hypershield
Version:
Middleware suite for high-performance and resilient APIs
83 lines • 3.69 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.CompressionService = void 0;
const zlib_1 = require("zlib");
const util_1 = require("util");
const constants_1 = require("../../../core/constants/constants");
const gzipAsync = (0, util_1.promisify)(zlib_1.gzip);
const gunzipAsync = (0, util_1.promisify)(zlib_1.gunzip);
class CompressionService {
constructor(options = {}) {
var _a, _b, _c;
this.options = {
level: (_a = options.level) !== null && _a !== void 0 ? _a : constants_1.COMPRESSION.GZIP.DEFAULT_LEVEL,
threshold: (_b = options.threshold) !== null && _b !== void 0 ? _b : constants_1.COMPRESSION.GZIP.MIN_SIZE_TO_COMPRESS,
memLevel: (_c = options.memLevel) !== null && _c !== void 0 ? _c : constants_1.COMPRESSION.GZIP.DEFAULT_MEM_LEVEL
};
}
shouldCompress(data) {
var _a;
const size = Buffer.byteLength(data);
return size >= ((_a = this.options.threshold) !== null && _a !== void 0 ? _a : 0);
}
compress(data) {
return __awaiter(this, void 0, void 0, function* () {
try {
if (!data || (typeof data === 'string' && !data.length) || (Buffer.isBuffer(data) && !data.length)) {
throw new Error('Invalid input: empty data');
}
if (!this.shouldCompress(data)) {
return Buffer.from(data);
}
const input = Buffer.isBuffer(data) ? data : Buffer.from(data);
return yield gzipAsync(input, {
level: this.options.level,
memLevel: this.options.memLevel
});
}
catch (error) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(`Compression failed: ${errorMessage}`);
}
});
}
decompress(data) {
return __awaiter(this, void 0, void 0, function* () {
try {
if (!this.isCompressed(data)) {
return data;
}
return yield gunzipAsync(data);
}
catch (error) {
const errorMessage = error instanceof Error ? error.message : 'Unknown error';
throw new Error(`Decompression failed: ${errorMessage}`);
}
});
}
compressString(data) {
return __awaiter(this, void 0, void 0, function* () {
return this.compress(data);
});
}
decompressToString(data) {
return __awaiter(this, void 0, void 0, function* () {
const decompressed = yield this.decompress(data);
return decompressed.toString();
});
}
isCompressed(data) {
return data.length >= 2 && data[0] === 0x1f && data[1] === 0x8b;
}
}
exports.CompressionService = CompressionService;
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