30-Orchestration.yaml

# yaml-language-server: $schema=https://www.membrane-api.io/v7.1.2.json
#
# Tutorial: Orchestration
#
# Shows how to create an API that combines two backend calls into one API.
# 1) Fetch a book by id.
# 2) Use the author key from the book payload to fetch the author.
#
# Try:
#    curl localhost:2000/books/OL29474405M
#    curl localhost:2000/books/OL26333978M

api:
  port: 2000
  path:
    uri: /books/{id}
  flow:
    - request:
        - call:
            url: https://openlibrary.org/books/${pathParam.id}.json
        - setProperty:
            name: title
            value: ${$.title}
            language: jsonpath
        - call:
            url: https://openlibrary.org${$.authors[0].key}.json
            language: jsonpath
        - template:
            contentType: application/json
            src: |
              {
                "title": ${property.title},
                "author": ${jsonPath('$.name')}
              }
    - return:
        status: 200