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
|
use axum::extract::Query;
use axum::http::StatusCode;
use axum::response::Response;
use axum::{body::Body, response::IntoResponse};
use axum_extra::{headers::Range, TypedHeader};
use axum_range::{KnownSize, Ranged};
use bytes::Bytes;
use data_encoding::BASE64URL_NOPAD;
use futures::TryStreamExt;
use nix_compat::{nix_http, nixbase32};
use serde::Deserialize;
use std::io;
use tokio_util::io::ReaderStream;
use tracing::{instrument, warn, Span};
use tvix_store::nar::ingest_nar_and_hash;
use crate::AppState;
#[derive(Debug, Deserialize)]
pub(crate) struct GetNARParams {
#[serde(rename = "narsize")]
nar_size: u64,
}
#[instrument(skip(blob_service, directory_service))]
pub async fn get_head(
method: axum::http::Method,
ranges: Option<TypedHeader<Range>>,
axum::extract::Path(root_node_enc): axum::extract::Path<String>,
axum::extract::Query(GetNARParams { nar_size }): Query<GetNARParams>,
axum::extract::State(AppState {
blob_service,
directory_service,
..
}): axum::extract::State<AppState>,
) -> Result<impl axum::response::IntoResponse, StatusCode> {
use prost::Message;
// b64decode the root node passed *by the user*
let root_node_proto = BASE64URL_NOPAD
.decode(root_node_enc.as_bytes())
.map_err(|e| {
warn!(err=%e, "unable to decode root node b64");
StatusCode::NOT_FOUND
})?;
// check the proto size to be somewhat reasonable before parsing it.
if root_node_proto.len() > 4096 {
warn!("rejected too large root node");
return Err(StatusCode::BAD_REQUEST);
}
// parse the proto
let root_node: tvix_castore::proto::Node = Message::decode(Bytes::from(root_node_proto))
.map_err(|e| {
warn!(err=%e, "unable to decode root node proto");
StatusCode::NOT_FOUND
})?;
let (root_name, root_node) = root_node.into_name_bytes_and_node().map_err(|e| {
warn!(err=%e, "root node validation failed");
StatusCode::BAD_REQUEST
})?;
if !root_name.as_ref().is_empty() {
warn!("root node has name, which it shouldn't");
return Err(StatusCode::BAD_REQUEST);
}
Ok((
// headers
[
("cache-control", "max-age=31536000, immutable"),
("content-type", nix_http::MIME_TYPE_NAR),
],
if method == axum::http::Method::HEAD {
// If this is a HEAD request, construct a response returning back the
// user-provided content-length, but don't actually talk to castore.
Response::builder()
.header("content-length", nar_size)
.body(Body::empty())
.unwrap()
} else if let Some(TypedHeader(ranges)) = ranges {
// If this is a range request, construct a seekable NAR reader.
let r =
tvix_store::nar::seekable::Reader::new(root_node, blob_service, directory_service)
.await
.map_err(|e| {
warn!(err=%e, "failed to construct seekable nar reader");
StatusCode::INTERNAL_SERVER_ERROR
})?;
// ensure the user-supplied nar size was correct, no point returning data otherwise.
if r.stream_len() != nar_size {
warn!(
actual_nar_size = r.stream_len(),
supplied_nar_size = nar_size,
"wrong nar size supplied"
);
return Err(StatusCode::BAD_REQUEST);
}
Ranged::new(Some(ranges), KnownSize::sized(r, nar_size)).into_response()
} else {
// use the non-seekable codepath if there's no range(s) requested,
// as it uses less memory.
let (w, r) = tokio::io::duplex(1024 * 8);
// spawn a task rendering the NAR to the client.
tokio::spawn(async move {
if let Err(e) =
tvix_store::nar::write_nar(w, &root_node, blob_service, directory_service).await
{
warn!(err=%e, "failed to write out NAR");
}
});
Response::builder()
.header("content-length", nar_size)
.body(Body::from_stream(ReaderStream::new(r)))
.unwrap()
},
))
}
#[instrument(skip(blob_service, directory_service, request))]
pub async fn put(
axum::extract::Path(nar_str): axum::extract::Path<String>,
axum::extract::State(AppState {
blob_service,
directory_service,
root_nodes,
..
}): axum::extract::State<AppState>,
request: axum::extract::Request,
) -> Result<&'static str, StatusCode> {
let (nar_hash_expected, compression_suffix) =
nix_http::parse_nar_str(&nar_str).ok_or(StatusCode::UNAUTHORIZED)?;
// No paths with compression suffix are supported.
if !compression_suffix.is_empty() {
warn!(%compression_suffix, "invalid compression suffix requested");
return Err(StatusCode::UNAUTHORIZED);
}
let s = request.into_body().into_data_stream();
let mut r = tokio_util::io::StreamReader::new(s.map_err(|e| {
warn!(err=%e, "failed to read request body");
io::Error::new(io::ErrorKind::BrokenPipe, e.to_string())
}));
// ingest the NAR
let (root_node, nar_hash_actual, nar_size) =
ingest_nar_and_hash(blob_service.clone(), directory_service.clone(), &mut r)
.await
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))
.map_err(|e| {
warn!(err=%e, "failed to ingest nar");
StatusCode::INTERNAL_SERVER_ERROR
})?;
let s = Span::current();
s.record("nar_hash.expected", nixbase32::encode(&nar_hash_expected));
s.record("nar_size", nar_size);
if nar_hash_expected != nar_hash_actual {
warn!(
nar_hash.expected = nixbase32::encode(&nar_hash_expected),
nar_hash.actual = nixbase32::encode(&nar_hash_actual),
"nar hash mismatch"
);
return Err(StatusCode::BAD_REQUEST);
}
// store mapping of narhash to root node into root_nodes.
// we need it later to populate the root node when accepting the PathInfo.
root_nodes.write().put(nar_hash_actual, root_node);
Ok("")
}
// FUTUREWORK: maybe head by narhash. Though not too critical, as we do
// implement HEAD for .narinfo.
|
