gofms/IncomingMsgProcessor.go at main · ztreinhart/gofms · GitHub

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package main

import (
	"fmt"
	"encoding/json"
)

import (
	"github.com/streadway/amqp"
	"bitbucket.org/smds/gofms/godelmar"
)

type IncomingMessageProcessor struct {
	ConnProps    amqp.URI
	IncomingConn *amqp.Connection
	IncomingChan *amqp.Channel
	IncomingQ    amqp.Queue
	Sched        FMSscheduler
	OutgoingPool *goDelMar.RMQConnectionPool
}

func (m *IncomingMessageProcessor) Init(inQname string, props amqp.URI,
	pool *goDelMar.RMQConnectionPool, s FMSscheduler) error {
	var err error

	m.ConnProps = props
	m.Sched = s
	m.OutgoingPool = pool

	fmt.Printf("%s: Dialing RMQ and opening connection.\n", inQname)
	m.IncomingConn, err = amqp.Dial(props.String())
	if err != nil {
		return err
	}

	fmt.Printf("%s: Opening incoming channel.\n", inQname)
	m.IncomingChan, err = m.IncomingConn.Channel()
	if err != nil {
		return err
	}

	fmt.Printf("%s: Declaring incoming queue.\n", inQname)
	m.IncomingQ, err = m.IncomingChan.QueueDeclare(
		inQname, // qname
		false,   // durable
		false,   // delete when unused
		false,   // exclusive
		false,   // no-wait
		nil,     // arguments
	)
	if err != nil {
		return err
	}

	return nil
}

func (m *IncomingMessageProcessor) ProcessMessages() {
	fmt.Printf("%s: Registering consumer.\n", m.IncomingQ.Name)
	msgs, err := m.IncomingChan.Consume(
		m.IncomingQ.Name, // queue
		"",               // consumer
		true,             // auto-ack
		false,            // exclusive
		false,            // no-local
		false,            // no-wait
		nil,              // args
	)
	goDelMar.FailOnError(err, "Failed to register a consumer.")

	//Process incoming payloads.
	fmt.Printf("%s: Entering message processing loop...\n", m.IncomingQ.Name)

	for d := range msgs {
		go m.processMessage(d)
	}
	fmt.Println("Message processing loop ending... This shouldn't happen?")
}

func (m *IncomingMessageProcessor) StopProcessing() {
	m.IncomingChan.Close()
	m.IncomingConn.Close()
}

func (m *IncomingMessageProcessor) processMessage(d amqp.Delivery) {
	fmt.Printf("%s: Received message\n", m.IncomingQ.Name)

	var incoming goDelMar.GenericMsg

	err := json.Unmarshal(d.Body, &incoming)
	goDelMar.FailOnError(err, "Failed to unmarshal incoming message")

	//fmt.Println(incoming.ModelPayload["26614f2c-5aff-4fc0-ba72-f16d9c22703f"])

	//Check for Job ID and assign one if there isn't one already.
	//id, err := uuid.FromString(incoming.JobID)
	//if err != nil {
	//	lastidx := len(incoming.SolverList) - 1
	//	id, err = uuid.FromString(incoming.SolverList[lastidx])
	//	if err != nil {
	//		id = uuid.Must(uuid.NewV4())
	//		incoming.JobID = id.String()
	//	} else {
	//
	//	}
	//
	//}

	//fmt.Printf("%s: %s\n", m.IncomingQ.Name, string(d.Body[:]))

	jobs := m.Sched.ScheduleGenericMsg(incoming)

	for _, j := range jobs {
		go m.sendJob(j)
		fmt.Printf("%s: Sent message to %s\n", m.IncomingQ.Name, j.Destination)
		//fmt.Printf("%s: %s\n", m.IncomingQ.Name, string(j.Body[:]))
	}
}

func (m *IncomingMessageProcessor) sendJob(j ScheduledJob) {
	conn := m.OutgoingPool.GetConnection()
	defer m.OutgoingPool.ReleaseConnection(conn)
	q := goDelMar.DeclareQueue(conn, j.Destination)
	goDelMar.SendToQueue(conn, q, j.Body)

}