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timeout_nats_client.go
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timeout_nats_client.go
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package mbus
import (
"code.cloudfoundry.org/clock"
"github.com/cloudfoundry/yagnats"
"time"
)
var _ yagnats.NATSClient = &TimeoutNatsClient{}
type TimeoutNatsClient struct {
client yagnats.NATSClient
clock clock.Clock
}
func NewTimeoutNatsClient(client yagnats.NATSClient, clock clock.Clock) *TimeoutNatsClient {
return &TimeoutNatsClient{
client: client,
clock: clock,
}
}
func (c *TimeoutNatsClient) Ping() bool {
complete := make(chan bool)
go func() {
complete <- c.client.Ping()
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case success := <-complete:
timeout.Stop()
return success
case <-timeout.C():
panic("Connect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Connect(connectionProvider yagnats.ConnectionProvider) error {
complete := make(chan error)
go func() {
complete <- c.client.Connect(connectionProvider)
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Connect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Disconnect() {
complete := make(chan bool)
go func() {
c.client.Disconnect()
complete <- true
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case <-complete:
timeout.Stop()
return
case <-timeout.C():
panic("Disconnect call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Publish(subject string, payload []byte) error {
complete := make(chan error)
go func() {
complete <- c.client.Publish(subject, payload)
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Publish call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) PublishWithReplyTo(subject, reply string, payload []byte) error {
panic("not implemented")
}
func (c *TimeoutNatsClient) Subscribe(subject string, callback yagnats.Callback) (int64, error) {
type result struct {
subscriberID int64
err error
}
complete := make(chan result)
go func() {
id, err := c.client.Subscribe(subject, callback)
complete <- result{
subscriberID: id,
err: err,
}
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case result := <-complete:
timeout.Stop()
return result.subscriberID, result.err
case <-timeout.C():
panic("Subscribe call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) SubscribeWithQueue(subject, queue string, callback yagnats.Callback) (int64, error) {
type result struct {
subscriberID int64
err error
}
complete := make(chan result)
go func() {
id, err := c.client.SubscribeWithQueue(subject, queue, callback)
complete <- result{
subscriberID: id,
err: err,
}
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case result := <-complete:
timeout.Stop()
return result.subscriberID, result.err
case <-timeout.C():
panic("SubscribeWithQueue call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) Unsubscribe(subscription int64) error {
complete := make(chan error)
go func() {
complete <- c.client.Unsubscribe(subscription)
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case err := <-complete:
timeout.Stop()
return err
case <-timeout.C():
panic("Unsubscribe call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) UnsubscribeAll(subject string) {
complete := make(chan bool)
go func() {
c.client.UnsubscribeAll(subject)
complete <- true
}()
timeout := c.clock.NewTimer(5 * time.Minute)
select {
case <-complete:
timeout.Stop()
return
case <-timeout.C():
panic("UnsubscribeAll call to NATSClient took too long, exiting so connections are reset")
}
}
func (c *TimeoutNatsClient) BeforeConnectCallback(callback func()) {
c.client.BeforeConnectCallback(callback)
}