graphql-db-api

A Python DB API 2.0 for GraphQL APIs

This module allows you to query GraphQL APIs using SQL.

SQLAlchemy support

This module provides a SQLAlchemy dialect.

from sqlalchemy.engine import create_engine

# Over HTTPS (default):
engine_https = create_engine('graphql://host:port/path')

# Over HTTP:
engine_http = create_engine('graphql://host:port/path?is_https=0')

# With a `Bearer` token in the `Authorization` header:
engine_http = create_engine('graphql://:token@host:port/path')

Example Usage

Querying Connections

from sqlalchemy import create_engine
from sqlalchemy import text

# We use GraphQL SWAPI (The Star Wars API) c/o Netlify:
engine = create_engine('graphql://swapi-graphql.netlify.app/.netlify/functions/index')

# Demonstration of requesting nested resource of homeworld
# and then selecting fields from it
query = "select name, homeworld__name from 'allPeople?include=homeworld'"

with engine.connect() as connection:
    for row in connection.execute(text(query)):
        print(row)

Querying Lists

We can mark a given GQL query as being a List when we query that "Table" using a query parameter:

from sqlalchemy import create_engine
from sqlalchemy import text

engine = create_engine('graphql://pet-library.moonhighway.com/')

# The default assumes top level is a Connection.
# For Lists, we must disable this:
query = "select id, name from 'allPets?is_connection=0'"

with engine.connect() as connection:
    for row in connection.execute(text(query)):
        print(row)

alternatively, we can set that at the Engine level:

from sqlalchemy import create_engine
from sqlalchemy import text

# We mark 'allPets' as being a List at the Engine level:
engine = create_engine(
    'graphql://pet-library.moonhighway.com/',
    list_queries=["allPets"],
)

query = "select id, name from allPets"

with engine.connect() as connection:
    for row in connection.execute(text(query)):
        print(row)

Superset support

In order to use with Superset, install this package and then use the graphql protocol in the SQLAlchemy URI like: graphql://swapi-graphql.netlify.app/.netlify/functions/index. We install a db_engine_spec so Superset should recognize the driver.

Roadmap

• Non-Connections top level
• Path traversal (basic)
• Path traversal (basic + nested)
• Path traversal (list / connection)
• Bearer Tokens in Authorization Header
• Advanced Auth (e.g. with token refresh)
• Passing Headers (e.g. Auth in other locations)
• Filtering
• Sorting
• Relay Pagination