49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
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let loadQueue = []
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let pendingRequests = new Map()
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function onload(event) {
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let url = event.target.responseURL
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pendingRequests.delete(url)
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postMessage({ success: true, url: url })
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}
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function onerror(event) {
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let url = event.target.responseURL
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pendingRequests.delete(url)
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postMessage({ success: false, url: url })
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}
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function load() {
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loadQueue.forEach(url => {
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let xhr = new XMLHttpRequest()
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xhr.responseType = 'blob'
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xhr.onload = onload
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xhr.onerror = onerror
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xhr.open('GET', url, true)
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xhr.send()
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pendingRequests.set(url, xhr)
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})
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}
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self.onmessage = event => {
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let msg = event.data
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switch (msg.command) {
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case 'load':
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for (let url of msg.urls) {
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console.log('Load', url)
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loadQueue.push(url)
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}
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load()
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break
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case 'abort':
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loadQueue = []
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for (let xhr of pendingRequests.values()) {
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console.log('Abort')
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xhr.abort()
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}
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break
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default:
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console.warn('Unknown worker command: ' + msg.command)
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}
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}
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