github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/engine/pkg/cmd/util/helper.go (about)

     1  // Copyright 2022 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package util
    15  
    16  import (
    17  	"context"
    18  	"os"
    19  	"os/signal"
    20  	"syscall"
    21  
    22  	"github.com/pingcap/log"
    23  	cmdconetxt "github.com/pingcap/tiflow/pkg/cmd/context"
    24  	"github.com/spf13/cobra"
    25  	"go.uber.org/zap"
    26  )
    27  
    28  // InitCmd initializes the default context and returns its cancel function.
    29  func InitCmd(cmd *cobra.Command) context.CancelFunc {
    30  	sc := make(chan os.Signal, 1)
    31  	signal.Notify(sc,
    32  		syscall.SIGHUP,
    33  		syscall.SIGINT,
    34  		syscall.SIGTERM,
    35  		syscall.SIGQUIT)
    36  
    37  	ctx, cancel := context.WithCancel(context.Background())
    38  	go func() {
    39  		sig := <-sc
    40  		log.Info("got signal to exit", zap.Stringer("signal", sig))
    41  		cancel()
    42  	}()
    43  
    44  	cmdconetxt.SetDefaultContext(ctx)
    45  
    46  	return cancel
    47  }