Always properly close and clean up network connections to prevent memory leaks and resource exhaustion. When establishing WebSocket connections or other network resources, ensure they are explicitly closed and event listeners are removed when no longer needed. Additionally, implement resilient error handling strategies for network operations by using...
Always properly close and clean up network connections to prevent memory leaks and resource exhaustion. When establishing WebSocket connections or other network resources, ensure they are explicitly closed and event listeners are removed when no longer needed. Additionally, implement resilient error handling strategies for network operations by using approaches like Promise.allSettled() instead of Promise.all() to handle partial failures gracefully.
Example:
// Bad practice - potential memory leak
async function pingServer(socketProtocol, hostAndPath) {
const socket = new WebSocket(
`${socketProtocol}://${hostAndPath}`,
'vite-ping'
)
return new Promise((resolve) => {
socket.addEventListener('open', () => resolve(true))
socket.addEventListener('error', () => resolve(false))
})
}
// Good practice - properly managed resources
async function pingServer(socketProtocol, hostAndPath) {
const socket = new WebSocket(
`${socketProtocol}://${hostAndPath}`,
'vite-ping'
)
return new Promise((resolve) => {
const onOpen = () => {
cleanup()
resolve(true)
}
const onError = () => {
cleanup()
resolve(false)
}
socket.addEventListener('open', onOpen)
socket.addEventListener('error', onError)
function cleanup() {
socket.removeEventListener('open', onOpen)
socket.removeEventListener('error', onError)
socket.close()
}
})
}
// Use Promise.allSettled for resilient multi-request handling
async function loadResources(urls) {
// Will continue even if some requests fail
const results = await Promise.allSettled(
urls.map(url => fetch(url))
)
// Process successful results, handle failures gracefully
return results.filter(r => r.status === 'fulfilled').map(r => r.value)
}
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