func (c *Cluster) doGET(w http.ResponseWriter, r *http.Request) {
var err error
// path is already read because we are using http.StripPrefix
path := r.URL.Path
if path == "" {
http.NotFound(w, r)
return
}
slave := c.getReadSlave()
// this makes it easy to debug with curl -v
w.Header().Add("X-RRPROXY-SERVER", slave.Addr)
// get a redis client from the pool
client, err := slave.Get()
if err != nil {
log.Error(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// make sure we return it
defer slave.Put(client)
var resp *redis.Resp
// check to see if the key exists
resp = client.Cmd("EXISTS", path)
v, _ := resp.Int()
if v == 0 {
http.NotFound(w, r)
return
}
// here we introduce some artifical latency. without it, and with redis
// running on the same laptop as the server, other layers become the bottle
// neck rather than redis, which kinda defeats the purpose of this lab
if ForcedLatency > 0 {
resp = client.Cmd("DEBUG", "sleep", ForcedLatency.Seconds())
if resp.Err != nil {
log.Fatal(resp.Err)
}
}
// get the raw value as bytes and write it out
resp = client.Cmd("GET", path)
data, err := resp.Bytes()
if err != nil {
log.Error(err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Write(data)
}
