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node_modules/firebase-admin/lib/utils/api-request.js
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/*! firebase-admin v10.0.1 */
"use strict";
/*!
* @license
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.ExponentialBackoffPoller = exports.ApiSettings = exports.AuthorizedHttpClient = exports.parseHttpResponse = exports.HttpClient = exports.defaultRetryConfig = exports.HttpError = void 0;
var error_1 = require("./error");
var validator = require("./validator");
var http = require("http");
var https = require("https");
var url = require("url");
var events_1 = require("events");
var DefaultHttpResponse = /** @class */ (function () {
/**
* Constructs a new HttpResponse from the given LowLevelResponse.
*/
function DefaultHttpResponse(resp) {
this.status = resp.status;
this.headers = resp.headers;
this.text = resp.data;
try {
if (!resp.data) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INTERNAL_ERROR, 'HTTP response missing data.');
}
this.parsedData = JSON.parse(resp.data);
}
catch (err) {
this.parsedData = undefined;
this.parseError = err;
}
this.request = resp.config.method + " " + resp.config.url;
}
Object.defineProperty(DefaultHttpResponse.prototype, "data", {
get: function () {
if (this.isJson()) {
return this.parsedData;
}
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.UNABLE_TO_PARSE_RESPONSE, "Error while parsing response data: \"" + this.parseError.toString() + "\". Raw server " +
("response: \"" + this.text + "\". Status code: \"" + this.status + "\". Outgoing ") +
("request: \"" + this.request + ".\""));
},
enumerable: false,
configurable: true
});
DefaultHttpResponse.prototype.isJson = function () {
return typeof this.parsedData !== 'undefined';
};
return DefaultHttpResponse;
}());
/**
* Represents a multipart HTTP response. Parts that constitute the response body can be accessed
* via the multipart getter. Getters for text and data throw errors.
*/
var MultipartHttpResponse = /** @class */ (function () {
function MultipartHttpResponse(resp) {
this.status = resp.status;
this.headers = resp.headers;
this.multipart = resp.multipart;
}
Object.defineProperty(MultipartHttpResponse.prototype, "text", {
get: function () {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.UNABLE_TO_PARSE_RESPONSE, 'Unable to parse multipart payload as text');
},
enumerable: false,
configurable: true
});
Object.defineProperty(MultipartHttpResponse.prototype, "data", {
get: function () {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.UNABLE_TO_PARSE_RESPONSE, 'Unable to parse multipart payload as JSON');
},
enumerable: false,
configurable: true
});
MultipartHttpResponse.prototype.isJson = function () {
return false;
};
return MultipartHttpResponse;
}());
var HttpError = /** @class */ (function (_super) {
__extends(HttpError, _super);
function HttpError(response) {
var _this = _super.call(this, "Server responded with status " + response.status + ".") || this;
_this.response = response;
// Set the prototype so that instanceof checks will work correctly.
// See: https://github.com/Microsoft/TypeScript/issues/13965
Object.setPrototypeOf(_this, HttpError.prototype);
return _this;
}
return HttpError;
}(Error));
exports.HttpError = HttpError;
/**
* Default retry configuration for HTTP requests. Retries up to 4 times on connection reset and timeout errors
* as well as HTTP 503 errors. Exposed as a function to ensure that every HttpClient gets its own RetryConfig
* instance.
*/
function defaultRetryConfig() {
return {
maxRetries: 4,
statusCodes: [503],
ioErrorCodes: ['ECONNRESET', 'ETIMEDOUT'],
backOffFactor: 0.5,
maxDelayInMillis: 60 * 1000,
};
}
exports.defaultRetryConfig = defaultRetryConfig;
/**
* Ensures that the given RetryConfig object is valid.
*
* @param retry - The configuration to be validated.
*/
function validateRetryConfig(retry) {
if (!validator.isNumber(retry.maxRetries) || retry.maxRetries < 0) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INVALID_ARGUMENT, 'maxRetries must be a non-negative integer');
}
if (typeof retry.backOffFactor !== 'undefined') {
if (!validator.isNumber(retry.backOffFactor) || retry.backOffFactor < 0) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INVALID_ARGUMENT, 'backOffFactor must be a non-negative number');
}
}
if (!validator.isNumber(retry.maxDelayInMillis) || retry.maxDelayInMillis < 0) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INVALID_ARGUMENT, 'maxDelayInMillis must be a non-negative integer');
}
if (typeof retry.statusCodes !== 'undefined' && !validator.isArray(retry.statusCodes)) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INVALID_ARGUMENT, 'statusCodes must be an array');
}
if (typeof retry.ioErrorCodes !== 'undefined' && !validator.isArray(retry.ioErrorCodes)) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INVALID_ARGUMENT, 'ioErrorCodes must be an array');
}
}
var HttpClient = /** @class */ (function () {
function HttpClient(retry) {
if (retry === void 0) { retry = defaultRetryConfig(); }
this.retry = retry;
if (this.retry) {
validateRetryConfig(this.retry);
}
}
/**
* Sends an HTTP request to a remote server. If the server responds with a successful response (2xx), the returned
* promise resolves with an HttpResponse. If the server responds with an error (3xx, 4xx, 5xx), the promise rejects
* with an HttpError. In case of all other errors, the promise rejects with a FirebaseAppError. If a request fails
* due to a low-level network error, transparently retries the request once before rejecting the promise.
*
* If the request data is specified as an object, it will be serialized into a JSON string. The application/json
* content-type header will also be automatically set in this case. For all other payload types, the content-type
* header should be explicitly set by the caller. To send a JSON leaf value (e.g. "foo", 5), parse it into JSON,
* and pass as a string or a Buffer along with the appropriate content-type header.
*
* @param config - HTTP request to be sent.
* @returns A promise that resolves with the response details.
*/
HttpClient.prototype.send = function (config) {
return this.sendWithRetry(config);
};
/**
* Sends an HTTP request. In the event of an error, retries the HTTP request according to the
* RetryConfig set on the HttpClient.
*
* @param config - HTTP request to be sent.
* @param retryAttempts - Number of retries performed up to now.
* @returns A promise that resolves with the response details.
*/
HttpClient.prototype.sendWithRetry = function (config, retryAttempts) {
var _this = this;
if (retryAttempts === void 0) { retryAttempts = 0; }
return AsyncHttpCall.invoke(config)
.then(function (resp) {
return _this.createHttpResponse(resp);
})
.catch(function (err) {
var _a = _this.getRetryDelayMillis(retryAttempts, err), delayMillis = _a[0], canRetry = _a[1];
if (canRetry && _this.retry && delayMillis <= _this.retry.maxDelayInMillis) {
return _this.waitForRetry(delayMillis).then(function () {
return _this.sendWithRetry(config, retryAttempts + 1);
});
}
if (err.response) {
throw new HttpError(_this.createHttpResponse(err.response));
}
if (err.code === 'ETIMEDOUT') {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.NETWORK_TIMEOUT, "Error while making request: " + err.message + ".");
}
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.NETWORK_ERROR, "Error while making request: " + err.message + ". Error code: " + err.code);
});
};
HttpClient.prototype.createHttpResponse = function (resp) {
if (resp.multipart) {
return new MultipartHttpResponse(resp);
}
return new DefaultHttpResponse(resp);
};
HttpClient.prototype.waitForRetry = function (delayMillis) {
if (delayMillis > 0) {
return new Promise(function (resolve) {
setTimeout(resolve, delayMillis);
});
}
return Promise.resolve();
};
/**
* Checks if a failed request is eligible for a retry, and if so returns the duration to wait before initiating
* the retry.
*
* @param retryAttempts - Number of retries completed up to now.
* @param err - The last encountered error.
* @returns A 2-tuple where the 1st element is the duration to wait before another retry, and the
* 2nd element is a boolean indicating whether the request is eligible for a retry or not.
*/
HttpClient.prototype.getRetryDelayMillis = function (retryAttempts, err) {
if (!this.isRetryEligible(retryAttempts, err)) {
return [0, false];
}
var response = err.response;
if (response && response.headers['retry-after']) {
var delayMillis = this.parseRetryAfterIntoMillis(response.headers['retry-after']);
if (delayMillis > 0) {
return [delayMillis, true];
}
}
return [this.backOffDelayMillis(retryAttempts), true];
};
HttpClient.prototype.isRetryEligible = function (retryAttempts, err) {
if (!this.retry) {
return false;
}
if (retryAttempts >= this.retry.maxRetries) {
return false;
}
if (err.response) {
var statusCodes = this.retry.statusCodes || [];
return statusCodes.indexOf(err.response.status) !== -1;
}
if (err.code) {
var retryCodes = this.retry.ioErrorCodes || [];
return retryCodes.indexOf(err.code) !== -1;
}
return false;
};
/**
* Parses the Retry-After HTTP header as a milliseconds value. Return value is negative if the Retry-After header
* contains an expired timestamp or otherwise malformed.
*/
HttpClient.prototype.parseRetryAfterIntoMillis = function (retryAfter) {
var delaySeconds = parseInt(retryAfter, 10);
if (!isNaN(delaySeconds)) {
return delaySeconds * 1000;
}
var date = new Date(retryAfter);
if (!isNaN(date.getTime())) {
return date.getTime() - Date.now();
}
return -1;
};
HttpClient.prototype.backOffDelayMillis = function (retryAttempts) {
if (retryAttempts === 0) {
return 0;
}
if (!this.retry) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INTERNAL_ERROR, 'Expected this.retry to exist.');
}
var backOffFactor = this.retry.backOffFactor || 0;
var delayInSeconds = (Math.pow(2, retryAttempts)) * backOffFactor;
return Math.min(delayInSeconds * 1000, this.retry.maxDelayInMillis);
};
return HttpClient;
}());
exports.HttpClient = HttpClient;
/**
* Parses a full HTTP response message containing both a header and a body.
*
* @param response - The HTTP response to be parsed.
* @param config - The request configuration that resulted in the HTTP response.
* @returns An object containing the parsed HTTP status, headers and the body.
*/
function parseHttpResponse(response, config) {
var responseText = validator.isBuffer(response) ?
response.toString('utf-8') : response;
var endOfHeaderPos = responseText.indexOf('\r\n\r\n');
var headerLines = responseText.substring(0, endOfHeaderPos).split('\r\n');
var statusLine = headerLines[0];
var status = statusLine.trim().split(/\s/)[1];
var headers = {};
headerLines.slice(1).forEach(function (line) {
var colonPos = line.indexOf(':');
var name = line.substring(0, colonPos).trim().toLowerCase();
var value = line.substring(colonPos + 1).trim();
headers[name] = value;
});
var data = responseText.substring(endOfHeaderPos + 4);
if (data.endsWith('\n')) {
data = data.slice(0, -1);
}
if (data.endsWith('\r')) {
data = data.slice(0, -1);
}
var lowLevelResponse = {
status: parseInt(status, 10),
headers: headers,
data: data,
config: config,
request: null,
};
if (!validator.isNumber(lowLevelResponse.status)) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INTERNAL_ERROR, 'Malformed HTTP status line.');
}
return new DefaultHttpResponse(lowLevelResponse);
}
exports.parseHttpResponse = parseHttpResponse;
/**
* A helper class for sending HTTP requests over the wire. This is a wrapper around the standard
* http and https packages of Node.js, providing content processing, timeouts and error handling.
* It also wraps the callback API of the Node.js standard library in a more flexible Promise API.
*/
var AsyncHttpCall = /** @class */ (function () {
function AsyncHttpCall(config) {
var _this = this;
try {
this.config = new HttpRequestConfigImpl(config);
this.options = this.config.buildRequestOptions();
this.entity = this.config.buildEntity(this.options.headers);
this.promise = new Promise(function (resolve, reject) {
_this.resolve = resolve;
_this.reject = reject;
_this.execute();
});
}
catch (err) {
this.promise = Promise.reject(this.enhanceError(err, null));
}
}
/**
* Sends an HTTP request based on the provided configuration.
*/
AsyncHttpCall.invoke = function (config) {
return new AsyncHttpCall(config).promise;
};
AsyncHttpCall.prototype.execute = function () {
var _this = this;
var transport = this.options.protocol === 'https:' ? https : http;
var req = transport.request(this.options, function (res) {
_this.handleResponse(res, req);
});
// Handle errors
req.on('error', function (err) {
if (req.aborted) {
return;
}
_this.enhanceAndReject(err, null, req);
});
var timeout = this.config.timeout;
var timeoutCallback = function () {
req.abort();
_this.rejectWithError("timeout of " + timeout + "ms exceeded", 'ETIMEDOUT', req);
};
if (timeout) {
// Listen to timeouts and throw an error.
req.setTimeout(timeout, timeoutCallback);
req.on('socket', function (socket) {
socket.setTimeout(timeout, timeoutCallback);
});
}
// Send the request
req.end(this.entity);
};
AsyncHttpCall.prototype.handleResponse = function (res, req) {
if (req.aborted) {
return;
}
if (!res.statusCode) {
throw new error_1.FirebaseAppError(error_1.AppErrorCodes.INTERNAL_ERROR, 'Expected a statusCode on the response from a ClientRequest');
}
var response = {
status: res.statusCode,
headers: res.headers,
request: req,
data: undefined,
config: this.config,
};
var boundary = this.getMultipartBoundary(res.headers);
var respStream = this.uncompressResponse(res);
if (boundary) {
this.handleMultipartResponse(response, respStream, boundary);
}
else {
this.handleRegularResponse(response, respStream);
}
};
/**
* Extracts multipart boundary from the HTTP header. The content-type header of a multipart
* response has the form 'multipart/subtype; boundary=string'.
*
* If the content-type header does not exist, or does not start with
* 'multipart/', then null will be returned.
*/
AsyncHttpCall.prototype.getMultipartBoundary = function (headers) {
var contentType = headers['content-type'];
if (!contentType || !contentType.startsWith('multipart/')) {
return null;
}
var segments = contentType.split(';');
var emptyObject = {};
var headerParams = segments.slice(1)
.map(function (segment) { return segment.trim().split('='); })
.reduce(function (curr, params) {
// Parse key=value pairs in the content-type header into properties of an object.
if (params.length === 2) {
var keyValuePair = {};
keyValuePair[params[0]] = params[1];
return Object.assign(curr, keyValuePair);
}
return curr;
}, emptyObject);
return headerParams.boundary;
};
AsyncHttpCall.prototype.uncompressResponse = function (res) {
// Uncompress the response body transparently if required.
var respStream = res;
var encodings = ['gzip', 'compress', 'deflate'];
if (res.headers['content-encoding'] && encodings.indexOf(res.headers['content-encoding']) !== -1) {
// Add the unzipper to the body stream processing pipeline.
var zlib = require('zlib'); // eslint-disable-line @typescript-eslint/no-var-requires
respStream = respStream.pipe(zlib.createUnzip());
// Remove the content-encoding in order to not confuse downstream operations.
delete res.headers['content-encoding'];
}
return respStream;
};
AsyncHttpCall.prototype.handleMultipartResponse = function (response, respStream, boundary) {
var _this = this;
var dicer = require('dicer'); // eslint-disable-line @typescript-eslint/no-var-requires
var multipartParser = new dicer({ boundary: boundary });
var responseBuffer = [];
multipartParser.on('part', function (part) {
var tempBuffers = [];
part.on('data', function (partData) {
tempBuffers.push(partData);
});
part.on('end', function () {
responseBuffer.push(Buffer.concat(tempBuffers));
});
});
multipartParser.on('finish', function () {
response.data = undefined;
response.multipart = responseBuffer;
_this.finalizeResponse(response);
});
respStream.pipe(multipartParser);
};
AsyncHttpCall.prototype.handleRegularResponse = function (response, respStream) {
var _this = this;
var responseBuffer = [];
respStream.on('data', function (chunk) {
responseBuffer.push(chunk);
});
respStream.on('error', function (err) {
var req = response.request;
if (req && req.aborted) {
return;
}
_this.enhanceAndReject(err, null, req);
});
respStream.on('end', function () {
response.data = Buffer.concat(responseBuffer).toString();
_this.finalizeResponse(response);
});
};
/**
* Finalizes the current HTTP call in-flight by either resolving or rejecting the associated
* promise. In the event of an error, adds additional useful information to the returned error.
*/
AsyncHttpCall.prototype.finalizeResponse = function (response) {
if (response.status >= 200 && response.status < 300) {
this.resolve(response);
}
else {
this.rejectWithError('Request failed with status code ' + response.status, null, response.request, response);
}
};
/**
* Creates a new error from the given message, and enhances it with other information available.
* Then the promise associated with this HTTP call is rejected with the resulting error.
*/
AsyncHttpCall.prototype.rejectWithError = function (message, code, request, response) {
var error = new Error(message);
this.enhanceAndReject(error, code, request, response);
};
AsyncHttpCall.prototype.enhanceAndReject = function (error, code, request, response) {
this.reject(this.enhanceError(error, code, request, response));
};
/**
* Enhances the given error by adding more information to it. Specifically, the HttpRequestConfig,
* the underlying request and response will be attached to the error.
*/
AsyncHttpCall.prototype.enhanceError = function (error, code, request, response) {
error.config = this.config;
if (code) {
error.code = code;
}
error.request = request;
error.response = response;
return error;
};
return AsyncHttpCall;
}());
/**
* An adapter class for extracting options and entity data from an HttpRequestConfig.
*/
var HttpRequestConfigImpl = /** @class */ (function () {
function HttpRequestConfigImpl(config) {
this.config = config;
}
Object.defineProperty(HttpRequestConfigImpl.prototype, "method", {
get: function () {
return this.config.method;
},
enumerable: false,
configurable: true
});
Object.defineProperty(HttpRequestConfigImpl.prototype, "url", {
get: function () {
return this.config.url;
},
enumerable: false,
configurable: true
});
Object.defineProperty(HttpRequestConfigImpl.prototype, "headers", {
get: function () {
return this.config.headers;
},
enumerable: false,
configurable: true
});
Object.defineProperty(HttpRequestConfigImpl.prototype, "data", {
get: function () {
return this.config.data;
},
enumerable: false,
configurable: true
});
Object.defineProperty(HttpRequestConfigImpl.prototype, "timeout", {
get: function () {
return this.config.timeout;
},
enumerable: false,
configurable: true
});
Object.defineProperty(HttpRequestConfigImpl.prototype, "httpAgent", {
get: function () {
return this.config.httpAgent;
},
enumerable: false,
configurable: true
});
HttpRequestConfigImpl.prototype.buildRequestOptions = function () {
var parsed = this.buildUrl();
var protocol = parsed.protocol;
var port = parsed.port;
if (!port) {
var isHttps = protocol === 'https:';
port = isHttps ? '443' : '80';
}
return {
protocol: protocol,
hostname: parsed.hostname,
port: port,
path: parsed.path,
method: this.method,
agent: this.httpAgent,
headers: Object.assign({}, this.headers),
};
};
HttpRequestConfigImpl.prototype.buildEntity = function (headers) {
var data;
if (!this.hasEntity() || !this.isEntityEnclosingRequest()) {
return data;
}
if (validator.isBuffer(this.data)) {
data = this.data;
}
else if (validator.isObject(this.data)) {
data = Buffer.from(JSON.stringify(this.data), 'utf-8');
if (typeof headers['content-type'] === 'undefined') {
headers['content-type'] = 'application/json;charset=utf-8';
}
}
else if (validator.isString(this.data)) {
data = Buffer.from(this.data, 'utf-8');
}
else {
throw new Error('Request data must be a string, a Buffer or a json serializable object');
}
// Add Content-Length header if data exists.
headers['Content-Length'] = data.length.toString();
return data;
};
HttpRequestConfigImpl.prototype.buildUrl = function () {
var fullUrl = this.urlWithProtocol();
if (!this.hasEntity() || this.isEntityEnclosingRequest()) {
return url.parse(fullUrl);
}
if (!validator.isObject(this.data)) {
throw new Error(this.method + " requests cannot have a body");
}
// Parse URL and append data to query string.
var parsedUrl = new url.URL(fullUrl);
var dataObj = this.data;
for (var key in dataObj) {
if (Object.prototype.hasOwnProperty.call(dataObj, key)) {
parsedUrl.searchParams.append(key, dataObj[key]);
}
}
return url.parse(parsedUrl.toString());
};
HttpRequestConfigImpl.prototype.urlWithProtocol = function () {
var fullUrl = this.url;
if (fullUrl.startsWith('http://') || fullUrl.startsWith('https://')) {
return fullUrl;
}
return "https://" + fullUrl;
};
HttpRequestConfigImpl.prototype.hasEntity = function () {
return !!this.data;
};
HttpRequestConfigImpl.prototype.isEntityEnclosingRequest = function () {
// GET and HEAD requests do not support entity (body) in request.
return this.method !== 'GET' && this.method !== 'HEAD';
};
return HttpRequestConfigImpl;
}());
var AuthorizedHttpClient = /** @class */ (function (_super) {
__extends(AuthorizedHttpClient, _super);
function AuthorizedHttpClient(app) {
var _this = _super.call(this) || this;
_this.app = app;
return _this;
}
AuthorizedHttpClient.prototype.send = function (request) {
var _this = this;
return this.getToken().then(function (token) {
var requestCopy = Object.assign({}, request);
requestCopy.headers = Object.assign({}, request.headers);
var authHeader = 'Authorization';
requestCopy.headers[authHeader] = "Bearer " + token;
if (!requestCopy.httpAgent && _this.app.options.httpAgent) {
requestCopy.httpAgent = _this.app.options.httpAgent;
}
return _super.prototype.send.call(_this, requestCopy);
});
};
AuthorizedHttpClient.prototype.getToken = function () {
return this.app.INTERNAL.getToken()
.then(function (accessTokenObj) {
return accessTokenObj.accessToken;
});
};
return AuthorizedHttpClient;
}(HttpClient));
exports.AuthorizedHttpClient = AuthorizedHttpClient;
/**
* Class that defines all the settings for the backend API endpoint.
*
* @param endpoint - The Firebase Auth backend endpoint.
* @param httpMethod - The http method for that endpoint.
* @constructor
*/
var ApiSettings = /** @class */ (function () {
function ApiSettings(endpoint, httpMethod) {
if (httpMethod === void 0) { httpMethod = 'POST'; }
this.endpoint = endpoint;
this.httpMethod = httpMethod;
this.setRequestValidator(null)
.setResponseValidator(null);
}
/** @returns The backend API endpoint. */
ApiSettings.prototype.getEndpoint = function () {
return this.endpoint;
};
/** @returns The request HTTP method. */
ApiSettings.prototype.getHttpMethod = function () {
return this.httpMethod;
};
/**
* @param requestValidator - The request validator.
* @returns The current API settings instance.
*/
ApiSettings.prototype.setRequestValidator = function (requestValidator) {
var nullFunction = function () { return undefined; };
this.requestValidator = requestValidator || nullFunction;
return this;
};
/** @returns The request validator. */
ApiSettings.prototype.getRequestValidator = function () {
return this.requestValidator;
};
/**
* @param responseValidator - The response validator.
* @returns The current API settings instance.
*/
ApiSettings.prototype.setResponseValidator = function (responseValidator) {
var nullFunction = function () { return undefined; };
this.responseValidator = responseValidator || nullFunction;
return this;
};
/** @returns The response validator. */
ApiSettings.prototype.getResponseValidator = function () {
return this.responseValidator;
};
return ApiSettings;
}());
exports.ApiSettings = ApiSettings;
/**
* Class used for polling an endpoint with exponential backoff.
*
* Example usage:
* ```
* const poller = new ExponentialBackoffPoller();
* poller
* .poll(() => {
* return myRequestToPoll()
* .then((responseData: any) => {
* if (!isValid(responseData)) {
* // Continue polling.
* return null;
* }
*
* // Polling complete. Resolve promise with final response data.
* return responseData;
* });
* })
* .then((responseData: any) => {
* console.log(`Final response: ${responseData}`);
* });
* ```
*/
var ExponentialBackoffPoller = /** @class */ (function (_super) {
__extends(ExponentialBackoffPoller, _super);
function ExponentialBackoffPoller(initialPollingDelayMillis, maxPollingDelayMillis, masterTimeoutMillis) {
if (initialPollingDelayMillis === void 0) { initialPollingDelayMillis = 1000; }
if (maxPollingDelayMillis === void 0) { maxPollingDelayMillis = 10000; }
if (masterTimeoutMillis === void 0) { masterTimeoutMillis = 60000; }
var _this = _super.call(this) || this;
_this.initialPollingDelayMillis = initialPollingDelayMillis;
_this.maxPollingDelayMillis = maxPollingDelayMillis;
_this.masterTimeoutMillis = masterTimeoutMillis;
_this.numTries = 0;
_this.completed = false;
return _this;
}
/**
* Poll the provided callback with exponential backoff.
*
* @param callback - The callback to be called for each poll. If the
* callback resolves to a falsey value, polling will continue. Otherwise, the truthy
* resolution will be used to resolve the promise returned by this method.
* @returns A Promise which resolves to the truthy value returned by the provided
* callback when polling is complete.
*/
ExponentialBackoffPoller.prototype.poll = function (callback) {
var _this = this;
if (this.pollCallback) {
throw new Error('poll() can only be called once per instance of ExponentialBackoffPoller');
}
this.pollCallback = callback;
this.on('poll', this.repoll);
this.masterTimer = setTimeout(function () {
if (_this.completed) {
return;
}
_this.markCompleted();
_this.reject(new Error('ExponentialBackoffPoller deadline exceeded - Master timeout reached'));
}, this.masterTimeoutMillis);
return new Promise(function (resolve, reject) {
_this.resolve = resolve;
_this.reject = reject;
_this.repoll();
});
};
ExponentialBackoffPoller.prototype.repoll = function () {
var _this = this;
this.pollCallback()
.then(function (result) {
if (_this.completed) {
return;
}
if (!result) {
_this.repollTimer =
setTimeout(function () { return _this.emit('poll'); }, _this.getPollingDelayMillis());
_this.numTries++;
return;
}
_this.markCompleted();
_this.resolve(result);
})
.catch(function (err) {
if (_this.completed) {
return;
}
_this.markCompleted();
_this.reject(err);
});
};
ExponentialBackoffPoller.prototype.getPollingDelayMillis = function () {
var increasedPollingDelay = Math.pow(2, this.numTries) * this.initialPollingDelayMillis;
return Math.min(increasedPollingDelay, this.maxPollingDelayMillis);
};
ExponentialBackoffPoller.prototype.markCompleted = function () {
this.completed = true;
if (this.masterTimer) {
clearTimeout(this.masterTimer);
}
if (this.repollTimer) {
clearTimeout(this.repollTimer);
}
};
return ExponentialBackoffPoller;
}(events_1.EventEmitter));
exports.ExponentialBackoffPoller = ExponentialBackoffPoller;