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messaging.go
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messaging.go
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package flow
import (
"log"
"sync"
amqp "github.com/interconnectedcloud/go-amqp"
"github.com/skupperproject/skupper/pkg/event"
"github.com/skupperproject/skupper/pkg/messaging"
)
const (
BeaconAddress string = "mc/sfe.all"
RecordPrefix string = "mc/sfe."
DirectPrefix string = "sfe."
)
type base struct {
stopOnce sync.Once
done chan struct{}
connectionFactory messaging.ConnectionFactory
incoming chan []interface{}
outgoing chan interface{}
address string
}
func (c *base) stop() {
c.stopOnce.Do(func() { close(c.done) })
}
type sender struct {
base
sendSettled bool
}
func (c *sender) start() {
go c.send()
}
func newSender(connectionFactory messaging.ConnectionFactory, address string, sendSettled bool, update chan interface{}) *sender {
return &sender{
base: base{
done: make(chan struct{}),
connectionFactory: connectionFactory,
outgoing: update,
address: address,
},
sendSettled: sendSettled,
}
}
func (c *sender) send() {
for {
select {
case <-c.done:
log.Println("COLLECTOR: Flow process stopped sending")
return
default:
if err := c._send(); err != nil {
log.Printf("COLLECTOR: Error sending out updates %s", err.Error())
}
}
}
}
func (c *sender) _send() error {
client, err := c.connectionFactory.Connect()
if err != nil {
return err
}
log.Printf("COLLECTOR: Connection for sender %s to %s established\n", c.address, c.connectionFactory.Url())
defer client.Close()
sender, err := client.Sender(c.address)
if err != nil {
return err
}
defer sender.Close()
var request *amqp.Message
for {
select {
case <-c.done:
return nil
case update := <-c.outgoing:
if beacon, ok := update.(*BeaconRecord); ok {
msg, err := encodeBeacon(beacon)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
if heartbeat, ok := update.(*HeartbeatRecord); ok {
msg, err := encodeHeartbeat(heartbeat)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
if fr, ok := update.(*FlushRecord); ok {
msg, err := encodeFlush(fr)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
if site, ok := update.(*SiteRecord); ok {
msg, err := encodeSite(site)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
if process, ok := update.(*ProcessRecord); ok {
msg, err := encodeProcess(process)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
if host, ok := update.(*HostRecord); ok {
msg, err := encodeHost(host)
if err != nil {
event.Recordf(FlowControllerEvent, "Failed to encode message for flow controller: %s", err.Error())
} else {
request = msg
}
}
}
if request != nil {
request.SendSettled = c.sendSettled
err = sender.Send(request)
if err != nil {
return err
}
request = nil
}
}
}
type receiver struct {
base
}
func newReceiver(connectionFactory messaging.ConnectionFactory, address string, updates chan []interface{}) *receiver {
return &receiver{
base: base{
done: make(chan struct{}),
connectionFactory: connectionFactory,
incoming: updates,
address: address,
},
}
}
func (r *receiver) start() {
go r.receive()
}
func (r *receiver) receive() {
for {
select {
case <-r.done:
return
default:
if err := r._receive(); err != nil {
log.Printf("COLLECTOR: Receiver %s %s\n", r.address, err.Error())
}
}
}
}
func (r *receiver) _receive() error {
client, err := r.connectionFactory.Connect()
if err != nil {
return err
}
log.Printf("COLLECTOR: Connection for receiver %s to %s established\n", r.address, r.connectionFactory.Url())
defer client.Close()
receiver, err := client.Receiver(r.address, 250)
if err != nil {
return err
}
defer receiver.Close()
for {
select {
case <-r.done:
return nil
default:
}
msg, err := receiver.Receive()
if err != nil {
return err
}
receiver.Accept(msg)
results := decode(msg)
r.incoming <- results
}
}