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Stevan Freeborn
2026-08-12 18:22:42 -05:00
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.gitignore
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node_modules/
config.json
LICENSE.md
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Copyright (c) 2026 Stevan Freeborn
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
README.md
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# sftp_testing
A scratch project for troubleshooting and debugging the behavior of parallel SSH/SFTP connections to target machines using the `ssh2-sftp-client` npm library.
## What it does
`index.ts` spawns 6 worker threads concurrently. Each worker connects to an SFTP server, uploads `test.txt` as `<runIndex>-test.txt`, then deletes the remote file. The goal is to reproduce and inspect issues that arise when many connections are opened against a target host at the same time.
## Setup
```bash
npm install
cp config.example.json config.json
```
Then fill in `config.json` with real credentials. Multiple profiles are supported; pass a profile name as the first CLI argument (defaults to `default`):
```bash
npx tsx index.ts
npx tsx index.ts ftp.stevanfreeborn.com
```
## Notes
- Connection settings (host, port, username, password) are loaded from `config.json`.
- Each worker runs the same upload/delete sequence independently against the same target.
- On success, the main thread prints: `All workers completed execution successfully.`
config.example.json
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{
"profiles": {
"freeborn.cloud": {
"host": "ssh.freeborn.cloud",
"port": 22,
"username": "your-username",
"password": "your-password"
},
"ftp.stevanfreeborn.com": {
"host": "ftp.stevanfreeborn.com",
"port": 22,
"username": "your-username",
"password": "your-password"
},
"default": {
"host": "64.181.222.218",
"port": 22,
"username": "your-username",
"password": "your-password"
}
}
}
index.ts
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import Client from "ssh2-sftp-client";
import { readFileSync } from "node:fs";
import process from "node:process";
import { Worker, isMainThread, workerData } from "node:worker_threads";
type Config = {
host: string;
port: number;
username: string;
password: string;
};
type Profiles = Record<string, Config>;
type ConfigFile = {
profiles: Profiles;
};
const CONFIG_PATH = new URL("./config.json", import.meta.url);
function loadConfig(configArg?: string): Config {
let configFile: ConfigFile;
try {
configFile = JSON.parse(readFileSync(CONFIG_PATH, "utf-8")) as ConfigFile;
} catch (error) {
throw new Error(
`Could not read config file at ${CONFIG_PATH.href}. Copy config.example.json to config.json and fill in your credentials.`,
);
}
const profiles = configFile.profiles ?? {};
const profileName = configArg ?? "default";
const config = profiles[profileName];
if (!config) {
throw new Error(
`Unknown profile "${profileName}". Available profiles: ${Object.keys(profiles).join(", ")}`,
);
}
if (!config.host || !config.username || !config.password) {
throw new Error(
`Profile "${profileName}" is missing host, username, or password in config.json.`,
);
}
return { ...config, port: Number(config.port) || 22 };
}
class SftpService {
private readonly config: Config;
constructor(config: Config) {
this.config = config;
}
async uploadFile(sourcePath: string, remotePath: string) {
const client = new Client();
try {
await client.connect(this.config);
await client.put(sourcePath, remotePath);
} catch (error) {
if (error instanceof Error) {
console.error(error.message);
}
} finally {
await client.end();
}
}
async deleteFile(remotePath: string) {
const client = new Client();
try {
await client.connect(this.config);
await client.delete(remotePath);
} catch (error) {
if (error instanceof Error) {
console.error(error.message);
}
} finally {
await client.end();
}
}
}
function runWorker(runIndex: number, configArg?: string): Promise<void> {
return new Promise((resolve, reject) => {
const worker = new Worker(new URL(import.meta.url), {
workerData: { runIndex, configArg },
});
worker.on("exit", (code) => {
if (code !== 0) {
reject(new Error(`Worker ${runIndex} exited with code ${code}`));
} else {
resolve();
}
});
worker.on("error", (err) => reject(err));
});
}
async function executeIteration(runIndex: number, configArg?: string) {
const sftp = new SftpService(loadConfig(configArg));
const remotePath = `./${runIndex}-test.txt`;
const sourcePath = "./test.txt";
console.log(`[Worker ${runIndex}] Starting run number ${runIndex}`);
console.log(`[Worker ${runIndex}] Uploading file...`);
await sftp.uploadFile(sourcePath, remotePath);
console.log(`[Worker ${runIndex}] File uploaded`);
console.log(`[Worker ${runIndex}] Deleting file...`);
await sftp.deleteFile(remotePath);
console.log(`[Worker ${runIndex}] File deleted`);
}
async function main() {
if (isMainThread) {
const configArg = process.argv[2];
const TOTAL_RUNS = 6;
console.log(`[Main] Spawning ${TOTAL_RUNS} parallel workers...`);
const workerPromises: Promise<void>[] = [];
for (let i = 0; i < TOTAL_RUNS; i++) {
workerPromises.push(runWorker(i, configArg));
}
await Promise.all(workerPromises);
console.log("[Main] All workers completed execution successfully.");
} else {
const { runIndex, configArg } = workerData;
await executeIteration(runIndex, configArg);
}
}
await main();
package-lock.json
Generated
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package.json
+14
View File
@@ -0,0 +1,14 @@
{
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"version": "1.0.0",
"main": "index.ts",
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"devDependencies": {
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}
}
test.txt
+1
View File
@@ -0,0 +1 @@
This is a test file for upload