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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
// gRPC Prometheus monitoring interceptors for client-side gRPC.
package grpc_prometheus
import (
prom "github.com/prometheus/client_golang/prometheus"
)
var (
// DefaultClientMetrics is the default instance of ClientMetrics. It is
// intended to be used in conjunction the default Prometheus metrics
// registry.
DefaultClientMetrics = NewClientMetrics()
// UnaryClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Unary RPCs.
UnaryClientInterceptor = DefaultClientMetrics.UnaryClientInterceptor()
// StreamClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Streaming RPCs.
StreamClientInterceptor = DefaultClientMetrics.StreamClientInterceptor()
)
func init() {
prom.MustRegister(DefaultClientMetrics.clientStartedCounter)
prom.MustRegister(DefaultClientMetrics.clientHandledCounter)
prom.MustRegister(DefaultClientMetrics.clientStreamMsgReceived)
prom.MustRegister(DefaultClientMetrics.clientStreamMsgSent)
}
// EnableClientHandlingTimeHistogram turns on recording of handling time of
// RPCs. Histogram metrics can be very expensive for Prometheus to retain and
// query. This function acts on the DefaultClientMetrics variable and the
// default Prometheus metrics registry.
func EnableClientHandlingTimeHistogram(opts ...HistogramOption) {
DefaultClientMetrics.EnableClientHandlingTimeHistogram(opts...)
prom.Register(DefaultClientMetrics.clientHandledHistogram)
}
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