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/*
* Copyright (C) 2024-present Puter Technologies Inc.
*
* This file is part of Puter.
*
* Puter is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
const lib = {};
// SO: 40031688
lib.buf2hex = (buffer) => { // buffer is an ArrayBuffer
return [...new Uint8Array(buffer)]
.map(x => x.toString(16).padStart(2, '0'))
.join('');
};
// Tiny inline little-endian integer library
lib.get_int = (n_bytes, array8, signed = false) => {
return (v => signed ? v : v >>> 0)(
array8.slice(0, n_bytes).reduce((v, e, i) => v |= e << 8 * i, 0));
};
lib.to_int = (n_bytes, num) => {
return (new Uint8Array()).map((_, i) => (num >> 8 * i) & 0xFF);
};
class ATStream {
constructor ({ delegate, acc, transform, observe }) {
this.delegate = delegate;
if ( acc ) this.acc = acc;
if ( transform ) this.transform = transform;
if ( observe ) this.observe = observe;
this.state = {};
this.carry = [];
}
[Symbol.asyncIterator] () {
return this;
}
async next_value_ () {
if ( this.carry.length > 0 ) {
return {
value: this.carry.shift(),
done: false,
};
}
return await this.delegate.next();
}
async acc ({ value }) {
return value;
}
async next_ () {
for ( ;; ) {
const ret = await this.next_value_();
if ( ret.done ) return ret;
const v = await this.acc({
state: this.state,
value: ret.value,
carry: v => this.carry.push(v),
});
if ( this.carry.length > 0 && v === undefined ) {
throw new Error('no value, but carry value exists');
}
if ( v === undefined ) continue;
// We have a value, clear the state!
this.state = {};
if ( this.transform ) {
const new_value = await this.transform({ value: ret.value });
return { ...ret, value: new_value };
}
return { ...ret, value: v };
}
}
async next () {
const ret = await this.next_();
if ( this.observe && !ret.done ) {
this.observe(ret);
}
return ret;
}
async enqueue_ (v) {
this.queue.push(v);
}
}
const NewCallbackByteStream = () => {
let listener;
let queue = [];
const NOOP = () => {
};
let signal = NOOP;
(async () => {
for ( ;; ) {
const v = await new Promise((rslv, rjct) => {
listener = rslv;
});
queue.push(v);
signal();
}
})();
const stream = {
[Symbol.asyncIterator] () {
return this;
},
async next () {
if ( queue.length > 0 ) {
return {
value: queue.shift(),
done: false,
};
}
await new Promise(rslv => {
signal = rslv;
});
signal = NOOP;
const v = queue.shift();
return { value: v, done: false };
},
};
stream.listener = data => {
listener(data);
};
return stream;
};
const NewVirtioFrameStream = byteStream => {
return new ATStream({
delegate: byteStream,
async acc ({ value, carry }) {
if ( ! this.state.buffer ) {
if ( this.state.hold ) {
const old_val = value;
let size = this.state.hold.length + value.length;
value = new Uint8Array(size);
value.set(this.state.hold, 0);
value.set(old_val, this.state.hold.length);
}
if ( value.length < 4 ) {
this.state.hold = value;
return undefined;
}
const size = lib.get_int(4, value);
// 512MiB limit in case of attempted abuse or a bug
// (assuming this won't happen under normal conditions)
if ( size > 512 * (1024 ** 2) ) {
throw new Error(`Way too much data! (${size} bytes)`);
}
value = value.slice(4);
this.state.buffer = new Uint8Array(size);
this.state.index = 0;
}
const needed = this.state.buffer.length - this.state.index;
if ( value.length > needed ) {
const remaining = value.slice(needed);
console.log('we got more bytes than we needed',
needed,
remaining,
value.length,
this.state.buffer.length,
this.state.index);
carry(remaining);
}
const amount = Math.min(value.length, needed);
const added = value.slice(0, amount);
this.state.buffer.set(added, this.state.index);
this.state.index += amount;
if ( this.state.index > this.state.buffer.length ) {
throw new Error('WUT');
}
if ( this.state.index == this.state.buffer.length ) {
return this.state.buffer;
}
},
});
};
const wisp_types = [
{
id: 3,
label: 'CONTINUE',
describe: ({ payload }) => {
return `buffer: ${lib.get_int(4, payload)}B`;
},
getAttributes ({ payload }) {
return {
buffer_size: lib.get_int(4, payload),
};
},
},
{
id: 5,
label: 'INFO',
describe: ({ payload }) => {
return `v${payload[0]}.${payload[1]} ${
lib.buf2hex(payload.slice(2))}`;
},
getAttributes ({ payload }) {
return {
version_major: payload[0],
version_minor: payload[1],
extensions: payload.slice(2),
};
},
},
];
class WispPacket {
static SEND = Symbol('SEND');
static RECV = Symbol('RECV');
constructor ({ data, direction, extra }) {
this.direction = direction;
this.data_ = data;
this.extra = extra ?? {};
this.types_ = {
1: { label: 'CONNECT' },
2: { label: 'DATA' },
4: { label: 'CLOSE' },
};
for ( const item of wisp_types ) {
this.types_[item.id] = item;
}
}
get type () {
const i_ = this.data_[0];
return this.types_[i_];
}
get attributes () {
if ( ! this.type.getAttributes ) return {};
const attrs = {};
Object.assign(attrs, this.type.getAttributes({
payload: this.data_.slice(5),
}));
Object.assign(attrs, this.extra);
return attrs;
}
toVirtioFrame () {
const arry = new Uint8Array(this.data_.length + 4);
arry.set(lib.to_int(4, this.data_.length), 0);
arry.set(this.data_, 4);
return arry;
}
describe () {
return `${this.type.label }(${
this.type.describe?.({
payload: this.data_.slice(5),
}) ?? '?' })`;
}
log () {
const arrow =
this.direction === this.constructor.SEND ? '->' :
this.direction === this.constructor.RECV ? '<-' :
'<>' ;
console.groupCollapsed(`WISP ${arrow} ${this.describe()}`);
const attrs = this.attributes;
for ( const k in attrs ) {
console.log(k, attrs[k]);
}
console.groupEnd();
}
reflect () {
const reflected = new WispPacket({
data: this.data_,
direction:
this.direction === this.constructor.SEND ?
this.constructor.RECV :
this.direction === this.constructor.RECV ?
this.constructor.SEND :
undefined,
extra: {
reflectedFrom: this,
},
});
return reflected;
}
}
for ( const item of wisp_types ) {
WispPacket[item.label] = item;
}
const NewWispPacketStream = frameStream => {
return new ATStream({
delegate: frameStream,
transform ({ value }) {
return new WispPacket({
data: value,
direction: WispPacket.RECV,
});
},
observe ({ value }) {
value.log();
},
});
};
class WispClient {
constructor ({
packetStream,
sendFn,
}) {
this.packetStream = packetStream;
this.sendFn = sendFn;
}
send (packet) {
packet.log();
this.sendFn(packet);
}
}
module.exports = {
NewVirtioFrameStream,
NewWispPacketStream,
WispPacket,
};
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