-
Notifications
You must be signed in to change notification settings - Fork 582
/
http.ts
325 lines (292 loc) · 8.77 KB
/
http.ts
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
import { listen, Conn, toAsyncIterator, Reader, copy } from "deno";
import { BufReader, BufState, BufWriter } from "../io/bufio.ts";
import { TextProtoReader } from "../textproto/mod.ts";
import { STATUS_TEXT } from "./http_status.ts";
import { assert } from "../testing/mod.ts";
interface Deferred {
promise: Promise<{}>;
resolve: () => void;
reject: () => void;
}
function deferred(): Deferred {
let resolve, reject;
const promise = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
return {
promise,
resolve,
reject
};
}
interface ServeEnv {
reqQueue: ServerRequest[];
serveDeferred: Deferred;
}
/** Continuously read more requests from conn until EOF
* Calls maybeHandleReq.
* bufr is empty on a fresh TCP connection.
* Would be passed around and reused for later request on same conn
* TODO: make them async function after this change is done
* https://github.com/tc39/ecma262/pull/1250
* See https://v8.dev/blog/fast-async
*/
function serveConn(env: ServeEnv, conn: Conn, bufr?: BufReader) {
readRequest(conn, bufr).then(maybeHandleReq.bind(null, env, conn));
}
function maybeHandleReq(env: ServeEnv, conn: Conn, maybeReq: any) {
const [req, _err] = maybeReq;
if (_err) {
conn.close(); // assume EOF for now...
return;
}
env.reqQueue.push(req); // push req to queue
env.serveDeferred.resolve(); // signal while loop to process it
}
export async function* serve(addr: string) {
const listener = listen("tcp", addr);
const env: ServeEnv = {
reqQueue: [], // in case multiple promises are ready
serveDeferred: deferred()
};
// Routine that keeps calling accept
const acceptRoutine = () => {
const handleConn = (conn: Conn) => {
serveConn(env, conn); // don't block
scheduleAccept(); // schedule next accept
};
const scheduleAccept = () => {
listener.accept().then(handleConn);
};
scheduleAccept();
};
acceptRoutine();
// Loop hack to allow yield (yield won't work in callbacks)
while (true) {
await env.serveDeferred.promise;
env.serveDeferred = deferred(); // use a new deferred
let queueToProcess = env.reqQueue;
env.reqQueue = [];
for (const result of queueToProcess) {
yield result;
// Continue read more from conn when user is done with the current req
// Moving this here makes it easier to manage
serveConn(env, result.conn, result.r);
}
}
listener.close();
}
export async function listenAndServe(
addr: string,
handler: (req: ServerRequest) => void
) {
const server = serve(addr);
for await (const request of server) {
await handler(request);
}
}
export interface Response {
status?: number;
headers?: Headers;
body?: Uint8Array | Reader;
}
export function setContentLength(r: Response): void {
if (!r.headers) {
r.headers = new Headers();
}
if (r.body) {
if (!r.headers.has("content-length")) {
if (r.body instanceof Uint8Array) {
const bodyLength = r.body.byteLength;
r.headers.append("Content-Length", bodyLength.toString());
} else {
r.headers.append("Transfer-Encoding", "chunked");
}
}
}
}
export class ServerRequest {
url: string;
method: string;
proto: string;
headers: Headers;
conn: Conn;
r: BufReader;
w: BufWriter;
public async *bodyStream() {
if (this.headers.has("content-length")) {
const len = +this.headers.get("content-length");
if (Number.isNaN(len)) {
return new Uint8Array(0);
}
let buf = new Uint8Array(1024);
let rr = await this.r.read(buf);
let nread = rr.nread;
while (!rr.eof && nread < len) {
yield buf.subarray(0, rr.nread);
buf = new Uint8Array(1024);
rr = await this.r.read(buf);
nread += rr.nread;
}
yield buf.subarray(0, rr.nread);
} else {
if (this.headers.has("transfer-encoding")) {
const transferEncodings = this.headers
.get("transfer-encoding")
.split(",")
.map(e => e.trim().toLowerCase());
if (transferEncodings.includes("chunked")) {
// Based on https://tools.ietf.org/html/rfc2616#section-19.4.6
const tp = new TextProtoReader(this.r);
let [line, _] = await tp.readLine();
// TODO: handle chunk extension
let [chunkSizeString, optExt] = line.split(";");
let chunkSize = parseInt(chunkSizeString, 16);
if (Number.isNaN(chunkSize) || chunkSize < 0) {
throw new Error("Invalid chunk size");
}
while (chunkSize > 0) {
let data = new Uint8Array(chunkSize);
let [nread, err] = await this.r.readFull(data);
if (nread !== chunkSize) {
throw new Error("Chunk data does not match size");
}
yield data;
await this.r.readLine(); // Consume \r\n
[line, _] = await tp.readLine();
chunkSize = parseInt(line, 16);
}
const [entityHeaders, err] = await tp.readMIMEHeader();
if (!err) {
for (let [k, v] of entityHeaders) {
this.headers.set(k, v);
}
}
/* Pseudo code from https://tools.ietf.org/html/rfc2616#section-19.4.6
length := 0
read chunk-size, chunk-extension (if any) and CRLF
while (chunk-size > 0) {
read chunk-data and CRLF
append chunk-data to entity-body
length := length + chunk-size
read chunk-size and CRLF
}
read entity-header
while (entity-header not empty) {
append entity-header to existing header fields
read entity-header
}
Content-Length := length
Remove "chunked" from Transfer-Encoding
*/
return; // Must return here to avoid fall through
}
// TODO: handle other transfer-encoding types
}
// Otherwise...
yield new Uint8Array(0);
}
}
// Read the body of the request into a single Uint8Array
public async body(): Promise<Uint8Array> {
return readAllIterator(this.bodyStream());
}
private async _streamBody(body: Reader, bodyLength: number) {
const n = await copy(this.w, body);
assert(n == bodyLength);
}
private async _streamChunkedBody(body: Reader) {
const encoder = new TextEncoder();
for await (const chunk of toAsyncIterator(body)) {
const start = encoder.encode(`${chunk.byteLength.toString(16)}\r\n`);
const end = encoder.encode("\r\n");
await this.w.write(start);
await this.w.write(chunk);
await this.w.write(end);
}
const endChunk = encoder.encode("0\r\n\r\n");
await this.w.write(endChunk);
}
async respond(r: Response): Promise<void> {
const protoMajor = 1;
const protoMinor = 1;
const statusCode = r.status || 200;
const statusText = STATUS_TEXT.get(statusCode);
if (!statusText) {
throw Error("bad status code");
}
let out = `HTTP/${protoMajor}.${protoMinor} ${statusCode} ${statusText}\r\n`;
setContentLength(r);
if (r.headers) {
for (const [key, value] of r.headers) {
out += `${key}: ${value}\r\n`;
}
}
out += "\r\n";
const header = new TextEncoder().encode(out);
let n = await this.w.write(header);
assert(header.byteLength == n);
if (r.body) {
if (r.body instanceof Uint8Array) {
n = await this.w.write(r.body);
assert(r.body.byteLength == n);
} else {
if (r.headers.has("content-length")) {
await this._streamBody(
r.body,
parseInt(r.headers.get("content-length"))
);
} else {
await this._streamChunkedBody(r.body);
}
}
}
await this.w.flush();
}
}
async function readRequest(
c: Conn,
bufr?: BufReader
): Promise<[ServerRequest, BufState]> {
if (!bufr) {
bufr = new BufReader(c);
}
const bufw = new BufWriter(c);
const req = new ServerRequest();
req.conn = c;
req.r = bufr!;
req.w = bufw;
const tp = new TextProtoReader(bufr!);
let s: string;
let err: BufState;
// First line: GET /index.html HTTP/1.0
[s, err] = await tp.readLine();
if (err) {
return [null, err];
}
[req.method, req.url, req.proto] = s.split(" ", 3);
[req.headers, err] = await tp.readMIMEHeader();
return [req, err];
}
async function readAllIterator(
it: AsyncIterableIterator<Uint8Array>
): Promise<Uint8Array> {
const chunks = [];
let len = 0;
for await (const chunk of it) {
chunks.push(chunk);
len += chunk.length;
}
if (chunks.length === 0) {
// No need for copy
return chunks[0];
}
const collected = new Uint8Array(len);
let offset = 0;
for (let chunk of chunks) {
collected.set(chunk, offset);
offset += chunk.length;
}
return collected;
}