1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

// Copyright (c) 2017-present, PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

//! # Raft Engine Control

use std::path::Path;

use clap::{crate_authors, crate_version, AppSettings, Parser};
use raft_engine::internals::LogQueue;
use raft_engine::{Engine, Error, Result as EngineResult};

#[derive(Debug, clap::Parser)]
#[clap(
    name = "ctl",
    author = crate_authors!(),
    version = crate_version!(),
    setting = AppSettings::DontCollapseArgsInUsage,
)]
pub struct ControlOpt {
    // sub command type
    #[clap(subcommand)]
    cmd: Option<Cmd>,
}

#[derive(Debug, Parser)]
enum Cmd {
    /// Dump log entries in data file(s).
    Dump {
        /// Path of Raft Engine directory or specific log file.
        #[clap(short, long)]
        path: String,

        #[clap(short, long, use_delimiter = true)]
        raft_groups: Vec<u64>,
    },

    /// Check data files for logical errors.
    Check {
        /// Path of Raft Engine directory.
        #[clap(short, long)]
        path: String,
    },

    /// Run Rhai script to repair data files.
    Repair {
        /// Path of Raft Engine directory.
        #[clap(short, long)]
        path: String,

        #[clap(
            short,
            long,
            possible_values = &["append", "rewrite", "all"]
        )]
        queue: String,

        /// Path of Rhai script file.
        #[clap(short, long)]
        script: String,
    },

    /// Try running `purge_expired_files` on existing data directory.
    TryPurge {
        /// Path of Raft Engine directory.
        #[clap(short, long)]
        path: String,
    },
}

fn convert_queue(queue: &str) -> Option<LogQueue> {
    match queue {
        "append" => Some(LogQueue::Append),
        "rewrite" => Some(LogQueue::Rewrite),
        "all" => None,
        _ => unreachable!(),
    }
}

impl ControlOpt {
    pub fn validate_and_execute(mut self) -> EngineResult<()> {
        if self.cmd.is_none() {
            return Err(Error::InvalidArgument("subcommand is needed".to_owned()));
        }

        match self.cmd.take().unwrap() {
            Cmd::Dump { path, raft_groups } => {
                let it = Engine::dump(Path::new(&path))?;
                for item in it {
                    if let Ok(v) = item {
                        if raft_groups.is_empty() || raft_groups.contains(&v.raft_group_id) {
                            println!("{:?}", v)
                        }
                    } else {
                        // output error message
                        println!("{:?}", item)
                    }
                }
            }
            Cmd::Repair {
                path,
                queue,
                script,
            } => {
                let script = std::fs::read_to_string(script)?;
                Engine::unsafe_repair(Path::new(&path), convert_queue(&queue), script)?;
            }
            Cmd::Check { path } => {
                let r = Engine::consistency_check(Path::new(&path))?;
                if r.is_empty() {
                    println!("All data is Ok")
                } else {
                    println!("Corrupted info are as follows:\nraft_group_id, last_intact_index\n");
                    r.iter().for_each(|(x, y)| println!("{:?}, {:?}", x, y))
                }
            }
            Cmd::TryPurge { path } => {
                let e = Engine::open(raft_engine::Config {
                    dir: path,
                    ..Default::default()
                })?;
                println!(
                    "purge_expired_files() returns {:?}",
                    e.purge_expired_files()?
                );
            }
        }
        Ok(())
    }
}

pub fn run_command(mut args: Vec<String>) {
    args.insert(0, "ctl".to_owned());
    let opts = ControlOpt::parse_from(args);
    if let Err(e) = opts.validate_and_execute() {
        println!("{:?}", e);
    }
}