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annotate rust/hg-core/src/logging.rs @ 49175:34decbaf4da3

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node: manually implement Debug I got too irritated today with the default Debug implementation of hg::revlog::Node while playing with a new parser. This isn't quite what I wanted, but it wasn't much code and it at least gives you output that's easy to visually compare to a node.hex()ed identifier from the Python side of things. Sadly, this doesn't influence the output in lldb or the VSCode debugger extension that uses lldb under the covers, but it at least means debug prints are a little more useful. Differential Revision: https://phab.mercurial-scm.org/D12608
author Augie Fackler <augie@google.com>
date Thu, 05 May 2022 14:47:26 -0400
parents 9cd35c8c6044
children db7dbe6f7bb2
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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 }