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subscription.go
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subscription.go
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package subscription
import (
"log"
"github.com/nats-io/nats"
)
var channel chan subReq
type subReq struct {
Subject string
Handler nats.MsgHandler
Response chan<- error
}
// New constructs a new subscription request
func New(sub string, handler nats.MsgHandler) error {
errors := make(chan error, 1)
channel <- subReq{
Subject: sub,
Handler: handler,
Response: errors,
}
return <-errors
}
// Manage is the primary server manager around the NATS messaging server
// Designed to be run in a go-routine
func Manage(conn *nats.Conn) {
var subs []*nats.Subscription
for req := range channel {
log.Printf("Subscription Request: %s\n", req.Subject)
sub, err := conn.Subscribe(req.Subject, req.Handler)
req.Response <- err
close(req.Response)
if err == nil {
subs = append(subs, sub)
}
}
log.Println("Subscriptions shutdown request received")
for _, sub := range subs {
log.Printf("Subscription unsub: %s : %v", sub.Subject, sub.Unsubscribe())
}
}
// Kill destroys the channel
func Kill() {
close(channel)
}
func init() {
channel = make(chan subReq)
}