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Image cache: Don't load doc #1152

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Merged
merged 1 commit into from
Mar 28, 2023
Merged

Image cache: Don't load doc #1152

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24 changes: 15 additions & 9 deletions src/server/routes/api/document/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -224,7 +224,7 @@ const mapToUniprotIds = biopaxTemplate => {
if ( dbPrefix !== 'ncbigene' ){
return Promise.resolve();
}

const UNIPROT_DB_PREFIX = 'uniprot';
const opts = {
id: [
Expand Down Expand Up @@ -1441,26 +1441,32 @@ http.get('/(:id).png', function( req, res, next ){

res.setHeader('content-type', 'image/png');

const fillCache = async (doc, lastEditedDate) => {
const calcTtl = doc => {
const now = Date.now();
const lastEditedDate = doc.lastEditedDate();
return now - lastEditedDate;
};

const fillCache = async doc => {
const img = await getDocumentImageBuffer(doc);
const cache = { img, lastEditedDate };
const cache = { img };
const ttl = calcTtl(doc);

imageCache.set(id, cache);
imageCache.set(id, cache, {ttl});

return cache;
};

const main = async () => {
try {
const doc = await getDoc(id);
const lastEditedDate = '' + doc.lastEditedDate();
const cache = imageCache.get(id);
const canUseCache = imageCache.has(id) && cache.lastEditedDate === lastEditedDate;
const canUseCache = imageCache.has(id);

if( canUseCache ){
const cache = imageCache.get(id);
res.send(cache.img);
} else {
const cache = await fillCache(doc, lastEditedDate);
const doc = await getDoc(id);
const cache = await fillCache(doc);

res.send(cache.img);
}
Expand Down