90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
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"}, 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)
|
|
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))
|
|
defer func() {
|
|
count := atomic.AddUint64(&i.count, ^uint64(0))
|
|
i.metrics.SetGauge([]string{"grpc", "server", "streams"}, float32(count))
|
|
}()
|
|
|
|
return handler(srv, ss)
|
|
}
|