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"sourcesContent":["// Copyright (c) Microsoft Corporation.\n// Licensed under the MIT license.\n\n// TODO: Do a review of the Object usage and non-interfaces\n/* eslint-disable @typescript-eslint/ban-types, @azure/azure-sdk/ts-use-interface-parameters */\n\nimport { AbortSignalLike } from \"@azure/abort-controller\";\nimport { AvroReadable } from \"./AvroReadable\";\nimport { KeyValuePair } from \"./utils/utils.common\";\n\n/**\n * Options to configure the AvroParser read methods.\n * See {@link AvroParser.readFixedBytes}, {@link AvroParser.readMap} and etc.\n */\ninterface AvroParserReadOptions {\n /**\n * An implementation of the `AbortSignalLike` interface to signal the request to cancel the operation.\n * For example, use the @azure/abort-controller to create an `AbortSignal`.\n */\n abortSignal?: AbortSignalLike;\n}\n\nexport class AvroParser {\n /**\n * Reads a fixed number of bytes from the stream.\n *\n * @param stream -\n * @param length -\n * @param options -\n */\n public static async readFixedBytes(\n stream: AvroReadable,\n length: number,\n options: AvroParserReadOptions = {}\n ): Promise<Uint8Array> {\n const bytes = await stream.read(length, { abortSignal: options.abortSignal });\n if (bytes.length !== length) {\n throw new Error(\"Hit stream end.\");\n }\n return bytes;\n }\n\n /**\n * Reads a single byte from the stream.\n *\n * @param stream -\n * @param options -\n */\n private static async readByte(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n const buf = await AvroParser.readFixedBytes(stream, 1, options);\n return buf[0];\n }\n\n // int and long are stored in variable-length zig-zag coding.\n // variable-length: https://lucene.apache.org/core/3_5_0/fileformats.html#VInt\n // zig-zag: https://developers.google.com/protocol-buffers/docs/encoding?csw=1#types\n private static async readZigZagLong(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n let zigZagEncoded = 0;\n let significanceInBit = 0;\n let byte, haveMoreByte, significanceInFloat;\n\n do {\n byte = await AvroParser.readByte(stream, options);\n haveMoreByte = byte & 0x80;\n zigZagEncoded |= (byte & 0x7f) << significanceInBit;\n significanceInBit += 7;\n } while (haveMoreByte && significanceInBit < 28); // bitwise operation only works for 32-bit integers\n\n if (haveMoreByte) {\n // Switch to float arithmetic\n // eslint-disable-next-line no-self-assign\n zigZagEncoded = zigZagEncoded;\n significanceInFloat = 268435456; // 2 ** 28.\n do {\n byte = await AvroParser.readByte(stream, options);\n zigZagEncoded += (byte & 0x7f) * significanceInFloat;\n significanceInFloat *= 128; // 2 ** 7\n } while (byte & 0x80);\n\n const res = (zigZagEncoded % 2 ? -(zigZagEncoded + 1) : zigZagEncoded) / 2;\n if (res < Number.MIN_SAFE_INTEGER || res > Number.MAX_SAFE_INTEGER) {\n throw new Error(\"Integer overflow.\");\n }\n return res;\n }\n\n return (zigZagEncoded >> 1) ^ -(zigZagEncoded & 1);\n }\n\n public static async readLong(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n return AvroParser.readZigZagLong(stream, options);\n }\n\n public static async readInt(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n return AvroParser.readZigZagLong(stream, options);\n }\n\n public static async readNull(): Promise<null> {\n return null;\n }\n\n public static async readBoolean(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<boolean> {\n const b = await AvroParser.readByte(stream, options);\n if (b === 1) {\n return true;\n } else if (b === 0) {\n return false;\n } else {\n throw new Error(\"Byte was not a boolean.\");\n }\n }\n\n public static async readFloat(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n const u8arr = await AvroParser.readFixedBytes(stream, 4, options);\n const view = new DataView(u8arr.buffer, u8arr.byteOffset, u8arr.byteLength);\n return view.getFloat32(0, true); // littleEndian = true\n }\n\n public static async readDouble(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<number> {\n const u8arr = await AvroParser.readFixedBytes(stream, 8, options);\n const view = new DataView(u8arr.buffer, u8arr.byteOffset, u8arr.byteLength);\n return view.getFloat64(0, true); // littleEndian = true\n }\n\n public static async readBytes(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<Uint8Array> {\n const size = await AvroParser.readLong(stream, options);\n if (size < 0) {\n throw new Error(\"Bytes size was negative.\");\n }\n\n return stream.read(size, { abortSignal: options.abortSignal });\n }\n\n public static async readString(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<string> {\n const u8arr = await AvroParser.readBytes(stream, options);\n const utf8decoder = new TextDecoder();\n return utf8decoder.decode(u8arr);\n }\n\n private static async readMapPair<T>(\n stream: AvroReadable,\n readItemMethod: (s: AvroReadable, options?: AvroParserReadOptions) => Promise<T>,\n options: AvroParserReadOptions = {}\n ): Promise<KeyValuePair<T>> {\n const key = await AvroParser.readString(stream, options);\n // FUTURE: this won't work with readFixed (currently not supported) which needs a length as the parameter.\n const value = await readItemMethod(stream, options);\n return { key, value };\n }\n\n public static async readMap<T>(\n stream: AvroReadable,\n readItemMethod: (s: AvroReadable, options?: AvroParserReadOptions) => Promise<T>,\n options: AvroParserReadOptions = {}\n ): Promise<Record<string, T>> {\n const readPairMethod = (\n s: AvroReadable,\n opts: AvroParserReadOptions = {}\n ): Promise<KeyValuePair<T>> => {\n return AvroParser.readMapPair(s, readItemMethod, opts);\n };\n\n const pairs: KeyValuePair<T>[] = await AvroParser.readArray(stream, readPairMethod, options);\n\n const dict: Record<string, T> = {};\n for (const pair of pairs) {\n dict[pair.key] = pair.value;\n }\n return dict;\n }\n\n private static async readArray<T>(\n stream: AvroReadable,\n readItemMethod: (s: AvroReadable, options?: AvroParserReadOptions) => Promise<T>,\n options: AvroParserReadOptions = {}\n ): Promise<T[]> {\n const items: T[] = [];\n for (\n let count = await AvroParser.readLong(stream, options);\n count !== 0;\n count = await AvroParser.readLong(stream, options)\n ) {\n if (count < 0) {\n // Ignore block sizes\n await AvroParser.readLong(stream, options);\n count = -count;\n }\n\n while (count--) {\n const item: T = await readItemMethod(stream, options);\n items.push(item);\n }\n }\n return items;\n }\n}\n\ninterface RecordField {\n name: string;\n type: string | ObjectSchema | (string | ObjectSchema)[]; // Unions may not immediately contain other unions.\n}\n\nenum AvroComplex {\n RECORD = \"record\",\n ENUM = \"enum\",\n ARRAY = \"array\",\n MAP = \"map\",\n UNION = \"union\",\n FIXED = \"fixed\",\n}\n\ninterface ObjectSchema {\n type: Exclude<AvroComplex, AvroComplex.UNION>;\n name?: string;\n aliases?: string;\n fields?: RecordField[];\n symbols?: string[];\n values?: string;\n size?: number;\n}\n\nenum AvroPrimitive {\n NULL = \"null\",\n BOOLEAN = \"boolean\",\n INT = \"int\",\n LONG = \"long\",\n FLOAT = \"float\",\n DOUBLE = \"double\",\n BYTES = \"bytes\",\n STRING = \"string\",\n}\n\nexport abstract class AvroType {\n /**\n * Reads an object from the stream.\n */\n public abstract read(\n stream: AvroReadable,\n options?: AvroParserReadOptions\n ): Promise<Object | null>; // eslint-disable-line @typescript-eslint/ban-types\n\n /**\n * Determines the AvroType from the Avro Schema.\n */\n public static fromSchema(schema: string | Object): AvroType {\n if (typeof schema === \"string\") {\n return AvroType.fromStringSchema(schema);\n } else if (Array.isArray(schema)) {\n return AvroType.fromArraySchema(schema);\n } else {\n return AvroType.fromObjectSchema(schema as ObjectSchema);\n }\n }\n\n private static fromStringSchema(schema: string): AvroType {\n switch (schema) {\n case AvroPrimitive.NULL:\n case AvroPrimitive.BOOLEAN:\n case AvroPrimitive.INT:\n case AvroPrimitive.LONG:\n case AvroPrimitive.FLOAT:\n case AvroPrimitive.DOUBLE:\n case AvroPrimitive.BYTES:\n case AvroPrimitive.STRING:\n return new AvroPrimitiveType(schema as AvroPrimitive);\n default:\n throw new Error(`Unexpected Avro type ${schema}`);\n }\n }\n\n private static fromArraySchema(schema: any[]): AvroType {\n return new AvroUnionType(schema.map(AvroType.fromSchema));\n }\n\n private static fromObjectSchema(schema: ObjectSchema): AvroType {\n const type = schema.type;\n // Primitives can be defined as strings or objects\n try {\n return AvroType.fromStringSchema(type);\n } catch (err: any) {\n // eslint-disable-line no-empty\n }\n\n switch (type) {\n case AvroComplex.RECORD:\n if (schema.aliases) {\n throw new Error(`aliases currently is not supported, schema: ${schema}`);\n }\n if (!schema.name) {\n throw new Error(`Required attribute 'name' doesn't exist on schema: ${schema}`);\n }\n\n // eslint-disable-next-line no-case-declarations\n const fields: Record<string, AvroType> = {};\n if (!schema.fields) {\n throw new Error(`Required attribute 'fields' doesn't exist on schema: ${schema}`);\n }\n for (const field of schema.fields) {\n fields[field.name] = AvroType.fromSchema(field.type);\n }\n return new AvroRecordType(fields, schema.name);\n case AvroComplex.ENUM:\n if (schema.aliases) {\n throw new Error(`aliases currently is not supported, schema: ${schema}`);\n }\n if (!schema.symbols) {\n throw new Error(`Required attribute 'symbols' doesn't exist on schema: ${schema}`);\n }\n return new AvroEnumType(schema.symbols);\n case AvroComplex.MAP:\n if (!schema.values) {\n throw new Error(`Required attribute 'values' doesn't exist on schema: ${schema}`);\n }\n return new AvroMapType(AvroType.fromSchema(schema.values));\n case AvroComplex.ARRAY: // Unused today\n case AvroComplex.FIXED: // Unused today\n default:\n throw new Error(`Unexpected Avro type ${type} in ${schema}`);\n }\n }\n}\n\nclass AvroPrimitiveType extends AvroType {\n private _primitive: AvroPrimitive;\n\n constructor(primitive: AvroPrimitive) {\n super();\n this._primitive = primitive;\n }\n\n public read(stream: AvroReadable, options: AvroParserReadOptions = {}): Promise<Object | null> {\n switch (this._primitive) {\n case AvroPrimitive.NULL:\n return AvroParser.readNull();\n case AvroPrimitive.BOOLEAN:\n return AvroParser.readBoolean(stream, options);\n case AvroPrimitive.INT:\n return AvroParser.readInt(stream, options);\n case AvroPrimitive.LONG:\n return AvroParser.readLong(stream, options);\n case AvroPrimitive.FLOAT:\n return AvroParser.readFloat(stream, options);\n case AvroPrimitive.DOUBLE:\n return AvroParser.readDouble(stream, options);\n case AvroPrimitive.BYTES:\n return AvroParser.readBytes(stream, options);\n case AvroPrimitive.STRING:\n return AvroParser.readString(stream, options);\n default:\n throw new Error(\"Unknown Avro Primitive\");\n }\n }\n}\n\nclass AvroEnumType extends AvroType {\n private readonly _symbols: string[];\n\n constructor(symbols: string[]) {\n super();\n this._symbols = symbols;\n }\n\n public async read(stream: AvroReadable, options: AvroParserReadOptions = {}): Promise<Object> {\n const value = await AvroParser.readInt(stream, options);\n return this._symbols[value];\n }\n}\n\nclass AvroUnionType extends AvroType {\n private readonly _types: AvroType[];\n\n constructor(types: AvroType[]) {\n super();\n this._types = types;\n }\n\n public async read(\n stream: AvroReadable,\n options: AvroParserReadOptions = {}\n ): Promise<Object | null> {\n // eslint-disable-line @typescript-eslint/ban-types\n const typeIndex = await AvroParser.readInt(stream, options);\n return this._types[typeIndex].read(stream, options);\n }\n}\n\nclass AvroMapType extends AvroType {\n private readonly _itemType: AvroType;\n\n constructor(itemType: AvroType) {\n super();\n this._itemType = itemType;\n }\n\n public read(stream: AvroReadable, options: AvroParserReadOptions = {}): Promise<Object> {\n const readItemMethod = (\n s: AvroReadable,\n opts?: AvroParserReadOptions\n ): Promise<Object | null> => {\n return this._itemType.read(s, opts);\n };\n return AvroParser.readMap(stream, readItemMethod, options);\n }\n}\n\nclass AvroRecordType extends AvroType {\n private readonly _name: string;\n private readonly _fields: Record<string, AvroType>;\n\n constructor(fields: Record<string, AvroType>, name: string) {\n super();\n this._fields = fields;\n this._name = name;\n }\n\n public async read(stream: AvroReadable, options: AvroParserReadOptions = {}): Promise<Object> {\n const record: Record<string, Object | null> = {};\n record[\"$schema\"] = this._name;\n for (const key in this._fields) {\n if (Object.prototype.hasOwnProperty.call(this._fields, key)) {\n record[key] = await this._fields[key].read(stream, options);\n }\n }\n return record;\n }\n}\n"]} |