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| </pre><pre class="rust"><code><span class="kw">use </span>std::io::Write; |
| <span class="kw">use </span>std::marker::{Send, Sync}; |
| <span class="kw">use </span>std::path::{Path, PathBuf}; |
| <span class="kw">use </span>std::sync::Arc; |
| <span class="kw">use </span>std::time::Duration; |
| <span class="kw">use </span>std::{fmt, io, thread}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::directory::directory_lock::Lock; |
| <span class="kw">use </span><span class="kw">crate</span>::directory::error::{DeleteError, LockError, OpenReadError, OpenWriteError}; |
| <span class="kw">use </span><span class="kw">crate</span>::directory::{FileHandle, FileSlice, WatchCallback, WatchHandle, WritePtr}; |
| |
| <span class="doccomment">/// Retry the logic of acquiring locks is pretty simple. |
| /// We just retry `n` times after a given `duratio`, both |
| /// depending on the type of lock. |
| </span><span class="kw">struct </span>RetryPolicy { |
| num_retries: usize, |
| wait_in_ms: u64, |
| } |
| |
| <span class="kw">impl </span>RetryPolicy { |
| <span class="kw">fn </span>no_retry() -> RetryPolicy { |
| RetryPolicy { |
| num_retries: <span class="number">0</span>, |
| wait_in_ms: <span class="number">0</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>wait_and_retry(<span class="kw-2">&mut </span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.num_retries == <span class="number">0 </span>{ |
| <span class="bool-val">false |
| </span>} <span class="kw">else </span>{ |
| <span class="self">self</span>.num_retries -= <span class="number">1</span>; |
| <span class="kw">let </span>wait_duration = Duration::from_millis(<span class="self">self</span>.wait_in_ms); |
| thread::sleep(wait_duration); |
| <span class="bool-val">true |
| </span>} |
| } |
| } |
| |
| <span class="doccomment">/// The `DirectoryLock` is an object that represents a file lock. |
| /// |
| /// It is associated with a lock file, that gets deleted on `Drop.` |
| </span><span class="kw">pub struct </span>DirectoryLock(Box<<span class="kw">dyn </span>Send + Sync + <span class="lifetime">'static</span>>); |
| |
| <span class="kw">struct </span>DirectoryLockGuard { |
| directory: Box<<span class="kw">dyn </span>Directory>, |
| path: PathBuf, |
| } |
| |
| <span class="kw">impl</span><T: Send + Sync + <span class="lifetime">'static</span>> From<Box<T>> <span class="kw">for </span>DirectoryLock { |
| <span class="kw">fn </span>from(underlying: Box<T>) -> <span class="self">Self </span>{ |
| DirectoryLock(underlying) |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>DirectoryLockGuard { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = <span class="self">self</span>.directory.delete(<span class="kw-2">&</span><span class="self">self</span>.path) { |
| <span class="macro">error!</span>(<span class="string">"Failed to remove the lock file. {:?}"</span>, e); |
| } |
| } |
| } |
| |
| <span class="kw">enum </span>TryAcquireLockError { |
| FileExists, |
| IoError(Arc<io::Error>), |
| } |
| <span class="kw">impl </span>From<io::Error> <span class="kw">for </span>TryAcquireLockError { |
| <span class="kw">fn </span>from(io_error: io::Error) -> <span class="self">Self </span>{ |
| <span class="self">Self</span>::IoError(Arc::new(io_error)) |
| } |
| } |
| |
| <span class="kw">fn </span>try_acquire_lock( |
| filepath: <span class="kw-2">&</span>Path, |
| directory: <span class="kw-2">&mut </span><span class="kw">dyn </span>Directory, |
| ) -> <span class="prelude-ty">Result</span><DirectoryLock, TryAcquireLockError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>write = directory.open_write(filepath).map_err(|e| <span class="kw">match </span>e { |
| OpenWriteError::FileAlreadyExists(<span class="kw">_</span>) => TryAcquireLockError::FileExists, |
| OpenWriteError::IoError { io_error, .. } => TryAcquireLockError::IoError(io_error), |
| })<span class="question-mark">?</span>; |
| write.flush().map_err(TryAcquireLockError::from)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(DirectoryLock::from(Box::new(DirectoryLockGuard { |
| directory: directory.box_clone(), |
| path: filepath.to_owned(), |
| }))) |
| } |
| |
| <span class="kw">fn </span>retry_policy(is_blocking: bool) -> RetryPolicy { |
| <span class="kw">if </span>is_blocking { |
| RetryPolicy { |
| num_retries: <span class="number">100</span>, |
| wait_in_ms: <span class="number">100</span>, |
| } |
| } <span class="kw">else </span>{ |
| RetryPolicy::no_retry() |
| } |
| } |
| |
| <span class="doccomment">/// Write-once read many (WORM) abstraction for where |
| /// tantivy's data should be stored. |
| /// |
| /// There are currently two implementations of `Directory` |
| /// |
| /// - The [`MMapDirectory`][crate::directory::MmapDirectory], this |
| /// should be your default choice. |
| /// - The [`RamDirectory`][crate::directory::RamDirectory], which |
| /// should be used mostly for tests. |
| </span><span class="kw">pub trait </span>Directory: DirectoryClone + fmt::Debug + Send + Sync + <span class="lifetime">'static </span>{ |
| <span class="doccomment">/// Opens a file and returns a boxed `FileHandle`. |
| /// |
| /// Users of `Directory` should typically call `Directory::open_read(...)`, |
| /// while `Directory` implementor should implement `get_file_handle()`. |
| </span><span class="kw">fn </span>get_file_handle(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Arc<<span class="kw">dyn </span>FileHandle>, OpenReadError>; |
| |
| <span class="doccomment">/// Once a virtual file is open, its data may not |
| /// change. |
| /// |
| /// Specifically, subsequent writes or flushes should |
| /// have no effect on the returned [`FileSlice`] object. |
| /// |
| /// You should only use this to read files create with [`Directory::open_write()`]. |
| </span><span class="kw">fn </span>open_read(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><FileSlice, OpenReadError> { |
| <span class="kw">let </span>file_handle = <span class="self">self</span>.get_file_handle(path)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(FileSlice::new(file_handle)) |
| } |
| |
| <span class="doccomment">/// Removes a file |
| /// |
| /// Removing a file will not affect an eventual |
| /// existing [`FileSlice`] pointing to it. |
| /// |
| /// Removing a nonexistent file, returns a |
| /// [`DeleteError::FileDoesNotExist`]. |
| </span><span class="kw">fn </span>delete(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><(), DeleteError>; |
| |
| <span class="doccomment">/// Returns true if and only if the file exists |
| </span><span class="kw">fn </span>exists(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><bool, OpenReadError>; |
| |
| <span class="doccomment">/// Opens a writer for the *virtual file* associated with |
| /// a [`Path`]. |
| /// |
| /// Right after this call, for the span of the execution of the program |
| /// the file should be created and any subsequent call to |
| /// [`Directory::open_read()`] for the same path should return |
| /// a [`FileSlice`]. |
| /// |
| /// However, depending on the directory implementation, |
| /// it might be required to call [`Directory::sync_directory()`] to ensure |
| /// that the file is durably created. |
| /// (The semantics here are the same when dealing with |
| /// a POSIX filesystem.) |
| /// |
| /// Write operations may be aggressively buffered. |
| /// The client of this trait is responsible for calling flush |
| /// to ensure that subsequent `read` operations |
| /// will take into account preceding `write` operations. |
| /// |
| /// Flush operation should also be persistent. |
| /// |
| /// The user shall not rely on [`Drop`] triggering `flush`. |
| /// Note that [`RamDirectory`][crate::directory::RamDirectory] will |
| /// panic! if `flush` was not called. |
| /// |
| /// The file may not previously exist. |
| </span><span class="kw">fn </span>open_write(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><WritePtr, OpenWriteError>; |
| |
| <span class="doccomment">/// Reads the full content file that has been written using |
| /// [`Directory::atomic_write()`]. |
| /// |
| /// This should only be used for small files. |
| /// |
| /// You should only use this to read files create with [`Directory::atomic_write()`]. |
| </span><span class="kw">fn </span>atomic_read(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path) -> <span class="prelude-ty">Result</span><Vec<u8>, OpenReadError>; |
| |
| <span class="doccomment">/// Atomically replace the content of a file with data. |
| /// |
| /// This calls ensure that reads can never *observe* |
| /// a partially written file. |
| /// |
| /// The file may or may not previously exist. |
| </span><span class="kw">fn </span>atomic_write(<span class="kw-2">&</span><span class="self">self</span>, path: <span class="kw-2">&</span>Path, data: <span class="kw-2">&</span>[u8]) -> io::Result<()>; |
| |
| <span class="doccomment">/// Sync the directory. |
| /// |
| /// This call is required to ensure that newly created files are |
| /// effectively stored durably. |
| </span><span class="kw">fn </span>sync_directory(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<()>; |
| |
| <span class="doccomment">/// Acquire a lock in the directory given in the [`Lock`]. |
| /// |
| /// The method is blocking or not depending on the [`Lock`] object. |
| </span><span class="kw">fn </span>acquire_lock(<span class="kw-2">&</span><span class="self">self</span>, lock: <span class="kw-2">&</span>Lock) -> <span class="prelude-ty">Result</span><DirectoryLock, LockError> { |
| <span class="kw">let </span><span class="kw-2">mut </span>box_directory = <span class="self">self</span>.box_clone(); |
| <span class="kw">let </span><span class="kw-2">mut </span>retry_policy = retry_policy(lock.is_blocking); |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>try_acquire_lock(<span class="kw-2">&</span>lock.filepath, <span class="kw-2">&mut *</span>box_directory) { |
| <span class="prelude-val">Ok</span>(result) => { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(result); |
| } |
| <span class="prelude-val">Err</span>(TryAcquireLockError::FileExists) => { |
| <span class="kw">if </span>!retry_policy.wait_and_retry() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(LockError::LockBusy); |
| } |
| } |
| <span class="prelude-val">Err</span>(TryAcquireLockError::IoError(io_error)) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(LockError::IoError(io_error)); |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Registers a callback that will be called whenever a change on the `meta.json` |
| /// using the [`Directory::atomic_write()`] API is detected. |
| /// |
| /// The behavior when using `.watch()` on a file using [`Directory::open_write()`] is, on the |
| /// other hand, undefined. |
| /// |
| /// The file will be watched for the lifetime of the returned `WatchHandle`. The caller is |
| /// required to keep it. |
| /// It does not override previous callbacks. When the file is modified, all callback that are |
| /// registered (and whose [`WatchHandle`] is still alive) are triggered. |
| /// |
| /// Internally, tantivy only uses this API to detect new commits to implement the |
| /// `OnCommit` `ReloadPolicy`. Not implementing watch in a `Directory` only prevents the |
| /// `OnCommit` `ReloadPolicy` to work properly. |
| </span><span class="kw">fn </span>watch(<span class="kw-2">&</span><span class="self">self</span>, watch_callback: WatchCallback) -> <span class="kw">crate</span>::Result<WatchHandle>; |
| } |
| |
| <span class="doccomment">/// DirectoryClone |
| </span><span class="kw">pub trait </span>DirectoryClone { |
| <span class="doccomment">/// Clones the directory and boxes the clone |
| </span><span class="kw">fn </span>box_clone(<span class="kw-2">&</span><span class="self">self</span>) -> Box<<span class="kw">dyn </span>Directory>; |
| } |
| |
| <span class="kw">impl</span><T> DirectoryClone <span class="kw">for </span>T |
| <span class="kw">where </span>T: <span class="lifetime">'static </span>+ Directory + Clone |
| { |
| <span class="kw">fn </span>box_clone(<span class="kw-2">&</span><span class="self">self</span>) -> Box<<span class="kw">dyn </span>Directory> { |
| Box::new(<span class="self">self</span>.clone()) |
| } |
| } |
| |
| <span class="kw">impl </span>Clone <span class="kw">for </span>Box<<span class="kw">dyn </span>Directory> { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">self</span>.box_clone() |
| } |
| } |
| |
| <span class="kw">impl</span><T: Directory + <span class="lifetime">'static</span>> From<T> <span class="kw">for </span>Box<<span class="kw">dyn </span>Directory> { |
| <span class="kw">fn </span>from(t: T) -> <span class="self">Self </span>{ |
| Box::new(t) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
