open-consul/agent/grpc/stats.go

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package grpc
import (
"context"
"sync/atomic"
"github.com/armon/go-metrics"
"google.golang.org/grpc"
"google.golang.org/grpc/stats"
)
var defaultMetrics = metrics.Default()
// statsHandler is a grpc/stats.StatsHandler which emits connection and
// request metrics to go-metrics.
type statsHandler struct {
metrics *metrics.Metrics
activeConns uint64 // must be 8-byte aligned for atomic access
}
func newStatsHandler(m *metrics.Metrics) *statsHandler {
return &statsHandler{metrics: m}
}
// TagRPC implements grpcStats.StatsHandler
func (c *statsHandler) TagRPC(ctx context.Context, _ *stats.RPCTagInfo) context.Context {
// No-op
return ctx
}
// HandleRPC implements grpcStats.StatsHandler
func (c *statsHandler) HandleRPC(_ context.Context, s stats.RPCStats) {
label := "server"
if s.IsClient() {
label = "client"
}
switch s.(type) {
case *stats.InHeader:
c.metrics.IncrCounter([]string{"grpc", label, "request", "count"}, 1)
}
}
// TagConn implements grpcStats.StatsHandler
func (c *statsHandler) TagConn(ctx context.Context, _ *stats.ConnTagInfo) context.Context {
// No-op
return ctx
}
// HandleConn implements grpcStats.StatsHandler
func (c *statsHandler) HandleConn(_ context.Context, s stats.ConnStats) {
label := "server"
if s.IsClient() {
label = "client"
}
var count uint64
switch s.(type) {
case *stats.ConnBegin:
count = atomic.AddUint64(&c.activeConns, 1)
c.metrics.IncrCounter([]string{"grpc", label, "connection", "count"}, 1)
case *stats.ConnEnd:
// Decrement!
count = atomic.AddUint64(&c.activeConns, ^uint64(0))
}
c.metrics.SetGauge([]string{"grpc", label, "connections"}, float32(count))
}
type activeStreamCounter struct {
metrics *metrics.Metrics
// count of the number of open streaming RPCs on a server. It is accessed
// atomically.
count uint64
}
// GRPCCountingStreamInterceptor is a grpc.ServerStreamInterceptor that emits a
// a metric of the count of open streams.
func (i *activeStreamCounter) Intercept(
srv interface{},
ss grpc.ServerStream,
_ *grpc.StreamServerInfo,
handler grpc.StreamHandler,
) error {
count := atomic.AddUint64(&i.count, 1)
i.metrics.SetGauge([]string{"grpc", "server", "streams"}, float32(count))
i.metrics.IncrCounter([]string{"grpc", "server", "stream", "count"}, 1)
defer func() {
count := atomic.AddUint64(&i.count, ^uint64(0))
i.metrics.SetGauge([]string{"grpc", "server", "streams"}, float32(count))
}()
return handler(srv, ss)
}