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Support for local Avro schema in CONSUMER/PRODUCER of kafka-file
Fixes jlandersen#114 Signed-off-by: azerr <[email protected]>
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# Serialization | ||
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* A PRODUCER can serialize `key/value` by declaring the proper serializer with `key-format/value-format` property. | ||
* A CONSUMER can deserialize `key/value` by declaring the proper deserializer for `key-format/value-format` property. | ||
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## Basic serialization | ||
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### Basic serializer | ||
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The serializers can have the following value: | ||
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* `string`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.StringSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/StringSerializer.java). By default it supports `UTF-8` encoding, but you can specify the encoding as parameter like this `string(base64)`. The valid encoding values are defined in [Node.js' buffers and character encodings](https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings). | ||
* `double`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.DoubleSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/DoubleSerializer.java). | ||
* `float`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.FloatSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/FloatSerializer.java). | ||
* `integer`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.IntegerSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/IntegerSerializer.java). | ||
* `long`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.LongSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/LongSerializer.java). | ||
* `short`: similar serializer to the Kafka Java client [org.apache.kafka.common.serialization.ShortSerializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/ShortSerializer.java). | ||
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### Basic deserializer | ||
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The deserializers can have the following value: | ||
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* `none`: no deserializer (ignores content). | ||
* `string`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.StringDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/StringDeserializer.java). By default it supports `UTF-8` encoding, but you can specify the encoding as parameter like this `string(base64)`. The valid encoding values are defined in [Node.js' buffers and character encodings](https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings). | ||
* `double`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.DoubleDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/DoubleDeserializer.java). | ||
* `float`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.FloatDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/FloatDeserializer.java). | ||
* `integer`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.IntegerDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/IntegerDeserializer.java). | ||
* `long`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.LongDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/LongDeserializer.java). | ||
* `short`: similar deserializer to the Kafka Java client [org.apache.kafka.common.serialization.ShortDeserializer](https://github.com/apache/kafka/blob/master/clients/src/main/java/org/apache/kafka/common/serialization/ShortDeserializer.java). | ||
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## Avro serialization | ||
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Serialization can be done too with [Apache Avro Schema](http://avro.apache.org/docs/current/spec.html) with a local Avro Schema `*.avsc` | ||
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For instance you can create an [Apache Avro](http://avro.apache.org/docs/current/spec.html) Schema `animals.avsc`: | ||
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```json | ||
{ | ||
"type": "record", | ||
"fields": [ | ||
{ | ||
"name": "kind", | ||
"type": { | ||
"name": "animals_type", | ||
"type": "enum", | ||
"symbols": [ | ||
"CAT", | ||
"DOG" | ||
] | ||
} | ||
}, | ||
{ | ||
"name": "name", | ||
"type": "string" | ||
} | ||
] | ||
} | ||
``` | ||
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and bind it with `avro(path/of/animals.avsc)` in `key-format` / `value-format`. Path is resolved following those strategies: | ||
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* `file:///` a given file path (ex : `avro(file:///C:/path/of/animals.avsc)`. | ||
* `/` relative path to the kafka file (ex : `avro(/path/of/animals.avsc)`. | ||
* otherwise relative path to the workspace folder of kafka file (ex : `avro(path/of/animals.avsc)`. | ||
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### Avro Schema support | ||
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`*.avsc` files benefit with completion, validation for Avro specification. | ||
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### Avro serializer | ||
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You can serialize value of produced message by using the Avro schema `animals.avsc` like this: | ||
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``` | ||
PRODUCER json-output | ||
topic: topic_name | ||
value-format: avro(animals.avsc) | ||
{"kind": "CAT", "name": "Albert"} | ||
### | ||
``` | ||
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### Avro deserializer | ||
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You can deserialize value of consummed message by using the Avro schema `animals.avsc` like this: | ||
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``` | ||
CONSUMER consumer-group-id | ||
topic: topic_name | ||
from: earliest | ||
value-format: avro(animals.avsc) | ||
``` |
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{ | ||
"$schema": "http://json-schema.org/draft-06/schema#", | ||
"title": "Avro Schema Definition", | ||
"description": "Json-Schema definition for Avro AVSC files.", | ||
"definitions": { | ||
"avroSchema": { | ||
"title": "Avro Schema", | ||
"description": "Root Schema", | ||
"oneOf": [ | ||
{ "$ref": "#/definitions/types" } | ||
] | ||
}, | ||
"types": { | ||
"title": "Avro Types", | ||
"description": "Allowed Avro types", | ||
"oneOf": [ | ||
{ "$ref": "#/definitions/primitiveType" }, | ||
{ "$ref": "#/definitions/primitiveTypeWithMetadata" }, | ||
{ "$ref": "#/definitions/customTypeReference" }, | ||
{ "$ref": "#/definitions/avroRecord" }, | ||
{ "$ref": "#/definitions/avroEnum" }, | ||
{ "$ref": "#/definitions/avroArray" }, | ||
{ "$ref": "#/definitions/avroMap" }, | ||
{ "$ref": "#/definitions/avroFixed" }, | ||
{ "$ref": "#/definitions/avroUnion" } | ||
] | ||
}, | ||
"primitiveType": { | ||
"title": "Primitive Type", | ||
"description": "Basic type primitives.", | ||
"type":"string", | ||
"enum": [ | ||
"null", | ||
"boolean", | ||
"int", | ||
"long", | ||
"float", | ||
"double", | ||
"bytes", | ||
"string" | ||
] | ||
}, | ||
"primitiveTypeWithMetadata": { | ||
"title": "Primitive Type With Metadata", | ||
"description": "A primitive type with metadata attached.", | ||
"type": "object", | ||
"properties": { | ||
"type": { "$ref": "#/definitions/primitiveType" } | ||
}, | ||
"required": ["type"] | ||
}, | ||
"customTypeReference": { | ||
"title": "Custom Type", | ||
"description": "Reference to a ComplexType", | ||
"not": { "$ref": "#/definitions/primitiveType" }, | ||
"type": "string", | ||
"pattern": "^[A-Za-z_][A-Za-z0-9_]*(\\.[A-Za-z_][A-Za-z0-9_]*)*$" | ||
}, | ||
"avroUnion": { | ||
"title": "Union", | ||
"description": "A Union of types", | ||
"type": "array", | ||
"items": { "$ref": "#/definitions/avroSchema" }, | ||
"minItems": 1 | ||
}, | ||
"avroField": { | ||
"title": "Field", | ||
"description": "A field within a Record", | ||
"type": "object", | ||
"properties": { | ||
"name": { "$ref": "#/definitions/name" }, | ||
"type": { "$ref": "#/definitions/types" }, | ||
"doc": { "type": "string" }, | ||
"default": { }, | ||
"order": { "enum": ["ascending", "descending", "ignore"] }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } } | ||
}, | ||
"required": ["name", "type"] | ||
}, | ||
"avroRecord": { | ||
"title": "Record", | ||
"description": "A Record", | ||
"type": "object", | ||
"properties": { | ||
"type": {"type":"string", "enum": ["record"]}, | ||
"name": { "$ref": "#/definitions/name" }, | ||
"namespace": { "$ref": "#/definitions/namespace" }, | ||
"doc": { "type": "string" }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } }, | ||
"fields": { "type": "array", "items": { "$ref": "#/definitions/avroField" } } | ||
}, | ||
"required": ["type", "name", "fields"] | ||
}, | ||
"avroEnum": { | ||
"title": "Enum", | ||
"description": "An enumeration", | ||
"type": "object", | ||
"properties": { | ||
"type": {"type":"string", "enum": ["enum"]}, | ||
"name": { "$ref": "#/definitions/name" }, | ||
"namespace": { "$ref": "#/definitions/namespace" }, | ||
"doc": { "type": "string" }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } }, | ||
"symbols": { "type": "array", "items": { "$ref": "#/definitions/name" } } | ||
}, | ||
"required": ["type", "name", "symbols"] | ||
}, | ||
"avroArray": { | ||
"title": "Array", | ||
"description": "An array", | ||
"type": "object", | ||
"properties": { | ||
"type": {"type":"string", "enum": ["array"]}, | ||
"name": { "$ref": "#/definitions/name" }, | ||
"namespace": { "$ref": "#/definitions/namespace" }, | ||
"doc": { "type": "string" }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } }, | ||
"items": { "$ref": "#/definitions/types" } | ||
}, | ||
"required": ["type", "items"] | ||
}, | ||
"avroMap": { | ||
"title": "Map", | ||
"description": "A map of values", | ||
"type": "object", | ||
"properties": { | ||
"type": {"type":"string", "enum": ["map"]}, | ||
"name": { "$ref": "#/definitions/name" }, | ||
"namespace": { "$ref": "#/definitions/namespace" }, | ||
"doc": { "type": "string" }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } }, | ||
"values": { "$ref": "#/definitions/types" } | ||
}, | ||
"required": ["type", "values"] | ||
}, | ||
"avroFixed": { | ||
"title": "Fixed", | ||
"description": "A fixed sized array of bytes", | ||
"type": "object", | ||
"properties": { | ||
"type": {"type":"string", "enum": ["fixed"]}, | ||
"name": { "$ref": "#/definitions/name" }, | ||
"namespace": { "$ref": "#/definitions/namespace" }, | ||
"doc": { "type": "string" }, | ||
"aliases": { "type": "array", "items": { "$ref": "#/definitions/name" } }, | ||
"size": {"type":"number"} | ||
}, | ||
"required": ["type", "name", "size"] | ||
}, | ||
"name": { | ||
"type": "string", | ||
"pattern": "^[A-Za-z_][A-Za-z0-9_]*$" | ||
}, | ||
"namespace": { | ||
"type": "string", | ||
"pattern": "^([A-Za-z_][A-Za-z0-9_]*(\\.[A-Za-z_][A-Za-z0-9_]*)*)*$" | ||
} | ||
}, | ||
"oneOf": [ | ||
{ "$ref": "#/definitions/avroSchema" } | ||
] | ||
} |
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