From a8e18654b3b08d316976b512689a5e2e7377a368 Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Mon, 16 Sep 2019 17:27:43 +0800
Subject: [PATCH 1/6] add appsync-graphql-dynamodb

---
 python/appsync-graphql-dynamodb/README.md     |  58 ++++++
 python/appsync-graphql-dynamodb/app.py        |  11 ++
 .../app_sync_cdk/__init__.py                  |   0
 .../app_sync_cdk/app_sync_cdk_stack.py        | 177 ++++++++++++++++++
 python/appsync-graphql-dynamodb/cdk.json      |   3 +
 .../appsync-graphql-dynamodb/requirements.txt |   4 +
 python/appsync-graphql-dynamodb/setup.py      |  45 +++++
 7 files changed, 298 insertions(+)
 create mode 100644 python/appsync-graphql-dynamodb/README.md
 create mode 100644 python/appsync-graphql-dynamodb/app.py
 create mode 100644 python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py
 create mode 100644 python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
 create mode 100644 python/appsync-graphql-dynamodb/cdk.json
 create mode 100644 python/appsync-graphql-dynamodb/requirements.txt
 create mode 100644 python/appsync-graphql-dynamodb/setup.py

diff --git a/python/appsync-graphql-dynamodb/README.md b/python/appsync-graphql-dynamodb/README.md
new file mode 100644
index 000000000..8940aea7a
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/README.md
@@ -0,0 +1,58 @@
+
+# Welcome to your CDK Python project!
+
+This is a blank project for Python development with CDK.
+
+The `cdk.json` file tells the CDK Toolkit how to execute your app.
+
+This project is set up like a standard Python project.  The initialization
+process also creates a virtualenv within this project, stored under the .env
+directory.  To create the virtualenv it assumes that there is a `python3`
+(or `python` for Windows) executable in your path with access to the `venv`
+package. If for any reason the automatic creation of the virtualenv fails,
+you can create the virtualenv manually.
+
+To manually create a virtualenv on MacOS and Linux:
+
+```
+$ python3 -m venv .env
+```
+
+After the init process completes and the virtualenv is created, you can use the following
+step to activate your virtualenv.
+
+```
+$ source .env/bin/activate
+```
+
+If you are a Windows platform, you would activate the virtualenv like this:
+
+```
+% .env\Scripts\activate.bat
+```
+
+Once the virtualenv is activated, you can install the required dependencies.
+
+```
+$ pip install -r requirements.txt
+```
+
+At this point you can now synthesize the CloudFormation template for this code.
+
+```
+$ cdk synth
+```
+
+To add additional dependencies, for example other CDK libraries, just add
+them to your `setup.py` file and rerun the `pip install -r requirements.txt`
+command.
+
+# Useful commands
+
+ * `cdk ls`          list all stacks in the app
+ * `cdk synth`       emits the synthesized CloudFormation template
+ * `cdk deploy`      deploy this stack to your default AWS account/region
+ * `cdk diff`        compare deployed stack with current state
+ * `cdk docs`        open CDK documentation
+
+Enjoy!
diff --git a/python/appsync-graphql-dynamodb/app.py b/python/appsync-graphql-dynamodb/app.py
new file mode 100644
index 000000000..6cd350643
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/app.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+
+from aws_cdk import core
+
+from app_sync_cdk.app_sync_cdk_stack import AppSyncCdkStack
+
+
+app = core.App()
+AppSyncCdkStack(app, "AppSyncGraphQLDynamoDBExample")
+
+app.synth()
diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py b/python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
new file mode 100644
index 000000000..d25c6f913
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
@@ -0,0 +1,177 @@
+from aws_cdk import core
+from aws_cdk.aws_appsync import (
+    CfnGraphQLSchema,
+    CfnGraphQLApi,
+    CfnApiKey,
+    CfnDataSource,
+    CfnResolver
+)
+from aws_cdk.aws_dynamodb import (
+    Table,
+    Attribute,
+    AttributeType,
+    StreamViewType,
+    BillingMode
+)
+from aws_cdk.aws_iam import (
+    Role,
+    ServicePrincipal,
+    ManagedPolicy
+)
+
+class AppSyncCdkStack(core.Stack):
+
+    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
+        super().__init__(scope, id, **kwargs)
+
+        table_name = 'items'
+
+        items_graphql_api = CfnGraphQLApi(
+            self, 'ItemsApi',
+            name='items-api',
+            authentication_type='API_KEY'
+        )
+
+        CfnApiKey(
+            self, 'ItemsApiKey', 
+            api_id=items_graphql_api.attr_api_id
+        )
+
+        api_schema = CfnGraphQLSchema(
+            self, 'ItemsSchema',
+            api_id=items_graphql_api.attr_api_id,
+            definition=f"""\
+                type {table_name} {{
+                    {table_name}Id: ID!
+                    name: String
+                }}
+                type Paginated{table_name} {{
+                    items: [{table_name}!]!
+                    nextToken: String
+                }}
+                type Query {{
+                    all(limit: Int, nextToken: String): Paginated{table_name}!
+                    getOne({table_name}Id: ID!): {table_name}
+                }}
+                type Mutation {{
+                    save(name: String!): {table_name}
+                    delete({table_name}Id: ID!): {table_name}
+                }}
+                type Schema {{
+                    query: Query
+                    mutation: Mutation
+                }}"""
+        )
+
+        items_table = Table(
+            self, 'ItemsTable',
+            table_name=table_name,
+            partition_key=Attribute(
+                name=f'{table_name}Id',
+                type=AttributeType.STRING
+            ),
+            billing_mode=BillingMode.PAY_PER_REQUEST,
+            stream=StreamViewType.NEW_IMAGE,
+
+            ## The default removal policy is RETAIN, which means that cdk destroy will not attempt to delete
+            ## the new table, and it will remain in your account until manually deleted. By setting the policy to 
+            ## DESTROY, cdk destroy will delete the table (even if it has data in it) 
+            removal_policy=core.RemovalPolicy.DESTROY ## NOT recommended for production code
+        )
+
+        items_table_role = Role(
+            self, 'ItemsDynamoDBRole',
+            assumed_by=ServicePrincipal('appsync.amazonaws.com')
+        )
+
+        items_table_role.add_managed_policy(ManagedPolicy.from_aws_managed_policy_name('arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess'))
+
+        data_source = CfnDataSource(
+            self, 'ItemsDataSource', 
+            api_id=items_graphql_api.attr_api_id,
+            name='ItemsDynamoDataSource',
+            type='AMAZON_DYNAMODB',
+            dynamo_db_config=CfnDataSource.DynamoDBConfigProperty(
+                table_name=items_table.table_name,
+                aws_region=self.region
+            ),
+            service_role_arn=items_table_role.role_arn
+        )
+
+        get_one_resolver = CfnResolver(
+            self, 'GetOneQueryResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Query',
+            field_name='getOne',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "GetItem",
+                "key": {{
+                "{table_name}Id": $util.dynamodb.toDynamoDBJson($ctx.args.{table_name}Id)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        get_one_resolver.add_depends_on(api_schema)
+
+        get_all_resolver = CfnResolver(
+            self, 'GetAllQueryResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Query',
+            field_name='all',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "Scan",
+                "limit": $util.defaultIfNull($ctx.args.limit, 20),
+                "nextToken": $util.toJson($util.defaultIfNullOrEmpty($ctx.args.nextToken, null))
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        get_all_resolver.add_depends_on(api_schema)
+
+        save_resolver = CfnResolver(
+            self, 'SaveMutationResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Mutation',
+            field_name='save',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "PutItem",
+                "key": {{
+                    "{table_name}Id": {{ "S": "$util.autoId()" }}
+                }},
+                "attributeValues": {{
+                    "name": $util.dynamodb.toDynamoDBJson($ctx.args.name)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        save_resolver.add_depends_on(api_schema)
+
+        delete_resolver = CfnResolver(
+            self, 'DeleteMutationResolver',
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Mutation',
+            field_name='delete',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "DeleteItem",
+                "key": {{
+                "{table_name}Id": $util.dynamodb.toDynamoDBJson($ctx.args.{table_name}Id)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        delete_resolver.add_depends_on(api_schema)
\ No newline at end of file
diff --git a/python/appsync-graphql-dynamodb/cdk.json b/python/appsync-graphql-dynamodb/cdk.json
new file mode 100644
index 000000000..787a71dd6
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/cdk.json
@@ -0,0 +1,3 @@
+{
+    "app": "python3 app.py"
+}
diff --git a/python/appsync-graphql-dynamodb/requirements.txt b/python/appsync-graphql-dynamodb/requirements.txt
new file mode 100644
index 000000000..8af60b896
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/requirements.txt
@@ -0,0 +1,4 @@
+aws_cdk.core
+aws_cdk.aws_appsync
+aws_cdk.aws_dynamodb
+aws_cdk.aws_iam
\ No newline at end of file
diff --git a/python/appsync-graphql-dynamodb/setup.py b/python/appsync-graphql-dynamodb/setup.py
new file mode 100644
index 000000000..d695b4aa6
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/setup.py
@@ -0,0 +1,45 @@
+import setuptools
+
+
+with open("README.md") as fp:
+    long_description = fp.read()
+
+
+setuptools.setup(
+    name="app_sync_cdk",
+    version="0.0.1",
+
+    description="An empty CDK Python app",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+
+    author="author",
+
+    package_dir={"": "app_sync_cdk"},
+    packages=setuptools.find_packages(where="app_sync_cdk"),
+
+    install_requires=[
+        "aws-cdk.core",
+    ],
+
+    python_requires=">=3.6",
+
+    classifiers=[
+        "Development Status :: 4 - Beta",
+
+        "Intended Audience :: Developers",
+
+        "License :: OSI Approved :: Apache Software License",
+
+        "Programming Language :: JavaScript",
+        "Programming Language :: Python :: 3 :: Only",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+
+        "Topic :: Software Development :: Code Generators",
+        "Topic :: Utilities",
+
+        "Typing :: Typed",
+    ],
+)

From b2b577be01c482a20b224a61e0ee7777353df932 Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Mon, 16 Sep 2019 17:27:43 +0800
Subject: [PATCH 2/6] add appsync-graphql-dynamodb

---
 python/appsync-graphql-dynamodb/app.py        |  11 ++
 .../app_sync_cdk/__init__.py                  |   0
 .../app_sync_cdk/app_sync_cdk_stack.py        | 177 ++++++++++++++++++
 python/appsync-graphql-dynamodb/cdk.json      |   3 +
 .../appsync-graphql-dynamodb/requirements.txt |   4 +
 python/appsync-graphql-dynamodb/setup.py      |  45 +++++
 6 files changed, 240 insertions(+)
 create mode 100644 python/appsync-graphql-dynamodb/app.py
 create mode 100644 python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py
 create mode 100644 python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
 create mode 100644 python/appsync-graphql-dynamodb/cdk.json
 create mode 100644 python/appsync-graphql-dynamodb/requirements.txt
 create mode 100644 python/appsync-graphql-dynamodb/setup.py

diff --git a/python/appsync-graphql-dynamodb/app.py b/python/appsync-graphql-dynamodb/app.py
new file mode 100644
index 000000000..6cd350643
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/app.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python3
+
+from aws_cdk import core
+
+from app_sync_cdk.app_sync_cdk_stack import AppSyncCdkStack
+
+
+app = core.App()
+AppSyncCdkStack(app, "AppSyncGraphQLDynamoDBExample")
+
+app.synth()
diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py b/python/appsync-graphql-dynamodb/app_sync_cdk/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
new file mode 100644
index 000000000..d25c6f913
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
@@ -0,0 +1,177 @@
+from aws_cdk import core
+from aws_cdk.aws_appsync import (
+    CfnGraphQLSchema,
+    CfnGraphQLApi,
+    CfnApiKey,
+    CfnDataSource,
+    CfnResolver
+)
+from aws_cdk.aws_dynamodb import (
+    Table,
+    Attribute,
+    AttributeType,
+    StreamViewType,
+    BillingMode
+)
+from aws_cdk.aws_iam import (
+    Role,
+    ServicePrincipal,
+    ManagedPolicy
+)
+
+class AppSyncCdkStack(core.Stack):
+
+    def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
+        super().__init__(scope, id, **kwargs)
+
+        table_name = 'items'
+
+        items_graphql_api = CfnGraphQLApi(
+            self, 'ItemsApi',
+            name='items-api',
+            authentication_type='API_KEY'
+        )
+
+        CfnApiKey(
+            self, 'ItemsApiKey', 
+            api_id=items_graphql_api.attr_api_id
+        )
+
+        api_schema = CfnGraphQLSchema(
+            self, 'ItemsSchema',
+            api_id=items_graphql_api.attr_api_id,
+            definition=f"""\
+                type {table_name} {{
+                    {table_name}Id: ID!
+                    name: String
+                }}
+                type Paginated{table_name} {{
+                    items: [{table_name}!]!
+                    nextToken: String
+                }}
+                type Query {{
+                    all(limit: Int, nextToken: String): Paginated{table_name}!
+                    getOne({table_name}Id: ID!): {table_name}
+                }}
+                type Mutation {{
+                    save(name: String!): {table_name}
+                    delete({table_name}Id: ID!): {table_name}
+                }}
+                type Schema {{
+                    query: Query
+                    mutation: Mutation
+                }}"""
+        )
+
+        items_table = Table(
+            self, 'ItemsTable',
+            table_name=table_name,
+            partition_key=Attribute(
+                name=f'{table_name}Id',
+                type=AttributeType.STRING
+            ),
+            billing_mode=BillingMode.PAY_PER_REQUEST,
+            stream=StreamViewType.NEW_IMAGE,
+
+            ## The default removal policy is RETAIN, which means that cdk destroy will not attempt to delete
+            ## the new table, and it will remain in your account until manually deleted. By setting the policy to 
+            ## DESTROY, cdk destroy will delete the table (even if it has data in it) 
+            removal_policy=core.RemovalPolicy.DESTROY ## NOT recommended for production code
+        )
+
+        items_table_role = Role(
+            self, 'ItemsDynamoDBRole',
+            assumed_by=ServicePrincipal('appsync.amazonaws.com')
+        )
+
+        items_table_role.add_managed_policy(ManagedPolicy.from_aws_managed_policy_name('arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess'))
+
+        data_source = CfnDataSource(
+            self, 'ItemsDataSource', 
+            api_id=items_graphql_api.attr_api_id,
+            name='ItemsDynamoDataSource',
+            type='AMAZON_DYNAMODB',
+            dynamo_db_config=CfnDataSource.DynamoDBConfigProperty(
+                table_name=items_table.table_name,
+                aws_region=self.region
+            ),
+            service_role_arn=items_table_role.role_arn
+        )
+
+        get_one_resolver = CfnResolver(
+            self, 'GetOneQueryResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Query',
+            field_name='getOne',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "GetItem",
+                "key": {{
+                "{table_name}Id": $util.dynamodb.toDynamoDBJson($ctx.args.{table_name}Id)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        get_one_resolver.add_depends_on(api_schema)
+
+        get_all_resolver = CfnResolver(
+            self, 'GetAllQueryResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Query',
+            field_name='all',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "Scan",
+                "limit": $util.defaultIfNull($ctx.args.limit, 20),
+                "nextToken": $util.toJson($util.defaultIfNullOrEmpty($ctx.args.nextToken, null))
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        get_all_resolver.add_depends_on(api_schema)
+
+        save_resolver = CfnResolver(
+            self, 'SaveMutationResolver', 
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Mutation',
+            field_name='save',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "PutItem",
+                "key": {{
+                    "{table_name}Id": {{ "S": "$util.autoId()" }}
+                }},
+                "attributeValues": {{
+                    "name": $util.dynamodb.toDynamoDBJson($ctx.args.name)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        save_resolver.add_depends_on(api_schema)
+
+        delete_resolver = CfnResolver(
+            self, 'DeleteMutationResolver',
+            api_id=items_graphql_api.attr_api_id,
+            type_name='Mutation',
+            field_name='delete',
+            data_source_name=data_source.name,
+            request_mapping_template=f"""\
+            {{
+                "version": "2017-02-28",
+                "operation": "DeleteItem",
+                "key": {{
+                "{table_name}Id": $util.dynamodb.toDynamoDBJson($ctx.args.{table_name}Id)
+                }}
+            }}""",
+            response_mapping_template="$util.toJson($ctx.result)"
+        )
+
+        delete_resolver.add_depends_on(api_schema)
\ No newline at end of file
diff --git a/python/appsync-graphql-dynamodb/cdk.json b/python/appsync-graphql-dynamodb/cdk.json
new file mode 100644
index 000000000..787a71dd6
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/cdk.json
@@ -0,0 +1,3 @@
+{
+    "app": "python3 app.py"
+}
diff --git a/python/appsync-graphql-dynamodb/requirements.txt b/python/appsync-graphql-dynamodb/requirements.txt
new file mode 100644
index 000000000..8af60b896
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/requirements.txt
@@ -0,0 +1,4 @@
+aws_cdk.core
+aws_cdk.aws_appsync
+aws_cdk.aws_dynamodb
+aws_cdk.aws_iam
\ No newline at end of file
diff --git a/python/appsync-graphql-dynamodb/setup.py b/python/appsync-graphql-dynamodb/setup.py
new file mode 100644
index 000000000..d695b4aa6
--- /dev/null
+++ b/python/appsync-graphql-dynamodb/setup.py
@@ -0,0 +1,45 @@
+import setuptools
+
+
+with open("README.md") as fp:
+    long_description = fp.read()
+
+
+setuptools.setup(
+    name="app_sync_cdk",
+    version="0.0.1",
+
+    description="An empty CDK Python app",
+    long_description=long_description,
+    long_description_content_type="text/markdown",
+
+    author="author",
+
+    package_dir={"": "app_sync_cdk"},
+    packages=setuptools.find_packages(where="app_sync_cdk"),
+
+    install_requires=[
+        "aws-cdk.core",
+    ],
+
+    python_requires=">=3.6",
+
+    classifiers=[
+        "Development Status :: 4 - Beta",
+
+        "Intended Audience :: Developers",
+
+        "License :: OSI Approved :: Apache Software License",
+
+        "Programming Language :: JavaScript",
+        "Programming Language :: Python :: 3 :: Only",
+        "Programming Language :: Python :: 3.6",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+
+        "Topic :: Software Development :: Code Generators",
+        "Topic :: Utilities",
+
+        "Typing :: Typed",
+    ],
+)

From 1d3387905da77e939dc7a28e08d8e5c65f223fa0 Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Mon, 16 Sep 2019 17:29:59 +0800
Subject: [PATCH 3/6] Delete README.md

---
 python/appsync-graphql-dynamodb/README.md | 58 -----------------------
 1 file changed, 58 deletions(-)
 delete mode 100644 python/appsync-graphql-dynamodb/README.md

diff --git a/python/appsync-graphql-dynamodb/README.md b/python/appsync-graphql-dynamodb/README.md
deleted file mode 100644
index 8940aea7a..000000000
--- a/python/appsync-graphql-dynamodb/README.md
+++ /dev/null
@@ -1,58 +0,0 @@
-
-# Welcome to your CDK Python project!
-
-This is a blank project for Python development with CDK.
-
-The `cdk.json` file tells the CDK Toolkit how to execute your app.
-
-This project is set up like a standard Python project.  The initialization
-process also creates a virtualenv within this project, stored under the .env
-directory.  To create the virtualenv it assumes that there is a `python3`
-(or `python` for Windows) executable in your path with access to the `venv`
-package. If for any reason the automatic creation of the virtualenv fails,
-you can create the virtualenv manually.
-
-To manually create a virtualenv on MacOS and Linux:
-
-```
-$ python3 -m venv .env
-```
-
-After the init process completes and the virtualenv is created, you can use the following
-step to activate your virtualenv.
-
-```
-$ source .env/bin/activate
-```
-
-If you are a Windows platform, you would activate the virtualenv like this:
-
-```
-% .env\Scripts\activate.bat
-```
-
-Once the virtualenv is activated, you can install the required dependencies.
-
-```
-$ pip install -r requirements.txt
-```
-
-At this point you can now synthesize the CloudFormation template for this code.
-
-```
-$ cdk synth
-```
-
-To add additional dependencies, for example other CDK libraries, just add
-them to your `setup.py` file and rerun the `pip install -r requirements.txt`
-command.
-
-# Useful commands
-
- * `cdk ls`          list all stacks in the app
- * `cdk synth`       emits the synthesized CloudFormation template
- * `cdk deploy`      deploy this stack to your default AWS account/region
- * `cdk diff`        compare deployed stack with current state
- * `cdk docs`        open CDK documentation
-
-Enjoy!

From 220a104ba71247480a71a4587dd4ea631d7dedd9 Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Mon, 16 Sep 2019 17:38:48 +0800
Subject: [PATCH 4/6] feat: add appsync-graphql-dynamodb python example

---
 .../app_sync_cdk/app_sync_cdk_stack.py                        | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
index d25c6f913..307387a42 100644
--- a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
+++ b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
@@ -174,4 +174,6 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
             response_mapping_template="$util.toJson($ctx.result)"
         )
 
-        delete_resolver.add_depends_on(api_schema)
\ No newline at end of file
+        delete_resolver.add_depends_on(api_schema)
+
+

From 3ddfa03468a578a2b21887d41753d4941d159545 Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Wed, 18 Sep 2019 04:50:26 +0800
Subject: [PATCH 5/6] pep8 lint

---
 .../app_sync_cdk/app_sync_cdk_stack.py        | 31 +++++++++++--------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
index 307387a42..6fb3d1360 100644
--- a/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
+++ b/python/appsync-graphql-dynamodb/app_sync_cdk/app_sync_cdk_stack.py
@@ -19,6 +19,7 @@
     ManagedPolicy
 )
 
+
 class AppSyncCdkStack(core.Stack):
 
     def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
@@ -33,7 +34,7 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
         )
 
         CfnApiKey(
-            self, 'ItemsApiKey', 
+            self, 'ItemsApiKey',
             api_id=items_graphql_api.attr_api_id
         )
 
@@ -73,10 +74,12 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
             billing_mode=BillingMode.PAY_PER_REQUEST,
             stream=StreamViewType.NEW_IMAGE,
 
-            ## The default removal policy is RETAIN, which means that cdk destroy will not attempt to delete
-            ## the new table, and it will remain in your account until manually deleted. By setting the policy to 
-            ## DESTROY, cdk destroy will delete the table (even if it has data in it) 
-            removal_policy=core.RemovalPolicy.DESTROY ## NOT recommended for production code
+            # The default removal policy is RETAIN, which means that cdk
+            # destroy will not attempt to delete the new table, and it will
+            # remain in your account until manually deleted. By setting the
+            # policy to DESTROY, cdk destroy will delete the table (even if it
+            # has data in it)
+            removal_policy=core.RemovalPolicy.DESTROY # NOT recommended for production code
         )
 
         items_table_role = Role(
@@ -84,10 +87,14 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
             assumed_by=ServicePrincipal('appsync.amazonaws.com')
         )
 
-        items_table_role.add_managed_policy(ManagedPolicy.from_aws_managed_policy_name('arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess'))
+        items_table_role.add_managed_policy(
+            ManagedPolicy.from_aws_managed_policy_name(
+                'arn:aws:iam::aws:policy/AmazonDynamoDBFullAccess'
+            )
+        )
 
         data_source = CfnDataSource(
-            self, 'ItemsDataSource', 
+            self, 'ItemsDataSource',
             api_id=items_graphql_api.attr_api_id,
             name='ItemsDynamoDataSource',
             type='AMAZON_DYNAMODB',
@@ -99,7 +106,7 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
         )
 
         get_one_resolver = CfnResolver(
-            self, 'GetOneQueryResolver', 
+            self, 'GetOneQueryResolver',
             api_id=items_graphql_api.attr_api_id,
             type_name='Query',
             field_name='getOne',
@@ -118,7 +125,7 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
         get_one_resolver.add_depends_on(api_schema)
 
         get_all_resolver = CfnResolver(
-            self, 'GetAllQueryResolver', 
+            self, 'GetAllQueryResolver',
             api_id=items_graphql_api.attr_api_id,
             type_name='Query',
             field_name='all',
@@ -136,7 +143,7 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
         get_all_resolver.add_depends_on(api_schema)
 
         save_resolver = CfnResolver(
-            self, 'SaveMutationResolver', 
+            self, 'SaveMutationResolver',
             api_id=items_graphql_api.attr_api_id,
             type_name='Mutation',
             field_name='save',
@@ -174,6 +181,4 @@ def __init__(self, scope: core.Construct, id: str, **kwargs) -> None:
             response_mapping_template="$util.toJson($ctx.result)"
         )
 
-        delete_resolver.add_depends_on(api_schema)
-
-
+        delete_resolver.add_depends_on(api_schema)
\ No newline at end of file

From d87a2d697f69e60e5c0b0a5a6ebc744b197288ef Mon Sep 17 00:00:00 2001
From: zanhsieh <zanhsieh@gmail.com>
Date: Wed, 18 Sep 2019 04:53:46 +0800
Subject: [PATCH 6/6] rm setup.py

---
 python/appsync-graphql-dynamodb/setup.py | 45 ------------------------
 1 file changed, 45 deletions(-)
 delete mode 100644 python/appsync-graphql-dynamodb/setup.py

diff --git a/python/appsync-graphql-dynamodb/setup.py b/python/appsync-graphql-dynamodb/setup.py
deleted file mode 100644
index d695b4aa6..000000000
--- a/python/appsync-graphql-dynamodb/setup.py
+++ /dev/null
@@ -1,45 +0,0 @@
-import setuptools
-
-
-with open("README.md") as fp:
-    long_description = fp.read()
-
-
-setuptools.setup(
-    name="app_sync_cdk",
-    version="0.0.1",
-
-    description="An empty CDK Python app",
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-
-    author="author",
-
-    package_dir={"": "app_sync_cdk"},
-    packages=setuptools.find_packages(where="app_sync_cdk"),
-
-    install_requires=[
-        "aws-cdk.core",
-    ],
-
-    python_requires=">=3.6",
-
-    classifiers=[
-        "Development Status :: 4 - Beta",
-
-        "Intended Audience :: Developers",
-
-        "License :: OSI Approved :: Apache Software License",
-
-        "Programming Language :: JavaScript",
-        "Programming Language :: Python :: 3 :: Only",
-        "Programming Language :: Python :: 3.6",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-
-        "Topic :: Software Development :: Code Generators",
-        "Topic :: Utilities",
-
-        "Typing :: Typed",
-    ],
-)