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client_metrics.go
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client_metrics.go
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package grpc_prometheus
import (
"context"
"io"
prom "github.com/prometheus/client_golang/prometheus"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/status"
)
// ClientMetrics represents a collection of metrics to be registered on a
// Prometheus metrics registry for a gRPC client.
type ClientMetrics struct {
clientStartedCounter *prom.CounterVec
clientStartedCounterOpts prom.CounterOpts
clientHandledCounter *prom.CounterVec
clientStreamMsgReceived *prom.CounterVec
clientStreamMsgSent *prom.CounterVec
clientHandledHistogramEnabled bool
clientHandledHistogramOpts prom.HistogramOpts
clientHandledHistogram *prom.HistogramVec
clientStreamRecvHistogramEnabled bool
clientStreamRecvHistogramOpts prom.HistogramOpts
clientStreamRecvHistogram *prom.HistogramVec
clientStreamSendHistogramEnabled bool
clientStreamSendHistogramOpts prom.HistogramOpts
clientStreamSendHistogram *prom.HistogramVec
clientMsgSizeReceivedHistogramEnabled bool
clientMsgSizeReceivedHistogramOpts prom.HistogramOpts
clientMsgSizeReceivedHistogram *prom.HistogramVec
clientMsgSizeSentHistogramEnabled bool
clientMsgSizeSentHistogramOpts prom.HistogramOpts
clientMsgSizeSentHistogram *prom.HistogramVec
}
// NewClientMetrics returns a ClientMetrics object. Use a new instance of
// ClientMetrics when not using the default Prometheus metrics registry, for
// example when wanting to control which metrics are added to a registry as
// opposed to automatically adding metrics via init functions.
func NewClientMetrics(counterOpts ...CounterOption) *ClientMetrics {
opts := counterOptions(counterOpts)
return &ClientMetrics{
clientStartedCounter: prom.NewCounterVec(
opts.apply(prom.CounterOpts{
Name: "grpc_client_started_total",
Help: "Total number of RPCs started on the client.",
}), []string{"grpc_type", "grpc_service", "grpc_method"}),
clientHandledCounter: prom.NewCounterVec(
opts.apply(prom.CounterOpts{
Name: "grpc_client_handled_total",
Help: "Total number of RPCs completed by the client, regardless of success or failure.",
}), []string{"grpc_type", "grpc_service", "grpc_method", "grpc_code"}),
clientStreamMsgReceived: prom.NewCounterVec(
opts.apply(prom.CounterOpts{
Name: "grpc_client_msg_received_total",
Help: "Total number of RPC stream messages received by the client.",
}), []string{"grpc_type", "grpc_service", "grpc_method"}),
clientStreamMsgSent: prom.NewCounterVec(
opts.apply(prom.CounterOpts{
Name: "grpc_client_msg_sent_total",
Help: "Total number of gRPC stream messages sent by the client.",
}), []string{"grpc_type", "grpc_service", "grpc_method"}),
clientHandledHistogramEnabled: false,
clientHandledHistogramOpts: prom.HistogramOpts{
Name: "grpc_client_handling_seconds",
Help: "Histogram of response latency (seconds) of the gRPC until it is finished by the application.",
Buckets: prom.DefBuckets,
},
clientHandledHistogram: nil,
clientStreamRecvHistogramEnabled: false,
clientStreamRecvHistogramOpts: prom.HistogramOpts{
Name: "grpc_client_msg_recv_handling_seconds",
Help: "Histogram of response latency (seconds) of the gRPC single message receive.",
Buckets: prom.DefBuckets,
},
clientStreamRecvHistogram: nil,
clientStreamSendHistogramEnabled: false,
clientStreamSendHistogramOpts: prom.HistogramOpts{
Name: "grpc_client_msg_send_handling_seconds",
Help: "Histogram of response latency (seconds) of the gRPC single message send.",
Buckets: prom.DefBuckets,
},
clientStreamSendHistogram: nil,
clientMsgSizeReceivedHistogramEnabled: false,
clientMsgSizeReceivedHistogramOpts: prom.HistogramOpts{
Name: "grpc_client_msg_size_received_bytes",
Help: "Histogram of message sizes received by the client.",
Buckets: defMsgBytesBuckets,
},
clientMsgSizeReceivedHistogram: nil,
clientMsgSizeSentHistogramEnabled: false,
clientMsgSizeSentHistogramOpts: prom.HistogramOpts{
Name: "grpc_client_msg_size_sent_bytes",
Help: "Histogram of message sizes sent by the client.",
Buckets: defMsgBytesBuckets,
},
clientMsgSizeSentHistogram: nil,
}
}
// Describe sends the super-set of all possible descriptors of metrics
// collected by this Collector to the provided channel and returns once
// the last descriptor has been sent.
func (m *ClientMetrics) Describe(ch chan<- *prom.Desc) {
m.clientStartedCounter.Describe(ch)
m.clientHandledCounter.Describe(ch)
m.clientStreamMsgReceived.Describe(ch)
m.clientStreamMsgSent.Describe(ch)
if m.clientHandledHistogramEnabled {
m.clientHandledHistogram.Describe(ch)
}
if m.clientStreamRecvHistogramEnabled {
m.clientStreamRecvHistogram.Describe(ch)
}
if m.clientStreamSendHistogramEnabled {
m.clientStreamSendHistogram.Describe(ch)
}
if m.clientMsgSizeReceivedHistogramEnabled {
m.clientMsgSizeReceivedHistogram.Describe(ch)
}
if m.clientMsgSizeSentHistogramEnabled {
m.clientMsgSizeSentHistogram.Describe(ch)
}
}
// Collect is called by the Prometheus registry when collecting
// metrics. The implementation sends each collected metric via the
// provided channel and returns once the last metric has been sent.
func (m *ClientMetrics) Collect(ch chan<- prom.Metric) {
m.clientStartedCounter.Collect(ch)
m.clientHandledCounter.Collect(ch)
m.clientStreamMsgReceived.Collect(ch)
m.clientStreamMsgSent.Collect(ch)
if m.clientHandledHistogramEnabled {
m.clientHandledHistogram.Collect(ch)
}
if m.clientStreamRecvHistogramEnabled {
m.clientStreamRecvHistogram.Collect(ch)
}
if m.clientStreamSendHistogramEnabled {
m.clientStreamSendHistogram.Collect(ch)
}
if m.clientMsgSizeReceivedHistogramEnabled {
m.clientMsgSizeReceivedHistogram.Collect(ch)
}
if m.clientMsgSizeSentHistogramEnabled {
m.clientMsgSizeSentHistogram.Collect(ch)
}
}
// EnableClientHandlingTimeHistogram turns on recording of handling time of RPCs.
// Histogram metrics can be very expensive for Prometheus to retain and query.
func (m *ClientMetrics) EnableClientHandlingTimeHistogram(opts ...HistogramOption) {
for _, o := range opts {
o(&m.clientHandledHistogramOpts)
}
if !m.clientHandledHistogramEnabled {
m.clientHandledHistogram = prom.NewHistogramVec(
m.clientHandledHistogramOpts,
[]string{"grpc_type", "grpc_service", "grpc_method"},
)
}
m.clientHandledHistogramEnabled = true
}
// EnableClientStreamReceiveTimeHistogram turns on recording of single message receive time of streaming RPCs.
// Histogram metrics can be very expensive for Prometheus to retain and query.
func (m *ClientMetrics) EnableClientStreamReceiveTimeHistogram(opts ...HistogramOption) {
for _, o := range opts {
o(&m.clientStreamRecvHistogramOpts)
}
if !m.clientStreamRecvHistogramEnabled {
m.clientStreamRecvHistogram = prom.NewHistogramVec(
m.clientStreamRecvHistogramOpts,
[]string{"grpc_type", "grpc_service", "grpc_method"},
)
}
m.clientStreamRecvHistogramEnabled = true
}
// EnableClientStreamSendTimeHistogram turns on recording of single message send time of streaming RPCs.
// Histogram metrics can be very expensive for Prometheus to retain and query.
func (m *ClientMetrics) EnableClientStreamSendTimeHistogram(opts ...HistogramOption) {
for _, o := range opts {
o(&m.clientStreamSendHistogramOpts)
}
if !m.clientStreamSendHistogramEnabled {
m.clientStreamSendHistogram = prom.NewHistogramVec(
m.clientStreamSendHistogramOpts,
[]string{"grpc_type", "grpc_service", "grpc_method"},
)
}
m.clientStreamSendHistogramEnabled = true
}
// EnableMsgSizeReceivedBytesHistogram turns on recording of received message size of RPCs.
// Histogram metrics can be very expensive for Prometheus to retain and query. It takes
// options to configure histogram options such as the defined buckets.
func (m *ClientMetrics) EnableMsgSizeReceivedBytesHistogram(opts ...HistogramOption) {
for _, o := range opts {
o(&m.clientMsgSizeReceivedHistogramOpts)
}
if !m.clientMsgSizeReceivedHistogramEnabled {
m.clientMsgSizeReceivedHistogram = prom.NewHistogramVec(
m.clientMsgSizeReceivedHistogramOpts,
[]string{"grpc_service", "grpc_method", "grpc_stats"},
)
}
m.clientMsgSizeReceivedHistogramEnabled = true
}
// EnableMsgSizeSentBytesHistogram turns on recording of sent message size of RPCs.
// Histogram metrics can be very expensive for Prometheus to retain and query. It
// takes options to configure histogram options such as the defined buckets.
func (m *ClientMetrics) EnableMsgSizeSentBytesHistogram(opts ...HistogramOption) {
for _, o := range opts {
o(&m.clientMsgSizeSentHistogramOpts)
}
if !m.clientMsgSizeSentHistogramEnabled {
m.clientMsgSizeSentHistogram = prom.NewHistogramVec(
m.clientMsgSizeSentHistogramOpts,
[]string{"grpc_service", "grpc_method", "grpc_stats"},
)
}
m.clientMsgSizeSentHistogramEnabled = true
}
// UnaryClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Unary RPCs.
func (m *ClientMetrics) UnaryClientInterceptor() func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
monitor := newClientReporter(m, Unary, method)
monitor.SentMessage()
err := invoker(ctx, method, req, reply, cc, opts...)
if err == nil {
monitor.ReceivedMessage()
}
st, _ := status.FromError(err)
monitor.Handled(st.Code())
return err
}
}
// StreamClientInterceptor is a gRPC client-side interceptor that provides Prometheus monitoring for Streaming RPCs.
func (m *ClientMetrics) StreamClientInterceptor() func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
monitor := newClientReporter(m, clientStreamType(desc), method)
clientStream, err := streamer(ctx, desc, cc, method, opts...)
if err != nil {
st, _ := status.FromError(err)
monitor.Handled(st.Code())
return nil, err
}
return &monitoredClientStream{clientStream, monitor}, nil
}
}
// NewClientStatsHandler is a gRPC client-side stats.Handler that providers Prometheus monitoring for RPCs.
func (m *ClientMetrics) NewClientStatsHandler() stats.Handler {
return &clientStatsHandler{
clientMetrics: m,
}
}
func clientStreamType(desc *grpc.StreamDesc) grpcType {
if desc.ClientStreams && !desc.ServerStreams {
return ClientStream
} else if !desc.ClientStreams && desc.ServerStreams {
return ServerStream
}
return BidiStream
}
// monitoredClientStream wraps grpc.ClientStream allowing each Sent/Recv of message to increment counters.
type monitoredClientStream struct {
grpc.ClientStream
monitor *clientReporter
}
func (s *monitoredClientStream) SendMsg(m interface{}) error {
timer := s.monitor.SendMessageTimer()
err := s.ClientStream.SendMsg(m)
timer.ObserveDuration()
if err == nil {
s.monitor.SentMessage()
}
return err
}
func (s *monitoredClientStream) RecvMsg(m interface{}) error {
timer := s.monitor.ReceiveMessageTimer()
err := s.ClientStream.RecvMsg(m)
timer.ObserveDuration()
if err == nil {
s.monitor.ReceivedMessage()
} else if err == io.EOF {
s.monitor.Handled(codes.OK)
} else {
st, _ := status.FromError(err)
s.monitor.Handled(st.Code())
}
return err
}