Modules: StringAppendBuffer() and ability to retain strings.

RedisModule_StringRetain() allows, when automatic memory management is
on, to keep string objects living after the callback returns. Can also
be used in order to use Redis reference counting of objects inside
modules.

The reason why this is useful is that sometimes when implementing new
data types we want to reference RedisModuleString objects inside the
module private data structures, so those string objects must be valid
after the callback returns even if not referenced inside the Redis key
space.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/redismodule.h b/src/redismodule.h
index fd9e46dc6..b368049d1 100644
--- a/src/redismodule.h
+++ b/src/redismodule.h
@@ -184,6 +184,8 @@ char *REDISMODULE_API_FUNC(RedisModule_LoadStringBuffer)(RedisModuleIO *io, size
 void REDISMODULE_API_FUNC(RedisModule_SaveDouble)(RedisModuleIO *io, double value);
 double REDISMODULE_API_FUNC(RedisModule_LoadDouble)(RedisModuleIO *io);
 void REDISMODULE_API_FUNC(RedisModule_Log)(RedisModuleCtx *ctx, const char *level, const char *fmt, ...);
+int REDISMODULE_API_FUNC(RedisModule_StringAppendBuffer)(RedisModuleCtx *ctx, RedisModuleString *str, const char *buf, size_t len);
+void REDISMODULE_API_FUNC(RedisModule_RetainString)(RedisModuleCtx *ctx, RedisModuleString *str);
 
 /* This is included inline inside each Redis module. */
 static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int apiver) __attribute__((unused));
@@ -277,6 +279,8 @@ static int RedisModule_Init(RedisModuleCtx *ctx, const char *name, int ver, int
     REDISMODULE_GET_API(LoadDouble);
     REDISMODULE_GET_API(EmitAOF);
     REDISMODULE_GET_API(Log);
+    REDISMODULE_GET_API(StringAppendBuffer);
+    REDISMODULE_GET_API(RetainString);
 
     RedisModule_SetModuleAttribs(ctx,name,ver,apiver);
     return REDISMODULE_OK;