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49 lines
1.9 KiB
Go
49 lines
1.9 KiB
Go
// Copyright 2016 Michal Witkowski. All Rights Reserved.
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// See LICENSE for licensing terms.
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// gRPC Prometheus monitoring interceptors for server-side gRPC.
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package grpc_prometheus
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import (
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prom "github.com/prometheus/client_golang/prometheus"
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"google.golang.org/grpc"
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)
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var (
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// DefaultServerMetrics is the default instance of ServerMetrics. It is
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// intended to be used in conjunction the default Prometheus metrics
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// registry.
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DefaultServerMetrics = NewServerMetrics()
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// UnaryServerInterceptor is a gRPC server-side interceptor that provides Prometheus monitoring for Unary RPCs.
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UnaryServerInterceptor = DefaultServerMetrics.UnaryServerInterceptor()
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// StreamServerInterceptor is a gRPC server-side interceptor that provides Prometheus monitoring for Streaming RPCs.
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StreamServerInterceptor = DefaultServerMetrics.StreamServerInterceptor()
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)
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func init() {
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prom.MustRegister(DefaultServerMetrics.serverStartedCounter)
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prom.MustRegister(DefaultServerMetrics.serverHandledCounter)
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prom.MustRegister(DefaultServerMetrics.serverStreamMsgReceived)
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prom.MustRegister(DefaultServerMetrics.serverStreamMsgSent)
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}
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// Register takes a gRPC server and pre-initializes all counters to 0. This
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// allows for easier monitoring in Prometheus (no missing metrics), and should
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// be called *after* all services have been registered with the server. This
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// function acts on the DefaultServerMetrics variable.
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func Register(server *grpc.Server) {
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DefaultServerMetrics.InitializeMetrics(server)
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}
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// EnableHandlingTimeHistogram turns on recording of handling time
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// of RPCs. Histogram metrics can be very expensive for Prometheus
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// to retain and query. This function acts on the DefaultServerMetrics
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// variable and the default Prometheus metrics registry.
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func EnableHandlingTimeHistogram(opts ...HistogramOption) {
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DefaultServerMetrics.EnableHandlingTimeHistogram(opts...)
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prom.Register(DefaultServerMetrics.serverHandledHistogram)
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}
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