local.go

Documentation: google.golang.org/grpc/profiling/cmd

     1  /*
     2   *
     3   * Copyright 2019 gRPC authors.
     4   *
     5   * Licensed under the Apache License, Version 2.0 (the "License");
     6   * you may not use this file except in compliance with the License.
     7   * You may obtain a copy of the License at
     8   *
     9   *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   *
    17   */
    18  
    19  package main
    20  
    21  import (
    22  	"encoding/gob"
    23  	"fmt"
    24  	"os"
    25  )
    26  
    27  func loadSnapshot(snapshotFileName string) (*snapshot, error) {
    28  	logger.Infof("opening snapshot file %s", snapshotFileName)
    29  	snapshotFile, err := os.Open(snapshotFileName)
    30  	if err != nil {
    31  		logger.Errorf("cannot open %s: %v", snapshotFileName, err)
    32  		return nil, err
    33  	}
    34  	defer snapshotFile.Close()
    35  
    36  	logger.Infof("decoding snapshot file %s", snapshotFileName)
    37  	s := &snapshot{}
    38  	decoder := gob.NewDecoder(snapshotFile)
    39  	if err = decoder.Decode(s); err != nil {
    40  		logger.Errorf("cannot decode %s: %v", snapshotFileName, err)
    41  		return nil, err
    42  	}
    43  
    44  	return s, nil
    45  }
    46  
    47  func localCommand() error {
    48  	if *flagSnapshot == "" {
    49  		return fmt.Errorf("-snapshot flag missing")
    50  	}
    51  
    52  	s, err := loadSnapshot(*flagSnapshot)
    53  	if err != nil {
    54  		return err
    55  	}
    56  
    57  	if *flagStreamStatsCatapultJSON == "" {
    58  		return fmt.Errorf("snapshot file specified without an action to perform")
    59  	}
    60  
    61  	if *flagStreamStatsCatapultJSON != "" {
    62  		if err = streamStatsCatapultJSON(s, *flagStreamStatsCatapultJSON); err != nil {
    63  			return err
    64  		}
    65  	}
    66  
    67  	return nil
    68  }
    69
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