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use std::io;
use std::sync::mpsc;
use sgdata::SGData;
use slog::{trace, Level, Logger};
use slog_perf::TimeReporter;
use super::aio;
use super::{DataType, Repo};
use crate::compression::ArcCompression;
use crate::encryption::ArcEncrypter;
use crate::hashing::ArcHasher;
use crate::{Digest, Generation};
pub(crate) struct Message {
pub data: (u64, SGData),
pub data_type: DataType,
pub response_tx: mpsc::Sender<(u64, Digest)>,
}
pub(crate) struct ChunkProcessor {
repo: Repo,
rx: crossbeam_channel::Receiver<Message>,
aio: aio::AsyncIO,
log: Logger,
encrypter: ArcEncrypter,
compressor: ArcCompression,
hasher: ArcHasher,
generations: Vec<Generation>,
}
impl ChunkProcessor {
pub fn new(
repo: Repo,
rx: crossbeam_channel::Receiver<Message>,
aio: aio::AsyncIO,
encrypter: ArcEncrypter,
compressor: ArcCompression,
hasher: ArcHasher,
generations: Vec<Generation>,
) -> Self {
assert!(!generations.is_empty());
ChunkProcessor {
log: repo.log.clone(),
repo,
rx,
aio,
encrypter,
compressor,
hasher,
generations,
}
}
pub fn run(&self) {
let mut timer = TimeReporter::new_with_level(
"chunk-processing",
self.log.clone(),
Level::Debug,
);
let gen_strings: Vec<_> =
self.generations.iter().map(|gen| gen.to_string()).collect();
let last_gen_str = gen_strings.last().unwrap().to_owned();
loop {
timer.start("rx");
if let Ok(input) = self.rx.recv() {
timer.start("processing");
let Message {
data,
response_tx,
data_type,
} = input;
let (sg_id, sg) = data;
let digest = Digest(self.hasher.calculate_digest(&sg));
let mut found = false;
// lookup all generations in order, starting from current one
// and at the end try the current gen. again, in case some other
// thread/ instance just moved it from older generation to the
// current one
for gen_str in gen_strings
.iter()
.rev()
.chain([&last_gen_str].iter().cloned())
{
let chunk_path = self.repo.chunk_rel_path_by_digest(
digest.as_digest_ref(),
gen_str,
);
match self.aio.read_metadata(chunk_path.clone()).wait() {
Ok(_metadata) => {
found = true;
if gen_str == &last_gen_str {
trace!(self.log, "already exists"; "path" => %chunk_path.display());
} else {
trace!(
self.log,
"already exists in previous generation";
"path" => %chunk_path.display()
);
let dst_path =
self.repo.chunk_rel_path_by_digest(
digest.as_digest_ref(),
gen_strings.last().unwrap(),
);
self.aio
.rename(
chunk_path.clone(),
dst_path.clone(),
)
.wait()
.unwrap_or_else(|_e| {
// chunk might have been upated
// concurrently; check
// if it's already in the destination
if self
.aio
.read_metadata(dst_path.clone())
.wait()
.is_err()
{
panic!(
"rename failed {} -> {}",
chunk_path.display(),
dst_path.display()
)
}
});
}
break;
}
Err(ref e) if e.kind() == io::ErrorKind::NotFound => {}
Err(e) => panic!(
"read_metadata failed for {}, err: {}",
chunk_path.display(),
e
),
}
}
if !found {
let chunk_path = self.repo.chunk_rel_path_by_digest(
digest.as_digest_ref(),
gen_strings.last().unwrap(),
);
let sg = if data_type.should_compress() {
trace!(self.log, "compress"; "path" => %chunk_path.display());
timer.start("compress");
self.compressor.compress(sg).unwrap()
} else {
sg
};
let sg = if data_type.should_encrypt() {
trace!(self.log, "encrypt"; "path" => %chunk_path.display());
timer.start("encrypt");
self.encrypter.encrypt(sg, &digest.0).unwrap()
} else {
sg
};
timer.start("tx-writer");
self.aio.write_checked_idempotent(
self.repo.chunk_rel_path_by_digest(
digest.as_digest_ref(),
&last_gen_str,
),
sg,
);
}
timer.start("tx-digest");
response_tx
.send((sg_id, digest))
.expect("chunk_processor: digests_tx.send")
} else {
return;
}
}
}
}