graphql source: introspect the server (or load remote/local introspection)

[dotansimha]

Ideally, we want a graphql source to be able to load introspection for the source.

These are the options we need:

Load from source (default)

(default)

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/

or

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/
      introspection:
        from: source

or, with custom headers:

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/
      introspection:
        from: source
        headers:
           X-Admin-Key: 123

or, with polling:

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/
      introspection:
        from: source
        polling_interval: 60

Load from a remote JSON file (local or remote)

remote:

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/
      introspection:
        from: json
        location: https://countries.trevorblades.com/introspection.json

local:

sources:
  - id: countries
    type: graphql
    config:
      endpoint: https://countries.trevorblades.com/
      introspection:
        from: json
        location: /file-system/introspection.json

Tasks

Beta Give feedback

1. Load introspection from the source
2. Support for custom introspection headers
3. Support for polling
4. Load introspection from remote JSON file
5. Load introspection from local JSON file

[YassinEldeeb]

skipped for now