openapi: 3.0.2
info:
  version: '1.0.0' 
  
  title: Mycelium management
  contact:
    url: 'https://github.com/threefoldtech/mycelium'
  license:
    name: Apache 2.0
    url: 'https://github.com/threefoldtech/mycelium/LICENSE'
  
  description: |
    This is the specification of the **mycelium** management API. It is used to perform admin tasks on the system, and
    to perform administrative duties.

externalDocs:
  description: For full documentation, check out the mycelium github repo.
  url: 'https://github.com/threefoldtech/mycelium'

tags:
  - name: Message
    description: Operations on the embedded message subsystem

servers:
  - url: 'http://localhost:8989'

paths:
  '/api/v1/messages':
    get:
      tags:
        - Message
      summary: Pop a message from the inbound message queue
      description: |
        Pop a message from the inbound message queue. The message is removed from the queue and won't be shown again
      operationId: popMessage
      responses:
        '200':
          description: Message retrieved
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InboundMessage'
        '204':
          description: No message ready
    post:
      tags:
        - Message
      summary: Submit a new message to the system.
      description: |
        Push a new message to the systems outbound message queue. The system will continuously attempt to send the message until
        it is either fully transmitted, or the send deadline is expired.
      operationId: pushMessage
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PushMessageBody'
      responses:
        '200':
          description: Message pushed successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PushMessageResponse'

  '/api/v1/messages/peek':
    get:
      tags:
        - Message
      summary: Peek a message from the inbound queue
      description: |
        Peek a message from the inbound message queue. The message is removed from the queue and will be shown
        again on the next call again to peek or pop
      operationId: peekMessage
      responses:
        '200':
          description: Message peeked successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/InboundMessage'
        '204':
          description: No message ready

  '/api/v1/messages/status/:id':
    get:
      tags:
        - Message
      summary: Get the status of an outbound message
      description: |
        Get information about the current state of an outbound message. This can be used to check the transmission
        state, size and destination of the message.
      operationId: getMessageInfo
      responses:
        '200':
          description: Success
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MessageStatusResponse'
        '404':
          description: Message not found


components:
  schemas:
    InboundMessage:
      description: A message received by the system
      type: object
      properties:
        id:
          description: Id of the message, hex encoded
          type: string
          minLength: 16
          maxLength: 16
          example: 0123456789abcdef
        src:
          description: Sender public key, hex encoded
          type: string
          minLength: 64
          maxLength: 64
          example: fedbca9876543210fedbca9876543210fedbca9876543210fedbca9876543210
        dst:
          description: Receiver public key, hex encoded. This is the public key of the system
          type: string
          minLength: 64
          maxLength: 64
          example: 02468ace13579bdf02468ace13579bdf02468ace13579bdf02468ace13579bdf
        payload:
          description: The message payload, encoded in standard alphabet base64
          type: string
          format: byte
          example: xuV+

    PushMessageBody:
      description: A message to send to a given receiver
      type: object
      properties:
        dst:
          description: An IP in the subnet of the receiver node
          type: string
          format: ipv6
          example: 249:abcd:0123:defa::1
        payload:
          description: The message to send, base64 encoded
          type: string
          format: byte
          example: xuV+

    PushMessageResponse:
      description: The ID generated for a message after pushing it to the system
      type: object
      properties:
        id:
          description: Id of the message, hex encoded
          type: string
          minLength: 16
          maxLength: 16
          example: 0123456789abcdef

    MessageStatusResponse:
      description: Information about an outobund message
      type: object
      properties:
        dst:
          description: Ip address of the receiving node
          type: string
          format: ipv6
          example: 249:abcd:0123:defa::1
        state: 
          $ref: '#/components/schemas/TransmissionState'
        created:
          description: Unix timestamp of when this message was created
          type: integer
          format: int64
          example: 1649512789
        deadline:
          description: Unix timestamp of when this message will expire. If the message is not received before this, the system will give up
          type: integer
          format: int64
          example: 1649513089
        msg_len:
          description: Length of the message in bytes
          type: integer
          minimum: 0
          example: 27

    TransmissionState:
      description: The state of an outbound message in it's lifetime
      oneOf:
        - type: string
          enum: ['Pending', 'Received', 'Read', 'Aborted']
          example: 'Received'
        - type: object
          properties:
            sending:
              type: object
              properties:
                pending:
                  type: integer
                  minimum: 0
                  example: 5
                sent:
                  type: integer
                  minimum: 0
                  example: 17
                acked:
                  type: integer
                  minimum: 0
                  example: 3
      example: 'Received'