1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
// Authors: Robert Lopez
pub(crate) mod attempt_batch;
pub(crate) mod state;
use crate::{
data_file::DataFile, error::Error, uncorrupt::UncorruptAction, wal::BlockDBLog, BlockDB,
BlockKey,
};
use state::{BlockDBUpdateState, DataFileUpdateState, FailedBatchState};
use std::sync::Arc;
use tokio::sync::RwLock;
#[derive(Debug, Clone)]
pub struct BatchResult {
pub freed_bytes: usize,
pub new_block_keys: Vec<BlockKey>,
}
impl BlockDB {
/// Performs a batch of writes followed by a batch of frees,
/// combined into a single atomic operation.
///
/// Returns:
/// - A `Vec<BlockKey>` containing the keys for the newly written `DataBlock`s,
/// in the same order they were provided.
/// - The total number of bytes freed by the batch delete.
///
/// ---
/// - **Atomic**
/// - **Corruptible**
///
/// ---
/// Example
/// ```
/// let mut block_db = BlockDB::open("./data", None).await?;
///
/// let block_key = block_db.write(b"Shark").await?;
///
/// let BatchResult {
/// freed_bytes,
/// new_block_keys,
/// } = block_db
/// .batch(
/// vec![b"Hello", b"World"],
/// vec![&block_key]
/// ).await?;
/// ```
pub async fn batch<Bytes: AsRef<[u8]>>(
&mut self,
writes: Vec<Bytes>,
frees: Vec<&BlockKey>,
) -> Result<BatchResult, Error> {
macro_rules! return_corrupted_error {
($err:expr, $data_file_ids_to_delete:expr, $data_file_inverse_log_map:expr) => {
return Err(Error::Corrupted {
err: Box::new($err),
action: UncorruptAction::BadBatchUnwind {
data_file_ids_to_delete: $data_file_ids_to_delete,
data_file_inverse_log_map: $data_file_inverse_log_map,
},
});
};
}
match self.attempt_batch(writes, frees).await {
Ok(BlockDBUpdateState {
logs,
freed_bytes,
new_block_keys,
new_data_file_map,
data_file_log_map,
data_file_update_map,
data_file_inverse_log_map,
}) => {
self.wal.write().await.log_many(&logs).await?;
let added_data_file_ids = logs
.iter()
.filter_map(|log| {
if let BlockDBLog::AddDataFile(data_file_id) = log {
Some(data_file_id.to_string())
} else {
debug_assert!(
matches!(log, BlockDBLog::AddDataFile(_)),
"BlockDBUpdateState.logs had a invalid Log {log:?}"
);
None
}
})
.collect::<Vec<String>>();
let mut data_files_writer = self.data_files.write().await;
data_files_writer.extend(new_data_file_map);
let mut logged_data_files: Vec<Arc<RwLock<DataFile>>> = vec![];
for (data_file_id, data_file_logs) in data_file_log_map {
if let Some(data_file) = data_files_writer.get(&data_file_id) {
if let Err(err) =
data_file.write().await.wal.log_many(&data_file_logs).await
{
for logged_data_file in logged_data_files {
let mut logged_data_file_writer = logged_data_file.write().await;
if let Err(err) = logged_data_file_writer.wal.undo().await {
return_corrupted_error!(
Error::Walr(err),
added_data_file_ids,
data_file_inverse_log_map
);
} else if let Err(err) = logged_data_file_writer.recover().await {
return_corrupted_error!(
err,
added_data_file_ids,
data_file_inverse_log_map
);
}
}
return_corrupted_error!(
Error::Walr(err),
added_data_file_ids,
data_file_inverse_log_map
);
}
logged_data_files.push(data_file.clone());
}
}
for (
data_file_id,
DataFileUpdateState {
new_size,
new_free_bytes,
new_used_bytes,
new_data_blocks,
new_free_chunk_offsets,
},
) in data_file_update_map
{
if let Some(data_file) = data_files_writer.get(&data_file_id) {
let mut data_file_writer = data_file.write().await;
data_file_writer.size = new_size;
data_file_writer.free_bytes = new_free_bytes;
data_file_writer.used_bytes = new_used_bytes;
data_file_writer.data_blocks = new_data_blocks;
data_file_writer.free_chunk_offsets = new_free_chunk_offsets;
}
}
Ok(BatchResult {
freed_bytes,
new_block_keys,
})
}
Err(FailedBatchState {
err,
data_file_inverse_log_map,
}) => {
return_corrupted_error!(err, vec![], data_file_inverse_log_map);
}
}
}
}