141 lines
4.4 KiB
Go
141 lines
4.4 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package middleware
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import (
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"context"
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"sync/atomic"
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"github.com/armon/go-metrics"
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"github.com/armon/go-metrics/prometheus"
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"google.golang.org/grpc"
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"google.golang.org/grpc/stats"
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)
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var StatsGauges = []prometheus.GaugeDefinition{
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{
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Name: []string{"grpc", "server", "connections"},
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Help: "Measures the number of active gRPC connections open on the server.",
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},
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{
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Name: []string{"grpc", "client", "connections"},
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Help: "Measures the number of active gRPC connections open from the client agent to any Consul servers.",
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},
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{
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Name: []string{"grpc", "server", "streams"},
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Help: "Measures the number of active gRPC streams handled by the server.",
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},
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}
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var StatsCounters = []prometheus.CounterDefinition{
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{
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Name: []string{"grpc", "client", "request", "count"},
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Help: "Counts the number of gRPC requests made by the client agent to a Consul server.",
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},
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{
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Name: []string{"grpc", "server", "request", "count"},
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Help: "Counts the number of gRPC requests received by the server.",
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},
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{
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Name: []string{"grpc", "client", "connection", "count"},
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Help: "Counts the number of new gRPC connections opened by the client agent to a Consul server.",
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},
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{
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Name: []string{"grpc", "server", "connection", "count"},
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Help: "Counts the number of new gRPC connections received by the server.",
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},
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{
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Name: []string{"grpc", "server", "stream", "count"},
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Help: "Counts the number of new gRPC streams received by the server.",
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},
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}
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// statsHandler is a grpc/stats.StatsHandler which emits connection and
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// request metrics to go-metrics.
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type statsHandler struct {
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// activeConns is used with sync/atomic and MUST be 64-bit aligned. To ensure
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// alignment on 32-bit platforms this field must remain the first field in
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// the struct. See https://golang.org/pkg/sync/atomic/#pkg-note-BUG.
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activeConns uint64
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metrics *metrics.Metrics
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labels []metrics.Label
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}
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func NewStatsHandler(m *metrics.Metrics, labels []metrics.Label) *statsHandler {
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return &statsHandler{metrics: m, labels: labels}
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}
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// TagRPC implements grpcStats.StatsHandler
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func (c *statsHandler) TagRPC(ctx context.Context, _ *stats.RPCTagInfo) context.Context {
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// No-op
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return ctx
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}
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// HandleRPC implements grpcStats.StatsHandler
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func (c *statsHandler) HandleRPC(_ context.Context, s stats.RPCStats) {
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label := "server"
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if s.IsClient() {
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label = "client"
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}
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switch s.(type) {
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case *stats.InHeader:
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c.metrics.IncrCounterWithLabels([]string{"grpc", label, "request", "count"}, 1, c.labels)
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}
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}
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// TagConn implements grpcStats.StatsHandler
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func (c *statsHandler) TagConn(ctx context.Context, _ *stats.ConnTagInfo) context.Context {
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// No-op
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return ctx
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}
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// HandleConn implements grpcStats.StatsHandler
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func (c *statsHandler) HandleConn(_ context.Context, s stats.ConnStats) {
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label := "server"
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if s.IsClient() {
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label = "client"
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}
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var count uint64
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switch s.(type) {
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case *stats.ConnBegin:
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count = atomic.AddUint64(&c.activeConns, 1)
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c.metrics.IncrCounterWithLabels([]string{"grpc", label, "connection", "count"}, 1, c.labels)
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case *stats.ConnEnd:
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// Decrement!
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count = atomic.AddUint64(&c.activeConns, ^uint64(0))
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}
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c.metrics.SetGaugeWithLabels([]string{"grpc", label, "connections"}, float32(count), c.labels)
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}
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type activeStreamCounter struct {
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// count is used with sync/atomic and MUST be 64-bit aligned. To ensure
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// alignment on 32-bit platforms this field must remain the first field in
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// the struct. See https://golang.org/pkg/sync/atomic/#pkg-note-BUG.
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count uint64
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metrics *metrics.Metrics
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labels []metrics.Label
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}
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func NewActiveStreamCounter(m *metrics.Metrics, labels []metrics.Label) *activeStreamCounter {
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return &activeStreamCounter{metrics: m, labels: labels}
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}
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// GRPCCountingStreamInterceptor is a grpc.ServerStreamInterceptor that emits a
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// a metric of the count of open streams.
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func (i *activeStreamCounter) Intercept(
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srv interface{},
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ss grpc.ServerStream,
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_ *grpc.StreamServerInfo,
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handler grpc.StreamHandler,
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) error {
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count := atomic.AddUint64(&i.count, 1)
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i.metrics.SetGaugeWithLabels([]string{"grpc", "server", "streams"}, float32(count), i.labels)
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i.metrics.IncrCounterWithLabels([]string{"grpc", "server", "stream", "count"}, 1, i.labels)
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defer func() {
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count := atomic.AddUint64(&i.count, ^uint64(0))
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i.metrics.SetGaugeWithLabels([]string{"grpc", "server", "streams"}, float32(count), i.labels)
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}()
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return handler(srv, ss)
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}
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