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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | 9x 9x 9x 4x 4x 4x 8x 5x 4x 4x 5x 5x 5x 1x 5x 4x 4x | /**
* Port Allocator
*
* Finds the next available port for a preview deployment.
* Queries running preview containers and performs a bind test.
*/
import { createServer } from 'node:net';
import { getPreviewPorts } from './docker-client.js';
import { createModuleLogger } from '../logger/index.js';
const log = createModuleLogger('preview:port');
/** Starting port for preview deployments */
const BASE_PORT = 9100;
/** Maximum port to try before giving up */
const MAX_PORT = 9200;
/**
* Allocate the next available port for a preview deployment.
*
* 1. Queries running preview containers for their cw.port labels
* 2. Finds the next port >= BASE_PORT that isn't in use
* 3. Performs a bind test to verify no external conflict
*
* @returns An available port number
* @throws If no port is available in the range
*/
export async function allocatePort(): Promise<number> {
const usedPorts = new Set(await getPreviewPorts());
log.debug({ usedPorts: Array.from(usedPorts) }, 'ports in use by previews');
for (let port = BASE_PORT; port < MAX_PORT; port++) {
if (usedPorts.has(port)) continue;
if (await isPortAvailable(port)) {
log.info({ port }, 'allocated port');
return port;
}
}
throw new Error(`No available ports in range ${BASE_PORT}-${MAX_PORT}`);
}
/**
* Test if a port is available by attempting to bind to it.
*/
async function isPortAvailable(port: number): Promise<boolean> {
return new Promise((resolve) => {
const server = createServer();
server.once('error', () => {
resolve(false);
});
server.listen(port, '127.0.0.1', () => {
server.close(() => {
resolve(true);
});
});
});
}
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