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OpenAPI

Incubating

Important Capabilities​

CapabilityStatusNotes
Platform Instance❌

CLI based Ingestion​

Install the Plugin​

The openapi source works out of the box with acryl-datahub.

Starter Recipe​

Check out the following recipe to get started with ingestion! See below for full configuration options.

For general pointers on writing and running a recipe, see our main recipe guide.

source:
  type: openapi
  config:
    name: test_endpoint # this name will appear in DatHub
    url: https://test_endpoint.com/
    swagger_file: classicapi/doc/swagger.json  # where to search for the OpenApi definitions
    get_token:  # optional, if you need to get an authentication token beforehand
        request_type: get
        url: api/authentication/login?username={username}&password={password}
    username: your_username  # optional
    password: your_password  # optional
    forced_examples:  # optionals
      /accounts/groupname/{name}: ['test']
      /accounts/username/{name}: ['test']
    ignore_endpoints: [/ignore/this, /ignore/that, /also/that_other]  # optional, the endpoints to ignore

sink:
  type: "datahub-rest"
  config:
    server: 'http://localhost:8080'

Config Details​

Note that a . is used to denote nested fields in the YAML recipe.

FieldDescription
name ✅
string
Name of ingestion.
swagger_file ✅
string
Route for access to the swagger file. e.g. openapi.json
url ✅
string
Endpoint URL. e.g. https://example.com
forced_examples
object
If no example is provided for a route, it is possible to create one using forced_example.
Default: {}
get_token
object
Retrieving a token from the endpoint.
Default: {}
ignore_endpoints
array
password
string
Password used for basic HTTP authentication.
Default:
proxies
object
Eg. {'http': 'http://10.10.1.10:3128', 'https': 'http://10.10.1.10:1080'}.If authentication is required, add it to the proxy url directly e.g. http://user:pass@10.10.1.10:3128/.
token
string
Token for endpoint authentication.
username
string
Username used for basic HTTP authentication.
Default:

The dataset metadata should be defined directly in the Swagger file, section ["example"]. If this is not true, the following procedures will take place.

Capabilities​

This plugin reads the swagger file where the endpoints are defined, reads example data if provided (for any method), or searches for data for the endpoints which do not have example data and accept a GET call.

For every selected endpoint defined in the paths section, the tool searches whether the metadata are already defined. As example, if in your swagger file there is the /api/users/ defined as follows:

paths:
  /api/users/:
    get:
      tags: [ "Users" ]
      operationID: GetUsers
      description: Retrieve users data
      responses:
        '200':
          description: Return the list of users
          content:
            application/json:
              example:
                {"user": "username", "name": "Full Name", "job": "any", "is_active": True}

then this plugin has all the information needed to create the dataset in DataHub.

In case there is no example defined, the plugin will try to get the metadata directly from the endpoint, if it is a GET method. So, if in your swagger file you have

paths:
  /colors/:
    get:
      tags: [ "Colors" ]
      operationID: GetDefinedColors
      description: Retrieve colors
      responses:
        '200':
          description: Return the list of colors

the tool will make a GET call to https://test_endpoint.com/colors and parse the response obtained.

Automatically recorded examples​

Sometimes you can have an endpoint which wants a parameter to work, like https://test_endpoint.com/colors/{color}.

Since in the OpenApi specifications the listing endpoints are specified just before the detailed ones, in the list of the paths, you will find

https://test_endpoint.com/colors

defined before

https://test_endpoint.com/colors/{color}

This plugin is set to automatically keep an example of the data given by the first URL, which with some probability will include an example of attribute needed by the second.

So, if by calling GET to the first URL you get as response:

{"pantone code": 100,
 "color": "yellow",
 ...}

the "color": "yellow" part will be used to complete the second link, which will become:

https://test_endpoint.com/colors/yellow

and this last URL will be called to get back the needed metadata.

Automatic guessing of IDs​

If no useful example is found, a second procedure will try to guess a numerical ID. So if we have:

https://test_endpoint.com/colors/{colorID}

and there is no colorID example already found by the plugin, it will try to put a number one (1) at the parameter place

https://test_endpoint.com/colors/1

and this URL will be called to get back the needed metadata.

Config details​

Token authentication​

If this tool needs to get an access token to interrogate the endpoints, this can be requested. Two methods are available at the moment:

  • 'get' : this requires username/password combination to be present in the url. Note that {username} and {password} are mandatory placeholders. They will be replaced with the true credentials at runtime. Note that username and password will be sent in the request address, so it's unsecure. If your provider allows for the other method, please go for it.
  • 'post' : username and password will be inserted in the body of the POST request

In both cases, username and password are the ones defined in the configuration file.

Getting dataset metadata from forced_example​

Suppose you have an endpoint defined in the swagger file, but without example given, and the tool is unable to guess the URL. In such cases you can still manually specify it in the forced_examples part of the configuration file.

As example, if in your swagger file you have

paths:
  /accounts/groupname/{name}/:
    get:
      tags: [ "Groups" ]
      operationID: GetGroup
      description: Retrieve group data
      responses:
        '200':
          description: Return details about the group

and the plugin did not find an example in its previous calls, the tool has no idea about what to substitute for the {name} part.

By specifying in the configuration file

    forced_examples:  # optionals
      /accounts/groupname/{name}: ['test']

the plugin is able to build a correct URL, as follows:

https://test_endpoint.com/accounts/groupname/test

Code Coordinates​

  • Class Name: datahub.ingestion.source.openapi.OpenApiSource
  • Browse on GitHub

Questions

If you've got any questions on configuring ingestion for OpenAPI, feel free to ping us on our Slack.