node-datachannel/dist/esm/lib/datachannel-stream.mjs.map

WebRTC For Node.js and Electron. libdatachannel node bindings.

{"version":3,"file":"datachannel-stream.mjs","sources":["../../../src/lib/datachannel-stream.ts"],"sourcesContent":["/* eslint-disable @typescript-eslint/no-explicit-any */\nimport * as stream from 'stream';\n\n/**\n * Turns a node-datachannel DataChannel into a real Node.js stream, complete with buffering,\n * backpressure (up to a point - if the buffer fills up, messages are dropped), and\n * support for piping data elsewhere.\n *\n * Read & written data may be either UTF-8 strings or Buffers - this difference exists at\n * the protocol level, and is preserved here throughout.\n */\nexport default class DataChannelStream extends stream.Duplex {\n    private _rawChannel: any;\n    private _readActive: boolean;\n\n\n    constructor(rawChannel: any, streamOptions?: Omit<stream.DuplexOptions, 'objectMode'>) {\n        super({\n            allowHalfOpen: false, // Default to autoclose on end().\n            ...streamOptions,\n            objectMode: true, // Preserve the string/buffer distinction (WebRTC treats them differently)\n        });\n\n        this._rawChannel = rawChannel;\n        this._readActive = true;\n\n        rawChannel.onMessage((msg: any) => {\n            if (!this._readActive) return; // If the buffer is full, drop messages.\n\n            // If the push is rejected, we pause reading until the next call to _read().\n            this._readActive = this.push(msg);\n        });\n\n        // When the DataChannel closes, the readable & writable ends close\n        rawChannel.onClosed(() => {\n            this.push(null);\n            this.destroy();\n        });\n\n        rawChannel.onError((errMsg: string) => {\n            this.destroy(new Error(`DataChannel error: ${errMsg}`));\n        });\n\n        // Buffer all writes until the DataChannel opens\n        if (!rawChannel.isOpen()) {\n            this.cork();\n            rawChannel.onOpen(() => this.uncork());\n        }\n    }\n\n    _read(): void {\n        // Stop dropping messages, if the buffer filling up meant we were doing so before.\n        this._readActive = true;\n    }\n\n    _write(chunk, _encoding, callback): void {\n        let sentOk;\n\n        try {\n            if (Buffer.isBuffer(chunk)) {\n                sentOk = this._rawChannel.sendMessageBinary(chunk);\n            } else if (typeof chunk === 'string') {\n                sentOk = this._rawChannel.sendMessage(chunk);\n            } else {\n                const typeName = chunk.constructor.name || typeof chunk;\n                throw new Error(`Cannot write ${typeName} to DataChannel stream`);\n            }\n        } catch (err) {\n            return callback(err);\n        }\n\n        if (sentOk) {\n            callback(null);\n        } else {\n            callback(new Error('Failed to write to DataChannel'));\n        }\n    }\n\n    _final(callback): void {\n        if (!this.allowHalfOpen) this.destroy();\n        callback(null);\n    }\n\n    _destroy(maybeErr, callback): void {\n        // When the stream is destroyed, we close the DataChannel.\n        this._rawChannel.close();\n        callback(maybeErr);\n    }\n\n    get label(): string {\n        return this._rawChannel.getLabel();\n    }\n\n    get id(): number {\n        return this._rawChannel.getId();\n    }\n\n    get protocol(): string {\n        return this._rawChannel.getProtocol();\n    }\n}\n"],"names":[],"mappings":";;;;;AAWqB,MAAA,iBAAA,SAA0B,OAAO,MAAO,CAAA;AAAA,EAKzD,WAAA,CAAY,YAAiB,aAA0D,EAAA;AACnF,IAAM,KAAA,CAAA;AAAA,MACF,aAAe,EAAA,KAAA;AAAA;AAAA,MACf,GAAG,aAAA;AAAA,MACH,UAAY,EAAA,IAAA;AAAA;AAAA,KACf,CAAA,CAAA;AATL,IAAQ,aAAA,CAAA,IAAA,EAAA,aAAA,CAAA,CAAA;AACR,IAAQ,aAAA,CAAA,IAAA,EAAA,aAAA,CAAA,CAAA;AAUJ,IAAA,IAAA,CAAK,WAAc,GAAA,UAAA,CAAA;AACnB,IAAA,IAAA,CAAK,WAAc,GAAA,IAAA,CAAA;AAEnB,IAAW,UAAA,CAAA,SAAA,CAAU,CAAC,GAAa,KAAA;AAC/B,MAAI,IAAA,CAAC,KAAK,WAAa,EAAA,OAAA;AAGvB,MAAK,IAAA,CAAA,WAAA,GAAc,IAAK,CAAA,IAAA,CAAK,GAAG,CAAA,CAAA;AAAA,KACnC,CAAA,CAAA;AAGD,IAAA,UAAA,CAAW,SAAS,MAAM;AACtB,MAAA,IAAA,CAAK,KAAK,IAAI,CAAA,CAAA;AACd,MAAA,IAAA,CAAK,OAAQ,EAAA,CAAA;AAAA,KAChB,CAAA,CAAA;AAED,IAAW,UAAA,CAAA,OAAA,CAAQ,CAAC,MAAmB,KAAA;AACnC,MAAA,IAAA,CAAK,QAAQ,IAAI,KAAA,CAAM,CAAsB,mBAAA,EAAA,MAAM,EAAE,CAAC,CAAA,CAAA;AAAA,KACzD,CAAA,CAAA;AAGD,IAAI,IAAA,CAAC,UAAW,CAAA,MAAA,EAAU,EAAA;AACtB,MAAA,IAAA,CAAK,IAAK,EAAA,CAAA;AACV,MAAA,UAAA,CAAW,MAAO,CAAA,MAAM,IAAK,CAAA,MAAA,EAAQ,CAAA,CAAA;AAAA,KACzC;AAAA,GACJ;AAAA,EAEA,KAAc,GAAA;AAEV,IAAA,IAAA,CAAK,WAAc,GAAA,IAAA,CAAA;AAAA,GACvB;AAAA,EAEA,MAAA,CAAO,KAAO,EAAA,SAAA,EAAW,QAAgB,EAAA;AACrC,IAAI,IAAA,MAAA,CAAA;AAEJ,IAAI,IAAA;AACA,MAAI,IAAA,MAAA,CAAO,QAAS,CAAA,KAAK,CAAG,EAAA;AACxB,QAAS,MAAA,GAAA,IAAA,CAAK,WAAY,CAAA,iBAAA,CAAkB,KAAK,CAAA,CAAA;AAAA,OACrD,MAAA,IAAW,OAAO,KAAA,KAAU,QAAU,EAAA;AAClC,QAAS,MAAA,GAAA,IAAA,CAAK,WAAY,CAAA,WAAA,CAAY,KAAK,CAAA,CAAA;AAAA,OACxC,MAAA;AACH,QAAA,MAAM,QAAW,GAAA,KAAA,CAAM,WAAY,CAAA,IAAA,IAAQ,OAAO,KAAA,CAAA;AAClD,QAAA,MAAM,IAAI,KAAA,CAAM,CAAgB,aAAA,EAAA,QAAQ,CAAwB,sBAAA,CAAA,CAAA,CAAA;AAAA,OACpE;AAAA,aACK,GAAK,EAAA;AACV,MAAA,OAAO,SAAS,GAAG,CAAA,CAAA;AAAA,KACvB;AAEA,IAAA,IAAI,MAAQ,EAAA;AACR,MAAA,QAAA,CAAS,IAAI,CAAA,CAAA;AAAA,KACV,MAAA;AACH,MAAS,QAAA,CAAA,IAAI,KAAM,CAAA,gCAAgC,CAAC,CAAA,CAAA;AAAA,KACxD;AAAA,GACJ;AAAA,EAEA,OAAO,QAAgB,EAAA;AACnB,IAAA,IAAI,CAAC,IAAA,CAAK,aAAe,EAAA,IAAA,CAAK,OAAQ,EAAA,CAAA;AACtC,IAAA,QAAA,CAAS,IAAI,CAAA,CAAA;AAAA,GACjB;AAAA,EAEA,QAAA,CAAS,UAAU,QAAgB,EAAA;AAE/B,IAAA,IAAA,CAAK,YAAY,KAAM,EAAA,CAAA;AACvB,IAAA,QAAA,CAAS,QAAQ,CAAA,CAAA;AAAA,GACrB;AAAA,EAEA,IAAI,KAAgB,GAAA;AAChB,IAAO,OAAA,IAAA,CAAK,YAAY,QAAS,EAAA,CAAA;AAAA,GACrC;AAAA,EAEA,IAAI,EAAa,GAAA;AACb,IAAO,OAAA,IAAA,CAAK,YAAY,KAAM,EAAA,CAAA;AAAA,GAClC;AAAA,EAEA,IAAI,QAAmB,GAAA;AACnB,IAAO,OAAA,IAAA,CAAK,YAAY,WAAY,EAAA,CAAA;AAAA,GACxC;AACJ;;;;"}