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// 1MB in bytes\nconst MAX_ATTRIBUTES = 255;\nconst MAX_ATTRIBUTE_NAME_LENGTH = 255;\nconst MAX_ATTRIBUTE_VALUE_LENGTH = 4094;\n\n/**\n * Error thrown when log entry validation fails.\n * This includes payload size, attribute count, and attribute name length validations.\n */\nclass ValidationError extends Error {\n constructor(message: string) {\n super(message);\n this.name = \"ValidationError\";\n }\n}\n\n/**\n * Error thrown when New Relic's API rate limit is exceeded.\n * Contains the retry-after duration specified by the API.\n */\nclass RateLimitError extends Error {\n constructor(\n message: string,\n public retryAfter: number,\n ) {\n super(message);\n this.name = \"RateLimitError\";\n }\n}\n\n/**\n * Configuration options for the New Relic transport.\n */\nexport interface NewRelicTransportConfig extends LoggerlessTransportConfig {\n /**\n * The New Relic API key\n */\n apiKey: string;\n /**\n * The New Relic Log API endpoint\n * @default https://log-api.newrelic.com/log/v1\n */\n endpoint?: string;\n /**\n * Optional callback for error handling\n */\n onError?: (err: Error) => void;\n /**\n * Optional callback for debugging log entries before they are sent\n */\n onDebug?: (entry: Record) => void;\n /**\n * Whether to use gzip compression\n * @default true\n */\n useCompression?: boolean;\n /**\n * Number of retry attempts before giving up\n * @default 3\n */\n maxRetries?: number;\n /**\n * Base delay between retries in milliseconds\n * @default 1000\n */\n retryDelay?: number;\n /**\n * Whether to respect rate limiting by waiting when a 429 response is received\n * @default true\n */\n respectRateLimit?: boolean;\n}\n\n/**\n * Validates a log entry against New Relic's constraints.\n * - Checks number of attributes (max 255)\n * - Validates attribute name length (max 255 characters)\n * - Truncates attribute values longer than 4094 characters\n *\n * @param logEntry - The log entry to validate\n * @returns The validated (and potentially modified) log entry\n * @throws {ValidationError} If validation fails\n */\nfunction validateLogEntry(logEntry: Record) {\n if (logEntry.attributes) {\n // Check number of attributes\n const attributeCount = Object.keys(logEntry.attributes).length;\n if (attributeCount > MAX_ATTRIBUTES) {\n throw new ValidationError(\n `Log entry exceeds maximum number of attributes (${MAX_ATTRIBUTES}). Found: ${attributeCount}`,\n );\n }\n\n // Check attribute names and values\n for (const [key, value] of Object.entries(logEntry.attributes)) {\n // Check attribute name length\n if (key.length > MAX_ATTRIBUTE_NAME_LENGTH) {\n throw new ValidationError(\n `Attribute name '${key}' exceeds maximum length (${MAX_ATTRIBUTE_NAME_LENGTH}). Length: ${key.length}`,\n );\n }\n\n // Check string value length\n if (typeof value === \"string\" && value.length > MAX_ATTRIBUTE_VALUE_LENGTH) {\n // Truncate the string value to the maximum length\n logEntry.attributes[key] = value.slice(0, MAX_ATTRIBUTE_VALUE_LENGTH);\n }\n }\n }\n\n return logEntry;\n}\n\n/**\n * NewRelicTransport is responsible for sending logs to New Relic's Log API.\n * It handles validation, compression, retries, and rate limiting according to New Relic's specifications.\n *\n * Features:\n * - Validates payload size (max 1MB)\n * - Validates number of attributes (max 255)\n * - Validates attribute name length (max 255 characters)\n * - Truncates attribute values longer than 4094 characters\n * - Supports gzip compression\n * - Handles rate limiting with configurable behavior\n * - Implements retry logic with exponential backoff\n */\nexport class NewRelicTransport extends LoggerlessTransport {\n private apiKey: string;\n private endpoint: string;\n private onError?: (err: Error) => void;\n private onDebug?: (entry: Record) => void;\n private useCompression: boolean;\n private maxRetries: number;\n private retryDelay: number;\n private respectRateLimit: boolean;\n\n /**\n * Creates a new instance of NewRelicTransport.\n *\n * @param config - Configuration options for the transport\n * @param config.apiKey - New Relic API key for authentication\n * @param config.endpoint - Optional custom endpoint URL (defaults to New Relic's Log API endpoint)\n * @param config.onError - Optional error callback for handling errors\n * @param config.onDebug - Optional callback for debugging log entries before they are sent\n * @param config.useCompression - Whether to use gzip compression (defaults to true)\n * @param config.maxRetries - Maximum number of retry attempts (defaults to 3)\n * @param config.retryDelay - Base delay between retries in milliseconds (defaults to 1000)\n * @param config.respectRateLimit - Whether to honor rate limiting headers (defaults to true)\n */\n constructor(config: NewRelicTransportConfig) {\n super(config);\n\n this.apiKey = config.apiKey;\n this.endpoint = config.endpoint ?? \"https://log-api.newrelic.com/log/v1\";\n this.onError = config.onError;\n this.onDebug = config.onDebug;\n this.useCompression = config.useCompression ?? true;\n this.maxRetries = config.maxRetries ?? 3;\n this.retryDelay = config.retryDelay ?? 1000;\n this.respectRateLimit = config.respectRateLimit ?? true;\n }\n\n /**\n * Processes and ships log entries to New Relic.\n *\n * This method:\n * 1. Validates the message size\n * 2. Creates and validates the log entry\n * 3. Validates the final payload size\n * 4. Asynchronously sends the log entry to New Relic\n *\n * The actual sending is done asynchronously in a fire-and-forget manner to maintain\n * compatibility with the base transport class while still providing retry and error handling.\n *\n * @param params - Log parameters including level, messages, and metadata\n * @param params.logLevel - The severity level of the log\n * @param params.messages - Array of message strings to be joined\n * @param params.data - Optional metadata to include with the log\n * @param params.hasData - Whether metadata is present\n * @returns The original messages array\n * @throws {ValidationError} If the payload exceeds size limits or validation fails\n */\n shipToLogger({ logLevel, messages, data, hasData }: LogLayerTransportParams): any[] {\n try {\n // Check message size first\n const message = messages.join(\" \");\n const messageBytes = new TextEncoder().encode(message).length;\n if (messageBytes > MAX_PAYLOAD_SIZE) {\n throw new ValidationError(\n `Payload size exceeds maximum of ${MAX_PAYLOAD_SIZE} bytes. Size: ${messageBytes} bytes`,\n );\n }\n\n const logEntry: Record = {\n timestamp: Date.now(),\n level: logLevel,\n log: message,\n };\n\n if (data && hasData) {\n Object.assign(logEntry, {\n attributes: data,\n });\n }\n\n const validatedEntry = validateLogEntry(logEntry);\n\n // Call onDebug callback if defined\n if (this.onDebug) {\n this.onDebug(validatedEntry);\n }\n\n // Check final payload size\n const payload = JSON.stringify([validatedEntry]);\n const payloadBytes = new TextEncoder().encode(payload).length;\n if (payloadBytes > MAX_PAYLOAD_SIZE) {\n throw new ValidationError(\n `Payload size exceeds maximum of ${MAX_PAYLOAD_SIZE} bytes. Size: ${payloadBytes} bytes`,\n );\n }\n\n // Fire and forget the async processing\n (async () => {\n try {\n await sendWithRetry(\n this.endpoint,\n this.apiKey,\n payload,\n this.useCompression,\n this.maxRetries,\n this.retryDelay,\n this.respectRateLimit,\n );\n } catch (error) {\n if (this.onError) {\n this.onError(error instanceof Error ? error : new Error(String(error)));\n }\n // Re-throw validation errors to prevent further processing\n if (error instanceof ValidationError) {\n throw error;\n }\n }\n })();\n } catch (error) {\n if (this.onError) {\n this.onError(error instanceof Error ? error : new Error(String(error)));\n }\n }\n\n return messages;\n }\n}\n\n/**\n * Compresses data using gzip compression.\n *\n * @param data - The string data to compress\n * @returns A promise that resolves to the compressed data as a Uint8Array\n */\nasync function compressData(data: string): Promise {\n const stream = new CompressionStream(\"gzip\");\n const writer = stream.writable.getWriter();\n const encoder = new TextEncoder();\n const chunks: Uint8Array[] = [];\n\n await writer.write(encoder.encode(data));\n await writer.close();\n\n const reader = stream.readable.getReader();\n\n while (true) {\n const { value, done } = await reader.read();\n if (done) break;\n chunks.push(value);\n }\n\n // Combine all chunks into a single Uint8Array\n const totalLength = chunks.reduce((acc, chunk) => acc + chunk.length, 0);\n const result = new Uint8Array(totalLength);\n let offset = 0;\n for (const chunk of chunks) {\n result.set(chunk, offset);\n offset += chunk.length;\n }\n\n return result;\n}\n\n/**\n * Sends a log entry to New Relic with retry logic.\n * Handles rate limiting, compression, and error cases.\n *\n * @param endpoint - The New Relic API endpoint\n * @param apiKey - The New Relic API key\n * @param payload - The JSON payload to send\n * @param useCompression - Whether to use gzip compression\n * @param maxRetries - Maximum number of retry attempts\n * @param retryDelay - Base delay between retries in milliseconds\n * @param respectRateLimit - Whether to honor rate limiting headers\n * @returns A promise that resolves to the API response\n * @throws {ValidationError} If payload validation fails\n * @throws {RateLimitError} If rate limited and not respecting rate limits\n * @throws {Error} If the request fails after all retries\n */\nasync function sendWithRetry(\n endpoint: string,\n apiKey: string,\n payload: string,\n useCompression: boolean,\n maxRetries: number,\n retryDelay: number,\n respectRateLimit = true,\n): Promise {\n // Check payload size before compression\n const payloadBytes = new TextEncoder().encode(payload).length;\n if (payloadBytes > MAX_PAYLOAD_SIZE) {\n throw new ValidationError(`Payload size exceeds maximum of ${MAX_PAYLOAD_SIZE} bytes. Size: ${payloadBytes} bytes`);\n }\n\n let lastError: Error;\n let compressedPayload: Uint8Array | undefined;\n\n if (useCompression) {\n compressedPayload = await compressData(payload);\n // Check compressed payload size\n if (compressedPayload.length > MAX_PAYLOAD_SIZE) {\n throw new ValidationError(\n `Compressed payload size exceeds maximum of ${MAX_PAYLOAD_SIZE} bytes. Size: ${compressedPayload.length} bytes`,\n );\n }\n }\n\n const headers: Record = {\n \"Content-Type\": \"application/json\",\n \"Api-Key\": apiKey,\n };\n\n if (useCompression) {\n headers[\"Content-Encoding\"] = \"gzip\";\n }\n\n for (let attempt = 0; attempt <= maxRetries; attempt++) {\n try {\n const response = await fetch(endpoint, {\n method: \"POST\",\n headers,\n body: useCompression ? compressedPayload : payload,\n });\n\n if (response.status === 429) {\n const retryAfter = Number.parseInt(response.headers.get(\"Retry-After\") || \"60\", 10);\n if (respectRateLimit) {\n // Wait for the specified time before retrying\n await new Promise((resolve) => setTimeout(resolve, retryAfter * 1000));\n // Don't count rate limit retries against maxRetries\n attempt--;\n continue;\n }\n\n throw new RateLimitError(`Rate limit exceeded. Retry after ${retryAfter} seconds`, retryAfter);\n }\n\n if (!response.ok) {\n throw new Error(`Failed to send logs to New Relic: ${response.statusText}`);\n }\n\n return response;\n } catch (error) {\n lastError = error instanceof Error ? error : new Error(String(error));\n\n // Don't retry validation errors\n if (error instanceof ValidationError) {\n throw error;\n }\n\n // If we're not respecting rate limits, don't retry rate limit errors\n if (!respectRateLimit && error instanceof RateLimitError) {\n throw error;\n }\n\n if (attempt === maxRetries) {\n throw new Error(`Failed to send logs after ${maxRetries} retries: ${lastError.message}`);\n }\n\n // For non-rate-limit errors, use exponential backoff with jitter\n if (!(error instanceof RateLimitError)) {\n const jitter = Math.random() * 200;\n const delay = retryDelay * 2 ** attempt + jitter;\n await new Promise((resolve) => setTimeout(resolve, delay));\n }\n }\n }\n\n throw lastError!;\n}\n"]}