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use std::{ffi::OsString, path::PathBuf};
use inotify::{Event, EventMask, Inotify, WatchMask};
use serde::{Deserialize, Serialize};
#[derive(Serialize, Deserialize, Debug)]
pub enum EventType {
ADD,
REMOVE,
}
#[derive(Serialize, Deserialize, Debug)]
pub struct DiscoverOp {
pub ops_dir: PathBuf,
pub event_type: EventType,
pub operation_name: String,
}
#[derive(thiserror::Error, Debug)]
#[allow(clippy::enum_variant_names)]
pub enum DynamicDiscoverOpsError {
#[error("Failed to add watch to directory: {0}")]
FailedtoAddWatch(String),
#[error("A non-UTF8 name cannot be used as an operation name: {0:?}")]
NotAnOperationName(OsString),
#[error(transparent)]
EventError(#[from] std::io::Error),
}
pub fn create_inotify_watch(ops_dir: PathBuf) -> Result<Inotify, DynamicDiscoverOpsError> {
let mut inotify = Inotify::init()?;
inotify
.add_watch(ops_dir.clone(), WatchMask::CLOSE_WRITE | WatchMask::DELETE)
.map_err(|_| {
DynamicDiscoverOpsError::FailedtoAddWatch(ops_dir.to_string_lossy().to_string())
})?;
Ok(inotify)
}
pub fn create_inofity_event_stream(
ops_dir: PathBuf,
) -> Result<inotify::EventStream<[u8; 1024]>, DynamicDiscoverOpsError> {
let buffer = [0; 1024];
let mut ino = create_inotify_watch(ops_dir)?;
Ok(ino.event_stream(buffer)?)
}
pub fn process_inotify_events(
ops_dir: PathBuf,
event: Event<OsString>,
) -> Result<Option<DiscoverOp>, DynamicDiscoverOpsError> {
if let Some(ops_name) = event.clone().name {
let operation_name = ops_name
.to_str()
.ok_or(DynamicDiscoverOpsError::NotAnOperationName(
ops_name.clone(),
));
match operation_name {
Ok(ops_name) => match event.mask {
EventMask::DELETE => {
return Ok(Some(DiscoverOp {
ops_dir,
event_type: EventType::REMOVE,
operation_name: ops_name.to_string(),
}))
}
EventMask::CLOSE_WRITE => {
return Ok(Some(DiscoverOp {
ops_dir,
event_type: EventType::ADD,
operation_name: ops_name.to_string(),
}))
}
_ => return Ok(None),
},
Err(e) => return Err(e),
}
}
Ok(None)
}
#[cfg(test)]
#[test]
fn create_inotify_with_non_existing_dir() {
let err = create_inotify_watch("/tmp/discover_ops".into()).unwrap_err();
assert_eq!(
err.to_string(),
"Failed to add watch to directory: /tmp/discover_ops"
);
}
#[test]
fn create_inotify_with_right_directory() {
use tempfile::TempDir;
let dir = TempDir::new().unwrap().into_path();
let res = create_inotify_watch(dir);
assert!(res.is_ok());
}
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