404 lines
17 KiB
JavaScript
404 lines
17 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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import { decode as base64Decode, encode as base64Encode } from "@ethersproject/base64";
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import { hexlify, isBytesLike } from "@ethersproject/bytes";
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import { shallowCopy } from "@ethersproject/properties";
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import { toUtf8Bytes, toUtf8String } from "@ethersproject/strings";
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import { Logger } from "@ethersproject/logger";
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import { version } from "./_version";
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const logger = new Logger(version);
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import { getUrl } from "./geturl";
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function staller(duration) {
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return new Promise((resolve) => {
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setTimeout(resolve, duration);
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});
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}
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function bodyify(value, type) {
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if (value == null) {
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return null;
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}
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if (typeof (value) === "string") {
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return value;
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}
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if (isBytesLike(value)) {
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if (type && (type.split("/")[0] === "text" || type.split(";")[0].trim() === "application/json")) {
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try {
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return toUtf8String(value);
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}
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catch (error) { }
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;
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}
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return hexlify(value);
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}
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return value;
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}
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function unpercent(value) {
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return toUtf8Bytes(value.replace(/%([0-9a-f][0-9a-f])/gi, (all, code) => {
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return String.fromCharCode(parseInt(code, 16));
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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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export function _fetchData(connection, body, processFunc) {
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// How many times to retry in the event of a throttle
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const 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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const throttleCallback = ((typeof (connection) === "object") ? connection.throttleCallback : null);
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const 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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const errorPassThrough = ((typeof (connection) === "object") ? !!(connection.errorPassThrough) : false);
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const headers = {};
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let url = null;
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// @TODO: Allow ConnectionInfo to override some of these values
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const options = {
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method: "GET",
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};
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let allow304 = false;
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let 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 (const 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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options.allowGzip = !!connection.allowGzip;
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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.errors.INVALID_ARGUMENT, { argument: "url", url: url, user: connection.user, password: "[REDACTED]" });
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}
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const authorization = connection.user + ":" + connection.password;
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headers["authorization"] = {
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key: "Authorization",
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value: "Basic " + base64Encode(toUtf8Bytes(authorization))
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};
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}
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if (connection.skipFetchSetup != null) {
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options.skipFetchSetup = !!connection.skipFetchSetup;
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}
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if (connection.fetchOptions != null) {
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options.fetchOptions = shallowCopy(connection.fetchOptions);
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}
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}
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const reData = new RegExp("^data:([^;:]*)?(;base64)?,(.*)$", "i");
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const dataMatch = ((url) ? url.match(reData) : null);
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if (dataMatch) {
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try {
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const response = {
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statusCode: 200,
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statusMessage: "OK",
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headers: { "content-type": (dataMatch[1] || "text/plain") },
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body: (dataMatch[2] ? base64Decode(dataMatch[3]) : unpercent(dataMatch[3]))
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};
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let result = response.body;
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if (processFunc) {
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result = processFunc(response.body, response);
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}
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return Promise.resolve(result);
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}
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catch (error) {
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logger.throwError("processing response error", Logger.errors.SERVER_ERROR, {
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body: bodyify(dataMatch[1], dataMatch[2]),
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error: error,
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requestBody: null,
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requestMethod: "GET",
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url: url
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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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if (headers["content-length"] == null) {
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headers["content-length"] = { key: "Content-Length", value: String(body.length) };
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}
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}
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const flatHeaders = {};
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Object.keys(headers).forEach((key) => {
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const 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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const runningTimeout = (function () {
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let timer = null;
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const promise = new Promise(function (resolve, reject) {
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if (timeout) {
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timer = setTimeout(() => {
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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.errors.TIMEOUT, {
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requestBody: bodyify(options.body, flatHeaders["content-type"]),
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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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const 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, cancel };
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})();
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const runningFetch = (function () {
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return __awaiter(this, void 0, void 0, function* () {
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for (let attempt = 0; attempt < attemptLimit; attempt++) {
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let response = null;
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try {
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response = yield getUrl(url, options);
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if (attempt < attemptLimit) {
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if (response.statusCode === 301 || response.statusCode === 302) {
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// Redirection; for now we only support absolute locataions
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const location = response.headers.location || "";
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if (options.method === "GET" && location.match(/^https:/)) {
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url = response.headers.location;
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continue;
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}
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}
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else if (response.statusCode === 429) {
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// Exponential back-off throttling
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let tryAgain = true;
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if (throttleCallback) {
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tryAgain = yield throttleCallback(attempt, url);
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}
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if (tryAgain) {
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let stall = 0;
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const 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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yield staller(stall);
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continue;
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}
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}
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}
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}
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catch (error) {
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response = error.response;
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if (response == null) {
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runningTimeout.cancel();
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logger.throwError("missing response", Logger.errors.SERVER_ERROR, {
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requestBody: bodyify(options.body, flatHeaders["content-type"]),
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requestMethod: options.method,
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serverError: error,
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url: url
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});
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}
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}
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let body = response.body;
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if (allow304 && response.statusCode === 304) {
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body = null;
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}
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else if (!errorPassThrough && (response.statusCode < 200 || response.statusCode >= 300)) {
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runningTimeout.cancel();
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logger.throwError("bad response", Logger.errors.SERVER_ERROR, {
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status: response.statusCode,
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headers: response.headers,
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body: bodyify(body, ((response.headers) ? response.headers["content-type"] : null)),
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requestBody: bodyify(options.body, flatHeaders["content-type"]),
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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) {
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try {
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const result = yield processFunc(body, response);
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runningTimeout.cancel();
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return result;
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}
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catch (error) {
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// Allow the processFunc to trigger a throttle
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if (error.throttleRetry && attempt < attemptLimit) {
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let tryAgain = true;
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if (throttleCallback) {
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tryAgain = yield throttleCallback(attempt, url);
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}
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if (tryAgain) {
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const timeout = throttleSlotInterval * parseInt(String(Math.random() * Math.pow(2, attempt)));
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//console.log("Stalling callback");
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yield staller(timeout);
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continue;
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}
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}
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runningTimeout.cancel();
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logger.throwError("processing response error", Logger.errors.SERVER_ERROR, {
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body: bodyify(body, ((response.headers) ? response.headers["content-type"] : null)),
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error: error,
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requestBody: bodyify(options.body, flatHeaders["content-type"]),
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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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runningTimeout.cancel();
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// If we had a processFunc, it either returned a T or threw above.
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// The "body" is now a Uint8Array.
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return body;
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}
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return logger.throwError("failed response", Logger.errors.SERVER_ERROR, {
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requestBody: bodyify(options.body, flatHeaders["content-type"]),
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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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return Promise.race([runningTimeout.promise, runningFetch]);
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}
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export function fetchJson(connection, json, processFunc) {
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let processJsonFunc = (value, response) => {
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let result = null;
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if (value != null) {
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try {
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result = JSON.parse(toUtf8String(value));
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}
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catch (error) {
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logger.throwError("invalid JSON", 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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let body = null;
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if (json != null) {
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body = toUtf8Bytes(json);
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// Create a connection with the content-type set for JSON
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const updated = (typeof (connection) === "string") ? ({ url: connection }) : shallowCopy(connection);
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if (updated.headers) {
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const hasContentType = (Object.keys(updated.headers).filter((k) => (k.toLowerCase() === "content-type")).length) !== 0;
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if (!hasContentType) {
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updated.headers = 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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export function poll(func, options) {
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if (!options) {
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options = {};
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}
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options = 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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let timer = null;
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let done = false;
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// Returns true if cancel was successful. Unsuccessful cancel means we're already done.
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const cancel = () => {
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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(() => {
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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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const retryLimit = options.retryLimit;
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let 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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let 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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//# sourceMappingURL=index.js.map
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