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Copyright (c) .NET Foundation. All rights reserved.\r\n// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.\r\n\r\nimport { AbortController } from \"./AbortController\";\r\nimport { HttpError, TimeoutError } from \"./Errors\";\r\nimport { HttpClient, HttpRequest } from \"./HttpClient\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { ITransport, TransferFormat } from \"./ITransport\";\r\nimport { Arg, getDataDetail, sendMessage } from \"./Utils\";\r\n\r\nconst SHUTDOWN_TIMEOUT = 5 * 1000;\r\n\r\n// Not exported from 'index', this type is internal.\r\n/** @private */\r\nexport class LongPollingTransport implements ITransport {\r\n    private readonly httpClient: HttpClient;\r\n    private readonly accessTokenFactory: () => string | Promise<string>;\r\n    private readonly logger: ILogger;\r\n    private readonly logMessageContent: boolean;\r\n\r\n    private url: string;\r\n    private pollAbort: AbortController;\r\n    private shutdownTimer: any; // We use 'any' because this is an object in NodeJS. But it still gets passed to clearTimeout, so it doesn't really matter\r\n    private shutdownTimeout: number;\r\n    private running: boolean;\r\n    private stopped: boolean;\r\n\r\n    // This is an internal type, not exported from 'index' so this is really just internal.\r\n    public get pollAborted() {\r\n        return this.pollAbort.aborted;\r\n    }\r\n\r\n    constructor(httpClient: HttpClient, accessTokenFactory: () => string | Promise<string>, logger: ILogger, logMessageContent: boolean, shutdownTimeout?: number) {\r\n        this.httpClient = httpClient;\r\n        this.accessTokenFactory = accessTokenFactory || (() => null);\r\n        this.logger = logger;\r\n        this.pollAbort = new AbortController();\r\n        this.logMessageContent = logMessageContent;\r\n        this.shutdownTimeout = shutdownTimeout || SHUTDOWN_TIMEOUT;\r\n    }\r\n\r\n    public async connect(url: string, transferFormat: TransferFormat): Promise<void> {\r\n        Arg.isRequired(url, \"url\");\r\n        Arg.isRequired(transferFormat, \"transferFormat\");\r\n        Arg.isIn(transferFormat, TransferFormat, \"transferFormat\");\r\n\r\n        this.url = url;\r\n\r\n        this.logger.log(LogLevel.Trace, \"(LongPolling transport) Connecting\");\r\n\r\n        if (transferFormat === TransferFormat.Binary && (typeof new XMLHttpRequest().responseType !== \"string\")) {\r\n            // This will work if we fix: https://github.com/aspnet/SignalR/issues/742\r\n            throw new Error(\"Binary protocols over XmlHttpRequest not implementing advanced features are not supported.\");\r\n        }\r\n\r\n        const pollOptions: HttpRequest = {\r\n            abortSignal: this.pollAbort.signal,\r\n            headers: {},\r\n            timeout: 90000,\r\n        };\r\n\r\n        if (transferFormat === TransferFormat.Binary) {\r\n            pollOptions.responseType = \"arraybuffer\";\r\n        }\r\n\r\n        const token = await this.accessTokenFactory();\r\n        this.updateHeaderToken(pollOptions, token);\r\n\r\n        let closeError: Error;\r\n\r\n        // Make initial long polling request\r\n        // Server uses first long polling request to finish initializing connection and it returns without data\r\n        const pollUrl = `${url}&_=${Date.now()}`;\r\n        this.logger.log(LogLevel.Trace, `(LongPolling transport) polling: ${pollUrl}`);\r\n        const response = await this.httpClient.get(pollUrl, pollOptions);\r\n        if (response.statusCode !== 200) {\r\n            this.logger.log(LogLevel.Error, `(LongPolling transport) Unexpected response code: ${response.statusCode}`);\r\n\r\n            // Mark running as false so that the poll immediately ends and runs the close logic\r\n            closeError = new HttpError(response.statusText, response.statusCode);\r\n            this.running = false;\r\n        } else {\r\n            this.running = true;\r\n        }\r\n\r\n        // tslint:disable-next-line:no-floating-promises\r\n        this.poll(this.url, pollOptions, closeError);\r\n        return Promise.resolve();\r\n    }\r\n\r\n    private updateHeaderToken(request: HttpRequest, token: string) {\r\n        if (token) {\r\n            // tslint:disable-next-line:no-string-literal\r\n            request.headers[\"Authorization\"] = `Bearer ${token}`;\r\n            return;\r\n        }\r\n        // tslint:disable-next-line:no-string-literal\r\n        if (request.headers[\"Authorization\"]) {\r\n            // tslint:disable-next-line:no-string-literal\r\n            delete request.headers[\"Authorization\"];\r\n        }\r\n    }\r\n\r\n    private async poll(url: string, pollOptions: HttpRequest, closeError: Error): Promise<void> {\r\n        try {\r\n            while (this.running) {\r\n                // We have to get the access token on each poll, in case it changes\r\n                const token = await this.accessTokenFactory();\r\n                this.updateHeaderToken(pollOptions, token);\r\n\r\n                try {\r\n                    const pollUrl = `${url}&_=${Date.now()}`;\r\n                    this.logger.log(LogLevel.Trace, `(LongPolling transport) polling: ${pollUrl}`);\r\n                    const response = await this.httpClient.get(pollUrl, pollOptions);\r\n\r\n                    if (response.statusCode === 204) {\r\n                        this.logger.log(LogLevel.Information, \"(LongPolling transport) Poll terminated by server\");\r\n\r\n                        this.running = false;\r\n                    } else if (response.statusCode !== 200) {\r\n                        this.logger.log(LogLevel.Error, `(LongPolling transport) Unexpected response code: ${response.statusCode}`);\r\n\r\n                        // Unexpected status code\r\n                        closeError = new HttpError(response.statusText, response.statusCode);\r\n                        this.running = false;\r\n                    } else {\r\n                        // Process the response\r\n                        if (response.content) {\r\n                            this.logger.log(LogLevel.Trace, `(LongPolling transport) data received. ${getDataDetail(response.content, this.logMessageContent)}`);\r\n                            if (this.onreceive) {\r\n                                this.onreceive(response.content);\r\n                            }\r\n                        } else {\r\n                            // This is another way timeout manifest.\r\n                            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Poll timed out, reissuing.\");\r\n                        }\r\n                    }\r\n                } catch (e) {\r\n                    if (!this.running) {\r\n                        // Log but disregard errors that occur after we were stopped by DELETE\r\n                        this.logger.log(LogLevel.Trace, `(LongPolling transport) Poll errored after shutdown: ${e.message}`);\r\n                    } else {\r\n                        if (e instanceof TimeoutError) {\r\n                            // Ignore timeouts and reissue the poll.\r\n                            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Poll timed out, reissuing.\");\r\n                        } else {\r\n                            // Close the connection with the error as the result.\r\n                            closeError = e;\r\n                            this.running = false;\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        } finally {\r\n            // Indicate that we've stopped so the shutdown timer doesn't get registered.\r\n            this.stopped = true;\r\n\r\n            // Clean up the shutdown timer if it was registered\r\n            if (this.shutdownTimer) {\r\n                clearTimeout(this.shutdownTimer);\r\n            }\r\n\r\n            // Fire our onclosed event\r\n            if (this.onclose) {\r\n                this.logger.log(LogLevel.Trace, `(LongPolling transport) Firing onclose event. Error: ${closeError || \"<undefined>\"}`);\r\n                this.onclose(closeError);\r\n            }\r\n\r\n            this.logger.log(LogLevel.Trace, \"(LongPolling transport) Transport finished.\");\r\n        }\r\n    }\r\n\r\n    public async send(data: any): Promise<void> {\r\n        if (!this.running) {\r\n            return Promise.reject(new Error(\"Cannot send until the transport is connected\"));\r\n        }\r\n        return sendMessage(this.logger, \"LongPolling\", this.httpClient, this.url, this.accessTokenFactory, data, this.logMessageContent);\r\n    }\r\n\r\n    public async stop(): Promise<void> {\r\n        // Send a DELETE request to stop the poll\r\n        try {\r\n            this.running = false;\r\n            this.logger.log(LogLevel.Trace, `(LongPolling transport) sending DELETE request to ${this.url}.`);\r\n\r\n            const deleteOptions: HttpRequest = {\r\n                headers: {},\r\n            };\r\n            const token = await this.accessTokenFactory();\r\n            this.updateHeaderToken(deleteOptions, token);\r\n            await this.httpClient.delete(this.url, deleteOptions);\r\n\r\n            this.logger.log(LogLevel.Trace, \"(LongPolling transport) DELETE request accepted.\");\r\n        } finally {\r\n            // Abort the poll after the shutdown timeout if the server doesn't stop the poll.\r\n            if (!this.stopped) {\r\n                this.shutdownTimer = setTimeout(() => {\r\n                    this.logger.log(LogLevel.Warning, \"(LongPolling transport) server did not terminate after DELETE request, canceling poll.\");\r\n\r\n                    // Abort any outstanding poll\r\n                    this.pollAbort.abort();\r\n                }, this.shutdownTimeout);\r\n            }\r\n        }\r\n    }\r\n\r\n    public onreceive: (data: string | ArrayBuffer) => void;\r\n    public onclose: (error?: Error) => void;\r\n}\r\n"]}