parent
f99788afa1
commit
61c78c89ee
GPG Key ID:
284488987C31F630
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//! Handle deletion
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//!
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//! # Handling paths
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//! Deletion of single files is trivial, deletion of directories is not as trivial.
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//! Other types of filesystem object are ignored.
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//!
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//! ## Directories
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//! With directories the deletion processes all files containing recursively.
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//! See `restore` for restoration of directories
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use super::*;
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use std::{
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path::{
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Path,
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PathBuf,
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},
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};
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/// Process a single file.
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///
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/// `path` is known to be a file at this point.
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async fn process_single(state: Arc<state::State>, path: &Path) -> eyre::Result<()>
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{
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let _g = state.lock().await;
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debug!("{:?} Processing", path);
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Ok(())
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}
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/// Process this path
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///
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/// This will not return until all its children finish too (if any)
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pub async fn process(state: Arc<state::State>, path: impl AsRef<Path>) -> eyre::Result<()>
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{
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let path = path.as_ref();
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if path.is_dir() {
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trace!("{:?} Spawning children", path);
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//TODO! Walk dir tree
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todo!()
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} else if path.is_file() {
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process_single(state, path).await
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.wrap_err(eyre!("Processing file failed"))
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.with_section(|| format!("{:?}", path).header("Path was"))
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} else {
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error!("{:?} is not a recognised FS object", path);
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return Err(eyre!("Unsupported FS object"))
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.with_section(|| format!("{:?}", path).header("Path was"))
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}
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}
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//! Handles restoration
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//!
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//! # Handling paths
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//! For single files, restoration is trivial.
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//!
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//! ## Directories
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//! In restoration, directories are restored recursively. All deleted children of a directory path are restored in this operation.
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//!
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//! # Process
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//! When determining if the recursive (directory) stratergy is needed, this happens
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//! * If the path does not exist in the database as its own atom
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//! * If there are one or more atoms prefixed with this exact path
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//!
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//! Then we use the directory stratergy
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//! ## Issues
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//! This can cause issues if a file is deleted and replaced with a directory which is then deleted. The file will be recovered before the directory.
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//! This is a bug or design flaw. (Maybe we can mitigate this with a flag to prefer the directory stratergy, or check timestamps to determine if the file or the directory was the newest one.)
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use super::*;
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//! Keeping state
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use super::*;
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use tokio::{
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sync::{
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Semaphore,
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SemaphorePermit,
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},
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};
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use futures::{
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future::OptionFuture,
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};
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/// Contains state for a set of operations
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#[derive(Debug)]
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pub struct State
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{
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cfg: config::Config,
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mtx: Option<Semaphore>,
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}
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/// Guard for operations inside state
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#[derive(Debug)]
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pub struct Permit<'a>(Option<SemaphorePermit<'a>>);
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impl State
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{
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/// Create a new state
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pub fn new(cfg: config::Config) -> Self
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{
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Self {
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mtx: cfg.limit.map(|x| Semaphore::new(x.into())),
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cfg,
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}
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}
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/// Acquire a permit for concurrent work, yielding the task if needed.
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pub async fn lock(&self) -> Permit<'_>
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{
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Permit(OptionFuture::from(self.mtx.as_ref().map(Semaphore::acquire)).await)
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}
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/// The config object
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#[inline] pub fn config(&self) -> &config::Config
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{
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&self.cfg
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}
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}
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