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annotate rust/hg-core/src/logging.rs @ 49558:363923bd51cd stable

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dirstate-v2: hash the source of the ignore patterns as well Fixes the test introduced in the last changeset. This caused the hash to change, which means that the check in the test had to be adapted. Since this hash is only done as a caching mechanism, invalidation does not pose any backwards compatibility issues.
author Rapha?l Gom?s <rgomes@octobus.net>
date Wed, 02 Nov 2022 12:05:34 +0100
parents 9cd35c8c6044
children db7dbe6f7bb2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 use crate::errors::{HgError, HgResultExt, IoErrorContext, IoResultExt};
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2 use crate::vfs::Vfs;
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3 use std::io::Write;
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4
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5 /// An utility to append to a log file with the given name, and optionally
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6 /// rotate it after it reaches a certain maximum size.
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7 ///
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8 /// Rotation works by renaming "example.log" to "example.log.1", after renaming
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9 /// "example.log.1" to "example.log.2" etc up to the given maximum number of
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10 /// files.
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11 pub struct LogFile<'a> {
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12 vfs: Vfs<'a>,
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13 name: &'a str,
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14 max_size: Option<u64>,
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15 max_files: u32,
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16 }
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17
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18 impl<'a> LogFile<'a> {
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19 pub fn new(vfs: Vfs<'a>, name: &'a str) -> Self {
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20 Self {
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21 vfs,
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22 name,
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23 max_size: None,
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24 max_files: 0,
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25 }
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26 }
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27
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28 /// Rotate before writing to a log file that was already larger than the
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29 /// given size, in bytes. `None` disables rotation.
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30 pub fn max_size(mut self, value: Option<u64>) -> Self {
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31 self.max_size = value;
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32 self
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33 }
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34
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35 /// Keep this many rotated files `{name}.1` up to `{name}.{max}`, in
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36 /// addition to the original `{name}` file.
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37 pub fn max_files(mut self, value: u32) -> Self {
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38 self.max_files = value;
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39 self
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40 }
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41
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42 /// Append the given `bytes` as-is to the log file, after rotating if
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43 /// needed.
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44 ///
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45 /// No trailing newline is added. Make sure to include one in `bytes` if
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46 /// desired.
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47 pub fn write(&self, bytes: &[u8]) -> Result<(), HgError> {
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48 let path = self.vfs.join(self.name);
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49 let context = || IoErrorContext::WritingFile(path.clone());
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50 let open = || {
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51 std::fs::OpenOptions::new()
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52 .create(true)
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53 .append(true)
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54 .open(&path)
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55 .with_context(context)
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56 };
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57 let mut file = open()?;
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58 if let Some(max_size) = self.max_size {
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59 if file.metadata().with_context(context)?.len() >= max_size {
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60 // For example with `max_files == 5`, the first iteration of
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61 // this loop has `i == 4` and renames `{name}.4` to `{name}.5`.
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62 // The last iteration renames `{name}.1` to
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63 // `{name}.2`
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64 for i in (1..self.max_files).rev() {
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65 self.vfs
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66 .rename(
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67 format!("{}.{}", self.name, i),
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68 format!("{}.{}", self.name, i + 1),
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69 )
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70 .io_not_found_as_none()?;
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71 }
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72 // Then rename `{name}` to `{name}.1`. This is the
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73 // previously-opened `file`.
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74 self.vfs
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75 .rename(self.name, format!("{}.1", self.name))
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76 .io_not_found_as_none()?;
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77 // Finally, create a new `{name}` file and replace our `file`
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78 // handle.
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79 file = open()?;
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80 }
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81 }
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82 file.write_all(bytes).with_context(context)?;
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83 file.sync_all().with_context(context)
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84 }
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85 }
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86
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87 #[test]
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88 fn test_rotation() {
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89 let temp = tempfile::tempdir().unwrap();
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90 let vfs = Vfs { base: temp.path() };
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91 let logger = LogFile::new(vfs, "log").max_size(Some(3)).max_files(2);
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92 logger.write(b"one\n").unwrap();
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93 logger.write(b"two\n").unwrap();
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94 logger.write(b"3\n").unwrap();
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95 logger.write(b"four\n").unwrap();
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96 logger.write(b"five\n").unwrap();
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97 assert_eq!(vfs.read("log").unwrap(), b"five\n");
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98 assert_eq!(vfs.read("log.1").unwrap(), b"3\nfour\n");
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99 assert_eq!(vfs.read("log.2").unwrap(), b"two\n");
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100 assert!(vfs.read("log.3").io_not_found_as_none().unwrap().is_none());
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101 }