Add a timeout to the libuv hiredis adapter

libuv-timeout.patch

diff --git a/adapters/libuv.h b/adapters/libuv.h
index c120b1b..b0b9ed4 100644
--- a/adapters/libuv.h
+++ b/adapters/libuv.h
@@ -9,6 +9,7 @@
 typedef struct redisLibuvEvents {
   redisAsyncContext* context;
   uv_poll_t          handle;
+  uv_timer_t         timer;
   int                events;
 } redisLibuvEvents;

@@ -76,11 +77,32 @@ static void on_close(uv_handle_t* handle) {
   hi_free(p);
 }

+static void redisLibuvTimeout(uv_timer_t *timer) {
+  redisLibuvEvents *e = (redisLibuvEvents*)timer->data;
+  redisAsyncHandleTimeout(e->context);
+}
+
+static void redisLibuvSetTimeout(void *privdata, struct timeval tv) {
+  redisLibuvEvents* p = (redisLibuvEvents*)privdata;
+
+  uint64_t millsec = tv.tv_sec * 1000 + tv.tv_usec / 1000.0;
+  if (p->timer.type == UV_UNKNOWN_HANDLE) {
+    // timer is uninitialized
+    if (uv_timer_init(p->handle.loop, &p->timer) != 0) {
+      return;
+    }
+    p->timer.data = p;
+  }
+  uv_timer_start(&p->timer, redisLibuvTimeout, millsec, 0);
+}

 static void redisLibuvCleanup(void *privdata) {
   redisLibuvEvents* p = (redisLibuvEvents*)privdata;

   p->context = NULL; // indicate that context might no longer exist
+  if (p->timer.type != UV_UNKNOWN_HANDLE) {
+    uv_timer_stop(&p->timer);
+  }
   uv_close((uv_handle_t*)&p->handle, on_close);
 }

@@ -92,11 +114,12 @@ static int redisLibuvAttach(redisAsyncContext* ac, uv_loop_t* loop) {
     return REDIS_ERR;
   }

-  ac->ev.addRead  = redisLibuvAddRead;
-  ac->ev.delRead  = redisLibuvDelRead;
-  ac->ev.addWrite = redisLibuvAddWrite;
-  ac->ev.delWrite = redisLibuvDelWrite;
-  ac->ev.cleanup  = redisLibuvCleanup;
+  ac->ev.addRead        = redisLibuvAddRead;
+  ac->ev.delRead        = redisLibuvDelRead;
+  ac->ev.addWrite       = redisLibuvAddWrite;
+  ac->ev.delWrite       = redisLibuvDelWrite;
+  ac->ev.cleanup        = redisLibuvCleanup;
+  ac->ev.scheduleTimer  = redisLibuvSetTimeout;

   redisLibuvEvents* p = (redisLibuvEvents*)hi_malloc(sizeof(*p));
   if (p == NULL)