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annotate rust/chg/src/message.rs @ 43818:ce088b38f92b

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rust: run rustfmt # skip-blame automated reformatting Differential Revision: https://phab.mercurial-scm.org/D7578
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 07 Dec 2019 13:06:25 -0800
parents b1d8acd82d60
children 8a7beeea655f
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1 // Copyright 2018 Yuya Nishihara <yuya@tcha.org>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5
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6 //! Utility for parsing and building command-server messages.
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7
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8 use bytes::Bytes;
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9 use std::error;
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10 use std::ffi::{OsStr, OsString};
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11 use std::io;
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12 use std::os::unix::ffi::OsStrExt;
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13
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14 pub use tokio_hglib::message::*; // re-exports
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15
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16 /// Shell command type requested by the server.
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17 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
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18 pub enum CommandType {
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19 /// Pager should be spawned.
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20 Pager,
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21 /// Shell command should be executed to send back the result code.
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22 System,
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23 }
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24
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25 /// Shell command requested by the server.
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26 #[derive(Clone, Debug, Eq, PartialEq)]
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27 pub struct CommandSpec {
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28 pub command: OsString,
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29 pub current_dir: OsString,
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30 pub envs: Vec<(OsString, OsString)>,
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31 }
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32
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33 /// Parses "S" channel request into command type and spec.
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34 pub fn parse_command_spec(data: Bytes) -> io::Result<(CommandType, CommandSpec)> {
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35 let mut split = data.split(|&c| c == b'\0');
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36 let ctype = parse_command_type(split.next().ok_or(new_parse_error("missing type"))?)?;
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37 let command = split.next().ok_or(new_parse_error("missing command"))?;
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38 let current_dir = split.next().ok_or(new_parse_error("missing current dir"))?;
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39
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40 let mut envs = Vec::new();
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41 for l in split {
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42 let mut s = l.splitn(2, |&c| c == b'=');
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43 let k = s.next().unwrap();
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44 let v = s.next().ok_or(new_parse_error("malformed env"))?;
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45 envs.push((
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46 OsStr::from_bytes(k).to_owned(),
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47 OsStr::from_bytes(v).to_owned(),
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48 ));
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49 }
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50
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51 let spec = CommandSpec {
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52 command: OsStr::from_bytes(command).to_owned(),
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53 current_dir: OsStr::from_bytes(current_dir).to_owned(),
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54 envs: envs,
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55 };
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56 Ok((ctype, spec))
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57 }
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58
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59 fn parse_command_type(value: &[u8]) -> io::Result<CommandType> {
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60 match value {
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61 b"pager" => Ok(CommandType::Pager),
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62 b"system" => Ok(CommandType::System),
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63 _ => Err(new_parse_error(format!(
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64 "unknown command type: {}",
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65 decode_latin1(value)
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66 ))),
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67 }
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68 }
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69
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70 fn decode_latin1<S>(s: S) -> String
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71 where
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72 S: AsRef<[u8]>,
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73 {
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74 s.as_ref().iter().map(|&c| c as char).collect()
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75 }
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76
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77 fn new_parse_error<E>(error: E) -> io::Error
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78 where
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79 E: Into<Box<error::Error + Send + Sync>>,
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80 {
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81 io::Error::new(io::ErrorKind::InvalidData, error)
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82 }
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83
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84 #[cfg(test)]
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85 mod tests {
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86 use super::*;
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87 use std::os::unix::ffi::OsStringExt;
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88
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89 #[test]
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90 fn parse_command_spec_good() {
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91 let src = [
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92 b"pager".as_ref(),
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93 b"less -FRX".as_ref(),
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94 b"/tmp".as_ref(),
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95 b"LANG=C".as_ref(),
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96 b"HGPLAIN=".as_ref(),
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97 ]
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98 .join(&0);
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99 let spec = CommandSpec {
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100 command: os_string_from(b"less -FRX"),
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101 current_dir: os_string_from(b"/tmp"),
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102 envs: vec![
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103 (os_string_from(b"LANG"), os_string_from(b"C")),
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104 (os_string_from(b"HGPLAIN"), os_string_from(b"")),
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105 ],
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106 };
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107 assert_eq!(
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108 parse_command_spec(Bytes::from(src)).unwrap(),
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109 (CommandType::Pager, spec)
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110 );
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111 }
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112
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113 #[test]
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114 fn parse_command_spec_too_short() {
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115 assert!(parse_command_spec(Bytes::from_static(b"")).is_err());
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116 assert!(parse_command_spec(Bytes::from_static(b"pager")).is_err());
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117 assert!(parse_command_spec(Bytes::from_static(b"pager\0less")).is_err());
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118 }
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119
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120 #[test]
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121 fn parse_command_spec_malformed_env() {
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122 assert!(parse_command_spec(Bytes::from_static(b"pager\0less\0/tmp\0HOME")).is_err());
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123 }
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124
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125 #[test]
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126 fn parse_command_spec_unknown_type() {
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127 assert!(parse_command_spec(Bytes::from_static(b"paper\0less")).is_err());
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128 }
b1d8acd82d60 rust-chg: add parser for request messages sent to "S" channel
Yuya Nishihara <yuya@tcha.org>
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129
b1d8acd82d60 rust-chg: add parser for request messages sent to "S" channel
Yuya Nishihara <yuya@tcha.org>
parents:
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130 fn os_string_from(s: &[u8]) -> OsString {
b1d8acd82d60 rust-chg: add parser for request messages sent to "S" channel
Yuya Nishihara <yuya@tcha.org>
parents:
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131 OsString::from_vec(s.to_vec())
b1d8acd82d60 rust-chg: add parser for request messages sent to "S" channel
Yuya Nishihara <yuya@tcha.org>
parents:
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132 }
b1d8acd82d60 rust-chg: add parser for request messages sent to "S" channel
Yuya Nishihara <yuya@tcha.org>
parents:
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133 }