Add millisecond support for EXPIREMEMBER command

Former-commit-id: 6e6cd84ad7dc9e5763ab36668cbbf8ca6743f8d9

src/expire.cpp

@@ -130,13 +130,43 @@ void activeExpireCycleExpire(redisDb *db, expireEntry &e, long long now) {
     }
 }
 
+int parseUnitString(const char *sz)
+{
+    if (strcasecmp(sz, "s") == 0)
+        return UNIT_SECONDS;
+    if (strcasecmp(sz, "ms") == 0)
+        return UNIT_MILLISECONDS;
+    return -1;
+}
+
 void expireMemberCommand(client *c)
 {
     long long when;
     if (getLongLongFromObjectOrReply(c, c->argv[3], &when, NULL) != C_OK)
         return;
 
-    when *= 1000;
+    if (c->argc > 5) {
+        addReplyError(c, "Invalid number of arguments");
+        return;
+    }
+
+    int unit = UNIT_SECONDS;
+    if (c->argc == 5) {
+        unit = parseUnitString(szFromObj(c->argv[4]));
+    }
+
+    switch (unit)
+    {
+    case UNIT_SECONDS:
+        when *= 1000;
+    case UNIT_MILLISECONDS:
+        break;
+    
+    default:
+        addReplyError(c, "Invalid unit arg");
+        return;
+    }
+    
     when += mstime();
 
     /* No key, return zero. */

src/help.h

@@ -344,8 +344,8 @@ struct commandHelp {
     0,
     "1.2.0" },
     { "EXPIREMEMBER",
-    "key subkey seconds",
+    "key subkey delay [Unit: s,ms]",
-    "set a subkey's time to live in seconds"},
+    "set a subkey's time to live in seconds (or milliseconds)"},
     { "FLUSHALL",
     "[ASYNC]",
     "Remove all keys from all databases",

src/server.cpp

@@ -623,7 +623,7 @@ struct redisCommand redisCommandTable[] = {
      "write fast @keyspace",
      0,NULL,1,1,1,0,0,0},
 
-    {"expiremember", expireMemberCommand, 4,
+    {"expiremember", expireMemberCommand, -4,
      "write fast @keyspace",
      0,NULL,1,1,1,0,0,0},