smartjimp/ts/smartjimp.classes.smartjimp.ts

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import * as plugins from './smartjimp.plugins.js';
export interface IDimensions {
width?: number;
height?: number;
}
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export class SmartJimp {
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public levelCache = new plugins.levelcache.LevelCache({
cacheId: 'mastercache',
maxMemoryStorageInMB: 100,
maxDiskStorageInMB: 5000,
});
/**
* get a key that is unique for a wanted asset variation
*/
private getCacheKey(
sourceTypeArg: 'path' | 'url' | 'smartfile',
sourceIdArg: string,
wantedDimensionsArg?: IDimensions
) {
return `${sourceTypeArg}_${sourceIdArg}_${
wantedDimensionsArg
? `${wantedDimensionsArg.width || 'auto' }x${wantedDimensionsArg.height || 'auto'}`
: 'original'
}`;
}
private async computeAssetVariation(assetBuffer: Buffer, wantedDimensions?: IDimensions) {
if (!wantedDimensions) {
return assetBuffer;
}
let sharpImage = plugins.sharp(assetBuffer);
sharpImage = sharpImage.resize(wantedDimensions.width, wantedDimensions.height);
const result = await sharpImage.resize(wantedDimensions.width, wantedDimensions.height).jpeg().toBuffer();
return result;
}
public async getFromPath(pathArg: string, wantedDimensionsArg?: IDimensions) {
const cacheKey = this.getCacheKey('path', pathArg, wantedDimensionsArg);
const existingCacheEntry = await this.levelCache.retrieveCacheEntryByKey(cacheKey);
if (existingCacheEntry) {
return existingCacheEntry.contents;
} else {
const originalAssetSmartfile = await plugins.smartfile.Smartfile.fromFilePath(pathArg);
const computedAssetBuffer = await this.computeAssetVariation(originalAssetSmartfile.contentBuffer, wantedDimensionsArg);
this.levelCache.storeCacheEntryByKey(cacheKey, new plugins.levelcache.CacheEntry({
contents: computedAssetBuffer,
ttl: 600000
}));
return computedAssetBuffer;
}
}
public async getFromUrl(urlArg: string, wantedDimensionsArg?: IDimensions) {
const cacheKey = this.getCacheKey('url', urlArg, wantedDimensionsArg);
const existingCacheEntry = await this.levelCache.retrieveCacheEntryByKey(cacheKey);
if (existingCacheEntry) {
return existingCacheEntry.contents;
} else {
const originalAssetBuffer = (await plugins.smartrequest.getBinary(urlArg)).body;
const computedAssetBuffer = await this.computeAssetVariation(originalAssetBuffer, wantedDimensionsArg);
this.levelCache.storeCacheEntryByKey(cacheKey, new plugins.levelcache.CacheEntry({
contents: computedAssetBuffer,
ttl: 600000
}));
return computedAssetBuffer;
}
}
public async getFromSmartfile(
smartfileArg: plugins.smartfile.Smartfile,
wantedDimensionsArg?: IDimensions
) {
const cacheKey = this.getCacheKey('url', await smartfileArg.getHash(), wantedDimensionsArg);
const existingCacheEntry = await this.levelCache.retrieveCacheEntryByKey(cacheKey);
if (existingCacheEntry) {
return existingCacheEntry.contents;
} else {
const computedAssetBuffer = await this.computeAssetVariation(smartfileArg.contentBuffer, wantedDimensionsArg);
this.levelCache.storeCacheEntryByKey(cacheKey, new plugins.levelcache.CacheEntry({
contents: computedAssetBuffer,
ttl: 600000
}));
return computedAssetBuffer;
}
}
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}