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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
use crate::utils::AsyncIoBridge;
use super::{NarCalculationService, RenderError};
use count_write::CountWrite;
use nix_compat::nar::writer::r#async as nar_writer;
use sha2::{Digest, Sha256};
use tokio::io::{self, AsyncWrite, BufReader};
use tonic::async_trait;
use tracing::{instrument, Span};
use tracing_indicatif::span_ext::IndicatifSpanExt;
use tvix_castore::{
blobservice::BlobService,
directoryservice::DirectoryService,
proto::{self as castorepb, NamedNode},
};
pub struct SimpleRenderer<BS, DS> {
blob_service: BS,
directory_service: DS,
}
impl<BS, DS> SimpleRenderer<BS, DS> {
pub fn new(blob_service: BS, directory_service: DS) -> Self {
Self {
blob_service,
directory_service,
}
}
}
#[async_trait]
impl<BS, DS> NarCalculationService for SimpleRenderer<BS, DS>
where
BS: BlobService + Clone,
DS: DirectoryService + Clone,
{
async fn calculate_nar(
&self,
root_node: &castorepb::node::Node,
) -> Result<(u64, [u8; 32]), tvix_castore::Error> {
calculate_size_and_sha256(
root_node,
self.blob_service.clone(),
self.directory_service.clone(),
)
.await
.map_err(|e| tvix_castore::Error::StorageError(format!("failed rendering nar: {}", e)))
}
}
/// Invoke [write_nar], and return the size and sha256 digest of the produced
/// NAR output.
#[instrument(skip_all, fields(indicatif.pb_show=1))]
pub async fn calculate_size_and_sha256<BS, DS>(
root_node: &castorepb::node::Node,
blob_service: BS,
directory_service: DS,
) -> Result<(u64, [u8; 32]), RenderError>
where
BS: BlobService + Send,
DS: DirectoryService + Send,
{
let mut h = Sha256::new();
let mut cw = CountWrite::from(&mut h);
let span = Span::current();
span.pb_set_message("Calculating NAR");
span.pb_start();
write_nar(
// The hasher doesn't speak async. It doesn't
// actually do any I/O, so it's fine to wrap.
AsyncIoBridge(&mut cw),
root_node,
blob_service,
directory_service,
)
.await?;
Ok((cw.count(), h.finalize().into()))
}
/// Accepts a [castorepb::node::Node] pointing to the root of a (store) path,
/// and uses the passed blob_service and directory_service to perform the
/// necessary lookups as it traverses the structure.
/// The contents in NAR serialization are writen to the passed [AsyncWrite].
pub async fn write_nar<W, BS, DS>(
mut w: W,
proto_root_node: &castorepb::node::Node,
blob_service: BS,
directory_service: DS,
) -> Result<(), RenderError>
where
W: AsyncWrite + Unpin + Send,
BS: BlobService + Send,
DS: DirectoryService + Send,
{
// Initialize NAR writer
let nar_root_node = nar_writer::open(&mut w)
.await
.map_err(RenderError::NARWriterError)?;
walk_node(
nar_root_node,
proto_root_node,
blob_service,
directory_service,
)
.await?;
Ok(())
}
/// Process an intermediate node in the structure.
/// This consumes the node.
async fn walk_node<BS, DS>(
nar_node: nar_writer::Node<'_, '_>,
proto_node: &castorepb::node::Node,
blob_service: BS,
directory_service: DS,
) -> Result<(BS, DS), RenderError>
where
BS: BlobService + Send,
DS: DirectoryService + Send,
{
match proto_node {
castorepb::node::Node::Symlink(proto_symlink_node) => {
nar_node
.symlink(&proto_symlink_node.target)
.await
.map_err(RenderError::NARWriterError)?;
}
castorepb::node::Node::File(proto_file_node) => {
let digest_len = proto_file_node.digest.len();
let digest = proto_file_node.digest.clone().try_into().map_err(|_| {
RenderError::StoreError(io::Error::new(
io::ErrorKind::Other,
format!("invalid digest len {} in file node", digest_len),
))
})?;
let mut blob_reader = match blob_service
.open_read(&digest)
.await
.map_err(RenderError::StoreError)?
{
Some(blob_reader) => Ok(BufReader::new(blob_reader)),
None => Err(RenderError::NARWriterError(io::Error::new(
io::ErrorKind::NotFound,
format!("blob with digest {} not found", &digest),
))),
}?;
nar_node
.file(
proto_file_node.executable,
proto_file_node.size,
&mut blob_reader,
)
.await
.map_err(RenderError::NARWriterError)?;
}
castorepb::node::Node::Directory(proto_directory_node) => {
let digest_len = proto_directory_node.digest.len();
let digest = proto_directory_node
.digest
.clone()
.try_into()
.map_err(|_| {
RenderError::StoreError(io::Error::new(
io::ErrorKind::InvalidData,
format!("invalid digest len {} in directory node", digest_len),
))
})?;
// look it up with the directory service
match directory_service
.get(&digest)
.await
.map_err(|e| RenderError::StoreError(e.into()))?
{
// if it's None, that's an error!
None => Err(RenderError::DirectoryNotFound(
digest,
proto_directory_node.name.clone(),
))?,
Some(proto_directory) => {
// start a directory node
let mut nar_node_directory = nar_node
.directory()
.await
.map_err(RenderError::NARWriterError)?;
// We put blob_service, directory_service back here whenever we come up from
// the recursion.
let mut blob_service = blob_service;
let mut directory_service = directory_service;
// for each node in the directory, create a new entry with its name,
// and then recurse on that entry.
for proto_node in proto_directory.nodes() {
let child_node = nar_node_directory
.entry(proto_node.get_name())
.await
.map_err(RenderError::NARWriterError)?;
(blob_service, directory_service) = Box::pin(walk_node(
child_node,
&proto_node,
blob_service,
directory_service,
))
.await?;
}
// close the directory
nar_node_directory
.close()
.await
.map_err(RenderError::NARWriterError)?;
return Ok((blob_service, directory_service));
}
}
}
}
Ok((blob_service, directory_service))
}
|
