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Declare key/value format for CONSUMER in kafka file
Fixes jlandersen#112 Signed-off-by: azerr <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| export type MessageFormat = "none" | "double" | "float" | "integer" | "long" | "short"; | ||
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| export type SerializationdResult = any | Error; | ||
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| class SerializationException extends Error { } | ||
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| // ---------------- Deserializers ---------------- | ||
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| interface Deserializer { | ||
| deserialize(data: Buffer): any; | ||
| } | ||
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| const deserializerRegistry: Map<MessageFormat, Deserializer> = new Map(); | ||
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| export function deserialize(data: Buffer | null, format?: MessageFormat): SerializationdResult | null { | ||
| if (data === null || !format || format === "none") { | ||
| return null; | ||
| } | ||
| try { | ||
| const deserializer = getDeserializer(format); | ||
| if (!deserializer) { | ||
| throw new SerializationException(`Cannot find a deserializer for ${format} format.`); | ||
| } | ||
| return deserializer.deserialize(data); | ||
| } | ||
| catch (e) { | ||
| return e; | ||
| } | ||
| } | ||
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| function getDeserializer(format: MessageFormat): Deserializer | undefined { | ||
| return deserializerRegistry.get(format); | ||
| } | ||
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| class DoubleDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| if (data.length !== 8) { | ||
| throw new SerializationException("Size of data received by Deserializer is not 8"); | ||
| } | ||
| return data.readDoubleBE(0); | ||
| } | ||
| } | ||
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| class FloatDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| if (data.length !== 4) { | ||
| throw new SerializationException("Size of data received by Deserializer is not 4"); | ||
| } | ||
| return data.readFloatBE(0); | ||
| } | ||
| } | ||
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| class IntegerDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| if (data.length !== 4) { | ||
| throw new Error("Size of data received by IntegerDeserializer is not 4"); | ||
| } | ||
| return data.readUInt32BE(0); | ||
| } | ||
| } | ||
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| class LongDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| if (data.length !== 8) { | ||
| throw new SerializationException("Size of data received by LongDeserializer is not 8"); | ||
| } | ||
| /*let value = 0; | ||
| for (const b of data) { | ||
| value <<= 8; | ||
| value |= b & 0xFF; | ||
| } | ||
| return value;*/ | ||
| return data.readBigUInt64BE(0); | ||
| } | ||
| } | ||
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| class ShortDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| if (data.length !== 2) { | ||
| throw new SerializationException("Size of data received by ShortDeserializer is not 2"); | ||
| } | ||
| return data.readUInt16BE(0); | ||
| } | ||
| } | ||
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| deserializerRegistry.set("double", new DoubleDeserializer()); | ||
| deserializerRegistry.set("float", new FloatDeserializer()); | ||
| deserializerRegistry.set("integer", new IntegerDeserializer()); | ||
| deserializerRegistry.set("long", new LongDeserializer()); | ||
| deserializerRegistry.set("short", new ShortDeserializer()); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| import * as assert from "assert"; | ||
| import { deserialize } from "../../../client/serialization"; | ||
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| suite("Deserializer Test Suite", () => { | ||
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| test("Integer deserializer", () => { | ||
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| assert.deepStrictEqual( | ||
| deserialize(Buffer.from([0, 0, 0, 123]), "integer"), | ||
| 123 | ||
| ); | ||
| }); | ||
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| /*test("Long deserializer", () => { | ||
| assert.deepStrictEqual( | ||
| deserialize(Buffer.from([0, 0, 0, 123, 0, 0, 0, 123]), "long"), | ||
| 123 | ||
| ); | ||
| });*/ | ||
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| }); |
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