avro-schema-builder

avro-schema-builder

A robust and feature-rich package for building Avro Schema definitions.

Description

avro-schema-builder is a convenient way of programmatically building Avro Schemas. With the help of TypeScript type definitions, this library provides a type-safe and self-documenting way of creating Avro schemas, without dealing with JSON files or worrying about schema validation or learning the depth of Avro specific representation like defaults and object nesting.

Install

yarn add avro-schema-builder

npm install avro-schema-builder

Usage

import {AvroSchemaBuilder, PrimitiveField, PrimitiveType} from 'avro-schema-builder';

new AvroSchemaBuilder('myRecord')
  .record('record.record')
  .addField(
    new RecordField({
      namespace: 'record.primitive.x',
      name: 'children',
      doc: 'children field',
      order: FieldOrder.ascending,
      nullable: true,
    })
      .addField(
        new PrimitiveField({
          name: 'id',
          type: 'int',
        }),
      )
      .addField(
        new RecordField({
          namespace: 'record.primitive.x.y',
          name: 'grandchildren',
          doc: 'children field',
          order: FieldOrder.descending,
          nullable: true,
          defaultValue: null,
        }).addField(
          new PrimitiveField({
            name: 'id',
            type: 'int',
          }),
        ),
      ),
  )
  .compile();

console.log(JSON.stringify(schema, null, 2));

This will output the following Avro Schema:

{
  "type": "record",
  "name": "myRecord",
  "namespace": "record.record",
  "fields": [
    {
      "name": "children",
      "type": [
        "null",
        {
          "fields": [
            {
              "name": "id",
              "type": "int"
            },
            {
              "name": "grandchildren",
              "type": [
                "null",
                {
                  "default": null,
                  "fields": [
                    {
                      "name": "id",
                      "type": "int"
                    }
                  ],
                  "name": "grandchildren",
                  "namespace": "record.primitive.x.y",
                  "type": "record"
                }
              ]
            }
          ],
          "name": "children",
          "namespace": "record.primitive.x",
          "type": "record"
        }
      ]
    }
  ]
}

Documentation

This package provides several classes and types for building Avro schemas:

• AvroSchemaBuilder: Main entry point for creating a schema. It is initialized with the name of the schema.
• FieldBuilder: Represents a field in the schema. It can be of various types including PrimitiveField, RecordField, ArrayField, EnumField, MapField, FixedField, UnionField, and ReferenceField.
• Other classes (PrimitiveField, RecordField, ArrayField, etc.): Represent the different types of fields available in Avro.
• types: Contains TypeScript type definitions for the various Avro types.

For a more detailed explanation of the classes and types available, and how to use them, please check out the source code and the test cases.

Contributing

Contributions are welcome! Please submit a pull request with any improvements or bug fixes. Make sure to add tests for any new features and bug fixes, and ensure that the existing tests pass.

License

This project is licensed under the MIT License.

Contact

If you need help or have questions, feel free to open an issue in the GitHub repository.