Created
April 1, 2012 09:05
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Example of async hiredis with libevent
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/* | |
Based on code provided by Sebastian Sito in stackoverflow question: | |
http://stackoverflow.com/questions/9958589/async-redis-pooling-using-lib-event | |
*/ | |
#include <stdlib.h> | |
#include <event2/event.h> | |
#include <event2/http.h> | |
#include <event2/buffer.h> | |
#include <hiredis/hiredis.h> | |
#include <hiredis/async.h> | |
#include <hiredis/adapters/libevent.h> | |
typedef struct reqData { | |
struct evhttp_request* req; | |
struct evbuffer* buf; | |
} reqData; | |
struct event_base* base; | |
void get_cb(redisAsyncContext* context, void* r, void* data) { | |
redisReply* reply = r; | |
struct reqData* rd = data; | |
/* error handling omitted for brevity sake */ | |
evbuffer_add_printf(rd->buf, "%s\n", reply->str); | |
evhttp_send_reply(rd->req, HTTP_OK, NULL, rd->buf); | |
evbuffer_free(rd->buf); | |
free( rd ); | |
} | |
void cb(struct evhttp_request* req, void* args) { | |
struct evbuffer* buf; | |
redisAsyncContext* c = (redisAsyncContext *) args; | |
buf = evbuffer_new(); | |
/* Uncomment following code to test without any Redis call | |
evbuffer_add_printf(buf, "toto\n"); | |
evhttp_send_reply(req, HTTP_OK, NULL, buf); | |
evbuffer_free(buf); | |
return; | |
*/ | |
reqData* rd = malloc(sizeof(reqData)); | |
rd->req = req; | |
rd->buf = buf; | |
redisAsyncCommand(c, get_cb, rd, "GET name"); | |
} | |
int main(int argc, char** argv) { | |
struct evhttp* http; | |
struct evhttp_bound_socket* sock; | |
/* Redis connection to be declared and attached to the event loop */ | |
redisAsyncContext* c; | |
c = redisAsyncConnect("0.0.0.0", 6379); | |
/* error handling omitted for brevity sake */ | |
base = event_base_new(); | |
http = evhttp_new(base); | |
sock = evhttp_bind_socket_with_handle(http, "0.0.0.0", 8080); | |
redisLibeventAttach(c, base); | |
evhttp_set_gencb(http, cb, c); | |
event_base_dispatch(base); | |
/* Redis disconnection code omitted */ | |
evhttp_free(http); | |
event_base_free(base); | |
return 0; | |
} |
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In here the redisAsync has its own "loop". Can we reuse the loop provided by the base?