distribution/notifications/endpoint.go
Noah Treuhaft 9a58c91051 notifications: fix expvar for Go 1.7
Remove EndpointConfig.Transport from the return value of the
registry.notifications.endpoints expvar.Func.  It results in an empty
value for that expvar variable under Go 1.7 because it is a non-nil
*http.Transport, which Go 1.7 can no longer encode as JSON.

Signed-off-by: Noah Treuhaft <noah.treuhaft@docker.com>
2017-02-14 10:51:20 -08:00

93 lines
2.3 KiB
Go

package notifications
import (
"net/http"
"time"
)
// EndpointConfig covers the optional configuration parameters for an active
// endpoint.
type EndpointConfig struct {
Headers http.Header
Timeout time.Duration
Threshold int
Backoff time.Duration
IgnoredMediaTypes []string
Transport *http.Transport `json:"-"`
}
// defaults set any zero-valued fields to a reasonable default.
func (ec *EndpointConfig) defaults() {
if ec.Timeout <= 0 {
ec.Timeout = time.Second
}
if ec.Threshold <= 0 {
ec.Threshold = 10
}
if ec.Backoff <= 0 {
ec.Backoff = time.Second
}
if ec.Transport == nil {
ec.Transport = http.DefaultTransport.(*http.Transport)
}
}
// Endpoint is a reliable, queued, thread-safe sink that notify external http
// services when events are written. Writes are non-blocking and always
// succeed for callers but events may be queued internally.
type Endpoint struct {
Sink
url string
name string
EndpointConfig
metrics *safeMetrics
}
// NewEndpoint returns a running endpoint, ready to receive events.
func NewEndpoint(name, url string, config EndpointConfig) *Endpoint {
var endpoint Endpoint
endpoint.name = name
endpoint.url = url
endpoint.EndpointConfig = config
endpoint.defaults()
endpoint.metrics = newSafeMetrics()
// Configures the inmemory queue, retry, http pipeline.
endpoint.Sink = newHTTPSink(
endpoint.url, endpoint.Timeout, endpoint.Headers,
endpoint.Transport, endpoint.metrics.httpStatusListener())
endpoint.Sink = newRetryingSink(endpoint.Sink, endpoint.Threshold, endpoint.Backoff)
endpoint.Sink = newEventQueue(endpoint.Sink, endpoint.metrics.eventQueueListener())
endpoint.Sink = newIgnoredMediaTypesSink(endpoint.Sink, config.IgnoredMediaTypes)
register(&endpoint)
return &endpoint
}
// Name returns the name of the endpoint, generally used for debugging.
func (e *Endpoint) Name() string {
return e.name
}
// URL returns the url of the endpoint.
func (e *Endpoint) URL() string {
return e.url
}
// ReadMetrics populates em with metrics from the endpoint.
func (e *Endpoint) ReadMetrics(em *EndpointMetrics) {
e.metrics.Lock()
defer e.metrics.Unlock()
*em = e.metrics.EndpointMetrics
// Map still need to copied in a threadsafe manner.
em.Statuses = make(map[string]int)
for k, v := range e.metrics.Statuses {
em.Statuses[k] = v
}
}