From eed8495bf18242d5afd456ae8d73f392a7e9a84e Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Fri, 4 Apr 2014 16:10:00 +0200
Subject: [PATCH] Make LZF in-memory compression actually configurable.

---
 redis.conf   |  4 ++++
 src/config.c | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/redis.conf b/redis.conf
index 1e53917b6..11fb26ad9 100644
--- a/redis.conf
+++ b/redis.conf
@@ -762,3 +762,7 @@ hz 10
 # big latency spikes.
 aof-rewrite-incremental-fsync yes
 
+# Transparently compress string objects in memory using LZF.
+# For default this is set to no since it may affect performances, however
+# when caching things like HTML fragments this may result into a big win.
+memcompression no
diff --git a/src/config.c b/src/config.c
index 15ea1c5c3..e1de451e7 100644
--- a/src/config.c
+++ b/src/config.c
@@ -297,6 +297,10 @@ void loadServerConfigFromString(char *config) {
             if ((server.rdb_compression = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
             }
+        } else if (!strcasecmp(argv[0],"memcompression") && argc == 2) {
+            if ((server.mem_compression = yesnotoi(argv[1])) == -1) {
+                err = "argument must be 'yes' or 'no'"; goto loaderr;
+            }
         } else if (!strcasecmp(argv[0],"rdbchecksum") && argc == 2) {
             if ((server.rdb_checksum = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
@@ -860,6 +864,11 @@ void configSetCommand(redisClient *c) {
 
         if (yn == -1) goto badfmt;
         server.rdb_compression = yn;
+    } else if (!strcasecmp(c->argv[2]->ptr,"memcompression")) {
+        int yn = yesnotoi(o->ptr);
+
+        if (yn == -1) goto badfmt;
+        server.mem_compression = yn;
     } else if (!strcasecmp(c->argv[2]->ptr,"notify-keyspace-events")) {
         int flags = keyspaceEventsStringToFlags(o->ptr);
 
@@ -1006,6 +1015,7 @@ void configGetCommand(redisClient *c) {
             server.stop_writes_on_bgsave_err);
     config_get_bool_field("daemonize", server.daemonize);
     config_get_bool_field("rdbcompression", server.rdb_compression);
+    config_get_bool_field("memcompression", server.mem_compression);
     config_get_bool_field("rdbchecksum", server.rdb_checksum);
     config_get_bool_field("activerehashing", server.activerehashing);
     config_get_bool_field("repl-disable-tcp-nodelay",
@@ -1721,6 +1731,7 @@ int rewriteConfig(char *path) {
     rewriteConfigNumericalOption(state,"databases",server.dbnum,REDIS_DEFAULT_DBNUM);
     rewriteConfigYesNoOption(state,"stop-writes-on-bgsave-error",server.stop_writes_on_bgsave_err,REDIS_DEFAULT_STOP_WRITES_ON_BGSAVE_ERROR);
     rewriteConfigYesNoOption(state,"rdbcompression",server.rdb_compression,REDIS_DEFAULT_RDB_COMPRESSION);
+    rewriteConfigYesNoOption(state,"memcompression",server.mem_compression,REDIS_DEFAULT_MEM_COMPRESSION);
     rewriteConfigYesNoOption(state,"rdbchecksum",server.rdb_checksum,REDIS_DEFAULT_RDB_CHECKSUM);
     rewriteConfigStringOption(state,"dbfilename",server.rdb_filename,REDIS_DEFAULT_RDB_FILENAME);
     rewriteConfigDirOption(state);
-- 
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