41 lines
1.4 KiB
JavaScript
41 lines
1.4 KiB
JavaScript
/** Fetches devices + live sessions; polls when tab visible. */
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const POLL_MS = 1500
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const EMPTY_RESPONSE = Object.freeze({ devices: [], liveSessions: [] })
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export function useCameras(options = {}) {
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const { poll: enablePoll = true } = options
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const { data, refresh } = useAsyncData(
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'cameras',
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() => $fetch('/api/cameras').catch(() => EMPTY_RESPONSE),
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{ default: () => EMPTY_RESPONSE },
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)
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const devices = computed(() => Object.freeze([...(data.value?.devices ?? [])]))
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const liveSessions = computed(() => Object.freeze([...(data.value?.liveSessions ?? [])]))
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const cameras = computed(() => Object.freeze([...devices.value, ...liveSessions.value]))
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const pollInterval = ref(null)
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function startPolling() {
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if (!enablePoll || pollInterval.value) return
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refresh()
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pollInterval.value = setInterval(refresh, POLL_MS)
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}
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function stopPolling() {
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if (pollInterval.value) {
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clearInterval(pollInterval.value)
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pollInterval.value = null
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}
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}
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onMounted(() => {
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if (typeof document === 'undefined') return
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document.addEventListener('visibilitychange', () => {
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document.visibilityState === 'visible' ? (startPolling(), refresh()) : stopPolling()
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})
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if (document.visibilityState === 'visible') startPolling()
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})
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onBeforeUnmount(stopPolling)
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return Object.freeze({ data, devices, liveSessions, cameras, refresh, startPolling, stopPolling })
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}
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