optimizer

AsyncAPI offers many ways to reuse certain parts of the document like messages or schemas definitions or references to external files, not to even mention the traits. Purpose of AsyncAPI Optimizer is to enable different ways to optimize AsyncAPI files. It is a library that can be used in UIs and CLIs.

This package now lives in the asyncapi/cli monorepo under packages/optimizer/ and is released from there (same npm name @asyncapi/optimizer).

v2 is a breaking release for direct library consumers. Errors are now typed classes carrying a stable .code (OptimizerError / OptimizerErrorCode) instead of plain Error + console.error; getReport() now returns { type, elements }[]; and @asyncapi/parser is now a peerDependency (install it alongside). The optimization algorithm and getOptimizedDocument() behaviour are unchanged. See the migration guide: docs/optimizer/optimizer-migration.md.

• Testing
• Usage
  • Node.js
  • Generating report
  • Applying the suggested changes
• API documentation

Testing

1. Clone the CLI monorepo git clone https://github.com/asyncapi/cli.git
2. Install the dependencies from the repo root npm i
3. Build this package with npm run optimizer:build, or from packages/optimizer run npm run example. You can open examples/index.js and modify it or add your own AsyncAPI document.

Usage

Node.js

import { Optimizer } from '@asyncapi/optimizer'
import type { Report } from '@asyncapi/optimizer'

const yaml = `
asyncapi: 3.0.0
info:
  title: Example Service
  version: 1.0.0
  description: Example Service.
servers:
  production:
    host: 'test.mosquitto.org:{port}'
    protocol: mqtt
    description: Test broker
    variables:
      port:
        description: Secure connection (TLS) is available through port 8883.
        default: '1883'
        enum:
          - '1883'
          - '8883'
operations:
  user/deleteAccount.subscribe:
    action: send
    channel:
      $ref: '#/channels/commentLikedChannel'
channels:
  commentLikedChannel:
    address: comment/liked
    messages:
      commentLikedMessage:
        description: Message that is being sent when a comment has been liked by someone.
        payload:
          type: object
          title: commentLikedPayload
          properties:
            commentId:
              type: string
              description: an id object
              x-origin: ./schemas.yaml#/schemas/idSchema
          x-origin: ./schemas.yaml#/schemas/commentLikedSchema
        x-origin: ./messages.yaml#/messages/commentLikedMessage
    x-origin: ./channels.yaml#/channels/commentLikedChannel`

const optimizer = new Optimizer(yaml)

Generating report

const report = await optimizer.getReport()
/*
v2: getReport() returns { type, elements }[] (not a keyed object).

[
  { type: 'removeComponents', elements: [] },
  { type: 'reuseComponents', elements: [] },
  {
    type: 'moveAllToComponents',
    elements: [
      {
        path: 'channels.commentLikedChannel.messages.commentLikedMessage.payload.properties.commentId',
        action: 'move',
        target: 'components.schemas.idSchema'
      },
      {
        path: 'channels.commentLikedChannel.messages.commentLikedMessage.payload',
        action: 'move',
        target: 'components.schemas.commentLikedSchema'
      },
      {
        path: 'channels.commentLikedChannel.messages.commentLikedMessage',
        action: 'move',
        target: 'components.messages.commentLikedMessage'
      },
      {
        path: 'operations.user/deleteAccount.subscribe',
        action: 'move',
        target: 'components.operations.subscribe'
      },
      {
        path: 'channels.commentLikedChannel',
        action: 'move',
        target: 'components.channels.commentLikedChannel'
      },
      {
        path: 'servers.production',
        action: 'move',
        target: 'components.servers.production'
      }
    ]
  },
  { type: 'moveDuplicatesToComponents', elements: [] }
]
 */

Applying the suggested changes

const optimizedDocument = optimizer.getOptimizedDocument({
  output: 'YAML',
  rules: {
    reuseComponents: true,
    removeComponents: true,
    moveAllToComponents: true,
    moveDuplicatesToComponents: false,
  },
  disableOptimizationFor: {
    schema: false,
  },
})
/*
the optimizedDocument value will be:

asyncapi: 3.0.0
info:
  title: Example Service
  version: 1.0.0
  description: Example Service.
servers:
  production:
    $ref: '#/components/servers/production'
operations:
  user/deleteAccount.subscribe:
    action: send
    channel:
      $ref: '#/channels/commentLikedChannel'
  user/deleteAccount:
    subscribe:
      $ref: '#/components/operations/subscribe'
channels:
  commentLikedChannel:
    $ref: '#/components/channels/commentLikedChannel'
components:
  schemas:
    idSchema:
      type: string
      description: an id object
      x-origin: ./schemas.yaml#/schemas/idSchema
    commentLikedSchema:
      type: object
      title: commentLikedPayload
      properties:
        commentId:
          $ref: '#/components/schemas/idSchema'
      x-origin: ./schemas.yaml#/schemas/commentLikedSchema
  messages:
    commentLikedMessage:
      description: Message that is being sent when a comment has been liked by someone.
      payload:
        $ref: '#/components/schemas/commentLikedSchema'
      x-origin: ./messages.yaml#/messages/commentLikedMessage
  operations: {}
  channels:
    commentLikedChannel:
      address: comment/liked
      messages:
        commentLikedMessage:
          $ref: '#/components/messages/commentLikedMessage'
      x-origin: ./channels.yaml#/channels/commentLikedChannel
  servers:
    production:
      host: test.mosquitto.org:{port}
      protocol: mqtt
      description: Test broker
      variables:
        port:
          description: Secure connection (TLS) is available through port 8883.
          default: '1883'
          enum:
            - '1883'
            - '8883'
 */

API documentation

For using the optimizer to optimize file you just need to import the Optimizer class. Use its two methods to get the report (getReport()) and get the optimized document (getOptimizedDocument()).

See API documentation for more example and full API reference information.