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use super::*;
use crate::backends::maildir::backend::move_to_cur;
use core::future::Future;
use core::pin::Pin;
use futures::stream::{FuturesUnordered, StreamExt};
use futures::task::{Context, Poll};
use std::io::{self, Read};
use std::os::unix::fs::PermissionsExt;
use std::path::PathBuf;
use std::result;
use std::sync::{Arc, Mutex};
pub struct MaildirStream {
payloads: Pin<
Box<
FuturesUnordered<Pin<Box<dyn Future<Output = Result<Vec<Envelope>>> + Send + 'static>>>,
>,
>,
}
impl MaildirStream {
pub fn new(
name: &str,
mailbox_hash: MailboxHash,
unseen: Arc<Mutex<usize>>,
total: Arc<Mutex<usize>>,
mut path: PathBuf,
root_path: PathBuf,
map: HashIndexes,
mailbox_index: Arc<Mutex<HashMap<EnvelopeHash, MailboxHash>>>,
) -> Result<Pin<Box<dyn Stream<Item = Result<Vec<Envelope>>> + Send + 'static>>> {
let chunk_size = 2048;
path.push("new");
for d in path.read_dir()? {
if let Ok(p) = d {
move_to_cur(p.path()).ok().take();
}
}
path.pop();
path.push("cur");
let iter = path.read_dir()?;
let count = path.read_dir()?.count();
let mut files: Vec<PathBuf> = Vec::with_capacity(count);
for e in iter {
let e = e.and_then(|x| {
let path = x.path();
Ok(path)
})?;
files.push(e);
}
let payloads = Box::pin(if !files.is_empty() {
files
.chunks(chunk_size)
.map(|chunk| {
let cache_dir = xdg::BaseDirectories::with_profile("meli", &name).unwrap();
Box::pin(Self::chunk(
SmallVec::from(chunk),
cache_dir,
mailbox_hash,
unseen.clone(),
total.clone(),
root_path.clone(),
map.clone(),
mailbox_index.clone(),
)) as Pin<Box<dyn Future<Output = _> + Send + 'static>>
})
.collect::<_>()
} else {
FuturesUnordered::new()
});
Ok(Self { payloads }.boxed())
}
async fn chunk(
chunk: SmallVec<[std::path::PathBuf; 2048]>,
cache_dir: xdg::BaseDirectories,
mailbox_hash: MailboxHash,
unseen: Arc<Mutex<usize>>,
total: Arc<Mutex<usize>>,
root_path: PathBuf,
map: HashIndexes,
mailbox_index: Arc<Mutex<HashMap<EnvelopeHash, MailboxHash>>>,
) -> Result<Vec<Envelope>> {
let mut local_r: Vec<Envelope> = Vec::with_capacity(chunk.len());
let mut unseen_total: usize = 0;
let mut buf = Vec::with_capacity(4096);
for file in chunk {
let file_name = PathBuf::from(&file)
.strip_prefix(&root_path)
.unwrap()
.to_path_buf();
if let Some(cached) = cache_dir.find_cache_file(&file_name) {
let cached_file = fs::File::open(&cached)?;
let filesize = cached_file.metadata()?.len();
let reader = io::BufReader::new(cached_file);
let result: result::Result<Envelope, _> = bincode::Options::deserialize_from(
bincode::Options::with_limit(
bincode::config::DefaultOptions::new(),
2 * filesize,
),
reader,
);
if let Ok(env) = result {
let mut map = map.lock().unwrap();
let map = map.entry(mailbox_hash).or_default();
let hash = env.hash();
map.insert(hash, file.clone().into());
mailbox_index.lock().unwrap().insert(hash, mailbox_hash);
if !env.is_seen() {
unseen_total += 1;
}
local_r.push(env);
continue;
}
let _ = fs::remove_file(&cached);
};
let env_hash = get_file_hash(&file);
{
let mut map = map.lock().unwrap();
let map = map.entry(mailbox_hash).or_default();
map.insert(env_hash, PathBuf::from(&file).into());
}
let mut reader = io::BufReader::new(fs::File::open(&file)?);
buf.clear();
reader.read_to_end(&mut buf)?;
match Envelope::from_bytes(buf.as_slice(), Some(file.flags())) {
Ok(mut env) => {
env.set_hash(env_hash);
mailbox_index.lock().unwrap().insert(env_hash, mailbox_hash);
if let Ok(cached) = cache_dir.place_cache_file(file_name) {
let f = fs::File::create(cached)?;
let metadata = f.metadata()?;
let mut permissions = metadata.permissions();
permissions.set_mode(0o600);
f.set_permissions(permissions)?;
let writer = io::BufWriter::new(f);
bincode::Options::serialize_into(
bincode::config::DefaultOptions::new(),
writer,
&env,
)?;
}
if !env.is_seen() {
unseen_total += 1;
}
local_r.push(env);
}
Err(err) => {
debug!(
"DEBUG: hash {}, path: {} couldn't be parsed, {}",
env_hash,
file.as_path().display(),
err,
);
continue;
}
}
}
*total.lock().unwrap() += local_r.len();
*unseen.lock().unwrap() += unseen_total;
Ok(local_r)
}
}
impl Stream for MaildirStream {
type Item = Result<Vec<Envelope>>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let payloads = self.payloads.as_mut();
payloads.poll_next(cx)
}
}