f9212348e4
This provideds generic grpc metrics via prometheus Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
75 lines
2.3 KiB
Go
75 lines
2.3 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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"golang.org/x/net/context"
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"google.golang.org/grpc"
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)
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// PreregisterServices takes a gRPC server and pre-initializes all counters to 0.
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// This allows for easier monitoring in Prometheus (no missing metrics), and should be called *after* all services have
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// been registered with the server.
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func Register(server *grpc.Server) {
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serviceInfo := server.GetServiceInfo()
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for serviceName, info := range serviceInfo {
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for _, mInfo := range info.Methods {
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preRegisterMethod(serviceName, &mInfo)
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}
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}
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}
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// UnaryServerInterceptor is a gRPC server-side interceptor that provides Prometheus monitoring for Unary RPCs.
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func UnaryServerInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
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monitor := newServerReporter(Unary, info.FullMethod)
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monitor.ReceivedMessage()
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resp, err := handler(ctx, req)
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monitor.Handled(grpc.Code(err))
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if err == nil {
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monitor.SentMessage()
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}
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return resp, err
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}
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// StreamServerInterceptor is a gRPC server-side interceptor that provides Prometheus monitoring for Streaming RPCs.
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func StreamServerInterceptor(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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monitor := newServerReporter(streamRpcType(info), info.FullMethod)
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err := handler(srv, &monitoredServerStream{ss, monitor})
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monitor.Handled(grpc.Code(err))
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return err
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}
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func streamRpcType(info *grpc.StreamServerInfo) grpcType {
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if info.IsClientStream && !info.IsServerStream {
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return ClientStream
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} else if !info.IsClientStream && info.IsServerStream {
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return ServerStream
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}
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return BidiStream
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}
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// monitoredStream wraps grpc.ServerStream allowing each Sent/Recv of message to increment counters.
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type monitoredServerStream struct {
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grpc.ServerStream
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monitor *serverReporter
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}
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func (s *monitoredServerStream) SendMsg(m interface{}) error {
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err := s.ServerStream.SendMsg(m)
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if err == nil {
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s.monitor.SentMessage()
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}
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return err
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}
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func (s *monitoredServerStream) RecvMsg(m interface{}) error {
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err := s.ServerStream.RecvMsg(m)
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if err == nil {
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s.monitor.ReceivedMessage()
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}
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return err
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}
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