mirror of https://github.com/grpc/grpc-go.git
98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
/*
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*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// Binary server demonstrates how to use ORCA for reporting out-of-band
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// and per-RPC load metrics.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"net"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/internal"
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"google.golang.org/grpc/orca"
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"google.golang.org/grpc/status"
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pb "google.golang.org/grpc/examples/features/proto/echo"
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)
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var port = flag.Int("port", 50051, "the port to serve on")
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type server struct {
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pb.UnimplementedEchoServer
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}
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func (s *server) UnaryEcho(ctx context.Context, in *pb.EchoRequest) (*pb.EchoResponse, error) {
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// Report a sample cost for this query.
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cmr := orca.CallMetricsRecorderFromContext(ctx)
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if cmr == nil {
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return nil, status.Errorf(codes.Internal, "unable to retrieve call metrics recorder (missing ORCA ServerOption?)")
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}
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cmr.SetRequestCost("db_queries", 10)
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return &pb.EchoResponse{Message: in.Message}, nil
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}
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func main() {
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flag.Parse()
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lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))
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if err != nil {
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log.Fatalf("Failed to listen: %v", err)
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}
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fmt.Printf("Server listening at %v\n", lis.Addr())
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// Create the gRPC server with the orca.CallMetricsServerOption() option,
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// which will enable per-call metric recording. No ServerMetricsProvider
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// is given here because the out-of-band reporting is enabled separately.
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s := grpc.NewServer(orca.CallMetricsServerOption(nil))
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pb.RegisterEchoServer(s, &server{})
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// Register the orca service for out-of-band metric reporting, and set the
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// minimum reporting interval to 3 seconds. Note that, by default, the
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// minimum interval must be at least 30 seconds, but 3 seconds is set via
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// an internal-only option for illustration purposes only.
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smr := orca.NewServerMetricsRecorder()
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opts := orca.ServiceOptions{
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MinReportingInterval: 3 * time.Second,
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ServerMetricsProvider: smr,
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}
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internal.ORCAAllowAnyMinReportingInterval.(func(so *orca.ServiceOptions))(&opts)
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if err := orca.Register(s, opts); err != nil {
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log.Fatalf("Failed to register ORCA service: %v", err)
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}
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// Simulate CPU utilization reporting.
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go func() {
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for {
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smr.SetCPUUtilization(.5)
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time.Sleep(2 * time.Second)
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smr.SetCPUUtilization(.9)
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time.Sleep(2 * time.Second)
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}
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}()
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s.Serve(lis)
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}
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