Maintain backward compatibiliy withour onConnect callback.

In f69fac7690fb22a7fc19dba61ef70e5f79ccb2e9, our async onConnect
callback was improved to take a non-const redisAsyncContext allowing it
to be reentrant.

Unfortunately, this is a breaking change we can't make until hiredis
v2.0.0.

This commit creates a separate callback member and corresponding
function that allows us to use the new functionality, while maintaining
our existing API for legacy code.

Fixes #1086

1 files changed, 4 insertions, 1 deletions

diff --git a/async.h b/async.h
index 690b31f..4f94660 100644
--- a/async.h
+++ b/async.h
@@ -57,7 +57,8 @@ typedef struct redisCallbackList {
 
 /* Connection callback prototypes */
 typedef void (redisDisconnectCallback)(const struct redisAsyncContext*, int status);
-typedef void (redisConnectCallback)(struct redisAsyncContext*, int status);
+typedef void (redisConnectCallback)(const struct redisAsyncContext*, int status);
+typedef void (redisConnectCallbackNC)(struct redisAsyncContext *, int status);
 typedef void(redisTimerCallback)(void *timer, void *privdata);
 
 /* Context for an async connection to Redis */
@@ -93,6 +94,7 @@ typedef struct redisAsyncContext {
 
     /* Called when the first write event was received. */
     redisConnectCallback *onConnect;
+    redisConnectCallbackNC *onConnectNC;
 
     /* Regular command callbacks */
     redisCallbackList replies;
@@ -121,6 +123,7 @@ redisAsyncContext *redisAsyncConnectBindWithReuse(const char *ip, int port,
                                                   const char *source_addr);
 redisAsyncContext *redisAsyncConnectUnix(const char *path);
 int redisAsyncSetConnectCallback(redisAsyncContext *ac, redisConnectCallback *fn);
+int redisAsyncSetConnectCallbackNC(redisAsyncContext *ac, redisConnectCallbackNC *fn);
 int redisAsyncSetDisconnectCallback(redisAsyncContext *ac, redisDisconnectCallback *fn);
 
 redisAsyncPushFn *redisAsyncSetPushCallback(redisAsyncContext *ac, redisAsyncPushFn *fn);