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* Copyright The OpenTelemetry Authors\n * SPDX-License-Identifier: Apache-2.0\n */\nimport type * as http from 'http';\nimport type * as https from 'https';\nimport * as zlib from 'zlib';\nimport { Readable } from 'stream';\nimport type { ExportResponse } from '../export-response';\nimport {\n isExportHTTPErrorRetryable,\n parseRetryAfterToMills,\n} from '../is-export-retryable';\nimport { OTLPExporterError } from '../types';\nimport { VERSION } from '../version';\n\nconst DEFAULT_USER_AGENT = `OTel-OTLP-Exporter-JavaScript/${VERSION}`;\n\n/**\n * Maximum response body size (4 MB) that the HTTP transport will read.\n * If the server sends more data the connection is destroyed and the export\n * is treated as a non-retryable error regardless of status code.\n */\nexport const MAX_RESPONSE_BODY_SIZE = 4 * 1024 * 1024;\n\n/**\n * Sends data using http\n * @param request\n * @param url\n * @param headers\n * @param compression\n * @param userAgent\n * @param agent\n * @param data\n * @param timeoutMillis\n */\nexport function sendWithHttp(\n request: typeof https.request | typeof http.request,\n url: string,\n headers: Record,\n compression: 'gzip' | 'none',\n userAgent: string | undefined,\n agent: http.Agent | https.Agent,\n data: Uint8Array,\n timeoutMillis: number\n): Promise {\n return new Promise(resolve => {\n const parsedUrl = new URL(url);\n\n if (userAgent) {\n headers['User-Agent'] = `${userAgent} ${DEFAULT_USER_AGENT}`;\n } else {\n headers['User-Agent'] = DEFAULT_USER_AGENT;\n }\n\n const options: http.RequestOptions | https.RequestOptions = {\n hostname: parsedUrl.hostname,\n port: parsedUrl.port,\n path: parsedUrl.pathname,\n method: 'POST',\n headers,\n agent,\n };\n\n const req = request(options, (res: http.IncomingMessage) => {\n const responseData: Buffer[] = [];\n let responseSize = 0;\n res.on('data', (chunk: Buffer) => {\n responseSize += chunk.length;\n if (responseSize > MAX_RESPONSE_BODY_SIZE) {\n const sizeError = new Error(\n `OTLP export response body exceeded size limit of ${MAX_RESPONSE_BODY_SIZE} bytes`\n );\n // Oversized responses are treated as non-retryable errors\n // regardless of status code.\n // Resolve before destroying: res.destroy() tears down the socket which\n // triggers ECONNRESET on req.on('error'), so, resolving first makes that\n // a no-op. res.on('error') does not fire because destroy() is called\n // without an error argument.\n resolve({ status: 'failure', error: sizeError });\n res.destroy();\n return;\n }\n responseData.push(chunk);\n });\n\n res.on('end', () => {\n if (res.statusCode && res.statusCode <= 299) {\n resolve({\n status: 'success',\n data: Buffer.concat(responseData),\n });\n } else if (\n res.statusCode &&\n isExportHTTPErrorRetryable(res.statusCode)\n ) {\n resolve({\n status: 'retryable',\n retryInMillis: parseRetryAfterToMills(res.headers['retry-after']),\n });\n } else {\n const error = new OTLPExporterError(\n res.statusMessage,\n res.statusCode,\n Buffer.concat(responseData).toString()\n );\n resolve({\n status: 'failure',\n error,\n });\n }\n });\n\n res.on('error', (error: Error) => {\n // Note: 'end' may still be emitted after 'error' on the same response object, since we're resolving a promise,\n // the first call to resolve() will determine the final state.\n if (res.statusCode && res.statusCode <= 299) {\n // If the response is successful but an error occurs while reading the response,\n // we consider it a success since the data has been sent successfully.\n resolve({\n status: 'success',\n });\n } else if (\n res.statusCode &&\n isExportHTTPErrorRetryable(res.statusCode)\n ) {\n resolve({\n status: 'retryable',\n error: error,\n retryInMillis: parseRetryAfterToMills(res.headers['retry-after']),\n });\n } else {\n resolve({\n status: 'failure',\n error,\n });\n }\n });\n });\n\n req.setTimeout(timeoutMillis, () => {\n req.destroy();\n resolve({\n status: 'retryable',\n error: new Error('Request timed out'),\n });\n });\n\n req.on('error', (error: Error) => {\n if (isHttpTransportNetworkErrorRetryable(error)) {\n resolve({\n status: 'retryable',\n error,\n });\n } else {\n resolve({\n status: 'failure',\n error,\n });\n }\n });\n\n compressAndSend(req, compression, data, (error: Error) => {\n resolve({\n status: 'failure',\n error,\n });\n });\n });\n}\n\nexport function compressAndSend(\n req: http.ClientRequest,\n compression: 'gzip' | 'none',\n data: Uint8Array,\n onError: (error: Error) => void\n) {\n let dataStream = readableFromUint8Array(data);\n\n if (compression === 'gzip') {\n req.setHeader('Content-Encoding', 'gzip');\n dataStream = dataStream\n .on('error', onError)\n .pipe(zlib.createGzip())\n .on('error', onError);\n }\n\n dataStream.pipe(req).on('error', onError);\n}\n\nfunction readableFromUint8Array(buff: string | Uint8Array): Readable {\n const readable = new Readable();\n readable.push(buff);\n readable.push(null);\n\n return readable;\n}\n\nfunction isHttpTransportNetworkErrorRetryable(error: Error): boolean {\n const RETRYABLE_NETWORK_ERROR_CODES = new Set([\n 'ECONNRESET',\n 'ECONNREFUSED',\n 'EPIPE',\n 'ETIMEDOUT',\n 'EAI_AGAIN',\n 'ENOTFOUND',\n 'ENETUNREACH',\n 'EHOSTUNREACH',\n ]);\n\n if ('code' in error && typeof error.code === 'string') {\n return RETRYABLE_NETWORK_ERROR_CODES.has(error.code);\n }\n\n return false;\n}\n"]}