mercurial-scm/hg: rust/hg-core/src/revlog/file

annotate rust/hg-core/src/revlog/file_io.rs @ 52178:bd8081e9fd62

rust: don't star export from the `revlog` module This made a lot of the imports confusing because they didn't make sense at the top level (so, outside of `revlog`), and they hide the more common types when autocompleting.

author	Rapha?l Gom?s <rgomes@octobus.net>
date	Thu, 26 Sep 2024 14:26:24 +0200
parents	7be39c5110c9
children	8d35941689af

rev	line source
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	1 //! Helpers for revlog file reading and writing.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	2
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	3 use std::{
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	4 cell::RefCell,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	5 fs::File,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	6 io::{Read, Seek, SeekFrom, Write},
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	7 path::{Path, PathBuf},
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	8 sync::{Arc, Mutex},
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	9 };
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	10
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	11 use crate::{
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	12 errors::{HgError, IoResultExt},
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	13 vfs::Vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	14 };
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	15
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	16 /// Wraps accessing arbitrary chunks of data within a file and reusing handles.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	17 /// This is currently useful for accessing a revlog's data file, only reading
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	18 /// the ranges that are currently relevant, like a sort of basic and manual
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	19 /// file-based mmap.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	20 ///
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	21 /// XXX should this just be replaced with `mmap` + `madvise` ranges?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	22 /// The upcoming `UncompressedChunkCache` will make up for most of the slowness
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	23 /// of re-reading the same chunks, so this might not be as useful. Aside from
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	24 /// the major benefit of having less code to take care of, using `mmap` will
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	25 /// allow multiple processes to share the same pages, especially for the
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	26 /// changelog and manifest, which would make a difference in server contexts.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	27 pub struct RandomAccessFile {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	28 /// The current store VFS to pass it to [`FileHandle`]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	29 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	30 /// Filename of the open file, relative to the vfs root
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	31 pub filename: PathBuf,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	32 /// The current read-only handle on the file, if any
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	33 pub reading_handle: RefCell<Option<FileHandle>>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	34 /// The current read-write handle on the file, if any
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	35 pub writing_handle: RefCell<Option<FileHandle>>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	36 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	37
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	38 impl RandomAccessFile {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	39 /// Wrap a file for random access
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	40 pub fn new(vfs: Box<dyn Vfs>, filename: PathBuf) -> Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	41 assert!(filename.is_relative());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	42 Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	43 vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	44 filename,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	45 reading_handle: RefCell::new(None),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	46 writing_handle: RefCell::new(None),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	47 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	48 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	49
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	50 /// Read a chunk of bytes from the file.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	51 pub fn read_chunk(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	52 &self,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	53 offset: usize,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	54 length: usize,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	55 ) -> Result<Vec<u8>, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	56 let mut handle = self.get_read_handle()?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	57 handle
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	58 .seek(SeekFrom::Start(offset as u64))
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	59 .when_reading_file(&self.filename)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	60 handle.read_exact(length).when_reading_file(&self.filename)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	61 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	62
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	63 /// `pub` only for hg-cpython
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	64 #[doc(hidden)]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	65 pub fn get_read_handle(&self) -> Result<FileHandle, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	66 if let Some(handle) = &*self.writing_handle.borrow() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	67 // Use a file handle being actively used for writes, if available.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	68 // There is some danger to doing this because reads will seek the
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	69 // file.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	70 // However, [`Revlog::write_entry`] performs a `SeekFrom::End(0)`
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	71 // before all writes, so we should be safe.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	72 return Ok(handle.clone());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	73 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	74 if let Some(handle) = &*self.reading_handle.borrow() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	75 return Ok(handle.clone());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	76 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	77 // early returns done to work around borrowck being overzealous
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	78 // See https://github.com/rust-lang/rust/issues/103108
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	79 let new_handle = FileHandle::new(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	80 dyn_clone::clone_box(&*self.vfs),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	81 &self.filename,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	82 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	83 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	84 )?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	85 *self.reading_handle.borrow_mut() = Some(new_handle.clone());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	86 Ok(new_handle)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	87 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	88
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	89 /// `pub` only for hg-cpython
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	90 #[doc(hidden)]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	91 pub fn exit_reading_context(&self) {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	92 self.reading_handle.take();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	93 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	94
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	95 // Returns whether this file currently open
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	96 pub fn is_open(&self) -> bool {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	97 self.reading_handle.borrow().is_some()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	98 \|\| self.writing_handle.borrow().is_some()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	99 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	100 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	101
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	102 /// A buffer that holds new changelog index data that needs to be written
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	103 /// after the manifest and filelogs so that the repo is updated atomically to
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	104 /// external processes.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	105 #[derive(Clone, Debug, Default)]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	106 pub struct DelayedBuffer {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	107 // The actual in-memory bytes storing the delayed writes
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	108 pub(super) buffer: Vec<u8>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	109 /// The current offset into the virtual file composed of file + buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	110 offset: u64,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	111 /// The size of the file at the time of opening
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	112 file_size: u64,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	113 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	114
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	115 impl DelayedBuffer {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	116 /// Returns the length of the full data (on-disk + buffer length).
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	117 pub fn len(&self) -> u64 {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	118 self.buffer.len() as u64 + self.file_size
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	119 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	120
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	121 pub fn is_empty(&self) -> bool {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	122 self.len() == 0
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	123 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	124 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	125
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	126 /// Holds an open [`File`] and the related data. This can be used for reading
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	127 /// and writing. Writes can be delayed to a buffer before touching the disk,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	128 /// if relevant (in the changelog case), but reads are transparent.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	129 pub struct FileHandle {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	130 /// The actual open file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	131 pub file: File,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	132 /// The VFS with which the file was opened
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	133 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	134 /// Filename of the open file, relative to the repo root
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	135 filename: PathBuf,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	136 /// Buffer of delayed entry writes to the changelog index. This points
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	137 /// back to the buffer inside the revlog this handle refers to.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	138 delayed_buffer: Option<Arc<Mutex<DelayedBuffer>>>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	139 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	140
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	141 impl std::fmt::Debug for FileHandle {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	142 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	143 f.debug_struct("FileHandle")
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	144 .field("filename", &self.filename)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	145 .field("delayed_buffer", &self.delayed_buffer)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	146 .field("file", &self.file)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	147 .finish()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	148 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	149 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	150
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	151 impl Clone for FileHandle {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	152 fn clone(&self) -> Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	153 Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	154 vfs: dyn_clone::clone_box(&*self.vfs),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	155 filename: self.filename.clone(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	156 delayed_buffer: self.delayed_buffer.clone(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	157 // This can only fail if the OS doesn't have the file handle
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	158 // anymore, so we're not going to do anything useful anyway.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	159 file: self.file.try_clone().expect("couldn't clone file handle"),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	160 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	161 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	162 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	163
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	164 impl FileHandle {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	165 /// Get a (read or write) file handle to `filename`. Only creates the file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	166 /// if `create` is `true`.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	167 pub fn new(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	168 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	169 filename: impl AsRef<Path>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	170 create: bool,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	171 write: bool,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	172 ) -> Result<Self, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	173 let file = if create {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	174 vfs.create(filename.as_ref())?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	175 } else if write {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	176 vfs.open(filename.as_ref())?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	177 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	178 vfs.open_read(filename.as_ref())?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	179 };
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	180 Ok(Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	181 vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	182 filename: filename.as_ref().to_owned(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	183 delayed_buffer: None,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	184 file,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	185 })
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	186 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	187
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	188 /// Get a file handle to `filename`, but writes go to a [`DelayedBuffer`].
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	189 pub fn new_delayed(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	190 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	191 filename: impl AsRef<Path>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	192 create: bool,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	193 delayed_buffer: Arc<Mutex<DelayedBuffer>>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	194 ) -> Result<Self, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	195 let mut file = if create {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	196 vfs.create(filename.as_ref())?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	197 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	198 vfs.open(filename.as_ref())?
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	199 };
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	200 let size = vfs.file_size(&file)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	201 let offset = file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	202 .stream_position()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	203 .when_reading_file(filename.as_ref())?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	204
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	205 {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	206 let mut buf = delayed_buffer.lock().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	207 buf.file_size = size;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	208 buf.offset = offset;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	209 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	210
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	211 Ok(Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	212 vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	213 filename: filename.as_ref().to_owned(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	214 delayed_buffer: Some(delayed_buffer),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	215 file,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	216 })
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	217 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	218
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	219 /// Wrap an existing [`File`]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	220 pub fn from_file(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	221 file: File,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	222 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	223 filename: impl AsRef<Path>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	224 ) -> Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	225 Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	226 vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	227 filename: filename.as_ref().to_owned(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	228 delayed_buffer: None,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	229 file,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	230 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	231 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	232
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	233 /// Wrap an existing [`File`], but writes go to a [`DelayedBuffer`].
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	234 pub fn from_file_delayed(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	235 mut file: File,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	236 vfs: Box<dyn Vfs>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	237 filename: impl AsRef<Path>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	238 delayed_buffer: Arc<Mutex<DelayedBuffer>>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	239 ) -> Result<Self, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	240 let size = vfs.file_size(&file)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	241 let offset = file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	242 .stream_position()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	243 .when_reading_file(filename.as_ref())?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	244
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	245 {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	246 let mut buf = delayed_buffer.lock().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	247 buf.file_size = size;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	248 buf.offset = offset;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	249 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	250
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	251 Ok(Self {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	252 vfs,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	253 filename: filename.as_ref().to_owned(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	254 delayed_buffer: Some(delayed_buffer),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	255 file,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	256 })
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	257 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	258
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	259 /// Move the position of the handle to `pos`,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	260 /// spanning the [`DelayedBuffer`] if defined. Will return an error if
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	261 /// an invalid seek position is asked, or for any standard io error.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	262 pub fn seek(&mut self, pos: SeekFrom) -> Result<u64, std::io::Error> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	263 if let Some(delay_buf) = &self.delayed_buffer {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	264 let mut delay_buf = delay_buf.lock().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	265 // Virtual file offset spans real file and data
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	266 match pos {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	267 SeekFrom::Start(offset) => delay_buf.offset = offset,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	268 SeekFrom::End(offset) => {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	269 delay_buf.offset =
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	270 delay_buf.len().saturating_add_signed(offset)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	271 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	272 SeekFrom::Current(offset) => {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	273 delay_buf.offset =
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	274 delay_buf.offset.saturating_add_signed(offset);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	275 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	276 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	277 if delay_buf.offset < delay_buf.file_size {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	278 self.file.seek(pos)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	279 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	280 Ok(delay_buf.offset)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	281 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	282 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	283 self.file.seek(pos)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	284 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	285 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	286
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	287 /// Read exactly `length` bytes from the current position.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	288 /// Errors are the same as [`std::io::Read::read_exact`].
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	289 pub fn read_exact(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	290 &mut self,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	291 length: usize,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	292 ) -> Result<Vec<u8>, std::io::Error> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	293 if let Some(delay_buf) = self.delayed_buffer.as_mut() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	294 let mut delay_buf = delay_buf.lock().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	295 let mut buf = vec![0; length];
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	296 let offset: isize =
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	297 delay_buf.offset.try_into().expect("buffer too large");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	298 let file_size: isize =
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	299 delay_buf.file_size.try_into().expect("file too large");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	300 let span: isize = offset - file_size;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	301 let length = length.try_into().expect("too large of a length");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	302 let absolute_span: u64 =
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	303 span.unsigned_abs().try_into().expect("length too large");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	304 if span < 0 {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	305 if length <= absolute_span {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	306 // We're only in the file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	307 self.file.read_exact(&mut buf)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	308 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	309 // We're spanning file and buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	310 self.file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	311 .read_exact(&mut buf[..absolute_span as usize])?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	312 delay_buf
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	313 .buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	314 .take(length - absolute_span)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	315 .read_exact(&mut buf[absolute_span as usize..])?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	316 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	317 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	318 // We're only in the buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	319 delay_buf.buffer[absolute_span as usize..]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	320 .take(length)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	321 .read_exact(&mut buf)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	322 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	323 delay_buf.offset += length;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	324 Ok(buf.to_owned())
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	325 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	326 let mut buf = vec![0; length];
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	327 self.file.read_exact(&mut buf)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	328 Ok(buf)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	329 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	330 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	331
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	332 /// Flush the in-memory changes to disk. This does not write the
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	333 /// delayed buffer, only the pending file changes.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	334 pub fn flush(&mut self) -> Result<(), HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	335 self.file.flush().when_writing_file(&self.filename)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	336 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	337
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	338 /// Return the current position in the file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	339 pub fn position(&mut self) -> Result<u64, HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	340 self.file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	341 .stream_position()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	342 .when_reading_file(&self.filename)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	343 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	344
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	345 /// Append `data` to the file, or to the [`DelayedBuffer`], if any.
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	346 pub fn write_all(&mut self, data: &[u8]) -> Result<(), HgError> {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	347 if let Some(buf) = &mut self.delayed_buffer {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	348 let mut delayed_buffer = buf.lock().expect("propagate the panic");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	349 assert_eq!(delayed_buffer.offset, delayed_buffer.len());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	350 delayed_buffer.buffer.extend_from_slice(data);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	351 delayed_buffer.offset += data.len() as u64;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	352 Ok(())
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	353 } else {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	354 self.file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	355 .write_all(data)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	356 .when_writing_file(&self.filename)?;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	357 Ok(())
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	358 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	359 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	360 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	361
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	362 /// Write handles to a given revlog (index + maybe data)
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	363 #[derive(Debug)]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	364 pub struct WriteHandles {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	365 /// Handle to the index file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	366 pub index_handle: FileHandle,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	367 /// Handle to the data file, if the revlog is non-inline
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	368 pub data_handle: Option<FileHandle>,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	369 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	370
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	371 #[cfg(test)]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	372 mod tests {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	373 use std::io::ErrorKind;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	374
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	375 use crate::vfs::VfsImpl;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	376
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	377 use super::*;
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	378
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	379 #[test]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	380 fn test_random_access_file() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	381 let base = tempfile::tempdir().unwrap().into_path();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	382 let filename = Path::new("a");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	383 let file_path = base.join(filename);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	384 let raf = RandomAccessFile::new(
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	385 Box::new(VfsImpl::new(base.clone(), true)),
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	386 filename.to_owned(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	387 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	388
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	389 assert!(!raf.is_open());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	390 assert_eq!(&raf.filename, &filename);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	391 // Should fail to read a non-existing file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	392 match raf.get_read_handle().unwrap_err() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	393 HgError::IoError { error, .. } => match error.kind() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	394 std::io::ErrorKind::NotFound => {}
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	395 _ => panic!("should be not found"),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	396 },
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	397 e => panic!("{}", e.to_string()),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	398 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	399
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	400 std::fs::write(file_path, b"1234567890").unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	401
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	402 // Should be able to open an existing file
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	403 let mut handle = raf.get_read_handle().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	404 assert!(raf.is_open());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	405 assert_eq!(handle.read_exact(10).unwrap(), b"1234567890".to_vec());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	406 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	407
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	408 #[test]
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	409 fn test_file_handle() {
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	410 let base = tempfile::tempdir().unwrap().into_path();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	411 let filename = base.join("a");
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	412 // No `create` should fail
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	413 FileHandle::new(
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	414 Box::new(VfsImpl::new(base.clone(), false)),
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	415 &filename,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	416 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	417 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	418 )
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	419 .unwrap_err();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	420 std::fs::write(&filename, b"1234567890").unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	421
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	422 let mut read_handle = FileHandle::new(
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	423 Box::new(VfsImpl::new(base.clone(), true)),
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	424 &filename,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	425 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	426 false,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	427 )
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	428 .unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	429 assert_eq!(&read_handle.filename, &filename);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	430 assert_eq!(read_handle.position().unwrap(), 0);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	431
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	432 // Writing to an explicit read handle should fail
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	433 read_handle.write_all(b"some data").unwrap_err();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	434
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	435 // reading exactly n bytes should work
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	436 assert_eq!(read_handle.read_exact(3).unwrap(), b"123".to_vec());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	437 // and the position should be remembered
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	438 assert_eq!(read_handle.read_exact(2).unwrap(), b"45".to_vec());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	439
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	440 // Seeking should work
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	441 let position = read_handle.position().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	442 read_handle.seek(SeekFrom::Current(-2)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	443 assert_eq!(position - 2, read_handle.position().unwrap());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	444
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	445 // Seeking too much data should fail
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	446 read_handle.read_exact(1000).unwrap_err();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	447
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	448 // Open a write handle
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	449 let mut handle = FileHandle::new(
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	450 Box::new(VfsImpl::new(base.clone(), false)),
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	451 &filename,
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	452 false,
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	453 true,
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	454 )
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	455 .unwrap();
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	456
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	457 // Now writing should succeed
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	458 handle.write_all(b"new data").unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	459 // Opening or writing does not seek, so we should be at the start
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	460 assert_eq!(handle.position().unwrap(), 8);
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	461 // We can still read
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	462 assert_eq!(handle.read_exact(2).unwrap(), b"90".to_vec());
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	463
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	464 let mut read_handle = FileHandle::new(
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	465 Box::new(VfsImpl::new(base.clone(), true)),
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	466 &filename,
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	467 false,
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	468 false,
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	469 )
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	470 .unwrap();
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	471 read_handle.seek(SeekFrom::Start(0)).unwrap();
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	472 // On-disk file contents should be changed
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	473 assert_eq!(
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	474 &read_handle.read_exact(10).unwrap(),
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	475 &b"new data90".to_vec(),
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	476 );
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	477 // Flushing doesn't do anything unexpected
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	478 handle.flush().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	479
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	480 let delayed_buffer = Arc::new(Mutex::new(DelayedBuffer::default()));
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	481 let mut handle = FileHandle::new_delayed(
7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	482 Box::new(VfsImpl::new(base.clone(), false)),
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	483 &filename,
52167 7be39c5110c9 hg-core: add a complete VFS Rapha?l Gom?s <rgomes@octobus.net> parents: 52155 diff changeset	484 false,
52155 426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	485 delayed_buffer,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	486 )
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	487 .unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	488
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	489 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	490 handle
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	491 .delayed_buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	492 .as_ref()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	493 .unwrap()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	494 .lock()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	495 .unwrap()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	496 .file_size,
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	497 10
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	498 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	499 handle.seek(SeekFrom::End(0)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	500 handle.write_all(b"should go to buffer").unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	501 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	502 handle
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	503 .delayed_buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	504 .as_ref()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	505 .unwrap()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	506 .lock()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	507 .unwrap()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	508 .len(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	509 29
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	510 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	511 read_handle.seek(SeekFrom::Start(0)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	512 // On-disk file contents should be unchanged
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	513 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	514 read_handle.read_exact(10).unwrap(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	515 b"new data90".to_vec(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	516 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	517
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	518 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	519 read_handle.read_exact(1).unwrap_err().kind(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	520 ErrorKind::UnexpectedEof
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	521 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	522
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	523 handle.flush().unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	524 // On-disk file contents should still be unchanged after a flush
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	525 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	526 read_handle.read_exact(1).unwrap_err().kind(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	527 ErrorKind::UnexpectedEof
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	528 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	529
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	530 // Read from the buffer only
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	531 handle.seek(SeekFrom::End(-1)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	532 assert_eq!(handle.read_exact(1).unwrap(), b"r".to_vec());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	533
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	534 // Read from an overlapping section of file and buffer
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	535 handle.seek(SeekFrom::Start(6)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	536 assert_eq!(
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	537 handle.read_exact(20).unwrap(),
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	538 b"ta90should go to buf".to_vec()
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	539 );
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	540
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	541 // Read from file only
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	542 handle.seek(SeekFrom::Start(0)).unwrap();
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	543 assert_eq!(handle.read_exact(8).unwrap(), b"new data".to_vec());
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	544 }
426696af24d3 rust-revlog: add file IO helpers Rapha?l Gom?s <rgomes@octobus.net> parents: diff changeset	545 }

Mercurial > public > mercurial-scm > hg

annotate rust/hg-core/src/revlog/file_io.rs @ 52178:bd8081e9fd62