graphql flask (#192)

.gitignore

@@ -39,3 +39,4 @@ llmonitor/__pycache__/
 newrelic/.env
 otel/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/__pycache__/
 otel/opentelemetry-instrumentation-langchain/opentelemetry/instrumentation/langchain/otel_lib/__pycache__/
+__pycache__

my_flask_graphql_app/README.md

@@ -0,0 +1,11 @@
+# Prepare
+
+```
+flask db init
+flask db migrate -m "Initial migration."
+flask db upgrade
+```
+
+# Access
+
+Access http://127.0.0.1:5000/graphql

my_flask_graphql_app/app.py

@@ -0,0 +1,31 @@
+from flask import Flask, jsonify
+from models import db, User
+from flask_migrate import Migrate
+from views.graphql_view import graphql_bp
+from config import Config
+
+app = Flask(__name__)
+app.config.from_object(Config)
+db.init_app(app)
+migrate = Migrate(app, db)
+
+# 注册蓝图
+app.register_blueprint(graphql_bp, url_prefix='/graphql')
+
+@app.route('/')
+def index():
+    return jsonify({"message": "Welcome to the Flask GraphQL API!"})
+
+def insert_initial_data():
+    with app.app_context():
+        if User.query.count() == 0:  # 只在表中没有数据时插入
+            user1 = User(username='user1', email='[email protected]')
+            user2 = User(username='user2', email='[email protected]')
+            db.session.add(user1)
+            db.session.add(user2)
+            db.session.commit()
+            print("Initial data inserted")
+
+if __name__ == '__main__':
+    insert_initial_data()  # 插入初始数据
+    app.run(debug=True)

my_flask_graphql_app/config.py

@@ -0,0 +1,7 @@
+import os
+
+basedir = os.path.abspath(os.path.dirname(__file__))
+
+class Config:
+    SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'example.db')
+    SQLALCHEMY_TRACK_MODIFICATIONS = False

my_flask_graphql_app/migrations/README

@@ -0,0 +1 @@
+Single-database configuration for Flask.

my_flask_graphql_app/migrations/alembic.ini

@@ -0,0 +1,50 @@
+# A generic, single database configuration.
+
+[alembic]
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic,flask_migrate
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[logger_flask_migrate]
+level = INFO
+handlers =
+qualname = flask_migrate
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

my_flask_graphql_app/migrations/env.py

@@ -0,0 +1,113 @@
+import logging
+from logging.config import fileConfig
+
+from flask import current_app
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+logger = logging.getLogger('alembic.env')
+
+
+def get_engine():
+    try:
+        # this works with Flask-SQLAlchemy<3 and Alchemical
+        return current_app.extensions['migrate'].db.get_engine()
+    except (TypeError, AttributeError):
+        # this works with Flask-SQLAlchemy>=3
+        return current_app.extensions['migrate'].db.engine
+
+
+def get_engine_url():
+    try:
+        return get_engine().url.render_as_string(hide_password=False).replace(
+            '%', '%%')
+    except AttributeError:
+        return str(get_engine().url).replace('%', '%%')
+
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+config.set_main_option('sqlalchemy.url', get_engine_url())
+target_db = current_app.extensions['migrate'].db
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def get_metadata():
+    if hasattr(target_db, 'metadatas'):
+        return target_db.metadatas[None]
+    return target_db.metadata
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url, target_metadata=get_metadata(), literal_binds=True
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    # this callback is used to prevent an auto-migration from being generated
+    # when there are no changes to the schema
+    # reference: http://alembic.zzzcomputing.com/en/latest/cookbook.html
+    def process_revision_directives(context, revision, directives):
+        if getattr(config.cmd_opts, 'autogenerate', False):
+            script = directives[0]
+            if script.upgrade_ops.is_empty():
+                directives[:] = []
+                logger.info('No changes in schema detected.')
+
+    conf_args = current_app.extensions['migrate'].configure_args
+    if conf_args.get("process_revision_directives") is None:
+        conf_args["process_revision_directives"] = process_revision_directives
+
+    connectable = get_engine()
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=get_metadata(),
+            **conf_args
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

my_flask_graphql_app/migrations/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

my_flask_graphql_app/migrations/versions/8336c2cb4e3c_initial_migration.py

@@ -0,0 +1,35 @@
+"""Initial migration.
+
+Revision ID: 8336c2cb4e3c
+Revises: 
+Create Date: 2024-08-06 14:53:39.096278
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '8336c2cb4e3c'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('user',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('username', sa.String(length=80), nullable=False),
+    sa.Column('email', sa.String(length=120), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('email'),
+    sa.UniqueConstraint('username')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('user')
+    # ### end Alembic commands ###

my_flask_graphql_app/models/__init__.py

@@ -0,0 +1,6 @@
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+# 导入模型
+from .user import User

my_flask_graphql_app/models/user.py

@@ -0,0 +1,9 @@
+from . import db
+
+class User(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(80), unique=True, nullable=False)
+    email = db.Column(db.String(120), unique=True, nullable=False)
+
+    def __repr__(self):
+        return f'<User {self.username}>'

my_flask_graphql_app/requirements.txt

@@ -0,0 +1,7 @@
+flask
+sqlalchemy
+flask_sqlalchemy
+flask_migrate
+graphene
+graphene_sqlalchemy
+flask-graphql

my_flask_graphql_app/schema/__init__.py

@@ -0,0 +1,14 @@
+import graphene
+from graphene_sqlalchemy import SQLAlchemyObjectType, SQLAlchemyConnectionField
+from models import User
+
+class UserObject(SQLAlchemyObjectType):
+    class Meta:
+        model = User
+        interfaces = (graphene.relay.Node, )
+
+class Query(graphene.ObjectType):
+    node = graphene.relay.Node.Field()
+    all_users = SQLAlchemyConnectionField(UserObject)
+
+schema = graphene.Schema(query=Query)

my_flask_graphql_app/views/graphql_view.py

@@ -0,0 +1,14 @@
+from flask import Blueprint
+from flask_graphql import GraphQLView
+from schema import schema
+
+graphql_bp = Blueprint('graphql', __name__)
+
+graphql_bp.add_url_rule(
+    '',
+    view_func=GraphQLView.as_view(
+        'graphql',
+        schema=schema,
+        graphiql=True  # 为了在浏览器中测试
+    )
+)