224 lines
7.6 KiB
JavaScript
224 lines
7.6 KiB
JavaScript
"use strict";
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var __importStar = (this && this.__importStar) || function (mod) {
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if (mod && mod.__esModule) return mod;
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var result = {};
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if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
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result["default"] = mod;
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return result;
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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var xmlhttprequest_1 = require("xmlhttprequest");
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var base64_1 = require("@ethersproject/base64");
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var errors = __importStar(require("@ethersproject/errors"));
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var properties_1 = require("@ethersproject/properties");
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var strings_1 = require("@ethersproject/strings");
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function fetchJson(connection, json, processFunc) {
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var headers = {};
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var url = null;
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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.url == null) {
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errors.throwError("missing URL", errors.MISSING_ARGUMENT, { arg: "url" });
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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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}
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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.allowInsecure !== true) {
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errors.throwError("basic authentication requires a secure https url", errors.INVALID_ARGUMENT, { arg: "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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return new Promise(function (resolve, reject) {
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var request = new xmlhttprequest_1.XMLHttpRequest();
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var timer = null;
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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(new Error("timeout"));
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setTimeout(function () {
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request.abort();
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}, 0);
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}, timeout);
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var cancelTimeout = 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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if (json) {
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request.open("POST", url, true);
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headers["content-type"] = { key: "Content-Type", value: "application/json" };
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}
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else {
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request.open("GET", url, true);
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}
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Object.keys(headers).forEach(function (key) {
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var header = headers[key];
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request.setRequestHeader(header.key, header.value);
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});
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request.onreadystatechange = function () {
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if (request.readyState !== 4) {
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return;
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}
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if (request.status != 200) {
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cancelTimeout();
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// @TODO: not any!
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var error = new Error("invalid response - " + request.status);
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error.statusCode = request.status;
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if (request.responseText) {
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error.responseText = request.responseText;
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}
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reject(error);
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return;
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}
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var result = null;
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try {
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result = JSON.parse(request.responseText);
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}
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catch (error) {
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cancelTimeout();
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// @TODO: not any!
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var jsonError = new Error("invalid json response");
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jsonError.orginialError = error;
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jsonError.responseText = request.responseText;
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if (json != null) {
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jsonError.requestBody = json;
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}
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jsonError.url = url;
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reject(jsonError);
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return;
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}
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if (processFunc) {
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try {
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result = processFunc(result);
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}
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catch (error) {
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cancelTimeout();
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error.url = url;
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error.body = json;
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error.responseText = request.responseText;
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reject(error);
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return;
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}
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}
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cancelTimeout();
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resolve(result);
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};
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request.onerror = function (error) {
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cancelTimeout();
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reject(error);
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};
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try {
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if (json != null) {
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request.send(json);
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}
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else {
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request.send();
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}
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}
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catch (error) {
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cancelTimeout();
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// @TODO: not any!
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var connectionError = new Error("connection error");
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connectionError.error = error;
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reject(connectionError);
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}
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});
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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.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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