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use std::{
io::{BufReader, Read, Seek, SeekFrom},
sync::{Arc, RwLock},
};
use crate::{
Journal2, LogConfig, LogFsError, crypto::Crypto, journal::SequenceId, state::KeyPointer,
};
use super::{
RepairConfig, data, determine_file_size, find_entry_header_in_slice, read, read_entry,
};
pub fn repair(
log_config: &LogConfig,
crypto: Option<Arc<Crypto>>,
config: RepairConfig,
) -> Result<(), LogFsError> {
// TODO: tracing here instead of eprintln!
let mut f = std::fs::File::open(&log_config.path)?;
let file_size = determine_file_size(&mut f)?;
let mut file_offset = config.skip_bytes.unwrap_or_default();
f.seek(SeekFrom::Start(file_offset))?;
let mut reader = BufReader::new(f);
// let _superblock = match reader.read_superblocks() {
// Ok(s) => Some(s),
// Err(error) => {
// tracing::warn!(?error, "could not read superblocks");
// None
// }
// };
let sequence = config.start_sequence.unwrap_or(SequenceId::from_u64(1));
let mut buffer = Vec::new();
let mut entry_and_offset = None;
loop {
let chunk_len = std::cmp::min(100_000, file_size - file_offset);
if chunk_len == 0 {
break;
}
let file_progress = format!("{}%", (file_offset / file_size) * 100);
tracing::trace!(?sequence, %file_offset, %file_progress, "searching for log entry");
buffer.resize(chunk_len as usize, 0);
reader.read_exact(&mut buffer)?;
if let Some((header, buffer_offset)) =
find_entry_header_in_slice(crypto.as_deref(), sequence, &buffer)
{
entry_and_offset = Some((header, file_offset + buffer_offset));
break;
}
file_offset += chunk_len;
}
let (header, offset) = entry_and_offset
.ok_or_else(|| LogFsError::new_internal("Could not find log entries in data"))?;
tracing::trace!(?header, offset, "found entry header");
reader.seek(SeekFrom::Start(offset))?;
let crypto_ref = crypto.as_deref();
let mut buffer = Vec::new();
let mut sequence = header.sequence_id;
let mut state = crate::state::State::new();
loop {
let entry = match read_entry(&mut reader, &mut buffer, crypto_ref, sequence) {
Ok(entry) => entry,
Err(error) => {
tracing::warn!(?error, "could not read entry. stopping read recovery");
break;
}
};
let data_offset = reader.stream_position()?;
let payload_len = entry.action.payload_len(crypto_ref);
if let Err(error) = reader.seek(SeekFrom::Current(payload_len as i64)) {
tracing::warn!(
?entry,
?error,
"entry is missing payload. stopping read recovery"
);
break;
}
tracing::trace!(?entry, "recovered entry");
match entry.action {
data::JournalAction::KeyInsert(k) => {
let meta = k.meta;
state.add_key(
meta.path,
KeyPointer {
sequence_id: entry.header.sequence_id.as_u64(),
file_offset: data_offset,
size: meta.size,
chunk_size: meta.chunk_size,
},
);
}
data::JournalAction::KeyRename(r) => {
for rename in r.renames {
state.rename_key(&rename.old_key, rename.new_key).unwrap();
}
}
data::JournalAction::KeyDelete(d) => {
for path in d.deleted_keys {
state.remove_key(&path);
}
}
data::JournalAction::IndexWrite(_) => {}
data::JournalAction::Batch(batch) => {
for rename in batch.renames {
if let Err(_err) = state.rename_key(&rename.old_key, rename.new_key) {
tracing::trace!("Log entry tried to rename a key that does not exist");
}
}
for deleted_key in &batch.deleted_keys {
if state.remove_key(deleted_key).is_none() {
tracing::trace!("Log entry tried to delete a key that does not exist");
}
}
}
};
// TODO: handle error
sequence = sequence.try_increment()?;
}
if state.tree.is_empty() {
return Err(LogFsError::new_internal("Could not recovery any data"));
}
tracing::info!(key_count = state.tree.len(), "recovered keys");
let target_path = match config.recovery_path {
Some(p) => p,
None => {
tracing::info!("Stopping recovery. Specify recovery path to persist.");
return Ok(());
}
};
let new_state = Arc::new(RwLock::new(crate::state::State::new()));
let new_config = LogConfig {
allow_create: true,
..log_config.clone()
};
let j = Journal2::open(target_path, new_state.clone(), crypto.clone(), &new_config)?;
let mut file = reader.into_inner();
for (key, pointer) in state.tree {
tracing::trace!(?key, "restoring key");
let reader = read::KeyDataReader::new(crypto.clone(), &pointer, file)?;
// TODO: partial writes to allow recovering large files / safe memory.
let (data, f) = reader.read_all()?;
j.write_insert(
key.clone(),
data,
pointer.chunk_size.unwrap_or(log_config.default_chunk_size),
)?;
file = f;
tracing::debug!(?key, "key restored");
}
tracing::info!("recovery complete");
// match reader.read_superblocks() {
// Ok(b) => {
// tracing::info!(superblock=?b, "found superblock");
// }
// Err(error) => {
// tracing::warn!(?error, "could not read superblocks");
// }
// }
// reader.reader.seek(SeekFrom::Start(0))?;
// reader.offset = 0;
// // reader.skip_superblocks()?;
// tracing::info!("searching for log entries");
// let mut entry = None;
// let mut count = 0;
// let mut offset = reader.reader.stream_position()?;
// let sequence = config.start_sequence.unwrap_or(SequenceId::from_u64(1));
// tracing::info!(target_sequence=?sequence, "Trying to find start entry");
// reader.next_sequence = sequence;
// loop {
// reader.reader.seek(SeekFrom::Start(offset))?;
// reader.offset = offset;
// match reader.next_entry() {
// Ok(e) => {
// if e.entry.header.sequence_id == sequence {
// entry = Some(e);
// tracing::info!(?sequence, "Found desired start entry");
// break;
// } else {
// tracing::warn!(entry=?e, "Found entry, but not with the desired sequence");
// }
// }
// Err(error) => {
// if !error.to_string().contains("not decrypt") {
// tracing::trace!(%error, "could not read entry");
// }
// }
// }
// offset += 1;
// if offset % 10000 == 0 {
// tracing::trace!(
// target_sequence=?sequence,
// current_offset=%offset,
// "still trying to find start entry"
// );
// }
// }
// loop {
// match reader.next_entry() {
// Ok(e) => {
// entry = Some(e);
// count += 1;
// }
// Err(error) => {
// tracing::warn!(?error, count = count + 1, "Could not read entry");
// break;
// }
// }
// }
// let last_entry = entry
// .ok_or_else(|| LogFsError::new_internal("Could not find any restorable entries"))?;
// tracing::info!(
// entry_count=count,
// sequence_id=?last_entry.entry.header.sequence_id,
// "Found entries that can be restored"
// );
// if config.dry_run {
// return Ok(());
// }
// let tainted = TaintedFlag::new();
// let reader_pos = reader.reader.stream_position()?;
// let mut file = reader.reader.into_inner();
// file.seek(SeekFrom::Start(reader_pos))?;
// let superblock = IndexedSuperBlock {
// block: data::Superblock {
// format_version: data::LogFormatVersion::V2,
// flags: data::SuperblockFlags::empty(),
// tail_offset: reader_pos,
// last_index_entry: None,
// active_sequence: last_entry.entry.header.sequence_id.as_u64(),
// },
// index: 1,
// };
// let mut writer = LogWriter::open(crypto.clone(), tainted.clone(), file, superblock)?;
// writer.write_next_superblock()?;
// tracing::info!(
// entry_count=count,
// sequence_id=?last_entry.entry.header.sequence_id,
// "Restored superblock"
// );
Ok(())
}