Improved compression

This commit is contained in:
Mario Zechner 2023-06-14 00:11:34 +02:00
parent 561194e64d
commit 7e0b6ac1f6
4 changed files with 428 additions and 9 deletions

View File

@ -153,8 +153,17 @@ function compress(items) {
const compressed = {
stores: STORE_KEYS,
n: items.length,
dates: [],
data: [],
};
const uniqueDates = {};
for (const item of items) {
item.priceHistory.forEach((price) => (uniqueDates[price.date.replaceAll("-", "")] = 0));
}
const dates = (compressed.dates = Object.keys(uniqueDates).sort());
dates.forEach((date, index) => {
uniqueDates[date] = index;
});
const data = compressed.data;
for (item of items) {
data.push(STORE_KEYS.indexOf(item.store));
@ -162,7 +171,7 @@ function compress(items) {
data.push(item.name);
data.push(item.priceHistory.length);
for (price of item.priceHistory) {
data.push(price.date.replaceAll("-", ""));
data.push(uniqueDates[price.date.replaceAll("-", "")]);
data.push(price.price);
}
data.push(item.unit);

422
package-lock.json generated
View File

@ -11,6 +11,7 @@
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@ -731,6 +732,25 @@
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@ -740,6 +760,16 @@
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@ -748,6 +778,24 @@
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@ -837,6 +885,29 @@
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@ -960,6 +1031,11 @@
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@ -1288,6 +1364,28 @@
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@ -1313,6 +1411,14 @@
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@ -1408,11 +1514,33 @@
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@ -1576,6 +1704,14 @@
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@ -1683,6 +1819,11 @@
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@ -1857,6 +2003,11 @@
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{
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"url": "https://github.com/sponsors/feross"
},
{
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"url": "https://www.patreon.com/feross"
},
{
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"url": "https://feross.org/support"
}
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"funding": [
{
"type": "github",
"url": "https://github.com/sponsors/feross"
},
{
"type": "patreon",
"url": "https://www.patreon.com/feross"
},
{
"type": "consulting",
"url": "https://feross.org/support"
}
],
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@ -3181,6 +3514,33 @@
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"funding": [
{
"type": "github",
"url": "https://github.com/sponsors/feross"
},
{
"type": "patreon",
"url": "https://www.patreon.com/feross"
},
{
"type": "consulting",
"url": "https://feross.org/support"
}
]
},
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@ -3214,6 +3574,14 @@
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}
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@ -3298,6 +3666,32 @@
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},
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@ -3417,8 +3822,7 @@
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View File

@ -22,6 +22,7 @@
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"axios": "^1.4.0",
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"chokidar": "^3.5.3",
"compression": "^1.7.4",

View File

@ -6,6 +6,7 @@ function decompress(compressedItems) {
const items = [];
const storeLookup = compressedItems.stores;
const data = compressedItems.data;
const dates = compressedItems.dates;
const numItems = compressedItems.n;
let i = 0;
while (items.length < numItems) {
@ -15,7 +16,7 @@ function decompress(compressedItems) {
const numPrices = data[i++];
const prices = [];
for (let j = 0; j < numPrices; j++) {
const date = data[i++];
const date = dates[data[i++]];
const price = data[i++];
prices.push({
date: date.substring(0, 4) + "-" + date.substring(4, 6) + "-" + date.substring(6, 8),