neon/compute_tools/src/http/openapi_spec.yaml

openapi: "3.0.2"
info:
  title: Compute node control API
  version: "1.0"

servers:
  - url: "http://localhost:3080"

paths:
  /status:
    get:
      tags:
      - Info
      summary: Get compute node internal status.
      description: ""
      operationId: getComputeStatus
      responses:
        200:
          description: ComputeState
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ComputeState"

  /metrics.json:
    get:
      tags:
      - Info
      summary: Get compute node startup metrics in JSON format.
      description: ""
      operationId: getComputeMetricsJSON
      responses:
        200:
          description: ComputeMetrics
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ComputeMetrics"

  /insights:
    get:
      tags:
      - Info
      summary: Get current compute insights in JSON format.
      description: |
        Note, that this doesn't include any historical data.
      operationId: getComputeInsights
      responses:
        200:
          description: Compute insights
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ComputeInsights"

  /info:
    get:
      tags:
      - Info
      summary: Get info about the compute pod / VM.
      description: ""
      operationId: getInfo
      responses:
        200:
          description: Info
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Info"

  /check_writability:
    post:
      tags:
      - Check
      summary: Check that we can write new data on this compute.
      description: ""
      operationId: checkComputeWritability
      responses:
        200:
          description: Check result
          content:
            text/plain:
              schema:
                type: string
                description: Error text or 'true' if check passed.
                example: "true"

  /configure:
    post:
      tags:
      - Configure
      summary: Request compute node configuration.
      description: |
        This is a blocking API endpoint, i.e. it blocks waiting until
        compute is finished configuration and is in `Running` state.
        Optional non-blocking mode could be added later. Currently,
        it's also assumed that reconfiguration doesn't require restart.
      operationId: configureCompute
      requestBody:
        description: Configuration request.
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - spec
              properties:
                spec:
                  # XXX: I don't want to explain current spec in the OpenAPI format,
                  # as it could be changed really soon. Consider doing it later.
                  type: object
      responses:
        200:
          description: Compute configuration finished.
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/ComputeState"
        400:
          description: Provided spec is invalid.
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/GenericError"
        412:
          description: |
            It's not possible to do live-configuration of the compute.
            It's either in the wrong state, or compute doesn't use pull
            mode of configuration.
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/GenericError"

components:
  securitySchemes:
    JWT:
      type: http
      scheme: bearer
      bearerFormat: JWT

  schemas:
    ComputeMetrics:
      type: object
      description: Compute startup metrics.
      required:
        - sync_safekeepers_ms
        - basebackup_ms
        - config_ms
        - total_startup_ms
      properties:
        sync_safekeepers_ms:
          type: integer
        basebackup_ms:
          type: integer
        config_ms:
          type: integer
        total_startup_ms:
          type: integer

    Info:
      type: object
      description: Information about VM/Pod.
      required:
        - num_cpus
      properties:
        num_cpus:
          type: integer

    ComputeState:
      type: object
      required:
        - status
        - last_active
      properties:
        status:
          $ref: '#/components/schemas/ComputeStatus'
        last_active:
          type: string
          description: The last detected compute activity timestamp in UTC and RFC3339 format.
          example: "2022-10-12T07:20:50.52Z"
        error:
          type: string
          description: Text of the error during compute startup, if any.
          example: ""
        tenant:
          type: string
          description: Identifier of the current tenant served by compute node, if any.
          example: c9269c359e9a199fad1ea0981246a78f
        timeline:
          type: string
          description: Identifier of the current timeline served by compute node, if any.
          example: ece7de74d4b8cbe5433a68ce4d1b97b4

    ComputeInsights:
      type: object
      properties:
        pg_stat_statements:
          description: Contains raw output from pg_stat_statements in JSON format.
          type: array
          items:
            type: object

    ComputeStatus:
      type: string
      enum:
        - init
        - failed
        - running
      example: running

    #
    # Errors
    #

    GenericError:
      type: object
      required:
        - error
      properties:
        error:
          type: string

security:
  - JWT: []