47 lines
1 KiB
TypeScript
47 lines
1 KiB
TypeScript
import type {Server} from 'net'
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export async function tryMultiplePorts(
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port: number,
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tries: number,
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server: Server,
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): Promise<number> {
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let portToTry = port
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let firstError = null
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let lastError = null
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while (portToTry < port + tries) {
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try {
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await new Promise((res, rej) => {
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const onListening = () => (rm(), res(true))
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const onError = () => (rm(), rej())
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const rm = () => {
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server.off('error', onError)
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server.off('listening', onListening)
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}
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server
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.listen(portToTry)
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.on('listening', onListening)
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.on('error', onError)
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})
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firstError = null
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lastError = null
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break // found a working port
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} catch (err) {
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if (!firstError) firstError = err
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lastError = err
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portToTry += 1
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}
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}
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if (firstError) {
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console.error(firstError)
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console.error(lastError)
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throw new Error(
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`Failed to find port starting at ${port} with ${tries} tries.`,
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)
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}
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return portToTry
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}
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