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