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import {Internal, type ILog, type IManifest, type IMeta, type IRpcServer} from '@feasibleone/blong/types';
import fastify, {type FastifyReply, type FastifyRequest, type RouteOptions} from 'fastify';
import type {IResolution} from './Resolution.ts';
interface IConfig {
port: number;
host: string;
logLevel: Parameters<ILog['logger']>[0];
}
export default class RpcServer extends Internal implements IRpcServer {
#config: IConfig = {
port: 8091,
host: '0.0.0.0',
logLevel: 'info',
};
// #dapr: DaprServer;
#server: ReturnType<typeof fastify>;
#routes: RouteOptions[] = [];
#resolution: IResolution;
#handlers: Map<string, {handle: RouteOptions['handler']}> = new Map();
#attachCheckpoint?: (meta: IMeta) => void;
#manifest: IManifest | undefined;
public constructor(
config: IConfig,
{log, resolution, manifest}: {log: ILog; resolution: IResolution; manifest?: IManifest},
) {
// https://docs.dapr.io/developing-applications/sdks/js/js-server/
// this.#dapr = new DaprServer({
// serverHost: '127.0.0.1',
// serverPort: '50051',
// communicationProtocol: CommunicationProtocolEnum.HTTP,
// clientOptions: {
// daprHost: '127.0.0.1',
// daprPort: '3500'
// }
// });
super({log});
this.merge(this.#config, config);
this.#resolution = resolution;
this.#manifest = manifest;
this.#server = fastify({
loggerInstance: log?.child({name: 'rpc'}, {level: this.#config.logLevel}),
});
}
private _register(
namespace: string,
name: string,
callback: () => unknown,
object: object,
_pkg: unknown,
): void {
const url = `/rpc/${namespace}/${name.split('.').join('/')}`;
const attachCheckpoint = this.#attachCheckpoint;
async function handle(request: FastifyRequest, _reply: FastifyReply): Promise<object> {
const {id, method, params} = request.body as {
id: string;
method: string;
params: object[];
};
const meta = params.pop();
const newMeta = {
...meta,
method,
// forward: forward(request.headers),
opcode: method.split('.').pop(),
};
attachCheckpoint?.(newMeta as IMeta);
const result = await (callback as (...args: unknown[]) => Promise<unknown>).apply(
object,
[...params, newMeta],
);
return {
jsonrpc: '2.0',
id,
result,
...((newMeta as {checkpoints?: unknown[]}).checkpoints?.length && {
checkpoints: (newMeta as {checkpoints?: unknown[]}).checkpoints,
}),
};
}
const prevHandler = this.#handlers.get(url);
if (prevHandler) prevHandler.handle = handle;
else {
const handler = {handle};
this.#handlers.set(url, handler);
this.#routes.push({
method: 'post',
url,
handler: (request, reply) => handler.handle(request, reply),
});
}
this.#resolution?.announce(
'rpc-' + name.split('.')[0].replace(/\//g, '-'),
this.#config.port,
);
}
public register(
methods: object,
namespace: string,
reply: boolean,
pkg: {version: string},
): void {
if (methods instanceof Array) {
methods.forEach(fn => {
if (fn instanceof Function && fn.name) {
this._register(namespace, fn.name, fn, null as unknown as object, pkg);
}
});
} else {
Object.keys(methods).forEach(key => {
if ((methods as Record<string, unknown>)[key] instanceof Function) {
this._register(
namespace,
key,
(methods as Record<string, unknown>)[key] as () => unknown,
methods,
pkg,
);
}
});
}
}
public setAttachCheckpoint(fn: ((meta: IMeta) => void) | undefined): void {
this.#attachCheckpoint = fn;
}
private _unregister(namespace: string, name: string): void {
const url = `/rpc/${namespace}/${name.split('.').join('/')}`;
const prevHandler = this.#handlers.get(url);
if (prevHandler) {
prevHandler.handle = (request, reply) => {
return reply.code(404).type('text/plain').send('route removed');
};
}
}
public unregister(methods: string[], namespace: string): void {
methods.forEach(fn => this._unregister(namespace, fn));
}
public async start(): Promise<IRpcServer> {
this.#routes.forEach(route => this.#server.route(route));
await this.#server.listen({
port: this.#config.port,
host: this.#config.host,
});
// Publish the effective RPC port to the manifest.
// The manifest proxy automatically resolves any pending deferred.
const address = this.#server.server.address();
if (this.#manifest && address && typeof address === 'object') {
this.#manifest.rpcPort = address.port;
}
return this;
}
public async stop(): Promise<IRpcServer> {
await this.#server.close();
return this;
}
public info(): object {
return {
address: this.#server.server.address(),
};
}
}
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