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import type * as stream from 'node:stream';
import {Nfsv4Decoder} from '../Nfsv4Decoder';
import {Nfsv4FullEncoder} from '../Nfsv4FullEncoder';
import {RmRecordDecoder} from '../../../rm';
import {
RpcAcceptedReplyMessage,
type RpcMessage,
RpcMessageDecoder,
RpcOpaqueAuth,
RpcRejectedReplyMessage,
} from '../../../rpc';
import {EMPTY_READER, Nfsv4Proc, Nfsv4Const} from '../constants';
import {Nfsv4CompoundRequest, type Nfsv4CompoundResponse, type Nfsv4Request} from '../messages';
import type {Nfsv4Client} from './types';
export interface Nfsv4TcpClientOpts {
host?: string;
port?: number;
timeout?: number;
debug?: boolean;
logger?: Pick<typeof console, 'log' | 'error'>;
}
interface PendingRequest {
resolve: (response: Nfsv4CompoundResponse) => void;
reject: (error: Error) => void;
timeout?: NodeJS.Timeout;
}
export class Nfsv4TcpClient implements Nfsv4Client {
public static fromDuplex(duplex: stream.Duplex, opts: Nfsv4TcpClientOpts = {}): Nfsv4TcpClient {
const client = new Nfsv4TcpClient(opts);
client.setSocket(duplex);
return client;
}
public readonly host: string;
public readonly port: number;
public readonly timeout: number;
public debug: boolean;
public logger: Pick<typeof console, 'log' | 'error'>;
private socket: stream.Duplex | null = null;
private connected = false;
private connecting = false;
private xid = 0;
private pendingRequests = new Map<number, PendingRequest>();
protected rmDecoder: RmRecordDecoder;
protected rpcDecoder: RpcMessageDecoder;
private readonly nfsDecoder: Nfsv4Decoder;
private readonly nfsEncoder: Nfsv4FullEncoder;
constructor(opts: Nfsv4TcpClientOpts = {}) {
this.host = opts.host || '127.0.0.1';
this.port = opts.port || 2049;
this.timeout = opts.timeout || 30000;
this.debug = !!opts.debug;
this.logger = opts.logger || console;
this.rmDecoder = new RmRecordDecoder();
this.rpcDecoder = new RpcMessageDecoder();
this.nfsDecoder = new Nfsv4Decoder();
this.nfsEncoder = new Nfsv4FullEncoder();
}
private nextXid(): number {
this.xid = (this.xid + 1) >>> 0;
Iif (this.xid === 0) this.xid = 1;
return this.xid;
}
public async connect(): Promise<void> {
Iif (this.connected) return;
Iif (this.connecting) throw new Error('Connection already in progress');
return new Promise((resolve, reject) => {
this.connecting = true;
const onError = (err: Error) => {
this.connecting = false;
this.connected = false;
Iif (this.debug) this.logger.error('Socket error:', err);
reject(err);
};
const socket = net.connect({host: this.host, port: this.port}, () => {
Iif (this.debug) this.logger.log(`Connected to NFSv4 server at ${this.host}:${this.port}`);
socket.removeListener('error', onError);
resolve();
this.setSocket(socket);
});
socket.once('error', onError);
});
}
protected setSocket(socket: stream.Duplex): void {
socket.on('data', this.onData.bind(this));
socket.on('close', this.onClose.bind(this));
socket.on('error', (err: Error) => {
this.connecting = false;
this.connected = false;
Iif (this.debug) this.logger.error('Socket error:', err);
});
this.connected = true;
this.connecting = false;
this.socket = socket;
}
private onData(data: Uint8Array): void {
const {rmDecoder, rpcDecoder} = this;
rmDecoder.push(data);
let record = rmDecoder.readRecord();
while (record) {
if (record.size()) {
const rpcMessage = rpcDecoder.decodeMessage(record);
if (rpcMessage) this.onRpcMessage(rpcMessage);
else IEif (this.debug) this.logger.error('Failed to decode RPC message');
}
record = rmDecoder.readRecord();
}
}
private onRpcMessage(msg: RpcMessage): void {
if (msg instanceof RpcAcceptedReplyMessage) {
const pending = this.pendingRequests.get(msg.xid);
Iif (!pending) {
Iif (this.debug) this.logger.error(`No pending request for XID ${msg.xid}`);
return;
}
this.pendingRequests.delete(msg.xid);
if (pending.timeout) clearTimeout(pending.timeout);
Iif (msg.stat !== 0) {
pending.reject(new Error(`RPC accepted reply error: stat=${msg.stat}`));
return;
}
if (!msg.results) {
// NULL procedure has no results, check if resolve expects no arguments
if (pending.resolve.length === 0) {
(pending.resolve as any)();
return;
}
pending.reject(new Error('No results in accepted reply'));
return;
}
const response = this.nfsDecoder.decodeCompoundResponse(msg.results);
Iif (!response) {
pending.reject(new Error('Failed to decode COMPOUND response'));
return;
}
pending.resolve(response);
} else Eif (msg instanceof RpcRejectedReplyMessage) {
const pending = this.pendingRequests.get(msg.xid);
Iif (!pending) {
Iif (this.debug) this.logger.error(`No pending request for XID ${msg.xid}`);
return;
}
this.pendingRequests.delete(msg.xid);
Iif (pending.timeout) clearTimeout(pending.timeout);
pending.reject(new Error(`RPC rejected reply: stat=${msg.stat}`));
} else {
Iif (this.debug) this.logger.error('Unexpected RPC message type:', msg);
}
}
private onClose(): void {
this.connected = false;
this.connecting = false;
Iif (this.debug) this.logger.log('Connection closed');
const error = new Error('Connection closed');
this.pendingRequests.forEach((pending, xid) => {
if (pending.timeout) clearTimeout(pending.timeout);
pending.reject(error);
});
this.pendingRequests.clear();
}
public async compound(request: Nfsv4CompoundRequest): Promise<Nfsv4CompoundResponse>;
public async compound(
operations: Nfsv4Request[],
tag?: string,
minorversion?: number,
): Promise<Nfsv4CompoundResponse>;
public async compound(
requestOrOps: Nfsv4CompoundRequest | Nfsv4Request[],
tag: string = '',
minorversion: number = 0,
): Promise<Nfsv4CompoundResponse> {
Iif (!this.connected) throw new Error('Not connected');
const request =
requestOrOps instanceof Nfsv4CompoundRequest
? requestOrOps
: new Nfsv4CompoundRequest(tag, minorversion, requestOrOps);
const xid = this.nextXid();
const cred = new RpcOpaqueAuth(0, EMPTY_READER);
const verf = new RpcOpaqueAuth(0, EMPTY_READER);
const encoded = this.nfsEncoder.encodeCall(xid, Nfsv4Proc.COMPOUND, cred, verf, request);
return new Promise((resolve, reject) => {
const timeout = setTimeout(() => {
this.pendingRequests.delete(xid);
reject(new Error(`Request timeout (XID ${xid})`));
}, this.timeout);
this.pendingRequests.set(xid, {resolve, reject, timeout});
this.socket!.write(encoded);
Iif (this.debug) {
this.logger.log(`Sent COMPOUND request (XID ${xid}): ${request.argarray.length} operations`);
}
});
}
public async null(): Promise<void> {
Iif (!this.connected) throw new Error('Not connected');
const xid = this.nextXid();
const cred = new RpcOpaqueAuth(0, EMPTY_READER);
const verf = new RpcOpaqueAuth(0, EMPTY_READER);
const writer = this.nfsEncoder.writer;
const rmEncoder = this.nfsEncoder.rmEncoder;
const rpcEncoder = this.nfsEncoder.rpcEncoder;
const state = rmEncoder.startRecord();
rpcEncoder.writeCall(xid, Nfsv4Const.PROGRAM, Nfsv4Const.VERSION, Nfsv4Proc.NULL, cred, verf);
rmEncoder.endRecord(state);
const encoded = writer.flush();
return new Promise((resolve, reject) => {
const timeout = setTimeout(() => {
this.pendingRequests.delete(xid);
reject(new Error(`NULL request timeout (XID ${xid})`));
}, this.timeout);
this.pendingRequests.set(xid, {
resolve: () => resolve(),
reject,
timeout,
} as any);
this.socket!.write(encoded);
Iif (this.debug) this.logger.log(`Sent NULL request (XID ${xid})`);
});
}
public close(): void {
if (this.socket) {
this.socket.end();
this.socket = null;
}
this.connected = false;
this.connecting = false;
}
public isConnected(): boolean {
return this.connected;
}
}
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