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October 8, 2018 03:07
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| addEventListener('fetch', event => { | |
| event.respondWith(getLogarithm(event)) | |
| }) | |
| async function getLogarithm(event) { | |
| const url = new URL(event.request.url) | |
| if (!url.searchParams.has("int")) { | |
| return new Response("Missing query parameter 'int'", {status: 403}) | |
| } | |
| const stringInt = url.searchParams.get("int") | |
| const paddedInt = padTo(4, stringInt) | |
| const intInt = parseInt(stringInt) | |
| if ((intInt < 1) || (intInt > 9999)) { | |
| return new Response("'int' must be between 1 and 9999", {status: 403}) | |
| } | |
| const retrieved = await LOGCARD.get(paddedInt) | |
| if (retrieved === null) { | |
| const logarithm = Math.log10(intInt) | |
| const value = Math.round((logarithm - Math.floor(logarithm))*10000000) | |
| const paddedValue = padTo(7, value) | |
| event.waitUntil(LOGCARD.put(paddedInt, paddedValue)) | |
| return makeCard(paddedInt, paddedValue, false) | |
| } | |
| return makeCard(paddedInt, retrieved.toString(), true) | |
| } | |
| async function makeCard(l, r, found) { | |
| var html = '<html><body style="font-family: monospace;"><table style="width: 320px; border: 2px solid black"><thead><tr><td></td><td colspan="4" align="center">Number.</td><td></td><td></td><td></td><td colspan="7" align="center">Table.</td><td></td></tr></thead><tbody>' | |
| html += '<tr style="outline: solid 1px;"><td></td>' | |
| html += perDigit(l) | |
| html += "<td></td><td></td><td></td>" | |
| html += perDigit(r) | |
| html += "<td></td></tr>" | |
| for (var j = 0; j < 9; j++) { | |
| html += "<tr><td></td>" | |
| html += circles(j, l) | |
| html += "<td></td><td></td><td></td>" | |
| html += circles(j, r) | |
| html += "<td></td></tr>" | |
| } | |
| html += "</tbody></table>" | |
| html += "<br>Card was " | |
| html += found?"retrieved":"added" | |
| html += "</body></html>" | |
| return new Response(html, {headers: {"Content-Type": "text/html"}}) | |
| } | |
| function perDigit(s) { | |
| var html = '' | |
| for (var i = 0; i < s.length; i++) { | |
| html += "<td>" | |
| html += s.substr(i, 1) | |
| html += "</td>" | |
| } | |
| return html | |
| } | |
| function circles(j, s) { | |
| var html = '' | |
| for (var i = 0; i < s.length; i++) { | |
| html += "<td>" | |
| html += parseInt(s.substr(i, 1)) > j?'●':'○' | |
| html += "</td>" | |
| } | |
| return html | |
| } | |
| function padTo(n, s) { | |
| return ("0".repeat(n-1) + s).substr(-n) | |
| } |
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