OpenAPI translator

The OpenAPI translator, known by the type name "openapi" exposes OpenAPI data sources via relational concepts and uses the Teiid WS resource adapter for making web service calls.

What is OpenAPI?

[OpenAPI is a simple yet powerful representation of your RESTful API. With the largest ecosystem of API tooling on the planet, thousands of developers are supporting OpenAPI in almost every modern programming language and deployment environment. With an OpenAPI-enabled API, you get interactive documentation, client SDK generation, and discoverability.

This translator is compatible with OpenAPI/Swagger v2 and OpenAPI v3.

Usage

Usage of a OpenAPI source is similar any other translator in Teiid. The translator enables metadata import. The metadata is imported from source system’s metadata file and then exposed as stored procedures in Teiid. The source system can be queried by executing these stored procedures in Teiid system.

Note
 Although parameter order is guaranteed by the Swagger libraries, if you rely upon the native import, it is best if you call procedures using named, rather than positional parameters.

The below is sample VDB that can read metadata from Petstore reference service on http://petstore.swagger.io/ site.

<vdb name="petstore" version="1">
    <model visible="true" name="m">
        <property name="importer.metadataUrl" value="/swagger.json"/>
        <source name="s" translator-name="openapi" connection-jndi-name="java:/openapi"/>
    </model>
</vdb>

The required resource-adapter configuration will look like

<resource-adapter id="openapi">
    <module slot="main" id="org.jboss.teiid.resource-adapter.webservice"/>
    <transaction-support>NoTransaction</transaction-support>
    <connection-definitions>
        <connection-definition class-name="org.teiid.resource.adapter.ws.WSManagedConnectionFactory" jndi-name="java:/openapi" enabled="true" use-java-context="true" pool-name="teiid-openapi-ds">
            <config-property name="EndPoint">
                http://petstore.swagger.io/v2
            </config-property>
        </connection-definition>
    </connection-definitions>
</resource-adapter>

After you configure the preceding resource-adapter and deploy the VDB successfully, then you can connect to the VDB deployed using Teiid JDBC driver and issue SQL statements such as the following:

EXEC findPetsByStatus(('sold',))
EXEC getPetById(1461159803)
EXEC deletePet('', 1461159803)
Execution properties

Execution properties extend/limit the functionality of the translator based on the physical source capabilities. Sometimes default properties must be adjusted for proper execution of the translator.

Execution properties

None.

Importer properties

The following table lists the importer properties that define the behavior of the translator during the import of from the physical source.

Name Description Default

metadataUrl

URL from which to obtain the OpenAPI metadata. May be a local file using a file: URL.

true

server

The server to use. Otherwise the first server listed will be used.

null

preferredProduces

Preferred Accept MIME type header, this should be one of the OpenAPI 'produces' types;

application/json

preferredConsumes

Preferred Content-Type MIME type header, this should be one of the OpenAPI 'consumer' types;

application/json
JCA resource adapter

The resource adapter for this translator is a Web Service Data Source.

Tip
 Native queries - The OpenAPI translator cannot perform native or direct query execution. However, you can use the invokehttp method of the Web services translator to issue REST-based calls, and then use SQLXML to parse results.
Limitations

The OpenAPI translator does not fully implement all of the features of OpenAPI. The following limitations apply:

  • You cannot set the MIME type to application/xml in either the Accept or Content-Type headers.

  • File and Map properties cannot be used. As a result, any multi-part payloads are not supported.

  • The translator does not process security metadata.

  • The translator does not process custom properties that start with x-.

  • The translator does not work with following JSON schema keywords:

    • allOf

    • multipleOf

    • items

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