func slaveLoop(conn redis.Conn, delegate Worker, handle string) {
var redisMsg redisMessage
logger := logs.NewLogger("redis.slave")
logger.Info("Started slave")
for {
reply, err := redis.Strings(conn.Do("BLPOP", "stop-"+handle, "tasks", 0))
if len(reply) == 0 {
panic("Empty task, usually means connection lost, shutting down")
}
if reply[0] == "stop-"+handle {
conn.Do("RPUSH", "stopped-"+handle, true)
break
}
if err == nil {
redisMsg.WorkloadContext = context.New()
json.Unmarshal([]byte(reply[1]), &redisMsg)
go func(experiment string, replyTo string, workloadCtx context.Context) {
result := delegate.Time(experiment, workloadCtx)
var encoded []byte
encoded, err = json.Marshal(result)
logger.Debug("Completed slave task, replying")
conn.Do("RPUSH", replyTo, string(encoded))
}(redisMsg.Workload, redisMsg.Reply, redisMsg.WorkloadContext)
}
if err != nil {
logger.Warnf("ERROR: slave encountered error: %v", err)
}
}
}
func push(c redis.Conn, guid string, sample *experiment.Sample) {
json, _ := json.Marshal(sample)
c.Do("RPUSH", "experiment."+guid, json)
}