func (server *serverCodec) WriteResponse(resp *rpc.Response, v interface{}) error {
body, err := server.codec.codec.Marshal(v)
if err != nil {
return err
}
server.lock.RLock()
route, ok := server.calls[resp.Seq]
server.lock.RUnlock()
if !ok {
return errors.New("sequence dosen't have a route")
}
publishing := amqp.Publishing{
ReplyTo: resp.ServiceMethod,
MessageId: route.messageID,
CorrelationId: route.routing,
Body: body,
}
if resp.Error != "" {
publishing.Headers = amqp.Table{"error": resp.Error}
}
return server.channel.Publish(
"",
route.routing,
false,
false,
publishing,
)
}
func PublishFiles(files chan string, connectionUri, exchange,
routingKey string, mandatory, immediate bool, deliveryProperties DeliveryProperties, results chan *PublishResult) {
var err error
var body []byte
var message *amqp.Publishing
var messages chan *amqp.Publishing
messages = make(chan *amqp.Publishing)
go Publish(messages, connectionUri, exchange, routingKey, mandatory, immediate, results)
for file := range files {
if body, err = ioutil.ReadFile(file); err != nil {
results <- &PublishResult{"Failed to read file " + file, err, false}
continue
}
message = NewAmqpPublishingWithDelivery(deliveryProperties, body)
if message.ContentType == "" {
message.ContentType = mime.TypeByExtension(filepath.Ext(file))
}
messages <- message
}
}
// Publish will send the message to the server to be consumed
func (p *Publisher) Publish(in interface{}) error {
// Check for close
if p.channel == nil {
return ChannelClosed
}
// Encode the message
conf := p.conf
buf := &p.buf
buf.Reset()
if err := conf.Serializer.RelayEncode(buf, in); err != nil {
return fmt.Errorf("Failed to encode message! Got: %s", err)
}
// Format the message
msg := amqp.Publishing{
DeliveryMode: p.mode,
Timestamp: time.Now().UTC(),
ContentType: p.contentType,
Body: buf.Bytes(),
}
// Check for a message ttl
if p.conf.MessageTTL > 0 {
msec := int(p.conf.MessageTTL / time.Millisecond)
msg.Expiration = strconv.Itoa(msec)
}
// Publish the message
if err := p.channel.Publish(conf.Exchange, p.queue, false, false, msg); err != nil {
return fmt.Errorf("Failed to publish to '%s'! Got: %s", p.queue, err)
}
// Check if we wait for confirmation
if !p.conf.DisablePublishConfirm {
select {
case _, ok := <-p.ackCh:
if !ok {
return ChannelClosed
}
return nil
case _, ok := <-p.nackCh:
if !ok {
return ChannelClosed
}
return fmt.Errorf("Failed to publish to '%s'! Got negative ack.", p.queue)
case err, ok := <-p.errCh:
if !ok {
return ChannelClosed
}
log.Printf("[ERR] Publisher got error: (Code %d Server: %v Recoverable: %v) %s",
err.Code, err.Server, err.Recover, err.Reason)
return fmt.Errorf("Failed to publish to '%s'! Got: %s", err.Error())
}
}
return nil
}
func (s *client) send(ch *amqp.Channel, group uint64, o *Options, payload []byte) ([]byte, error) {
id, err := s.flake.Next()
if err != nil {
return nil, err
}
groupString := fmt.Sprintf("%d", group)
envelope := amqp.Publishing{
MessageId: fmt.Sprintf("%d", id),
CorrelationId: groupString,
Body: payload,
DeliveryMode: amqp.Transient,
Headers: amqp.Table{timestampHeader: time.Now().UnixNano()},
}
if o.Persistent {
envelope.DeliveryMode = amqp.Persistent
}
mandatory := false
immediate := false
if err := ch.Publish(o.Exchange, o.Key, mandatory, immediate, envelope); err != nil {
return nil, fmt.Errorf("Could not publish to exchange %s: %s", o.Exchange, err)
}
h := murmur3.New32()
h.Write(payload)
sum := h.Sum(nil)
size := float32(len(payload)) / 1024
if len(o.Verbose) > 0 {
log.Infof("[%d] sending %.2f kB (%x) to %s", id, size, sum, o.Key)
} else {
log.Infof("[%d] sending %.2f kB (%x)", id, size, sum)
}
return sum, nil
}
func main() {
rabbitUrl := os.Getenv("AMQP_URL")
if rabbitUrl == "" {
rabbitUrl = "amqp://localhost"
}
log.Println(fmt.Sprintf("Connecting to RabbitMQ (%s)", rabbitUrl))
conn, err := amqp.Dial(rabbitUrl)
if err != nil {
panic(err)
}
defer conn.Close()
channel, err := conn.Channel()
if err != nil {
panic(err)
}
defer channel.Close()
// The exchange we're going to pull stuff from...
err = channel.ExchangeDeclare("squall.workers", "fanout", true, false, false, false, nil)
if err != nil {
panic(err)
}
// The exchange we're going to publish to...
err = channel.ExchangeDeclare("squall.aggregators", "direct", true, false, false, false, nil)
if err != nil {
panic(err)
}
// Just ignore this crap.
_, err = channel.QueueDeclare("", true, false, false, true, nil)
if err != nil {
panic(err)
}
err = channel.QueueBind("", "#", "squall.workers", true, nil)
if err != nil {
panic(err)
}
// Start up dat consumer...!
listener, err := channel.Consume("", "squall.workers", true, false, true, false, nil)
if err != nil {
panic(err)
}
for {
select {
case obj, ok := <-listener:
{
Debugln("Found request to execute.")
if ok {
request := NewScrapeRequestFromJson(obj.Body)
log.Printf("Request %d: Starting scrape of %s\n", request.RequestID, request.Url)
request.PerformAsync(100)
}
}
case resp := <-ResponseQueue:
{
Debugln("Read response, sending along.")
// Do something with this response. Shove it down another pipe?
message := amqp.Publishing{}
message.Body = resp.ToJSON()
message.ContentType = "application/json"
channel.Publish("squall.aggregators", "", false, false, message)
}
}
}
}