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