Added a new example using Falcon under the /examples/falcon_sqlalchemy directory.

Author: somada141

examples/falcon_sqlalchemy/README.md

@@ -0,0 +1,313 @@
+# demo-graphql-sqlalchemy-falcon
+
+## Overview
+
+This is a simple project demonstrating the implementation of a GraphQL server in Python using:
+
+- [SQLAlchemy](https://github.com/zzzeek/sqlalchemy).
+- [Falcon](https://github.com/falconry/falcon).
+- [Graphene](https://github.com/graphql-python/graphene).
+- [Graphene-SQLAlchemy](https://github.com/graphql-python/graphene-sqlalchemy).
+- [Gunicorn](https://github.com/benoitc/gunicorn).
+
+The objective is to demonstrate how these different libraries can be integrated.
+
+## Features
+
+The primary feature offered by this demo are:
+
+- [SQLAlchemy](https://github.com/zzzeek/sqlalchemy) ORM against a local SQLite database. The ORM is super simple but showcases a many-to-many relationship between `authors` and `books` via an `author_books` association table.
+- [Falcon](https://github.com/falconry/falcon) resources to serve both [GraphQL](https://github.com/facebook/graphql) and [GraphiQL](https://github.com/graphql/graphiql).
+
+> The [Falcon](https://github.com/falconry/falcon) resources are slightly modified versions of the ones under [https://github.com/alecrasmussen/falcon-graphql-server](https://github.com/alecrasmussen/falcon-graphql-server) so all credits to [Alec Rasmussen](https://github.com/alecrasmussen).
+
+- Basic [GraphQL](https://github.com/facebook/graphql) schema automatically derived from the [SQLAlchemy](https://github.com/zzzeek/sqlalchemy) ORM via [Graphene](https://github.com/graphql-python/graphene) and [Graphene-SQLAlchemy](https://github.com/graphql-python/graphene-sqlalchemy).
+- API setup via [Falcon](https://github.com/falconry/falcon) with the whole thing served via [Gunicorn](https://github.com/benoitc/gunicorn).
+
+## Usage
+
+All instructions and commands below are meant to be run from the root dir of this repo.
+
+### Prerequisites
+
+You are strongly encouraged to use a virtualenv here but I can be assed writing down the instructions for that.
+
+Install all requirements through:
+
+```
+pip install -r requirements.txt
+```
+
+### Sample Database
+
+The sample SQLite database has been committed in this repo but can easily be rebuilt through:
+
+```
+python -m demo.orm
+```
+
+at which point it will create a `demo.db` in the root of this repo.
+
+> The sample data are defined under `data.py` while they're ingested with the code under the `main` sentinel in `orm.py`. Feel free to tinker.
+
+### Running Server
+
+The [Gunicorn](https://github.com/benoitc/gunicorn) is configured via the `gunicorn_config.py` module and binds by default to `localhost:5432/`. You can change all gunicorn configuration options under the aforementioned module.
+
+The server can be run through:
+
+```
+gunicorn -c gunicorn_config.py "demo.demo:main()"
+```
+
+The server exposes two endpoints:
+
+- `/graphql`: The standard GraphQL endpoint which can receive the queries directly (accessible by default under [http://localhost:5432/graphql](http://localhost:5432/graphql)).
+- `/graphiql`: The [GraphiQL](https://github.com/graphql/graphiql) interface (accessible by default under [http://localhost:5432/graphiql](http://localhost:5432/graphiql)).
+
+### Queries
+
+Here's a couple example queries you can either run directly in [GraphiQL](https://github.com/graphql/graphiql) or by performing POST requests against the [GraphQL](https://github.com/facebook/graphql) server.
+
+#### Get an author by ID
+
+Query:
+
+```
+query getAuthor{
+  author(authorId: 1) {
+    nameFirst,
+    nameLast
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "author": {
+      "nameFirst": "Robert",
+      "nameLast": "Jordan"
+    }
+  }
+}
+```
+
+#### Get an author by first name
+
+```
+query getAuthor{
+  author(nameFirst: "Robert") {
+    nameFirst,
+    nameLast
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "author": {
+      "nameFirst": "Robert",
+      "nameLast": "Jordan"
+    }
+  }
+}
+```
+
+### Get an author and their books
+
+Query:
+
+```
+query getAuthor{
+  author(nameFirst: "Brandon") {
+    nameFirst,
+    nameLast,
+    books {
+      title,
+      year
+    }
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "author": {
+      "nameFirst": "Brandon",
+      "nameLast": "Sanderson",
+      "books": [
+        {
+          "title": "The Gathering Storm",
+          "year": 2009
+        },
+        {
+          "title": "Towers of Midnight",
+          "year": 2010
+        },
+        {
+          "title": "A Memory of Light",
+          "year": 2013
+        }
+      ]
+    }
+  }
+}
+```
+
+#### Get books by year
+
+Query:
+
+```
+query getBooks{
+  books(year: 1990) {
+    title,
+    year
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "books": [
+      {
+        "title": "The Eye of the World",
+        "year": 1990
+      },
+      {
+        "title": "The Great Hunt",
+        "year": 1990
+      }
+    ]
+  }
+}
+```
+
+#### Get books and their authors by their title
+
+Query:
+
+```
+query getBooks{
+  books(title: "A Memory of Light") {
+    title,
+    year,
+    authors {
+      nameFirst,
+      nameLast
+    }
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "books": [
+      {
+        "title": "A Memory of Light",
+        "year": 2013,
+        "authors": [
+          {
+            "nameFirst": "Robert",
+            "nameLast": "Jordan"
+          },
+          {
+            "nameFirst": "Brandon",
+            "nameLast": "Sanderson"
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+#### Get number of books by cover-artist
+
+Query:
+
+```
+query getCountBooksByCoverArtist{
+  stats {
+    countBooksByCoverArtist {
+      coverArtist,
+      countBooks
+    }
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "stats": {
+      "countBooksByCoverArtist": [
+        {
+          "coverArtist": null,
+          "countBooks": 1
+        },
+        {
+          "coverArtist": "Darrell K. Sweet",
+          "countBooks": 12
+        },
+        {
+          "coverArtist": "Michael Whelan",
+          "countBooks": 1
+        }
+      ]
+    }
+  }
+}
+```
+
+#### Add new author
+
+Query:
+
+```
+mutation createAuthor{
+  createAuthor(author: {
+    nameFirst: "First Name",
+    nameLast: "Last Name"
+  }) {
+    author {
+      authorId
+      nameFirst
+      nameLast
+    }
+  }
+}
+```
+
+Response:
+
+```
+{
+  "data": {
+    "createAuthor": {
+      "author": {
+        "authorId": "3",
+        "nameFirst": "First Name",
+        "nameLast": "Last Name"
+      }
+    }
+  }
+}
+```

examples/falcon_sqlalchemy/demo.db

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+# coding=utf-8
+
+from demo import api
+from demo import data
+from demo import demo
+from demo import orm
+from demo import orm_base
+from demo import resources
+from demo import schema
+from demo import schema_types
+from demo import utils

examples/falcon_sqlalchemy/demo/__init__.py

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+# coding=utf-8
+
+import sqlalchemy.orm
+import falcon
+import graphene
+
+from demo.resources import ResourceGraphQlSqlAlchemy
+from demo.resources import ResourceGraphiQL
+
+
+def create_app(
+    schema: graphene.Schema,
+    scoped_session: sqlalchemy.orm.scoped_session,
+    do_enable_graphiql: bool,
+):
+    # Create the API.
+    app = falcon.API()
+
+    app.add_route(
+        uri_template="/graphql",
+        resource=ResourceGraphQlSqlAlchemy(
+            schema=schema,
+            scoped_session=scoped_session,
+        )
+    )
+
+    if do_enable_graphiql:
+        app.add_route(
+            uri_template="/graphiql/",
+            resource=ResourceGraphiQL(
+                path_graphiql="graphiql",
+            )
+        )
+        app.add_route(
+            uri_template="/graphiql/{static_file}",
+            resource=ResourceGraphiQL(
+                path_graphiql="graphiql",
+            )
+        )
+
+    return app