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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
#[macro_use]
extern crate log;
extern crate http;
extern crate httparse;
extern crate num_cpus;
extern crate scoped_threadpool;
extern crate time;
pub use http::method::Method;
pub use http::response::Builder as ResponseBuilder;
pub use http::response::{Builder, Parts, Response};
pub use http::status::{InvalidStatusCode, StatusCode};
pub use http::Request;
use scoped_threadpool::Pool;
use std::env;
use std::fmt;
use std::fs::File;
use std::io::prelude::*;
use std::net::{TcpListener, TcpStream};
use std::path::{Path, PathBuf};
use std::time::Duration;
use std::borrow::Borrow;
mod error;
mod parsing;
mod request;
pub use error::Error;
pub type ResponseResult = Result<Response<Vec<u8>>, Error>;
pub type Handler =
Box<dyn Fn(Request<Vec<u8>>, ResponseBuilder) -> ResponseResult + 'static + Send + Sync>;
pub struct Server {
handler: Handler,
timeout: Option<Duration>,
static_directory: Option<PathBuf>,
}
impl fmt::Debug for Server {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"Server {{ timeout: {:?}, static_directory: {:?} }}",
self.timeout, self.static_directory
)
}
}
impl Server {
pub fn new<H>(handler: H) -> Server
where
H: Fn(Request<Vec<u8>>, ResponseBuilder) -> ResponseResult + 'static + Send + Sync,
{
Server {
handler: Box::new(handler),
timeout: None,
static_directory: Some(PathBuf::from("public")),
}
}
pub fn with_timeout<H>(timeout: Duration, handler: H) -> Server
where
H: Fn(Request<Vec<u8>>, ResponseBuilder) -> ResponseResult + 'static + Send + Sync,
{
Server {
handler: Box::new(handler),
timeout: Some(timeout),
static_directory: Some(PathBuf::from("public")),
}
}
pub fn listen(&self, host: &str, port: &str) -> ! {
let listener =
TcpListener::bind(format!("{}:{}", host, port)).expect("Error starting the server.");
info!("Server started at http://{}:{}", host, port);
self.listen_on_socket(listener)
}
pub fn listen_on_socket(&self, listener: TcpListener) -> ! {
const READ_TIMEOUT_MS: u64 = 20;
let num_threads = self.pool_size();
let mut pool = Pool::new(num_threads);
let mut incoming = listener.incoming();
loop {
let stream = incoming.next().unwrap();
let stream = stream.expect("Error handling TCP stream.");
stream
.set_read_timeout(Some(Duration::from_millis(READ_TIMEOUT_MS)))
.expect("FATAL: Couldn't set read timeout on socket");
pool.scoped(|scope| {
scope.execute(|| {
self.handle_connection(stream)
.expect("Error handling connection.");
});
});
}
}
pub fn set_static_directory<P: Into<PathBuf>>(&mut self, path: P) {
self.static_directory = Some(path.into());
}
pub fn dont_serve_static_files(&mut self) {
self.static_directory = None;
}
fn pool_size(&self) -> u32 {
const NUM_THREADS: &str = "SIMPLESERVER_THREADS";
let logical_cores = num_cpus::get() as u32;
match env::var(NUM_THREADS) {
Ok(v) => v.parse::<u32>().unwrap_or(logical_cores),
Err(_) => logical_cores,
}
}
fn handle_connection(&self, mut stream: TcpStream) -> Result<(), Error> {
let request = match request::read(&mut stream, self.timeout) {
Err(Error::ConnectionClosed) | Err(Error::Timeout) | Err(Error::HttpParse(_)) => {
return Ok(())
}
Err(Error::RequestTooLarge) => {
let resp = Response::builder()
.status(StatusCode::PAYLOAD_TOO_LARGE)
.body("<h1>413</h1><p>Request too large!<p>".as_bytes())
.unwrap();
write_response(resp, stream)?;
return Ok(());
}
Err(e) => return Err(e),
Ok(r) => r,
};
let mut response_builder = Response::builder();
if let Some(ref static_directory) = self.static_directory {
let fs_path = request.uri().to_string();
let fs_path = PathBuf::from(&fs_path[1..]);
let traversal_attempt = fs_path.components().any(|component| match component {
std::path::Component::Normal(_) => false,
_ => true,
});
if traversal_attempt {
response_builder.status(StatusCode::NOT_FOUND);
let response = response_builder
.body("<h1>404</h1><p>Not found!<p>".as_bytes())
.unwrap();
write_response(response, stream)?;
return Ok(());
}
let fs_path = static_directory.join(fs_path);
if Path::new(&fs_path).is_file() {
let mut f = File::open(&fs_path)?;
let mut source = Vec::new();
f.read_to_end(&mut source)?;
let response = response_builder.body(source)?;
write_response(response, stream)?;
return Ok(());
}
}
match (self.handler)(request, response_builder) {
Ok(response) => Ok(write_response(response, stream)?),
Err(_) => {
let mut response_builder = Response::builder();
response_builder.status(StatusCode::INTERNAL_SERVER_ERROR);
let response = response_builder
.body("<h1>500</h1><p>Internal Server Error!<p>".as_bytes())
.unwrap();
Ok(write_response(response, stream)?)
}
}
}
}
fn write_response<T: Borrow<[u8]>, S: Write>(
response: Response<T>,
mut stream: S,
) -> Result<(), Error> {
use fmt::Write;
let (parts, body) = response.into_parts();
let body: &[u8] = body.borrow();
let mut text = format!(
"HTTP/1.1 {} {}\r\n",
parts.status.as_str(),
parts
.status
.canonical_reason()
.expect("Unsupported HTTP Status"),
);
if !parts.headers.contains_key(http::header::DATE) {
let date = time::strftime("%a, %d %b %Y %H:%M:%S GMT", &time::now_utc()).unwrap();
write!(text, "date: {}\r\n", date).unwrap();
}
if !parts.headers.contains_key(http::header::CONNECTION) {
write!(text, "connection: close\r\n").unwrap();
}
if !parts.headers.contains_key(http::header::CONTENT_LENGTH) {
write!(text, "content-length: {}\r\n", body.len()).unwrap();
}
for (k, v) in parts.headers.iter() {
write!(text, "{}: {}\r\n", k.as_str(), v.to_str().unwrap()).unwrap();
}
write!(text, "\r\n").unwrap();
stream.write(text.as_bytes())?;
stream.write(body)?;
Ok(stream.flush()?)
}
#[test]
fn test_write_response() {
let mut builder = http::response::Builder::new();
builder.status(http::StatusCode::OK);
builder.header(http::header::DATE, "Thu, 01 Jan 1970 00:00:00 GMT");
builder.header(http::header::CONTENT_TYPE, "text/plain".as_bytes());
let mut output = vec![];
let _ = write_response(builder.body("Hello rust".as_bytes()).unwrap(), &mut output).unwrap();
let expected = b"HTTP/1.1 200 OK\r\n\
connection: close\r\n\
content-length: 10\r\n\
date: Thu, 01 Jan 1970 00:00:00 GMT\r\n\
content-type: text/plain\r\n\
\r\n\
Hello rust";
assert_eq!(&expected[..], &output[..]);
}
#[test]
fn test_write_response_no_headers() {
let mut builder = http::response::Builder::new();
builder.header(http::header::DATE, "Thu, 01 Jan 1970 00:00:00 GMT");
builder.status(http::StatusCode::OK);
let mut output = vec![];
let _ = write_response(builder.body("Hello rust".as_bytes()).unwrap(), &mut output).unwrap();
let expected = b"HTTP/1.1 200 OK\r\n\
connection: close\r\n\
content-length: 10\r\n\
date: Thu, 01 Jan 1970 00:00:00 GMT\r\n\
\r\n\
Hello rust";
assert_eq!(&expected[..], &output[..]);
}