/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
// 如果连接已经断开，尝试连接
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
// 读取数据
if (redisBufferRead(c) == REDIS_ERR) {
// 读取错误，断开连接并做一些清理工作
__redisAsyncDisconnect(ac);
} else {
// 读取数据成功，再次注册读事件，
/* Always re-schedule reads */
_EL_ADD_READ(ac);
// 并处理回调函数
redisProcessCallbacks(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Always re-schedule reads */
#ifdef _WIN32
// There appears to be a bug in the Linux version of _EL_ADD_READ which will not reschedule
// the read if already reading. This is a problem if there is a large number of async GET
// operations. If the receive buffer is exhausted with the data returned, the read would
// not be rescheduled, and the async operations would cease. This forces the read to recur.
_EL_FORCE_ADD_READ(ac);
#else
_EL_ADD_READ(ac);
#endif
redisProcessCallbacks(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Always re-schedule reads */
if (ac->ev.addRead) ac->ev.addRead(ac->ev.data);
redisProcessCallbacks(ac);
}
}
/* This function should be called when the socket is readable.
* It processes all replies that can be read and executes their callbacks.
*/
void redisAsyncHandleRead(redisAsyncContext *ac) {
redisContext *c = &(ac->c);
if (!(c->flags & REDIS_CONNECTED)) {
/* Abort connect was not successful. */
if (__redisAsyncHandleConnect(ac) != REDIS_OK)
return;
/* Try again later when the context is still not connected. */
if (!(c->flags & REDIS_CONNECTED))
return;
}
if (redisBufferRead(c) == REDIS_ERR) {
__redisAsyncDisconnect(ac);
} else {
/* Always re-schedule reads */
_EL_ADD_READ(ac);
redisProcessCallbacks(ac);
}
}
static void test_nonblocking_connection() {
redisContext *c;
int wdone = 0;
test("Calls command callback when command is issued: ");
c = __connect_nonblock();
redisSetCommandCallback(c,__test_callback,(void*)1);
redisCommand(c,"PING");
test_cond(__test_callback_flags == 1);
redisFree(c);
test("Calls disconnect callback on redisDisconnect: ");
c = __connect_nonblock();
redisSetDisconnectCallback(c,__test_callback,(void*)2);
redisDisconnect(c);
test_cond(__test_callback_flags == 2);
redisFree(c);
test("Calls disconnect callback and free callback on redisFree: ");
c = __connect_nonblock();
redisSetDisconnectCallback(c,__test_callback,(void*)2);
redisSetFreeCallback(c,__test_callback,(void*)4);
redisFree(c);
test_cond(__test_callback_flags == ((2 << 8) | 4));
test("redisBufferWrite against empty write buffer: ");
c = __connect_nonblock();
test_cond(redisBufferWrite(c,&wdone) == REDIS_OK && wdone == 1);
redisFree(c);
test("redisBufferWrite against not yet connected fd: ");
c = __connect_nonblock();
redisCommand(c,"PING");
test_cond(redisBufferWrite(c,NULL) == REDIS_ERR &&
strncmp(c->error,"write:",6) == 0);
redisFree(c);
test("redisBufferWrite against closed fd: ");
c = __connect_nonblock();
redisCommand(c,"PING");
redisDisconnect(c);
test_cond(redisBufferWrite(c,NULL) == REDIS_ERR &&
strncmp(c->error,"write:",6) == 0);
redisFree(c);
test("Process callbacks in the right sequence: ");
c = __connect_nonblock();
redisCommandWithCallback(c,__test_reply_callback,(void*)1,"PING");
redisCommandWithCallback(c,__test_reply_callback,(void*)2,"PING");
redisCommandWithCallback(c,__test_reply_callback,(void*)3,"PING");
/* Write output buffer */
wdone = 0;
while(!wdone) {
usleep(500);
redisBufferWrite(c,&wdone);
}
/* Read until at least one callback is executed (the 3 replies will
* arrive in a single packet, causing all callbacks to be executed in
* a single pass). */
while(__test_callback_flags == 0) {
assert(redisBufferRead(c) == REDIS_OK);
redisProcessCallbacks(c);
}
test_cond(__test_callback_flags == 0x010203);
redisFree(c);
test("redisDisconnect executes pending callbacks with NULL reply: ");
c = __connect_nonblock();
redisSetDisconnectCallback(c,__test_callback,(void*)1);
redisCommandWithCallback(c,__test_reply_callback,(void*)2,"PING");
redisDisconnect(c);
test_cond(__test_callback_flags == 0x0201);
redisFree(c);
}
