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subscribe.go
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subscribe.go
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package service
import (
"path"
"github.com/coreos/go-etcd/etcd"
)
func Subscribe(service string) (<-chan *etcd.Response, <-chan *etcd.EtcdError) {
stop := make(chan bool)
responses := make(chan *etcd.Response)
errors := make(chan *etcd.EtcdError)
go func() {
_, err := Client().Watch("/services/"+service, 0, true, responses, stop)
if err != nil {
errors <- err.(*etcd.EtcdError)
close(errors)
close(stop)
return
}
}()
return responses, errors
}
func SubscribeDown(service string) (<-chan string, <-chan *etcd.EtcdError) {
expirations := make(chan string)
responses, errors := Subscribe(service)
go func() {
for response := range responses {
if response.Action == "expire" || response.Action == "delete" {
expirations <- path.Base(response.Node.Key)
}
}
}()
return expirations, errors
}
func SubscribeNew(service string) (<-chan *Host, <-chan *etcd.EtcdError) {
hosts := make(chan *Host)
responses, errors := Subscribe(service)
go func() {
for response := range responses {
if response.Action == "create" || (response.PrevNode == nil && response.Action == "set") {
hosts <- buildHostFromNode(response.Node)
}
}
}()
return hosts, errors
}
func SubscribeUpdate(service string) (<-chan *Host, <-chan *etcd.EtcdError) {
hosts := make(chan *Host)
responses, errors := Subscribe(service)
go func() {
for response := range responses {
if response.Action == "update" || (response.PrevNode != nil && response.Action == "set") {
hosts <- buildHostFromNode(response.Node)
}
}
}()
return hosts, errors
}