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