github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/engine/pkg/cmd/cli/cli.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 cli
    15  
    16  import (
    17  	"fmt"
    18  	"io"
    19  	"os"
    20  
    21  	"github.com/chzyer/readline"
    22  	"github.com/mattn/go-shellwords"
    23  	"github.com/pingcap/tiflow/engine/pkg/cmd/util"
    24  	ticdcutil "github.com/pingcap/tiflow/pkg/cmd/util"
    25  	"github.com/spf13/cobra"
    26  )
    27  
    28  // options defines flags for the `cli` command.
    29  type options struct {
    30  	interact bool
    31  }
    32  
    33  // newOptions creates new options for the `cli` command.
    34  func newOptions() *options {
    35  	return &options{}
    36  }
    37  
    38  // addFlags receives a *cobra.Command reference and binds
    39  // flags related to template printing to it.
    40  func (o *options) addFlags(c *cobra.Command) {
    41  	if o == nil {
    42  		return
    43  	}
    44  	c.PersistentFlags().BoolVarP(&o.interact, "interact", "i", false, "Run cdc cli with readline")
    45  }
    46  
    47  // NewCmdCli creates the `cli` command.
    48  func NewCmdCli() *cobra.Command {
    49  	o := newOptions()
    50  
    51  	cmds := &cobra.Command{
    52  		Use:   "cli",
    53  		Short: "Manage jobs and dataflow engine cluster",
    54  		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
    55  			// Initialize signal handler set the current default context.
    56  			util.InitCmd(cmd)
    57  			ticdcutil.LogHTTPProxies()
    58  			return nil
    59  		},
    60  		Args: cobra.NoArgs,
    61  		RunE: func(cmd *cobra.Command, args []string) error {
    62  			// Whether to run interactively or not.
    63  			if o.interact {
    64  				run()
    65  				return nil
    66  			}
    67  			return cmd.Help()
    68  		},
    69  	}
    70  
    71  	// Binding the `cli` command flags.
    72  	o.addFlags(cmds)
    73  
    74  	// Add subcommands.
    75  	cmds.AddCommand(newCmdJob())
    76  
    77  	return cmds
    78  }
    79  
    80  func run() {
    81  	l, err := readline.NewEx(&readline.Config{
    82  		Prompt:            "\033[31m»\033[0m ",
    83  		HistoryFile:       "/tmp/readline.tmp",
    84  		InterruptPrompt:   "^C",
    85  		EOFPrompt:         "^D",
    86  		HistorySearchFold: true,
    87  	})
    88  	if err != nil {
    89  		panic(err)
    90  	}
    91  	defer l.Close()
    92  
    93  	for {
    94  		line, err := l.Readline()
    95  		if err != nil {
    96  			if err == readline.ErrInterrupt {
    97  				break
    98  			} else if err == io.EOF {
    99  				break
   100  			}
   101  			continue
   102  		}
   103  		if line == "exit" {
   104  			os.Exit(0)
   105  		}
   106  		args, err := shellwords.Parse(line)
   107  		if err != nil {
   108  			fmt.Printf("parse command err: %v\n", err)
   109  			continue
   110  		}
   111  
   112  		command := NewCmdCli()
   113  		command.SetArgs(args)
   114  		_ = command.ParseFlags(args)
   115  		command.SetOut(os.Stdout)
   116  		command.SetErr(os.Stdout)
   117  		if err = command.Execute(); err != nil {
   118  			command.Println(err)
   119  		}
   120  	}
   121  }