@eventmsg/core/dist/protocol.cjs.map

EventMsgV3 TypeScript library - Core protocol implementation with transport abstraction

{"version":3,"file":"protocol.cjs","names":["DEFAULT_PROTOCOL_OPTIONS","getLogger","stuff","MessageSizeError","CONTROL_CHARS","hexDump","EncodingError","InvalidMessageError","unstuff","DecodingError"],"sources":["../src/protocol.ts"],"sourcesContent":["import {\n  DecodingError,\n  EncodingError,\n  InvalidMessageError,\n} from \"./errors/protocol-error.js\";\nimport { MessageSizeError } from \"./errors/validation-error.js\";\nimport { CONTROL_CHARS, stuff, unstuff } from \"./internal/byte-stuffing.js\";\nimport { getLogger, hexDump } from \"./internal/logger.js\";\nimport type { EventMsgConfig, ProtocolOptions } from \"./types/config.js\";\nimport { DEFAULT_PROTOCOL_OPTIONS } from \"./types/config.js\";\nimport type { MessageHeader } from \"./types/message.js\";\n\n/**\n * Decoded message structure\n */\nexport interface DecodedMessage {\n  header: MessageHeader;\n  eventName: string;\n  eventData: string;\n}\n\n/**\n * EventMsgV3 Protocol Implementation\n *\n * Handles encoding and decoding of EventMsgV3 binary protocol messages.\n * Message format: [SOH][StuffedHeader][STX][StuffedEventName][US][StuffedEventData][EOT]\n */\nexport class Protocol {\n  private readonly options: Required<ProtocolOptions>;\n  private readonly encoding: \"utf8\" | \"binary\";\n  private readonly logger: ReturnType<typeof getLogger>;\n\n  constructor(config: EventMsgConfig) {\n    this.options = { ...DEFAULT_PROTOCOL_OPTIONS, ...config.protocol };\n    this.encoding = config.encoding ?? \"utf8\";\n    this.logger = getLogger(\"PROTOCOL\");\n  }\n\n  /**\n   * Encode a message into EventMsgV3 binary format\n   *\n   * @param header Message header (7 bytes)\n   * @param eventName Event name string\n   * @param eventData Event data string (JSON)\n   * @returns Encoded binary message\n   * @throws {EncodingError} If encoding fails\n   * @throws {MessageSizeError} If message exceeds size limits\n   */\n  encode(\n    header: MessageHeader,\n    eventName: string,\n    eventData: string\n  ): Uint8Array {\n    this.logger.debug(\"Starting message encode\", {\n      eventName,\n      eventDataLength: eventData.length,\n      header,\n      encoding: this.encoding,\n    });\n\n    try {\n      // Validate inputs\n      this.validateHeader(header);\n      this.validateEventName(eventName);\n      this.validateEventData(eventData);\n\n      // Convert strings to bytes\n      const eventNameBytes = this.stringToBytes(eventName);\n      const eventDataBytes = this.stringToBytes(eventData);\n\n      // Serialize header (7 bytes, big-endian messageId)\n      const headerBytes = this.serializeHeader(header);\n\n      // Apply byte stuffing to each section\n      const stuffedHeader = stuff(headerBytes);\n      const stuffedEventName = stuff(eventNameBytes);\n      const stuffedEventData = stuff(eventDataBytes);\n\n      this.logger.trace(\"Byte stuffing complete\", {\n        headerSize: `${headerBytes.length} -> ${stuffedHeader.length}`,\n        nameSize: `${eventNameBytes.length} -> ${stuffedEventName.length}`,\n        dataSize: `${eventDataBytes.length} -> ${stuffedEventData.length}`,\n      });\n\n      // Calculate total message size\n      const totalSize =\n        1 +\n        stuffedHeader.length +\n        1 +\n        stuffedEventName.length +\n        1 +\n        stuffedEventData.length +\n        1;\n\n      if (totalSize > this.options.maxEventDataLength + 1000) {\n        // Allow some overhead\n        throw new MessageSizeError(\n          totalSize,\n          this.options.maxEventDataLength + 1000,\n          \"encoded message\"\n        );\n      }\n\n      // Build final message: [SOH][StuffedHeader][STX][StuffedEventName][US][StuffedEventData][EOT]\n      const message = new Uint8Array(totalSize);\n      let offset = 0;\n\n      // SOH\n      message[offset++] = CONTROL_CHARS.SOH;\n\n      // Stuffed Header\n      message.set(stuffedHeader, offset);\n      offset += stuffedHeader.length;\n\n      // STX\n      message[offset++] = CONTROL_CHARS.STX;\n\n      // Stuffed Event Name\n      message.set(stuffedEventName, offset);\n      offset += stuffedEventName.length;\n\n      // US\n      message[offset++] = CONTROL_CHARS.US;\n\n      // Stuffed Event Data\n      message.set(stuffedEventData, offset);\n      offset += stuffedEventData.length;\n\n      // EOT\n      message[offset++] = CONTROL_CHARS.EOT;\n\n      const finalMessage = message.subarray(0, offset);\n\n      this.logger.info(\"Message encoded successfully\", {\n        eventName,\n        finalSize: finalMessage.length,\n        messageId: header.messageId,\n      });\n\n      this.logger.trace(\"Encoded message hex dump\", {\n        hex: hexDump(finalMessage),\n      });\n\n      return finalMessage;\n    } catch (error) {\n      this.logger.error(\"Message encoding failed\", {\n        error: error instanceof Error ? error.message : String(error),\n        eventName,\n        eventDataLength: eventData.length,\n        cause: error instanceof Error ? error.name : \"Unknown\",\n      });\n\n      if (error instanceof MessageSizeError) {\n        throw error;\n      }\n      throw new EncodingError(\"Failed to encode EventMsgV3 message\", {\n        context: { eventName, eventDataLength: eventData.length },\n        cause: error instanceof Error ? error : new Error(String(error)),\n      });\n    }\n  }\n\n  /**\n   * Encode a message with binary data into EventMsgV3 format\n   *\n   * @param header Message header (7 bytes)\n   * @param eventName Event name string\n   * @param eventData Binary event data\n   * @returns Encoded binary message\n   * @throws {EncodingError} If encoding fails\n   * @throws {MessageSizeError} If message exceeds size limits\n   */\n  encodeBinary(\n    header: MessageHeader,\n    eventName: string,\n    eventData: Uint8Array\n  ): Uint8Array {\n    this.logger.debug(\"Starting binary message encode\", {\n      eventName,\n      eventDataLength: eventData.length,\n      header,\n    });\n\n    try {\n      this.validateHeader(header);\n      this.validateEventName(eventName);\n\n      if (eventData.length > this.options.maxEventDataLength) {\n        throw new MessageSizeError(\n          eventData.length,\n          this.options.maxEventDataLength,\n          \"eventData\"\n        );\n      }\n\n      const eventNameBytes = this.stringToBytes(eventName);\n      const headerBytes = this.serializeHeader(header);\n\n      const stuffedHeader = stuff(headerBytes);\n      const stuffedEventName = stuff(eventNameBytes);\n      const stuffedEventData = stuff(eventData);\n\n      this.logger.trace(\"Binary byte stuffing complete\", {\n        headerSize: `${headerBytes.length} -> ${stuffedHeader.length}`,\n        nameSize: `${eventNameBytes.length} -> ${stuffedEventName.length}`,\n        dataSize: `${eventData.length} -> ${stuffedEventData.length}`,\n      });\n\n      const totalSize =\n        1 +\n        stuffedHeader.length +\n        1 +\n        stuffedEventName.length +\n        1 +\n        stuffedEventData.length +\n        1;\n\n      if (totalSize > this.options.maxEventDataLength + 1000) {\n        throw new MessageSizeError(\n          totalSize,\n          this.options.maxEventDataLength + 1000,\n          \"encoded message\"\n        );\n      }\n\n      const message = new Uint8Array(totalSize);\n      let offset = 0;\n\n      message[offset++] = CONTROL_CHARS.SOH;\n      message.set(stuffedHeader, offset);\n      offset += stuffedHeader.length;\n\n      message[offset++] = CONTROL_CHARS.STX;\n      message.set(stuffedEventName, offset);\n      offset += stuffedEventName.length;\n\n      message[offset++] = CONTROL_CHARS.US;\n      message.set(stuffedEventData, offset);\n      offset += stuffedEventData.length;\n\n      message[offset++] = CONTROL_CHARS.EOT;\n\n      const finalMessage = message.subarray(0, offset);\n\n      this.logger.info(\"Binary message encoded successfully\", {\n        eventName,\n        finalSize: finalMessage.length,\n        messageId: header.messageId,\n      });\n\n      this.logger.trace(\"Encoded binary message hex dump\", {\n        hex: hexDump(finalMessage),\n      });\n\n      return finalMessage;\n    } catch (error) {\n      this.logger.error(\"Binary message encoding failed\", {\n        error: error instanceof Error ? error.message : String(error),\n        eventName,\n        eventDataLength: eventData.length,\n        cause: error instanceof Error ? error.name : \"Unknown\",\n      });\n\n      if (error instanceof MessageSizeError) {\n        throw error;\n      }\n      throw new EncodingError(\"Failed to encode EventMsgV3 binary message\", {\n        context: {\n          eventName,\n          eventDataLength: eventData.length,\n        },\n        cause: error instanceof Error ? error : new Error(String(error)),\n      });\n    }\n  }\n\n  /**\n   * Decode a binary message into EventMsgV3 components\n   *\n   * @param data Binary message data\n   * @returns Decoded message components\n   * @throws {DecodingError} If decoding fails\n   * @throws {InvalidMessageError} If message format is invalid\n   */\n  decode(data: Uint8Array): DecodedMessage {\n    this.logger.debug(\"Starting message decode\", {\n      messageLength: data.length,\n      encoding: this.encoding,\n    });\n\n    this.logger.trace(\"Incoming message hex dump\", {\n      hex: hexDump(data),\n    });\n\n    try {\n      // Validate minimum message length (SOH + header + STX + name + US + data + EOT)\n      if (data.length < 10) {\n        throw new InvalidMessageError(\n          `Message too short: ${data.length} bytes (minimum 10)`,\n          { context: { messageLength: data.length } }\n        );\n      }\n\n      // Validate framing characters\n      if (data[0] !== CONTROL_CHARS.SOH) {\n        throw new InvalidMessageError(\n          `Message must start with SOH (0x01), got 0x${data[0]?.toString(16).padStart(2, \"0\")}`,\n          { context: { firstByte: data[0] } }\n        );\n      }\n\n      if (data.at(-1) !== CONTROL_CHARS.EOT) {\n        throw new InvalidMessageError(\n          `Message must end with EOT (0x04), got 0x${data.at(-1)?.toString(16).padStart(2, \"0\")}`,\n          { context: { lastByte: data.at(-1) } }\n        );\n      }\n\n      // Find section boundaries\n      const stxIndex = this.findControlChar(data, CONTROL_CHARS.STX, 1);\n      const usIndex = this.findControlChar(\n        data,\n        CONTROL_CHARS.US,\n        stxIndex + 1\n      );\n\n      if (stxIndex === -1) {\n        throw new InvalidMessageError(\"STX (0x02) not found in message\");\n      }\n      if (usIndex === -1) {\n        throw new InvalidMessageError(\"US (0x1F) not found in message\");\n      }\n\n      // Extract and unstuff sections\n      const stuffedHeader = data.subarray(1, stxIndex);\n      const stuffedEventName = data.subarray(stxIndex + 1, usIndex);\n      const stuffedEventData = data.subarray(usIndex + 1, data.length - 1);\n\n      const headerBytes = unstuff(stuffedHeader);\n      const eventNameBytes = unstuff(stuffedEventName);\n      const eventDataBytes = unstuff(stuffedEventData);\n\n      this.logger.trace(\"Byte unstuffing complete\", {\n        headerSize: `${stuffedHeader.length} -> ${headerBytes.length}`,\n        nameSize: `${stuffedEventName.length} -> ${eventNameBytes.length}`,\n        dataSize: `${stuffedEventData.length} -> ${eventDataBytes.length}`,\n      });\n\n      // Parse components\n      const header = this.deserializeHeader(headerBytes);\n      const eventName = this.bytesToString(eventNameBytes);\n      const eventData = this.bytesToString(eventDataBytes);\n\n      // Validate decoded components\n      if (this.options.strictValidation) {\n        this.validateHeader(header);\n        this.validateEventName(eventName);\n        this.validateEventData(eventData);\n      }\n\n      this.logger.info(\"Message decoded successfully\", {\n        eventName,\n        messageId: header.messageId,\n        senderId: header.senderId,\n        receiverId: header.receiverId,\n        eventDataLength: eventData.length,\n      });\n\n      return { header, eventName, eventData };\n    } catch (error) {\n      this.logger.error(\"Message decoding failed\", {\n        error: error instanceof Error ? error.message : String(error),\n        messageLength: data.length,\n\n        cause: error instanceof Error ? error.name : \"Unknown\",\n        hex: hexDump(data, 64),\n      });\n\n      if (error instanceof InvalidMessageError) {\n        throw error;\n      }\n      throw new DecodingError(\"Failed to decode EventMsgV3 message\", {\n        context: { messageLength: data.length },\n        cause: error instanceof Error ? error : new Error(String(error)),\n      });\n    }\n  }\n\n  /**\n   * Find a control character in data, skipping escaped instances\n   */\n  private findControlChar(\n    data: Uint8Array,\n    target: number,\n    startIndex: number\n  ): number {\n    let escaped = false;\n\n    for (let i = startIndex; i < data.length; i++) {\n      const byte = data[i];\n      if (byte === undefined) {\n        continue;\n      }\n\n      if (escaped) {\n        escaped = false;\n      } else if (byte === CONTROL_CHARS.ESC) {\n        escaped = true;\n      } else if (byte === target) {\n        return i;\n      }\n    }\n\n    return -1;\n  }\n\n  /**\n   * Serialize message header to 7 bytes (big-endian messageId)\n   */\n  private serializeHeader(header: MessageHeader): Uint8Array {\n    const bytes = new Uint8Array(7);\n    bytes[0] = header.senderId;\n    bytes[1] = header.receiverId;\n    bytes[2] = header.senderGroupId;\n    bytes[3] = header.receiverGroupId;\n    bytes[4] = header.flags;\n    bytes[5] = (header.messageId >> 8) & 0xff; // MSB\n    bytes[6] = header.messageId & 0xff; // LSB\n    return bytes;\n  }\n\n  /**\n   * Deserialize 7 bytes to message header (big-endian messageId)\n   */\n  private deserializeHeader(bytes: Uint8Array): MessageHeader {\n    if (bytes.length !== 7) {\n      throw new InvalidMessageError(\n        `Header must be exactly 7 bytes, got ${bytes.length}`,\n        { context: { headerLength: bytes.length } }\n      );\n    }\n\n    if (\n      bytes[0] === undefined ||\n      bytes[1] === undefined ||\n      bytes[2] === undefined ||\n      bytes[3] === undefined ||\n      bytes[4] === undefined ||\n      bytes[5] === undefined ||\n      bytes[6] === undefined\n    ) {\n      throw new InvalidMessageError(\n        `Header must be exactly 7 bytes, got ${bytes.length}`,\n        { context: { headerLength: bytes.length } }\n      );\n    }\n\n    return {\n      senderId: bytes[0],\n      receiverId: bytes[1],\n      senderGroupId: bytes[2],\n      receiverGroupId: bytes[3],\n      flags: bytes[4],\n      messageId: (bytes[5] << 8) | bytes[6], // Big-endian\n    };\n  }\n\n  /**\n   * Convert string to bytes using configured encoding\n   */\n  private stringToBytes(str: string): Uint8Array {\n    if (this.encoding === \"utf8\") {\n      return new TextEncoder().encode(str);\n    }\n    // Binary encoding - each character is a byte\n    const bytes = new Uint8Array(str.length);\n    for (let i = 0; i < str.length; i++) {\n      bytes[i] = str.charCodeAt(i) & 0xff;\n    }\n    return bytes;\n  }\n\n  /**\n   * Convert bytes to string using configured encoding\n   */\n  private bytesToString(bytes: Uint8Array): string {\n    if (this.encoding === \"utf8\") {\n      return new TextDecoder(\"utf8\").decode(bytes);\n    }\n    // Binary encoding - each byte is a character\n    return String.fromCharCode(...bytes);\n  }\n\n  /**\n   * Validate message header fields\n   */\n  private validateHeader(header: MessageHeader): void {\n    const fields = [\n      { name: \"senderId\", value: header.senderId },\n      { name: \"receiverId\", value: header.receiverId },\n      { name: \"senderGroupId\", value: header.senderGroupId },\n      { name: \"receiverGroupId\", value: header.receiverGroupId },\n      { name: \"flags\", value: header.flags },\n    ];\n\n    for (const field of fields) {\n      if (\n        field.value < 0 ||\n        field.value > 255 ||\n        !Number.isInteger(field.value)\n      ) {\n        throw new MessageSizeError(field.value, 255, field.name, {\n          context: { validRange: \"0-255\" },\n        });\n      }\n    }\n\n    if (\n      header.messageId < 0 ||\n      header.messageId > 65_535 ||\n      !Number.isInteger(header.messageId)\n    ) {\n      throw new MessageSizeError(header.messageId, 65_535, \"messageId\", {\n        context: { validRange: \"0-65535\" },\n      });\n    }\n  }\n\n  /**\n   * Validate event name length\n   */\n  private validateEventName(eventName: string): void {\n    const bytes = this.stringToBytes(eventName);\n    if (bytes.length > this.options.maxEventNameLength) {\n      throw new MessageSizeError(\n        bytes.length,\n        this.options.maxEventNameLength,\n        \"eventName\"\n      );\n    }\n  }\n\n  /**\n   * Validate event data length\n   */\n  private validateEventData(eventData: string): void {\n    const bytes = this.stringToBytes(eventData);\n    if (bytes.length > this.options.maxEventDataLength) {\n      throw new MessageSizeError(\n        bytes.length,\n        this.options.maxEventDataLength,\n        \"eventData\"\n      );\n    }\n  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