genomic-reader
Version:
A Typescript library for reading BigWig, BigBed, 2bit, and Bam files. Capable of streaming. For use in the browser or on Node.js.
52 lines • 2.27 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.AxiosDataLoader = void 0;
const DataLoader_1 = require("./DataLoader");
const axios_1 = require("axios");
class AxiosDataLoader {
constructor(url, axios = axios_1.default.create()) {
this.url = url;
this.axios = axios;
this.cachedFileSize = undefined;
}
load(start, size) {
return __awaiter(this, void 0, void 0, function* () {
const response = yield this.axios.get(this.url, {
responseType: 'arraybuffer',
headers: { "Range": `bytes=${start}-${size ? start + size - 1 : ""}` }
});
if (416 == response.status) {
throw new DataLoader_1.OutOfRangeError(this.url, start, size);
}
if (response.data instanceof Buffer) {
return new Uint8Array(response.data).buffer;
}
else {
return response.data;
}
});
}
loadStream(start, size) {
return __awaiter(this, void 0, void 0, function* () {
const response = yield this.axios.get(this.url, {
responseType: 'stream',
headers: { "Range": `bytes=${start}-${size ? start + size - 1 : ""}` }
});
if (416 == response.status) {
throw new DataLoader_1.OutOfRangeError(this.url, start, size);
}
return response.data;
});
}
}
exports.AxiosDataLoader = AxiosDataLoader;
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