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/*
This file is part of GNU Taler
(C) 2023 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import * as net from "node:net";
import * as fs from "node:fs";
import { Logger } from "./logging.js";
import { bytesToString, typedArrayConcat } from "./taler-crypto.js";
import type { RpcConnectArgs, RpcServerArgs } from "./twrpc.js";
interface ReadLinewiseArgs {
onLine(lineData: Uint8Array): void;
sock: net.Socket;
}
const logger = new Logger("twrpc-impl.node.ts");
function readStreamLinewise(args: ReadLinewiseArgs): void {
let chunks: Uint8Array[] = [];
args.sock.on("data", (buf: Uint8Array) => {
// Process all newlines in the newly received buffer
while (1) {
const newlineIdx = buf.indexOf("\n".charCodeAt(0));
if (newlineIdx >= 0) {
let left = buf.subarray(0, newlineIdx + 1);
let right = buf.subarray(newlineIdx + 1);
chunks.push(left);
const line = typedArrayConcat(chunks);
args.onLine(line);
chunks = [];
buf = right;
} else {
chunks.push(buf);
break;
}
}
});
}
export async function connectRpc<T>(args: RpcConnectArgs<T>): Promise<T> {
let sockFilename = args.socketFilename;
return new Promise((resolve, reject) => {
const client = net.createConnection(sockFilename);
client.on("error", (e) => {
reject(e);
});
client.on("connect", () => {
let parsingBody: string | undefined = undefined;
let bodyChunks: string[] = [];
logger.info("connected!");
client.write("%hello-from-client\n");
const res = args.onEstablished({
sendMessage(m) {
client.write("%request\n");
client.write(JSON.stringify(m));
client.write("\n");
client.write("%end\n");
},
close() {
client.destroy();
},
});
readStreamLinewise({
sock: client,
onLine(line) {
const lineStr = bytesToString(line);
// Are we currently parsing the body of a request?
if (!parsingBody) {
const strippedLine = lineStr.trim();
if (strippedLine == "%message") {
parsingBody = "message";
} else if (strippedLine == "%hello-from-server") {
} else if (strippedLine.startsWith("%error:")) {
client.end();
res.onDisconnect();
} else {
logger.warn("got unknown request");
client.write("%error: invalid message\n");
client.end();
}
} else if (parsingBody == "message") {
const strippedLine = lineStr.trim();
if (strippedLine == "%end") {
let req = bodyChunks.join("");
let reqJson: any = undefined;
try {
reqJson = JSON.parse(req);
} catch (e) {
logger.warn("JSON message from server was invalid");
logger.info(`message was: ${req}`);
}
if (reqJson !== undefined) {
res.onMessage(reqJson);
} else {
client.write("%error: invalid JSON");
client.end();
}
bodyChunks = [];
parsingBody = undefined;
} else {
bodyChunks.push(lineStr);
}
} else {
logger.info("invalid parser state");
client.write("%error: internal error\n");
client.end();
}
},
});
client.on("close", () => {
res.onDisconnect();
});
client.on("data", () => {});
resolve(res.result);
});
});
}
export async function runRpcServer(args: RpcServerArgs): Promise<void> {
let sockFilename = args.socketFilename;
try {
fs.unlinkSync(sockFilename);
} catch (e) {
// Do nothing!
}
return new Promise((resolve, reject) => {
const server = net.createServer((sock) => {
// Are we currently parsing the body of a request?
let parsingBody: string | undefined = undefined;
let bodyChunks: string[] = [];
sock.write("%hello-from-server\n");
const handlers = args.onConnect({
sendResponse(message) {
sock.write("%message\n");
sock.write(JSON.stringify(message));
sock.write("\n");
sock.write("%end\n");
},
});
sock.on("error", (err) => {
logger.error(`connection error: ${err}`);
});
function processLine(line: Uint8Array) {
const lineStr = bytesToString(line);
if (!parsingBody) {
const strippedLine = lineStr.trim();
if (strippedLine == "%request") {
parsingBody = "request";
} else if (strippedLine === "%hello-from-client") {
// Nothing to do, ignore hello
} else if (strippedLine.startsWith("%error:")) {
logger.warn("got error from client");
sock.end();
handlers.onDisconnect();
} else {
logger.info("got unknown request");
sock.write("%error: invalid request\n");
sock.end();
}
} else if (parsingBody == "request") {
const strippedLine = lineStr.trim();
if (strippedLine == "%end") {
let req = bodyChunks.join("");
let reqJson: any = undefined;
try {
reqJson = JSON.parse(req);
} catch (e) {
logger.warn("JSON request from client was invalid");
}
if (reqJson !== undefined) {
handlers.onMessage(reqJson);
} else {
sock.write("%error: invalid JSON");
sock.end();
}
bodyChunks = [];
parsingBody = undefined;
} else {
bodyChunks.push(lineStr);
}
} else {
logger.error("invalid parser state");
sock.write("%error: internal error\n");
sock.end();
}
}
readStreamLinewise({
sock,
onLine: processLine,
});
sock.on("close", (hadError: boolean) => {
logger.trace(`connection closed, hadError=${hadError}`);
handlers.onDisconnect();
});
});
server.listen(args.socketFilename);
});
}
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