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
230
231
232
233
234
235
236
use std::{fs, net::Shutdown, path::PathBuf, sync::Arc};
use http::Uri;
use serde::Serialize;
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::TcpStream,
};
use uuid::Uuid;
use crate::{
error::{InitializationError, RenderingError},
worker::{Port, Worker},
};
pub enum JsRenderer {
Global,
PerRequest {
path: PathBuf,
},
}
pub struct SsrConfig {
pub port: u16,
pub js_worker: PathBuf,
pub global_js_renderer: Option<PathBuf>,
}
#[derive(Clone)]
pub struct Ssr {
worker: Arc<Worker>,
js_worker: PathBuf,
global_js_renderer: Option<PathBuf>,
}
impl Ssr {
pub async fn new(cfg: SsrConfig) -> Result<Self, InitializationError> {
let port = Port::new(cfg.port);
let js_worker = match fs::canonicalize(cfg.js_worker) {
Ok(path) => path,
Err(err) => return Err(InitializationError::InvalidJsWorkerPath(err)),
};
let global_js_renderer = match cfg.global_js_renderer {
Some(path) => match fs::canonicalize(path) {
Ok(path) => Some(path),
Err(err) => return Err(InitializationError::InvalidGlobalJsRendererPath(err)),
},
None => None,
};
let worker = Worker::new(&port, &js_worker, &global_js_renderer).await?;
Ok(Self {
worker: Arc::new(worker),
js_worker,
global_js_renderer,
})
}
pub async fn render<D: Serialize>(
&self,
uri: &Uri,
data: &D,
js_renderer: JsRenderer,
) -> Result<String, RenderingError> {
let request_id = Uuid::new_v4();
trace!("Starting request {}", request_id);
let worker = &self.worker;
let mut stream = match worker.connect().await {
Ok(stream) => stream,
Err(err) => {
error!(
"{worker}: Failed to connect: {err}",
worker = worker.display_with_request_id(&request_id),
err = err
);
return Err(RenderingError::ConnectionError(err));
}
};
let url = match uri.path_and_query() {
Some(url) => url,
None => {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::InvalidUri);
}
};
let request_renderer = match (&self.global_js_renderer, js_renderer) {
(Some(_), JsRenderer::Global) => None,
(_, JsRenderer::PerRequest { path }) => Some(path),
(None, JsRenderer::Global) => {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::GlobalRendererNotProvided);
}
};
let meta = json!({
"requestId": request_id,
"requestRenderer": request_renderer,
"url": json!({"path": url.path(), "query": url.query()}),
});
let meta_bytes = match serde_json::to_vec(&meta) {
Ok(bytes) => bytes,
Err(err) => {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::UrlSerializationError(err));
}
};
let data = match serde_json::to_string(&data) {
Ok(data) => data,
Err(err) => {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::DataSerializationError(err));
}
};
let data_bytes = match crate::json::to_vec(&data) {
Ok(bytes) => bytes,
Err(err) => {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::DataSerializationError(err));
}
};
let meta_len = meta_bytes.len() as u32;
let data_len = data_bytes.len() as u32;
let meta_len_bytes = meta_len.to_be_bytes();
let data_len_bytes = data_len.to_be_bytes();
let mut input = meta_len_bytes.to_vec();
input.extend_from_slice(&data_len_bytes);
input.extend(meta_bytes);
input.extend(data_bytes);
let mut res = String::new();
trace!(
"{worker}: Writing input to socket",
worker = worker.display_with_request_id(&request_id),
);
if let Err(err) = stream.write_all(input.as_slice()).await {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::RenderRequestError(err));
};
trace!(
"{worker}: Input written to socket",
worker = worker.display_with_request_id(&request_id),
);
if let Err(err) = stream.read_to_string(&mut res).await {
Self::finalize_rendering_session(&worker, &stream, &request_id);
return Err(RenderingError::RenderResponseError(err));
};
trace!(
"{worker}: Output written to result buffer",
worker = worker.display_with_request_id(&request_id),
);
if res.starts_with("ERROR:") {
trace!(
"{worker}: Output is an error",
worker = worker.display_with_request_id(&request_id),
);
match res.splitn(2, ':').collect::<Vec<_>>().as_slice() {
["ERROR", stack] => Err(RenderingError::JsExceptionDuringRendering(
stack.to_string(),
)),
_ => unreachable!(),
}
} else {
trace!(
"{worker}: Output is ok",
worker = worker.display_with_request_id(&request_id),
);
Self::finalize_rendering_session(&worker, &stream, &request_id);
Ok(res)
}
}
fn finalize_rendering_session(worker: &Worker, connection: &TcpStream, request_id: &Uuid) {
if let Err(err) = connection.shutdown(Shutdown::Both) {
warn!(
"{worker}: Failed to shutdown connection to the js worker: {err}",
worker = worker.display_with_request_id(&request_id),
err = err
);
};
}
}