44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
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import { createServer } from "node:net";
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/**
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* Find an available port in the given range.
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* Uses random selection first to avoid conflicts in parallel runs.
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*/
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export async function findAvailablePort(startPort = 3000, endPort = 9000): Promise<number> {
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// Try random port first (better for parallel runs)
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const randomPort = Math.floor(Math.random() * (endPort - startPort + 1)) + startPort;
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if (await isPortAvailable(randomPort)) {
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return randomPort;
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}
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// Fallback: sequential search
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for (let port = startPort; port <= endPort; port++) {
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if (await isPortAvailable(port)) {
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return port;
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}
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}
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throw new Error(`No available ports found in range ${startPort}-${endPort}`);
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}
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/**
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* Check if a port is available by attempting to bind to it.
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*/
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export async function isPortAvailable(port: number): Promise<boolean> {
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return new Promise((resolve) => {
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const server = createServer();
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server.once("error", (err: NodeJS.ErrnoException) => {
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resolve(err.code !== "EADDRINUSE");
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});
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server.once("listening", () => {
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server.close();
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resolve(true);
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});
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server.listen(port, "127.0.0.1");
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});
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}
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