From 5c86d9e7b03dbe6f10548d24ca92b6c96418fd3e Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Sun, 13 Apr 2014 23:01:21 +0200
Subject: PFDEBUG added, PFGETREG removed.

PFDEBUG will be the interface to do debugging tasks with a key
containing an HLL object.
---
 src/hyperloglog.c | 30 +++++++++++++++++++++++-------
 src/redis.c       |  2 +-
 src/redis.h       |  2 +-
 3 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index 0f92ff50a..f99d188f8 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -1214,26 +1214,42 @@ cleanup:
     sdsfree(bitcounters);
 }
 
-/* PFGETREG
- * Return the registers values of the specified HLL. */
-void pfgetregCommand(redisClient *c) {
-    robj *o = lookupKeyRead(c->db,c->argv[1]);
+/* PFDEBUG <subcommand> <key> ... args ...
+ * Different debugging related operations about the HLL implementation. */
+void pfdebugCommand(redisClient *c) {
+    char *cmd = c->argv[1]->ptr;
     struct hllhdr *hdr;
+    robj *o;
     int j;
 
+    o = lookupKeyRead(c->db,c->argv[2]);
     if (o == NULL) {
         addReplyError(c,"The specified key does not exist");
         return;
-    } else {
-        if (isHLLObjectOrReply(c,o) != REDIS_OK) return;
+    }
+    if (isHLLObjectOrReply(c,o) != REDIS_OK) return;
+    o = dbUnshareStringValue(c->db,c->argv[2],o);
+    hdr = o->ptr;
+
+    /* PFDEBUG GETREG <key> */
+    if (!strcasecmp(cmd,"getreg")) {
+        if (c->argc != 3) goto arityerr;
 
-        hdr = o->ptr;
         addReplyMultiBulkLen(c,HLL_REGISTERS);
+        hllSparseToDense(o);
         for (j = 0; j < HLL_REGISTERS; j++) {
             uint8_t val;
 
             HLL_DENSE_GET_REGISTER(val,hdr->registers,j);
             addReplyLongLong(c,val);
         }
+    } else {
+        addReplyErrorFormat(c,"Unknown PFDEBUG subcommand '%s'", cmd);
     }
+    return;
+
+arityerr:
+    addReplyErrorFormat(c,
+        "Wrong number of arguments for the '%s' subcommand",cmd);
 }
+
diff --git a/src/redis.c b/src/redis.c
index f34b648fa..8d1506116 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -265,7 +265,7 @@ struct redisCommand redisCommandTable[] = {
     {"pfadd",pfaddCommand,-2,"wm",0,NULL,1,1,1,0,0},
     {"pfcount",pfcountCommand,2,"w",0,NULL,1,1,1,0,0},
     {"pfmerge",pfmergeCommand,-2,"wm",0,NULL,1,-1,1,0,0},
-    {"pfgetreg",pfgetregCommand,2,"r",0,NULL,0,0,0,0,0}
+    {"pfdebug",pfdebugCommand,-3,"r",0,NULL,0,0,0,0,0}
 };
 
 /*============================ Utility functions ============================ */
diff --git a/src/redis.h b/src/redis.h
index 418b0b23d..0c40a7f4f 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -1363,7 +1363,7 @@ void pfselftestCommand(redisClient *c);
 void pfaddCommand(redisClient *c);
 void pfcountCommand(redisClient *c);
 void pfmergeCommand(redisClient *c);
-void pfgetregCommand(redisClient *c);
+void pfdebugCommand(redisClient *c);
 
 #if defined(__GNUC__)
 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
-- 
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