--- a/src/server.h
+++ b/src/server.h
@@ -2029,6 +2029,7 @@ void xgroupCommand(client *c);
 void xackCommand(client *c);
 void xpendingCommand(client *c);
 void xclaimCommand(client *c);
+void xinfoCommand(client *c);
 
 #if defined(__GNUC__)
 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
diff --git a/src/t_stream.c b/src/t_stream.c
index 3b7d022a1..7944ab398 100644
--- a/src/t_stream.c
+++ b/src/t_stream.c
@@ -1858,3 +1858,54 @@ void xclaimCommand(client *c) {
 }
 
 /* XINFO <key> [CONSUMERS group|GROUPS|STREAM]. STREAM is the default */
+void xinfoCommand(client *c) {
+    const char *help[] = {
+"<key> CONSUMERS <groupname>  -- Show consumer groups of group <groupname>.",
+"<key> GROUPS                 -- Show the stream consumer groups.",
+"<key> STREAM                 -- Show information about the stream.",
+"<key> HELP                   -- Prints this help.",
+NULL
+    };
+    stream *s = NULL;
+    char *opt = c->argc > 2 ? c->argv[2]->ptr : "STREAM"; /* Subcommand. */
+
+    /* Lookup the key now, this is common for all the subcommands but HELP. */
+    if (c->argc >= 3 && strcasecmp(opt,"HELP")) {
+        robj *o = lookupKeyWriteOrReply(c,c->argv[1],shared.nokeyerr);
+        if (o == NULL) return;
+        s = o->ptr;
+    }
+
+    /* Dispatch the different subcommands. */
+    if (!strcasecmp(opt,"CONSUMERS") && c->argc == 4) {
+        streamCG *cg = streamLookupCG(s,c->argv[3]->ptr);
+        if (cg == NULL) {
+            addReplyErrorFormat(c, "-NOGROUP No such consumer group '%s' "
+                                   "for key name '%s'",
+                                   c->argv[3]->ptr, c->argv[1]->ptr);
+            return;
+        }
+
+        addReplyMultiBulkLen(c,raxSize(cg->consumers));
+        raxIterator ri;
+        raxStart(&ri,cg->consumers);
+        raxSeek(&ri,"^",NULL,0);
+        mstime_t now = mstime();
+        while(raxNext(&ri)) {
+            streamConsumer *consumer = ri.data;
+            mstime_t idle = now - consumer->seen_time;
+            if (idle < 0) idle = 0;
+
+            addReplyMultiBulkLen(c,3);
+            addReplyBulkCBuffer(c,consumer->name,sdslen(consumer->name));
+            addReplyLongLong(c,raxSize(consumer->pel));
+            addReplyLongLong(c,idle);
+        }
+        raxStop(&ri);
+    } else if (!strcasecmp(opt,"HELP")) {
+        addReplyHelp(c, help);
+    } else {
+        addReply(c,shared.syntaxerr);
+    }
+}
+
-- 
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