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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 +1,118 @@ | ||
| export type MessageFormat = "none" | "string" | "double" | "float" | "integer" | "long" | "short" ; | ||
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| export type SerializationdResult = any | Error; | ||
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| export 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) { | ||
| return null; | ||
| } | ||
| if (format === "none") { | ||
| return ''; | ||
| } | ||
| 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 DoubleDeserializer 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 FloatDeserializer 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.readInt32BE(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"); | ||
| } | ||
| return data.readBigInt64BE(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.readInt16BE(0); | ||
| } | ||
| } | ||
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| class StringDeserializer implements Deserializer { | ||
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| deserialize(data: Buffer | null): any { | ||
| if (data === null) { | ||
| return null; | ||
| } | ||
| return data.toString(); | ||
| } | ||
| } | ||
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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()); | ||
| deserializerRegistry.set("string", new StringDeserializer()); |
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