#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;
}