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/*
*
* Copyright 2019 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.
*
*/
package main
import (
"context"
"encoding/gob"
"fmt"
"os"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
ppb "google.golang.org/grpc/profiling/proto"
)
func setEnabled(ctx context.Context, c ppb.ProfilingClient, enabled bool) error {
_, err := c.Enable(ctx, &ppb.EnableRequest{Enabled: enabled})
if err != nil {
logger.Infof("error calling Enable: %v\n", err)
return err
}
logger.Infof("successfully set enabled = %v", enabled)
return nil
}
func retrieveSnapshot(ctx context.Context, c ppb.ProfilingClient, f string) error {
logger.Infof("getting stream stats")
resp, err := c.GetStreamStats(ctx, &ppb.GetStreamStatsRequest{})
if err != nil {
logger.Errorf("error calling GetStreamStats: %v\n", err)
return err
}
s := &snapshot{StreamStats: resp.StreamStats}
logger.Infof("creating snapshot file %s", f)
file, err := os.Create(f)
if err != nil {
logger.Errorf("cannot create %s: %v", f, err)
return err
}
defer file.Close()
logger.Infof("encoding data and writing to snapshot file %s", f)
encoder := gob.NewEncoder(file)
err = encoder.Encode(s)
if err != nil {
logger.Infof("error encoding: %v", err)
return err
}
logger.Infof("successfully wrote profiling snapshot to %s", f)
return nil
}
func remoteCommand() error {
ctx := context.Background()
if *flagTimeout > 0 {
var cancel func()
ctx, cancel = context.WithTimeout(context.Background(), time.Duration(*flagTimeout)*time.Second)
defer cancel()
}
logger.Infof("dialing %s", *flagAddress)
cc, err := grpc.Dial(*flagAddress, grpc.WithTransportCredentials(insecure.NewCredentials()))
if err != nil {
logger.Errorf("cannot dial %s: %v", *flagAddress, err)
return err
}
defer cc.Close()
c := ppb.NewProfilingClient(cc)
if *flagEnableProfiling || *flagDisableProfiling {
return setEnabled(ctx, c, *flagEnableProfiling)
} else if *flagRetrieveSnapshot {
return retrieveSnapshot(ctx, c, *flagSnapshot)
} else {
return fmt.Errorf("what should I do with the remote target?")
}
}
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