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Maintain backward compatibiliy withour onConnect callback. 

In f69fac7690, 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
master
michael-grunder 2022-08-25 12:08:20 -07:00
parent e7afd998f9
commit 6a3e96ad21
4 changed files with 51 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
README.md
View File

@ -372,6 +372,8 @@ the disconnect callback is a good point to do so.
Setting the connect or disconnect callbacks can only be done once per context. For subsequent calls the
api will return `REDIS_ERR`. The function to set the callbacks have the following prototype:
```c
/* Alternatively you can use redisAsyncSetConnectCallbackNC which will be passed a non-const
redisAsyncContext* on invocation (e.g. allowing writes to the privdata member). */
int redisAsyncSetConnectCallback(redisAsyncContext *ac, redisConnectCallback *fn);
int redisAsyncSetDisconnectCallback(redisAsyncContext *ac, redisDisconnectCallback *fn);
```

55
async.c
View File

@ -140,6 +140,7 @@ static redisAsyncContext *redisAsyncInitialize(redisContext *c) {
ac->ev.scheduleTimer = NULL;
ac->onConnect = NULL;
ac->onConnectNC = NULL;
ac->onDisconnect = NULL;
ac->replies.head = NULL;
@ -226,17 +227,34 @@ redisAsyncContext *redisAsyncConnectUnix(const char *path) {
return redisAsyncConnectWithOptions(&options);
}
int redisAsyncSetConnectCallback(redisAsyncContext *ac, redisConnectCallback *fn) {
if (ac->onConnect == NULL) {
ac->onConnect = fn;
static int
redisAsyncSetConnectCallbackImpl(redisAsyncContext *ac, redisConnectCallback *fn,
redisConnectCallbackNC *fn_nc)
{
/* If either are already set, this is an error */
if (ac->onConnect || ac->onConnectNC)
return REDIS_ERR;
/* The common way to detect an established connection is to wait for
* the first write event to be fired. This assumes the related event
* library functions are already set. */
_EL_ADD_WRITE(ac);
return REDIS_OK;
if (fn) {
ac->onConnect = fn;
} else if (fn_nc) {
ac->onConnectNC = fn_nc;
}
return REDIS_ERR;
/* The common way to detect an established connection is to wait for
* the first write event to be fired. This assumes the related event
* library functions are already set. */
_EL_ADD_WRITE(ac);
return REDIS_OK;
}
int redisAsyncSetConnectCallback(redisAsyncContext *ac, redisConnectCallback *fn) {
return redisAsyncSetConnectCallbackImpl(ac, fn, NULL);
}
int redisAsyncSetConnectCallbackNC(redisAsyncContext *ac, redisConnectCallbackNC *fn) {
return redisAsyncSetConnectCallbackImpl(ac, NULL, fn);
}
int redisAsyncSetDisconnectCallback(redisAsyncContext *ac, redisDisconnectCallback *fn) {
@ -305,14 +323,23 @@ static void __redisRunPushCallback(redisAsyncContext *ac, redisReply *reply) {
static void __redisRunConnectCallback(redisAsyncContext *ac, int status)
{
if (ac->onConnect) {
if (!(ac->c.flags & REDIS_IN_CALLBACK)) {
ac->c.flags |= REDIS_IN_CALLBACK;
if (ac->onConnect == NULL && ac->onConnectNC == NULL)
return;
if (!(ac->c.flags & REDIS_IN_CALLBACK)) {
ac->c.flags |= REDIS_IN_CALLBACK;
if (ac->onConnect) {
ac->onConnect(ac, status);
ac->c.flags &= ~REDIS_IN_CALLBACK;
} else {
/* already in callback */
ac->onConnectNC(ac, status);
}
ac->c.flags &= ~REDIS_IN_CALLBACK;
} else {
/* already in callback */
if (ac->onConnect) {
ac->onConnect(ac, status);
} else {
ac->onConnectNC(ac, status);
}
}
}

5
async.h
View File

@ -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);

8
test.c
View File

@ -2008,7 +2008,7 @@ static redisAsyncContext *do_aconnect(struct config config, astest_no testno)
{
redisOptions options = {0};
memset(&astest, 0, sizeof(astest));
astest.testno = testno;
astest.connect_status = astest.disconnect_status = -2;
@ -2039,7 +2039,7 @@ static redisAsyncContext *do_aconnect(struct config config, astest_no testno)
c->data = &astest;
c->dataCleanup = asCleanup;
redisPollAttach(c);
redisAsyncSetConnectCallback(c, connectCallback);
redisAsyncSetConnectCallbackNC(c, connectCallback);
redisAsyncSetDisconnectCallback(c, disconnectCallback);
return c;
}
@ -2058,7 +2058,7 @@ static void test_async_polling(struct config config) {
int status;
redisAsyncContext *c;
struct config defaultconfig = config;
test("Async connect: ");
c = do_aconnect(config, ASTEST_CONNECT);
assert(c);
@ -2095,7 +2095,7 @@ static void test_async_polling(struct config config) {
test_cond(astest.connect_status == REDIS_ERR);
config = defaultconfig;
}
/* Test a ping/pong after connection */
test("Async PING/PONG: ");
c = do_aconnect(config, ASTEST_PINGPONG);