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import type {AdapterContext} from '@feasibleone/blong/types';
import {type Server, Socket} from 'net';
import createReconnect from 'reconnect-core';
import bitSyntax from 'ut-bitsyntax';
import tls from '../../tls.ts';
type CodecInstance = {
encode: (...args: unknown[]) => unknown;
decode: (...args: unknown[]) => unknown;
frameReducer?: (...args: unknown[]) => unknown;
frameBuilder?: (...args: unknown[]) => unknown;
};
export interface IConfig {
tls?: object | null;
client?: {connect: (...params: unknown[]) => Socket};
host?: string;
port?: number | null;
localPort?: number | null;
listen?: boolean;
connection?: object;
maxReceiveBuffer?: number;
maxConnections?: number;
connectionDropPolicy?: string;
socketTimeOut?: number;
format?: {
size?: number | null;
sizeAdjust?: number;
prefix?: string;
codec?: {
new (config: object): CodecInstance;
encode: (data: object[], $meta: unknown, context: unknown, log: unknown) => string | Buffer;
decode: (buff: string | Buffer, $meta: unknown, context: unknown, log: unknown) => object[];
} | null;
id?: unknown;
} | null;
}
export default adapter<IConfig>(api => {
let conCount = 0;
const streams: Socket[] = [];
const onError = (type: string) =>
function (this: Adapter<IConfig, AdapterContext>, err: Error): void {
if (this.log?.error) {
const error = new Error(`TCP ${type}`) as ITypedError;
error.cause = err;
error.type = `portTCP.${type}`;
this.log.error(error);
}
};
function connect(this: Adapter<IConfig, AdapterContext>, stream: Socket): void {
conCount += 1;
if (conCount > 0x1fffffffffffff) {
conCount = 1;
}
streams.push(stream);
const maxConnections = this.config.maxConnections ?? 1000;
const connectionDropPolicy = this.config.connectionDropPolicy ?? 'oldest';
if (streams.length > maxConnections) {
this.log?.warn?.(
`Connection limit exceeded (max ${maxConnections}). Closing ${connectionDropPolicy} connection.`,
);
switch (connectionDropPolicy) {
case 'oldest':
streams.shift()!.destroy();
break;
case 'newest':
streams.pop()!.destroy();
return;
}
}
stream.on('close', () => {
const index = streams.indexOf(stream);
if (index !== -1) {
streams.splice(index, 1);
}
});
const context = {
conId: undefined as number | undefined,
trace: 0,
callbacks: {},
created: new Date(),
localAddress: stream.localAddress,
localPort: stream.localPort,
remoteAddress: stream.remoteAddress,
remotePort: stream.remotePort,
};
if (this.config.listen) {
context.conId = conCount;
}
this.connect!(stream, context);
}
let server: Server | null = null;
let reconnect: ReturnType<ReturnType<typeof createReconnect>> | null = null;
let codec: CodecInstance | null = null;
return {
activation: {
default: {
logLevel: 'debug',
type: 'tcp',
host: '127.0.0.1',
port: null,
listen: false,
tls: null,
localPort: null,
socketTimeOut: 60000 * 10,
maxConnections: 1000,
connectionDropPolicy: 'oldest',
format: {
size: null,
codec: null,
id: null,
sizeAdjust: 0,
prefix: '',
},
},
},
async start(this: Adapter<IConfig, AdapterContext>) {
const result = await super.start();
const format = this.config.format;
if (format?.codec) {
const Codec = format.codec;
codec = new Codec({...(api.utError as object), ...format});
this.encode = (...params) => codec!.encode(...params) as Promise<string | Buffer>;
this.decode = (...params) => codec!.decode(...params) as Promise<object[]>;
} else codec = null;
if (codec && (codec as {frameReducer?: unknown}).frameReducer && (codec as {frameBuilder?: unknown}).frameBuilder) {
this.pack = (codec as {frameBuilder: unknown}).frameBuilder as Adapter<IConfig, AdapterContext>['pack'];
this.unpack = (codec as {frameReducer: unknown}).frameReducer as Adapter<IConfig, AdapterContext>['unpack'];
} else if (format?.size) {
const {size, sizeAdjust = 0, prefix = ''} = format;
this.pack = bitSyntax.builder(
`${prefix}${prefix && ', '}size:${size}, data:size/binary`,
) as Adapter<IConfig, AdapterContext>['pack'];
if (sizeAdjust || this.config.maxReceiveBuffer) {
this.unpackSize = bitSyntax.matcher(
`${prefix}${prefix && ', '}size:${size}, data/binary`,
) as Adapter<IConfig, AdapterContext>['unpackSize'];
this.unpack = bitSyntax.matcher('data:size/binary, rest/binary') as Adapter<IConfig, AdapterContext>['unpack'];
} else {
this.unpack = bitSyntax.matcher(
`${prefix}${prefix && ', '}size:${size}, data:size/binary, rest/binary`,
) as Adapter<IConfig, AdapterContext>['unpack'];
}
}
if (this.config.listen) {
server = this.config.tls
? (await import('node:tls')).createServer(
tls(this.config as Parameters<typeof tls>[0], false) as Parameters<(typeof import('node:tls'))['createServer']>[0],
connect.bind(this),
)
: (await import('node:net')).createServer(connect.bind(this));
server.on('error', onError('server').bind(this)).listen(this.config.port ?? undefined);
} else {
const client = (this.config.client ||
(await (this.config.tls ? import('node:tls') : import('node:net')))) as {connect: (...args: unknown[]) => unknown};
reconnect = createReconnect((...args: unknown[]) => client.connect(...args))(
connect.bind(this) as (...args: unknown[]) => void,
)
.on('error', onError('client').bind(this) as (...args: unknown[]) => void)
.connect({
rejectUnauthorized: false,
...tls(this.config as Parameters<typeof tls>[0], false),
...Object.fromEntries(
[
['host', this.config.host],
['port', this.config.port],
['localPort', this.config.localPort],
].filter(([, value]) => value != null),
),
});
}
return result;
},
async stop(...params: unknown[]) {
let result;
try {
if (reconnect) {
reconnect.removeAllListeners();
const e = reconnect.disconnect();
(e as {_connection?: {unref(): void}})?._connection?.unref();
reconnect = null;
}
if (server) {
server.close();
server.unref();
server = null;
}
} finally {
result = await super.stop(...params);
}
return result;
},
};
});
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