Add initial samples for Python V2 programming model

samples-v2/fan_in_fan_out/.funcignore

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+.git*
+.vscode
+local.settings.json
+test
+.venv

samples-v2/fan_in_fan_out/.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don’t work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# celery beat schedule file
+celerybeat-schedule
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# Azure Functions artifacts
+bin
+obj
+appsettings.json
+local.settings.json
+.python_packages

samples-v2/fan_in_fan_out/README.md

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+# Fan-Out Fan-In
+
+This directory contains an executable version of [this](https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-cloud-backup?tabs=python) tutorial. Please review the link above for instructions on how to run it.

samples-v2/fan_in_fan_out/extensions.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+	<WarningsAsErrors></WarningsAsErrors>
+	<DefaultItemExcludes>**</DefaultItemExcludes>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.DurableTask" Version="2.9.1" />
+    <PackageReference Include="Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator" Version="1.1.3" />
+  </ItemGroup>
+</Project>

samples-v2/fan_in_fan_out/function_app.py

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+from typing import List
+
+import os
+from os.path import dirname
+
+import json
+import pathlib
+import logging
+
+from azure.storage.blob import BlobServiceClient
+from azure.core.exceptions import ResourceExistsError
+
+import azure.functions as func
+import azure.durable_functions as df
+
+myApp = df.DFApp(http_auth_level=func.AuthLevel.ANONYMOUS)
+
+@myApp.route(route="orchestrators/{functionName}")
+@myApp.durable_client_input(client_name="client")
+async def HttpStart(req: func.HttpRequest, client):
+    payload: str = json.loads(req.get_body().decode()) # Load JSON post request data
+    instance_id = await client.start_new(req.route_params["functionName"], client_input=payload)
+
+    logging.info(f"Started orchestration with ID = '{instance_id}'.")
+
+    return client.create_check_status_response(req, instance_id)
+
+@myApp.orchestration_trigger(context_name="context")
+def E2_BackupSiteContent(context: df.DurableOrchestrationContext):
+    root_directory: str = context.get_input()
+
+    if not root_directory:
+        raise Exception("A directory path is required as input")
+
+    files = yield context.call_activity("E2_GetFileList", root_directory)
+    tasks = []
+    for file in files:
+        tasks.append(context.call_activity("E2_CopyFileToBlob", file))
+
+    results = yield context.task_all(tasks)
+    total_bytes = sum(results)
+    return total_bytes
+
+connect_str = os.getenv('AzureWebJobsStorage')
+
+@myApp.activity_trigger(input_name="rootDirectory")
+def E2_GetFileList(rootDirectory):
+    all_file_paths = []
+    # We walk the file system
+    for path, _, files in os.walk(rootDirectory):
+        # We copy the code for activities and orchestrators
+        if "E2_" in path:
+            # For each file, we add their full-path to the list
+            for name in files:
+                if name == "__init__.py" or name == "function.json":
+                    file_path = os.path.join(path, name)
+                    all_file_paths.append(file_path)
+
+    return all_file_paths
+
+@myApp.activity_trigger(input_name="filePath")
+def E2_CopyFileToBlob(filePath):
+    # Create the BlobServiceClient object which will be used to create a container client
+    blob_service_client = BlobServiceClient.from_connection_string(connect_str)
+
+    # Create a unique name for the container
+    container_name = "backups"
+
+    # Create the container if it does not exist
+    try:
+        blob_service_client.create_container(container_name)
+    except ResourceExistsError:
+        pass
+
+    # Create a blob client using the local file name as the name for the blob
+    parent_dir, fname = pathlib.Path(filePath).parts[-2:] # Get last two path components
+    blob_name = parent_dir + "_" + fname
+    blob_client = blob_service_client.get_blob_client(container=container_name, blob=blob_name)
+
+    # Count bytes in file
+    byte_count = os.path.getsize(filePath)
+
+    # Upload the created file
+    with open(filePath, "rb") as data:
+        blob_client.upload_blob(data)
+
+    return byte_count

samples-v2/fan_in_fan_out/host.json

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+{
+  "version": "2.0",
+  "logging": {
+    "applicationInsights": {
+      "samplingSettings": {
+        "isEnabled": true,
+        "excludedTypes": "Request"
+      }
+    }
+  }
+}

samples-v2/fan_in_fan_out/proxies.json

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+{
+  "$schema": "http://json.schemastore.org/proxies",
+  "proxies": {}
+}

samples-v2/fan_in_fan_out/requirements.txt

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+# DO NOT include azure-functions-worker in this file
+# The Python Worker is managed by Azure Functions platform
+# Manually managing azure-functions-worker may cause unexpected issues
+
+azure-functions
+azure-functions-durable
+azure-storage-blob

samples-v2/function_chaining/.funcignore

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+.git*
+.vscode
+local.settings.json
+test
+.venv