| 1 | {"version":3,"file":"incoming-message-stream.js","names":["_bl","_interopRequireDefault","require","_stream","_message","_packet","_errors","obj","__esModule","default","IncomingMessageStream","Transform","constructor","debug","readableObjectMode","currentMessage","undefined","bl","BufferList","pause","resume","processBufferedData","callback","length","HEADER_LENGTH","readUInt16BE","ConnectionError","data","slice","consume","packet","Packet","message","Message","type","resetConnection","push","isLast","once","end","write","_transform","chunk","_encoding","append","_default","exports","module"],"sources":["../src/incoming-message-stream.ts"],"sourcesContent":["import BufferList from 'bl';\nimport { Transform } from 'stream';\n\nimport Debug from './debug';\nimport Message from './message';\nimport { Packet, HEADER_LENGTH } from './packet';\nimport { ConnectionError } from './errors';\n\n/**\n IncomingMessageStream\n Transform received TDS data into individual IncomingMessage streams.\n*/\nclass IncomingMessageStream extends Transform {\n declare debug: Debug;\n declare bl: any;\n declare currentMessage: Message | undefined;\n\n constructor(debug: Debug) {\n super({ readableObjectMode: true });\n\n this.debug = debug;\n\n this.currentMessage = undefined;\n this.bl = new BufferList();\n }\n\n pause() {\n super.pause();\n\n if (this.currentMessage) {\n this.currentMessage.pause();\n }\n\n return this;\n }\n\n resume() {\n super.resume();\n\n if (this.currentMessage) {\n this.currentMessage.resume();\n }\n\n return this;\n }\n\n processBufferedData(callback: (err?: ConnectionError) => void) {\n // The packet header is always 8 bytes of length.\n while (this.bl.length >= HEADER_LENGTH) {\n // Get the full packet length\n const length = this.bl.readUInt16BE(2);\n if (length < HEADER_LENGTH) {\n return callback(new ConnectionError('Unable to process incoming packet'));\n }\n\n if (this.bl.length >= length) {\n const data = this.bl.slice(0, length);\n this.bl.consume(length);\n\n // TODO: Get rid of creating `Packet` instances here.\n const packet = new Packet(data);\n this.debug.packet('Received', packet);\n this.debug.data(packet);\n\n let message = this.currentMessage;\n if (message === undefined) {\n this.currentMessage = message = new Message({ type: packet.type(), resetConnection: false });\n this.push(message);\n }\n\n if (packet.isLast()) {\n // Wait until the current message was fully processed before we\n // continue processing any remaining messages.\n message.once('end', () => {\n this.currentMessage = undefined;\n this.processBufferedData(callback);\n });\n message.end(packet.data());\n return;\n } else if (!message.write(packet.data())) {\n // If too much data is buffering up in the\n // current message, wait for it to drain.\n message.once('drain', () => {\n this.processBufferedData(callback);\n });\n return;\n }\n } else {\n break;\n }\n }\n\n // Not enough data to read the next packet. 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