From 1c245845eda46512ed3eb5f7e502c3b7f535ac89 Mon Sep 17 00:00:00 2001
From: Pieter Noordhuis <pcnoordhuis@gmail.com>
Date: Sat, 25 Sep 2010 22:31:07 +0200
Subject: Trigger callbacks when a command is issued or the context is free'd

---
 hiredis.c | 21 ++++++++++++++++++++-
 hiredis.h | 22 ++++++++++++++++++----
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/hiredis.c b/hiredis.c
index 29968c9..e59919d 100644
--- a/hiredis.c
+++ b/hiredis.c
@@ -575,7 +575,7 @@ static int redisContextConnect(redisContext *c, const char *ip, int port) {
 }
 
 static redisContext *redisContextInit(redisReplyFunctions *fn) {
-    redisContext *c = malloc(sizeof(*c));
+    redisContext *c = calloc(sizeof(redisContext),1);
     c->error = NULL;
     c->obuf = sdsempty();
     c->fn = fn == NULL ? &defaultFunctions : fn;
@@ -587,6 +587,8 @@ static redisContext *redisContextInit(redisReplyFunctions *fn) {
 }
 
 void redisFree(redisContext *c) {
+    if (c->cbFree != NULL)
+        c->cbFree(c,c->privdataFree);
     if (c->error != NULL)
         sdsfree(c->error);
     if (c->obuf != NULL)
@@ -614,6 +616,19 @@ redisContext *redisConnectNonBlock(const char *ip, int port, redisReplyFunctions
     return c;
 }
 
+/* Register callback that is triggered when a command is put in the output
+ * buffer when the context is non-blocking. */
+void redisSetCommandCallback(redisContext *c, redisContextCallback *fn, void *privdata) {
+    c->cbCommand = fn;
+    c->privdataCommand = privdata;
+}
+
+/* Register callback that is triggered when the context is free'd. */
+void redisSetFreeCallback(redisContext *c, redisContextCallback *fn, void *privdata) {
+    c->cbFree = fn;
+    c->privdataFree = privdata;
+}
+
 /* Use this function to handle a read event on the descriptor. It will try
  * and read some bytes from the socket and feed them to the reply parser.
  *
@@ -749,6 +764,10 @@ static int redisCommandWriteNonBlock(redisContext *c, redisCallback *cb, char *s
     }
     c->cpos++;
 
+    /* Fire write callback */
+    if (c->cbCommand != NULL)
+        c->cbCommand(c,c->privdataCommand);
+
     return REDIS_OK;
 }
 
diff --git a/hiredis.h b/hiredis.h
index 96508ad..72a4077 100644
--- a/hiredis.h
+++ b/hiredis.h
@@ -70,11 +70,13 @@ typedef struct redisReplyObjectFunctions {
     void (*freeObject)(void*);
 } redisReplyFunctions;
 
-/* Callback prototype */
-struct redisContext; /* needs forward declaration of redisContext */
-typedef void redisCallbackFn(struct redisContext*, redisReply*, void*);
+struct redisContext; /* need forward declaration of redisContext */
+
+/* Callbacks triggered on non-reply events. */
+typedef void (redisContextCallback)(struct redisContext*, void*);
 
-/* Callback container */
+/* Reply callback prototype and container */
+typedef void redisCallbackFn(struct redisContext*, redisReply*, void*);
 typedef struct redisCallback {
     redisCallbackFn *fn;
     void *privdata;
@@ -86,8 +88,18 @@ typedef struct redisContext {
     int flags;
     sds error; /* Error object is set when in erronous state */
     sds obuf; /* Write buffer */
+
+    /* Function set for reply buildup and reply reader */
     redisReplyFunctions *fn;
     void *reader;
+
+    /* Non-reply callbacks */
+    redisContextCallback *cbCommand;
+    void *privdataCommand;
+    redisContextCallback *cbFree;
+    void *privdataFree;
+
+    /* Reply callbacks */
     redisCallback *callbacks;
     int cpos;
     int clen;
@@ -103,6 +115,8 @@ int redisReplyReaderGetReply(void *reader, void **reply);
 
 redisContext *redisConnect(const char *ip, int port, redisReplyFunctions *fn);
 redisContext *redisConnectNonBlock(const char *ip, int port, redisReplyFunctions *fn);
+void redisSetCommandCallback(redisContext *c, redisContextCallback *fn, void *privdata);
+void redisSetFreeCallback(redisContext *c, redisContextCallback *fn, void *privdata);
 void redisFree(redisContext *c);
 int redisBufferRead(redisContext *c);
 int redisBufferWrite(redisContext *c, int *done);
-- 
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