Amazon GameLift Search for a Game Session and Join It

arazzo: 1.0.1
info:
  title: Amazon GameLift Search for a Game Session and Join It
  summary: Search a fleet for an active game session with open slots, then reserve a player session on it.
  description: >-
    A matchmaking-free join flow for players who want to drop into an existing
    open game. The workflow searches a fleet for active game sessions that have
    available player slots, and when a match is found, reserves a player session
    for the player on the discovered session. When no open session is found the
    flow ends without reserving a session. Each step spells out its AWS JSON
    protocol request inline, including the X-Amz-Target header, so the flow can
    be read and executed without opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: gameLiftApi
  url: ../openapi/amazon-gamelift-openapi.yaml
  type: openapi
workflows:
- workflowId: search-and-join
  summary: Search a fleet for an open game session and reserve a player session on it.
  description: >-
    Searches a fleet for active game sessions with available player slots and,
    when one is found, reserves a player session on it; otherwise ends without
    joining.
  inputs:
    type: object
    required:
    - fleetId
    - playerId
    properties:
      fleetId:
        type: string
        description: The fleet ID or ARN to search for active game sessions.
      filterExpression:
        type: string
        description: Optional search filter, e.g. "hasAvailablePlayerSessions=true".
      sortExpression:
        type: string
        description: Optional sort expression, e.g. "creationTimeMillis ASC".
      playerId:
        type: string
        description: Developer-defined unique identifier for the player to add.
      playerData:
        type: string
        description: Optional developer-defined data for the player.
  steps:
  - stepId: searchSessions
    description: >-
      Search the fleet for active game sessions matching the filter, returning
      up to the first matching session.
    operationId: SearchGameSessions
    parameters:
    - name: X-Amz-Target
      in: header
      value: GameLift.SearchGameSessions
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        FleetId: $inputs.fleetId
        FilterExpression: $inputs.filterExpression
        SortExpression: $inputs.sortExpression
        Limit: 1
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      foundGameSessionId: $response.body#/GameSessions/0/GameSessionId
    onSuccess:
    - name: sessionFound
      type: goto
      stepId: joinSession
      criteria:
      - context: $response.body
        condition: $.GameSessions.length > 0
        type: jsonpath
    - name: noSession
      type: end
      criteria:
      - context: $response.body
        condition: $.GameSessions.length == 0
        type: jsonpath
  - stepId: joinSession
    description: >-
      Reserve a player session on the discovered game session so the player can
      connect.
    operationId: CreatePlayerSession
    parameters:
    - name: X-Amz-Target
      in: header
      value: GameLift.CreatePlayerSession
    requestBody:
      contentType: application/x-amz-json-1.1
      payload:
        GameSessionId: $steps.searchSessions.outputs.foundGameSessionId
        PlayerId: $inputs.playerId
        PlayerData: $inputs.playerData
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      playerSessionId: $response.body#/PlayerSession/PlayerSessionId
      playerSessionStatus: $response.body#/PlayerSession/Status
  outputs:
    gameSessionId: $steps.searchSessions.outputs.foundGameSessionId
    playerSessionId: $steps.joinSession.outputs.playerSessionId