/
enqueue.go
299 lines (224 loc) · 8.12 KB
/
enqueue.go
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package main
import (
"fmt"
"github.com/bitly/go-simplejson"
"github.com/streadway/amqp"
"labix.org/v2/mgo"
"labix.org/v2/mgo/bson"
"log/syslog"
// "math/rand"
"time"
)
func enqueue(syslogLog *syslog.Writer, mongoHref string, mongoDatabaseName string, mongoCollectionName string, amqpHref string, amqpExchange string, amqpExchangeType string, amqpQueue string) {
//DEBUG
syslogLog.Notice("[enqueue] BEGIN")
syslogLog.Notice( fmt.Sprintf(" [enqueue] mongoHref = [%v]", mongoHref ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] mongoDatabaseName = [%v]", mongoDatabaseName ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] mongoCollectionName = [%v]", mongoCollectionName ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] amqpHref = [%v]", amqpHref ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] amqpExchange = [%v]", amqpExchange ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] amqpExchangeType = [%v]", amqpExchangeType ) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] amqpQueue = [%v]", amqpQueue ) )
// Deal with parameters.
if "" == mongoHref {
errMsg := fmt.Sprintf(" [enqueue] Bad mongoHref. Received: [%v].", mongoHref)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == mongoDatabaseName {
errMsg := fmt.Sprintf(" [enqueue] Bad mongoHref. Received: [%v].", mongoDatabaseName)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == mongoCollectionName {
errMsg := fmt.Sprintf(" [enqueue] Bad mongoHref. Received: [%v].", mongoCollectionName)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == amqpHref {
errMsg := fmt.Sprintf(" [enqueue] Bad amqpHref. Received: [%v].", amqpHref)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == amqpExchange {
errMsg := fmt.Sprintf(" [enqueue] Bad amqpExchange. Received: [%v].", amqpExchange)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == amqpExchangeType {
errMsg := fmt.Sprintf(" [enqueue] Bad amqpExchangeType. Received: [%v].", amqpExchangeType)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
if "" == amqpQueue {
errMsg := fmt.Sprintf(" [enqueue] Bad amqpQueue. Received: [%v].", amqpQueue)
syslogLog.Err(errMsg)
panic(errMsg)
/////////////////////// RETURN
return
}
// Connect to AMQP.
amqpConnection, err := amqp.Dial(amqpHref)
if err != nil {
syslogLog.Err( fmt.Sprintf(" [enqueue] Could NOT connect to AMQP server (RabbitMQ?) at [%v], received err = [%v]", amqpHref, err) )
panic(err)
/////////////////////// RETURN
return
}
defer amqpConnection.Close()
amqpChannel, err := amqpConnection.Channel()
if err != nil {
syslogLog.Err(" [enqueue] Could NOT get AMQP channel")
panic(err)
/////////////////////// RETURN
return
}
//DEBUG
syslogLog.Notice( fmt.Sprintf(" [enqueue] amqpChannel = [%v]", amqpChannel) )
// Connect to MongoDB
mongoSession, err := mgo.Dial(mongoHref)
if err != nil {
syslogLog.Err( fmt.Sprintf(" [enqueue] Could NOT connect to MongoDB at [%v], received err = [%v]", mongoHref, err) )
panic(err)
/////////////////////// RETURN
return
}
defer mongoSession.Close()
// Optional. Switch the session to a monotonic behavior.
mongoSession.SetMode(mgo.Monotonic, true)
mongoCollection := mongoSession.DB(mongoDatabaseName).C(mongoCollectionName)
//DEBUG
syslogLog.Notice( fmt.Sprintf(" [enqueue] Connected to MongoDB with %v.%v", mongoDatabaseName, mongoCollectionName) )
// AMQP queue bind.
amqpKey := amqpQueue
if err = amqpChannel.QueueBind(
amqpQueue, // name of the queue
amqpKey, // bindingKey
amqpExchange, // sourceExchange
false, // noWait
nil, // arguments
); err != nil {
syslogLog.Err( fmt.Sprintf(" [enqueue] Could NOT bind to queue [%v] on AMQP server (RabbitMQ?) at [%v], received err = [%v]", amqpQueue, amqpHref, err) )
panic(err)
/////////////////////// RETURN
return
}
//DEBUG
syslogLog.Notice(" [enqueue] Queue bound.")
// Set up AMQP consumer.
amqpDeliveries, err := amqpChannel.Consume(
amqpQueue, // name
"turtledq", // consumerTag
false, // noAck
false, // exclusive
false, // noLocal
false, // noWait
nil, // arguments
)
if err != nil {
syslogLog.Err( fmt.Sprintf(" [enqueue] Could NOT get deliverables from queue [%v] on AMQP server (RabbitMQ?) at [%v], received err = [%v]", amqpQueue, amqpHref, err) )
panic(err)
/////////////////////// RETURN
return
}
// Forever
for d := range amqpDeliveries {
//DEBUG
syslogLog.Notice(" [enqueue] =-<>-=-<>-=-<>-=-<>-=-<>-=-<>-=-<>-=-<>-=-<>-=-<>-= LOOP")
syslogLog.Notice( fmt.Sprintf(" [enqueue] got %dB message: [%v]", len(d.Body), d.DeliveryTag) )
syslogLog.Notice( fmt.Sprintf(" [enqueue] THING: [%v]", d) )
sjson, err := simplejson.NewJson(d.Body)
if nil != err {
//DEBUG
syslogLog.Err( fmt.Sprintf(" [enqueue] Could NOT parse raw JSON: [%v]", d.Body) )
//@TODO ##################################################################################################################
}
//DEBUG
syslogLog.Notice( fmt.Sprintf(" [enqueue] json = [%#v]", sjson) )
haveTarget := true
messageTarget, err := sjson.Get("target").String()
if nil != err {
haveTarget = false
}
//DEBUG
if haveTarget {
syslogLog.Notice( fmt.Sprintf(" [enqueue] target = [%v]", messageTarget) )
} else {
syslogLog.Notice(" [enqueue] either do NOT have messageTarget (or did not receive a \"good\" one)")
}
haveWhen := true
messageWhen, err := sjson.Get("when").Int64()
if nil != err {
haveWhen = false
}
//DEBUG
if haveWhen {
syslogLog.Notice( fmt.Sprintf(" [enqueue] when = [%v]", messageWhen) )
} else {
syslogLog.Notice(" [enqueue] either do NOT have messageTarget (or did not receive a \"good\" one)")
}
haveMessage := true
messageMessage, err := sjson.Get("message").Map()
if nil != err {
haveMessage = false
}
//DEBUG
if haveMessage {
syslogLog.Notice( fmt.Sprintf(" [enqueue] message = [%v]", messageMessage) )
} else {
syslogLog.Notice(" [enqueue] either do NOT have messageMessage (or did not receive a \"good\" one)")
}
// Deal with corrupted items.
if !haveTarget || !haveWhen || !haveMessage {
//DEBUG
syslogLog.Notice(" [enqueue] Empty item from AMQP queue. Will ACK early and continue.")
// Ack.
err = d.Ack(false)
if nil != err {
syslogLog.Err( fmt.Sprintf(" [enqueue] ERROR EARLY ACKing: [%v]", err) )
}
//DEBUG
syslogLog.Notice(" [enqueue] EARLY ACKed")
/////////////////////// CONTINUE
continue
}
// Enqueue the item
mongoDoc := bson.M{
"target": messageTarget,
"when": time.Unix(messageWhen, 0),
"message": messageMessage}
err = mongoCollection.Insert(mongoDoc)
if nil != err {
syslogLog.Err( fmt.Sprintf(" [enqueue] ERROR Inserting into Mongo: [%v]", err) )
//@TODO ###############################################################################################
}
syslogLog.Notice( fmt.Sprintf(" [enqueue] Inserted into Mongo: [%v]", mongoDoc) )
// Ack.
err = d.Ack(false)
if nil != err {
syslogLog.Err( fmt.Sprintf(" [enqueue] ERROR ACKing: [%v]", err) )
}
//DEBUG
syslogLog.Notice(" [enqueue] ACKed")
// sleepTime := time.Duration(5 + rand.Intn(7)) * time.Second
//
// //DEBUG
// syslogLog.Notice( fmt.Sprintf(" [enqueue] sleep for %v", sleepTime) )
//
// time.Sleep(sleepTime)
} // for
//DEBUG
syslogLog.Notice("[enqueue] END")
}