Dependencies

One of the most powerful features of Cortex is the ability to define outgoing dependencies on other services and resources. This powers many features, including automated notifications to owners when a dependency deprecates its API or makes backwards incompatible changes. Incoming dependencies are inferred based the outgoing dependency definitions.

Catalog Descriptor

The x-cortex-dependency field allows you to define a list of outgoing dependencies. A dependency should be directed towards an outgoing service or resource, or more granularly, to a specific endpoint of that entity.

info:
  x-cortex-dependency:
    - tag: braavos
      method: GET
      path: /2.0/users/{username}
      description: ensure user has payment information configured
      metadata:
        tags:
          - billing
          - identity
        prod: true

Cortex automatically discovers dependencies between your services and AWS resources with a matching tag (see Discovery for details), but you can also specify a list of AWS tag key and value pairs to explicitly define dependencies. If you'd like to explicitly define these AWS dependencies, the x-cortex-dependency field should be a map, not a list. A service will have dependencies on all resources in Cortex for which the corresponding AWS resource has at least one tag key value pair matching the pairs in the specified list. For example, the service below will have dependencies on any AWS resource with tag (key = my-key-1, value = my-value-1) or tag (key = my-key-2, value = my-value-2).

x-cortex-dependency:
  cortex:
    - tag: braavos
      method: GET
      path: /2.0/users/{username}
      description: ensure user has payment information configured
      metadata:
        tags:
          - billing
          - identity
        prod: true
    - tag: charlie
      method: GET
      path: /2.0/users/
   aws:
      tags:
        - key: my-key-1
          value: my-value-1
        - key: my-key-2
          value: my-value-2

Field	Description	Optional?
tag	The `tag` of the entity this entity depends on, i.e. the callee. See `x-cortex-tag`	No
method	HTTP method if depending on a specific endpoint	Required if path is present
path	The actual endpoint this dependency reffers to	Required if `method` is present
description	A description of the dependency.	Yes
metadata	JSON metadata tags for the relationship. Supports arbitrary objects.	Yes

Discovery

Cortex can automatically discover dependencies from your integrations. Dependency discovery occurs on a fixed schedule, but admins can manually trigger dependency discovery by clicking the sync button on the Dependency Graph page, next to 'Sources'. Supported providers:

API

See API Docs for authentication details.

If a dependency has already been set through the cortex.yml, the API will return an error.

A dependency optionally references an endpoint (method and path) of the callee. If no endpoint is referenced it is assumed that the caller depends on all endpoints of the callee.

For all requests method or path are optional, however if one is present the other must also be present.

When interacting with an existing dependency, the method and path must be specified correctly to identify it.

Field	Description	Optional?
callerTag	The `tag` of the caller.	No
calleeTag	The `tag` the caller depends on.	No
method	HTTP method if depending on a specific endpoint	Required if `path` is present
path	The actual endpoint (as defined in the OpenAPI file) the caller depends on	Required if `method` is present
description	A description of the dependency.	Yes
metadata	JSON metadata tags for the relationship. Supports arbitrary objects.	Yes

{
  "callerTag": "my-service",
  "calleeTag": "braavos",
  "path": "/2.0/users/{username}",
  "method": "GET",
  "description": "ensure user has payment information configured",
  "metadata": {
    "tags": ["billing", "identity"],
    "prod": true
  }
}

Create a Dependency

POST /api/v1/catalog/{caller-tag}/dependencies/{callee-tag}?method={method}&path={path}

{
  "description": "ensure user has payment information configured",
  "metadata": {
    "tags": ["billing", "identity"],
    "prod": true
  }
}

Retrieve a Dependency

GET /api/v1/catalog/{caller-tag}/dependencies/{callee-tag}?method={method}&path={path}

Update a Dependency

PUT /api/v1/catalog/{caller-tag}/dependencies/{callee-tag}?method={method}&path={path}

The request body is considered a modified version of the already existing entity. Leaving a field out of the JSON will be interpreted as null.

{
  "description": "ensure user has payment information configured",
  "metadata": {
    "tags": ["billing", "identity"],
    "prod": false
  }
}

Delete a Dependency

DELETE /api/v1/catalog/{caller-tag}/dependencies/{callee-tag}?method={method}&path={path}

Bulk Create or Update Dependencies

PUT /api/v1/catalog/dependencies

The request body is considered a modified version of the already existing entity. Leaving a field out of the JSON will be interpreted as null.

{
  "values": {
    "my-service": [
      {
        "tag": "braavos",
        "path": "/2.0/users/{username}",
        "method": "GET",
        "description": "ensure user has payment information configured",
        "metadata": {
          "tags": ["billing", "identity"],
          "prod": true
        }
      }
    ],
    "my-other-service": [
      {
        "tag": "my-service",
        "path": "/1.0/widget/{id}",
        "method": "GET",
        "description": "get widget",
        "metadata": {
          "tags": ["widget"],
          "prod": true
        }
      }
    ]
  }
}