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import EventEmitter from 'events';
import { randomBytes } from 'crypto';
import { Duplex, Writable } from 'stream';
import { constants } from 'http2';
function ex_to_err(obj, method, check) {
const orig_method = obj[method];
obj[method] = function (...args) {
if (check && check.call(this)) {
return;
}
try {
orig_method.apply(this, args);
} catch (ex) {
obj.emit('error', ex);
}
};
}
function ignore_reset_code() {
Object.defineProperty(this, 'rstCode', {
get() {
return constants.NGHTTP2_NO_ERROR;
},
configurable: true
});
}
class ServerDuplex extends Duplex {
constructor(stream, options) {
super(options);
this.stream = stream;
this.options = options;
this.need_chunk = false;
this.chunks = [];
this.forward_errors(stream);
}
forward_errors(stream) {
stream.on('error', err => {
this.emit('error', err);
});
}
push_next() {
const { chunk, cb } = this.chunks.shift();
process.nextTick(cb);
return this.push(chunk);
}
sink(stream) {
const ths = this;
const r = new Writable(Object.assign({}, this.options, {
write(chunk, encoding, cb) {
ths.chunks.push({ chunk, cb });
this.emit('written', chunk.length);
if (ths.need_chunk) {
ths._read();
}
}
}));
stream.pipe(r);
return r;
}
drain_and_end() {
while (this.chunks.length > 0) {
this.push_next();
}
this.push(null);
}
_read() {
this.need_chunk = this.chunks.length === 0;
if (!this.need_chunk) {
while (this.chunks.length > 0) {
if (!this.push_next()) {
return;
}
}
this.need_chunk = true;
}
}
_write(chunk, encoding, cb) {
this.stream.write(chunk, encoding, cb);
}
_final(cb) {
if (this.stream._writableState.ending) {
return cb();
}
this.stream.end(cb);
}
_destroy(err, cb) {
this.stream.destroy(err);
cb(err);
}
}
export class Http2DuplexServer extends EventEmitter {
constructor(http2_server, path, options) {
super();
this.http2_server = http2_server;
this.path = path;
this.options = Object.assign({
close_timeout: 1000,
autoDestroy: true
}, options);
this.sessions = new Set();
this.common_headers = {
'Cache-Control': 'max-age=0, no-cache, must-revalidate, proxy-revalidate'
};
this.attach();
}
attach() {
if (!this.session_listener) {
this.session_listener = this.process_session.bind(this);
this.http2_server.on('session', this.session_listener);
}
}
async process_session(session) {
const duplexes = new Map();
this.sessions.add(session);
session.on('close', () => {
this.sessions.delete(session);
for (let duplex of duplexes.values()) {
duplex.push(null);
}
});
session.on('stream', async (stream, headers, flags, raw_headers) => {
await this.process_stream(
stream, headers, flags, raw_headers,
duplexes, { ...this.common_headers });
});
}
own_stream(stream) {
if (!stream.http2_duplex_owned) {
ex_to_err(stream, 'respond', function () {
return this.closed || this.destroyed;
});
ex_to_err(stream, 'close');
stream.on('aborted', ignore_reset_code);
stream.http2_duplex_owned = true;
}
}
async process_stream(stream, headers, flags, raw_headers,
duplexes, response_headers) {
if (headers[':path'] !== this.path) {
this.emit('unhandled_stream', stream, headers, flags, raw_headers,
duplexes, response_headers);
return false;
}
this.own_stream(stream);
const method = headers[':method'];
switch (method) {
case 'GET': {
await this.new_stream(stream, headers, flags, raw_headers,
duplexes, response_headers);
break;
}
case 'POST': {
const id = headers['http2-duplex-id'];
const duplex = duplexes.get(id);
if (!duplex) {
stream.respond({
':status': 404,
...response_headers
}, {
endStream: true
});
break;
}
duplex.forward_errors(stream);
let responded = false;
const respond = () => {
if (!responded) {
responded = true;
ignore_reset_code.call(stream);
stream.respond({
':status': 200,
...response_headers
}, {
endStream: true
});
}
};
const on_close = () => {
respond();
const timeout = setTimeout(() => stream.close(), this.options.close_timeout);
stream.on('close', () => clearTimeout(timeout));
};
duplex.on('close', on_close);
stream.on('close', () => duplex.removeListener('close', on_close));
const end = () => {
duplex.drain_and_end();
duplexes.delete(id);
respond();
};
if (headers['http2-duplex-end'] === 'true') {
end();
if (headers['http2-duplex-destroyed'] === 'true') {
duplex.stream.close();
}
break;
}
// Note: http2 streams always emit 'end' when they close.
// See onStreamClose() and _destroy() in lib/internal/http2/core.js
if (headers['http2-duplex-single'] === 'true') {
duplex.sink(stream).on('finish', end);
break;
}
const content_length = parseInt(headers['content-length'], 10);
if (content_length === 0) {
respond();
} else {
const sink = duplex.sink(stream);
sink.on('finish', respond);
if (content_length > 0) {
let received = 0;
sink.on('written', len => {
received += len;
if (received >= content_length) {
stream.push(null);
}
});
}
}
break;
}
default: {
stream.respond({
':status': 405,
...response_headers
}, {
endStream: true
});
this.emit('warning', new Error(`unknown method: ${method}`));
break;
}
}
return true;
}
async new_stream(stream, headers, flags, raw_headers,
duplexes, response_headers) {
const duplex = new ServerDuplex(stream, this.options);
const id = randomBytes(64).toString('base64');
duplexes.set(id, duplex);
ex_to_err(duplex, 'end');
const on_close = () => {
duplex.end();
};
stream.on('close', on_close);
duplex.on('close', () => {
stream.removeListener('close', on_close);
duplexes.delete(id);
stream.close();
});
stream.respond({
':status': 200,
'http2-duplex-id': id,
'Access-Control-Expose-Headers': 'http2-duplex-id',
'Content-Type': 'application/octet-stream',
...response_headers
});
// Sometimes fetch waits for first byte before resolving
stream.write('a');
this.emit('duplex', duplex, id, headers, flags, raw_headers,
duplexes, response_headers);
return duplex;
}
destroy(obj) {
try {
obj.destroy();
} catch (ex) {
this.emit('warning', ex);
}
}
detach() {
if (this.session_listener) {
this.http2_server.removeListener('session', this.session_listener);
this.session_listener = null;
for (let session of this.sessions) {
session.removeAllListeners('stream');
this.destroy(session);
}
}
}
}
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