391 lines
18 KiB
JavaScript
391 lines
18 KiB
JavaScript
"use strict";
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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var __generator = (this && this.__generator) || function (thisArg, body) {
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var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
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return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
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function verb(n) { return function (v) { return step([n, v]); }; }
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function step(op) {
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if (f) throw new TypeError("Generator is already executing.");
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while (_) try {
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if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
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if (y = 0, t) op = [op[0] & 2, t.value];
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switch (op[0]) {
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case 0: case 1: t = op; break;
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case 4: _.label++; return { value: op[1], done: false };
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case 5: _.label++; y = op[1]; op = [0]; continue;
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case 7: op = _.ops.pop(); _.trys.pop(); continue;
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default:
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if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
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if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
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if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
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if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
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if (t[2]) _.ops.pop();
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_.trys.pop(); continue;
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}
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op = body.call(thisArg, _);
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} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
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}
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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var base64_1 = require("@ethersproject/base64");
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var properties_1 = require("@ethersproject/properties");
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var strings_1 = require("@ethersproject/strings");
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var logger_1 = require("@ethersproject/logger");
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var _version_1 = require("./_version");
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var logger = new logger_1.Logger(_version_1.version);
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var geturl_1 = require("./geturl");
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function staller(duration) {
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return new Promise(function (resolve) {
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setTimeout(resolve, duration);
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});
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}
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// This API is still a work in progress; the future changes will likely be:
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// - ConnectionInfo => FetchDataRequest<T = any>
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// - FetchDataRequest.body? = string | Uint8Array | { contentType: string, data: string | Uint8Array }
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// - If string => text/plain, Uint8Array => application/octet-stream (if content-type unspecified)
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// - FetchDataRequest.processFunc = (body: Uint8Array, response: FetchDataResponse) => T
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// For this reason, it should be considered internal until the API is finalized
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function _fetchData(connection, body, processFunc) {
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// How many times to retry in the event of a throttle
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var attemptLimit = (typeof (connection) === "object" && connection.throttleLimit != null) ? connection.throttleLimit : 12;
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logger.assertArgument((attemptLimit > 0 && (attemptLimit % 1) === 0), "invalid connection throttle limit", "connection.throttleLimit", attemptLimit);
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var throttleCallback = ((typeof (connection) === "object") ? connection.throttleCallback : null);
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var throttleSlotInterval = ((typeof (connection) === "object" && typeof (connection.throttleSlotInterval) === "number") ? connection.throttleSlotInterval : 100);
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logger.assertArgument((throttleSlotInterval > 0 && (throttleSlotInterval % 1) === 0), "invalid connection throttle slot interval", "connection.throttleSlotInterval", throttleSlotInterval);
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var headers = {};
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var url = null;
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// @TODO: Allow ConnectionInfo to override some of these values
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var options = {
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method: "GET",
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};
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var allow304 = false;
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var timeout = 2 * 60 * 1000;
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if (typeof (connection) === "string") {
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url = connection;
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}
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else if (typeof (connection) === "object") {
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if (connection == null || connection.url == null) {
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logger.throwArgumentError("missing URL", "connection.url", connection);
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}
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url = connection.url;
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if (typeof (connection.timeout) === "number" && connection.timeout > 0) {
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timeout = connection.timeout;
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}
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if (connection.headers) {
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for (var key in connection.headers) {
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headers[key.toLowerCase()] = { key: key, value: String(connection.headers[key]) };
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if (["if-none-match", "if-modified-since"].indexOf(key.toLowerCase()) >= 0) {
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allow304 = true;
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}
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}
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}
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if (connection.user != null && connection.password != null) {
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if (url.substring(0, 6) !== "https:" && connection.allowInsecureAuthentication !== true) {
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logger.throwError("basic authentication requires a secure https url", logger_1.Logger.errors.INVALID_ARGUMENT, { argument: "url", url: url, user: connection.user, password: "[REDACTED]" });
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}
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var authorization = connection.user + ":" + connection.password;
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headers["authorization"] = {
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key: "Authorization",
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value: "Basic " + base64_1.encode(strings_1.toUtf8Bytes(authorization))
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};
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}
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}
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if (body) {
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options.method = "POST";
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options.body = body;
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if (headers["content-type"] == null) {
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headers["content-type"] = { key: "Content-Type", value: "application/octet-stream" };
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}
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}
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var flatHeaders = {};
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Object.keys(headers).forEach(function (key) {
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var header = headers[key];
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flatHeaders[header.key] = header.value;
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});
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options.headers = flatHeaders;
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var runningTimeout = (function () {
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var timer = null;
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var promise = new Promise(function (resolve, reject) {
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if (timeout) {
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timer = setTimeout(function () {
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if (timer == null) {
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return;
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}
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timer = null;
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reject(logger.makeError("timeout", logger_1.Logger.errors.TIMEOUT, {
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requestBody: (options.body || null),
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requestMethod: options.method,
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timeout: timeout,
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url: url
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}));
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}, timeout);
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}
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});
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var cancel = function () {
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if (timer == null) {
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return;
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}
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clearTimeout(timer);
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timer = null;
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};
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return { promise: promise, cancel: cancel };
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})();
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var runningFetch = (function () {
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return __awaiter(this, void 0, void 0, function () {
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var attempt, response, tryAgain, stall, retryAfter, error_1, body_1, result, error_2, tryAgain, timeout_1;
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return __generator(this, function (_a) {
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switch (_a.label) {
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case 0:
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attempt = 0;
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_a.label = 1;
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case 1:
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if (!(attempt < attemptLimit)) return [3 /*break*/, 19];
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response = null;
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_a.label = 2;
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case 2:
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_a.trys.push([2, 8, , 9]);
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return [4 /*yield*/, geturl_1.getUrl(url, options)];
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case 3:
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response = _a.sent();
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if (!(response.statusCode === 429 && attempt < attemptLimit)) return [3 /*break*/, 7];
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tryAgain = true;
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if (!throttleCallback) return [3 /*break*/, 5];
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return [4 /*yield*/, throttleCallback(attempt, url)];
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case 4:
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tryAgain = _a.sent();
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_a.label = 5;
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case 5:
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if (!tryAgain) return [3 /*break*/, 7];
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stall = 0;
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retryAfter = response.headers["retry-after"];
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if (typeof (retryAfter) === "string" && retryAfter.match(/^[1-9][0-9]*$/)) {
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stall = parseInt(retryAfter) * 1000;
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}
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else {
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stall = throttleSlotInterval * parseInt(String(Math.random() * Math.pow(2, attempt)));
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}
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//console.log("Stalling 429");
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return [4 /*yield*/, staller(stall)];
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case 6:
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//console.log("Stalling 429");
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_a.sent();
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return [3 /*break*/, 18];
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case 7: return [3 /*break*/, 9];
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case 8:
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error_1 = _a.sent();
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response = error_1.response;
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if (response == null) {
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runningTimeout.cancel();
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logger.throwError("missing response", logger_1.Logger.errors.SERVER_ERROR, {
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requestBody: (options.body || null),
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requestMethod: options.method,
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serverError: error_1,
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url: url
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});
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}
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return [3 /*break*/, 9];
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case 9:
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body_1 = response.body;
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if (allow304 && response.statusCode === 304) {
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body_1 = null;
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}
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else if (response.statusCode < 200 || response.statusCode >= 300) {
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runningTimeout.cancel();
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logger.throwError("bad response", logger_1.Logger.errors.SERVER_ERROR, {
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status: response.statusCode,
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headers: response.headers,
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body: body_1,
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requestBody: (options.body || null),
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requestMethod: options.method,
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url: url
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});
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}
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if (!processFunc) return [3 /*break*/, 17];
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_a.label = 10;
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case 10:
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_a.trys.push([10, 12, , 17]);
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return [4 /*yield*/, processFunc(body_1, response)];
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case 11:
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result = _a.sent();
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runningTimeout.cancel();
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return [2 /*return*/, result];
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case 12:
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error_2 = _a.sent();
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if (!(error_2.throttleRetry && attempt < attemptLimit)) return [3 /*break*/, 16];
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tryAgain = true;
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if (!throttleCallback) return [3 /*break*/, 14];
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return [4 /*yield*/, throttleCallback(attempt, url)];
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case 13:
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tryAgain = _a.sent();
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_a.label = 14;
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case 14:
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if (!tryAgain) return [3 /*break*/, 16];
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timeout_1 = throttleSlotInterval * parseInt(String(Math.random() * Math.pow(2, attempt)));
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//console.log("Stalling callback");
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return [4 /*yield*/, staller(timeout_1)];
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case 15:
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//console.log("Stalling callback");
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_a.sent();
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return [3 /*break*/, 18];
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case 16:
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runningTimeout.cancel();
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logger.throwError("processing response error", logger_1.Logger.errors.SERVER_ERROR, {
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body: body_1,
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error: error_2,
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requestBody: (options.body || null),
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requestMethod: options.method,
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url: url
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});
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return [3 /*break*/, 17];
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case 17:
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runningTimeout.cancel();
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// If we had a processFunc, it eitehr returned a T or threw above.
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// The "body" is now a Uint8Array.
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return [2 /*return*/, body_1];
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case 18:
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attempt++;
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return [3 /*break*/, 1];
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case 19: return [2 /*return*/, logger.throwError("failed response", logger_1.Logger.errors.SERVER_ERROR, {
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requestBody: (options.body || null),
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requestMethod: options.method,
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url: url
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})];
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}
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});
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});
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})();
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return Promise.race([runningTimeout.promise, runningFetch]);
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}
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exports._fetchData = _fetchData;
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function fetchJson(connection, json, processFunc) {
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var processJsonFunc = function (value, response) {
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var result = null;
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if (value != null) {
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try {
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result = JSON.parse(strings_1.toUtf8String(value));
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}
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catch (error) {
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logger.throwError("invalid JSON", logger_1.Logger.errors.SERVER_ERROR, {
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body: value,
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error: error
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});
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}
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}
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if (processFunc) {
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result = processFunc(result, response);
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}
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return result;
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};
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// If we have json to send, we must
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// - add content-type of application/json (unless already overridden)
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// - convert the json to bytes
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var body = null;
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if (json != null) {
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body = strings_1.toUtf8Bytes(json);
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// Create a connection with the content-type set for JSON
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var updated = (typeof (connection) === "string") ? ({ url: connection }) : properties_1.shallowCopy(connection);
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if (updated.headers) {
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var hasContentType = (Object.keys(updated.headers).filter(function (k) { return (k.toLowerCase() === "content-type"); }).length) !== 0;
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if (!hasContentType) {
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updated.headers = properties_1.shallowCopy(updated.headers);
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updated.headers["content-type"] = "application/json";
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}
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}
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else {
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updated.headers = { "content-type": "application/json" };
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}
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connection = updated;
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}
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return _fetchData(connection, body, processJsonFunc);
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}
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exports.fetchJson = fetchJson;
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function poll(func, options) {
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if (!options) {
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options = {};
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}
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options = properties_1.shallowCopy(options);
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if (options.floor == null) {
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options.floor = 0;
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}
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if (options.ceiling == null) {
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options.ceiling = 10000;
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}
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if (options.interval == null) {
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options.interval = 250;
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}
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return new Promise(function (resolve, reject) {
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var timer = null;
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var done = false;
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// Returns true if cancel was successful. Unsuccessful cancel means we're already done.
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var cancel = function () {
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if (done) {
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return false;
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}
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done = true;
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if (timer) {
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clearTimeout(timer);
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}
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return true;
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};
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if (options.timeout) {
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timer = setTimeout(function () {
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if (cancel()) {
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reject(new Error("timeout"));
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}
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}, options.timeout);
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}
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var retryLimit = options.retryLimit;
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var attempt = 0;
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function check() {
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return func().then(function (result) {
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// If we have a result, or are allowed null then we're done
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if (result !== undefined) {
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if (cancel()) {
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resolve(result);
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}
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}
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else if (options.oncePoll) {
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options.oncePoll.once("poll", check);
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}
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else if (options.onceBlock) {
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options.onceBlock.once("block", check);
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// Otherwise, exponential back-off (up to 10s) our next request
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}
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else if (!done) {
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attempt++;
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if (attempt > retryLimit) {
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if (cancel()) {
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reject(new Error("retry limit reached"));
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}
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return;
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}
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var timeout = options.interval * parseInt(String(Math.random() * Math.pow(2, attempt)));
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if (timeout < options.floor) {
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timeout = options.floor;
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}
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if (timeout > options.ceiling) {
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timeout = options.ceiling;
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}
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setTimeout(check, timeout);
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}
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return null;
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}, function (error) {
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if (cancel()) {
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reject(error);
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}
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});
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}
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check();
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});
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}
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exports.poll = poll;
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//# sourceMappingURL=index.js.map
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