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use std::sync::Arc;
use git_features::{
parallel::{self, in_parallel_if},
progress::{self, unit, Progress},
};
use super::{Error, Reducer};
use crate::{data, index, index::util};
mod options {
use std::sync::{atomic::AtomicBool, Arc};
use crate::index::traverse::SafetyCheck;
/// Traversal options for [`traverse()`][crate::index::File::traverse_with_lookup()]
#[derive(Debug, Clone)]
pub struct Options {
/// If `Some`, only use the given amount of threads. Otherwise, the amount of threads to use will be selected based on
/// the amount of available logical cores.
pub thread_limit: Option<usize>,
/// The kinds of safety checks to perform.
pub check: SafetyCheck,
/// A flag to indicate whether the algorithm should be interrupted. Will be checked occasionally allow stopping a running
/// computation.
pub should_interrupt: Arc<AtomicBool>,
}
impl Default for Options {
fn default() -> Self {
Self {
thread_limit: Default::default(),
check: Default::default(),
should_interrupt: Default::default(),
}
}
}
}
use std::sync::atomic::Ordering;
use git_features::threading::{lock, Mutable, OwnShared};
pub use options::Options;
/// Verify and validate the content of the index file
impl index::File {
/// Iterate through all _decoded objects_ in the given `pack` and handle them with a `Processor` using a cache to reduce the amount of
/// waste while decoding objects.
///
/// For more details, see the documentation on the [`traverse()`][index::File::traverse()] method.
pub fn traverse_with_lookup<P, C, Processor, E>(
&self,
new_processor: impl Fn() -> Processor + Send + Clone,
new_cache: impl Fn() -> C + Send + Clone,
mut progress: P,
pack: &crate::data::File,
Options {
thread_limit,
check,
should_interrupt,
}: Options,
) -> Result<(git_hash::ObjectId, index::traverse::Outcome, P), Error<E>>
where
P: Progress,
C: crate::cache::DecodeEntry,
E: std::error::Error + Send + Sync + 'static,
Processor: FnMut(
git_object::Kind,
&[u8],
&index::Entry,
&mut <<P as Progress>::SubProgress as Progress>::SubProgress,
) -> Result<(), E>,
{
let (verify_result, traversal_result) = parallel::join(
{
let pack_progress = progress.add_child("SHA1 of pack");
let index_progress = progress.add_child("SHA1 of index");
let should_interrupt = Arc::clone(&should_interrupt);
move || {
let res = self.possibly_verify(
pack,
check,
pack_progress,
index_progress,
Arc::clone(&should_interrupt),
);
if res.is_err() {
should_interrupt.store(true, Ordering::SeqCst);
}
res
}
},
|| {
let index_entries =
util::index_entries_sorted_by_offset_ascending(self, progress.add_child("collecting sorted index"));
let (chunk_size, thread_limit, available_cores) =
parallel::optimize_chunk_size_and_thread_limit(1000, Some(index_entries.len()), thread_limit, None);
let there_are_enough_entries_to_process = || index_entries.len() > chunk_size * available_cores;
let input_chunks = index_entries.chunks(chunk_size.max(chunk_size));
let reduce_progress = OwnShared::new(Mutable::new({
let mut p = progress.add_child("Traversing");
p.init(Some(self.num_objects() as usize), progress::count("objects"));
p
}));
let state_per_thread = {
let reduce_progress = reduce_progress.clone();
move |index| {
(
new_cache(),
new_processor(),
Vec::with_capacity(2048), // decode buffer
lock(&reduce_progress).add_child(format!("thread {}", index)), // per thread progress
)
}
};
in_parallel_if(
there_are_enough_entries_to_process,
input_chunks,
thread_limit,
state_per_thread,
|entries: &[index::Entry],
(cache, ref mut processor, buf, progress)|
-> Result<Vec<data::decode_entry::Outcome>, Error<_>> {
progress.init(
Some(entries.len()),
Some(unit::dynamic(unit::Human::new(
unit::human::Formatter::new(),
"objects",
))),
);
let mut stats = Vec::with_capacity(entries.len());
for index_entry in entries.iter() {
let result = self.decode_and_process_entry(
check,
pack,
cache,
buf,
progress,
index_entry,
processor,
);
progress.inc();
let stat = match result {
Err(err @ Error::PackDecode { .. }) if !check.fatal_decode_error() => {
progress.info(format!("Ignoring decode error: {}", err));
continue;
}
res => res,
}?;
stats.push(stat);
}
Ok(stats)
},
Reducer::from_progress(reduce_progress, pack.data_len(), check, &should_interrupt),
)
},
);
let id = verify_result?;
let res = traversal_result?;
Ok((id, res, progress))
}
}