[Test Proxy] Add fixture to automatically start/stop Docker container

tools/azure-sdk-tools/devtools_testutils/__init__.py

@@ -15,6 +15,7 @@
 )
 from .keyvault_preparer import KeyVaultPreparer
 from .powershell_preparer import PowerShellPreparer
+from .proxy_docker_startup import start_test_proxy, stop_test_proxy, test_proxy
 from .proxy_testcase import recorded_by_proxy
 from .sanitizers import (
     add_body_key_sanitizer,
@@ -57,6 +58,9 @@
     "CachedResourceGroupPreparer",
     "PowerShellPreparer",
     "recorded_by_proxy",
+    "test_proxy",
+    "start_test_proxy",
+    "stop_test_proxy",
     "ResponseCallback",
     "RetryCounter",
     "FakeTokenCredential",

tools/azure-sdk-tools/devtools_testutils/proxy_docker_startup.py

@@ -0,0 +1,155 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import json
+import os
+import logging
+import requests
+import shlex
+import sys
+import time
+from typing import TYPE_CHECKING
+
+import pytest
+import subprocess
+
+from .config import PROXY_URL
+
+if TYPE_CHECKING:
+    from typing import Optional
+
+
+_LOGGER = logging.getLogger()
+
+CONTAINER_NAME = "ambitious_azsdk_test_proxy"
+LINUX_IMAGE_SOURCE_PREFIX = "azsdkengsys.azurecr.io/engsys/testproxy-lin"
+WINDOWS_IMAGE_SOURCE_PREFIX = "azsdkengsys.azurecr.io/engsys/testproxy-win"
+CONTAINER_STARTUP_TIMEOUT = 6000
+
+REPO_ROOT = os.path.abspath(os.path.join(os.path.abspath(__file__), "..", "..", "..", ".."))
+
+
+def get_image_tag():
+    # type: () -> str
+    """Gets the test proxy Docker image tag from the docker-start-proxy.ps1 script in /eng/common"""
+    pwsh_script_location = os.path.abspath(
+        os.path.join(REPO_ROOT, os.path.relpath("eng/common/testproxy/docker-start-proxy.ps1"))
+    )
+
+    image_tag = None
+    with open(pwsh_script_location, "r") as f:
+        for line in f:
+            if line.startswith("$SELECTED_IMAGE_TAG"):
+                image_tag_with_quotes = line.split()[-1]
+                image_tag = image_tag_with_quotes.strip('"')
+
+    return image_tag
+
+
+def get_container_info():
+    # type: () -> Optional[dict]
+    """Returns a dictionary containing the test proxy container's information, or None if the container isn't present"""
+    proc = subprocess.Popen(
+        shlex.split("docker container ls -a --format '{{json .}}' --filter name=" + CONTAINER_NAME),
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+    )
+
+    output, stderr = proc.communicate()
+    try:
+        # This will succeed if we found a container with CONTAINER_NAME
+        return json.loads(output)
+    # We'll get a JSONDecodeError on Py3 (ValueError on Py2) if output is empty (i.e. there's no proxy container)
+    except ValueError:
+        # Didn't find a container with CONTAINER_NAME
+        return None
+
+
+def create_container():
+    # type: () -> None
+    """Creates the test proxy Docker container"""
+    # Most of the time, running this script on a Windows machine will work just fine, as Docker defaults to Linux
+    # containers. However, in CI, Windows images default to _Windows_ containers. We cannot swap them. We can tell
+    # if we're in a CI build by checking for the environment variable TF_BUILD.
+    if sys.platform.startswith("win") and os.environ.get("TF_BUILD"):
+        image_prefix = WINDOWS_IMAGE_SOURCE_PREFIX
+        path_prefix = "C:"
+        linux_container_args = ""
+    else:
+        image_prefix = LINUX_IMAGE_SOURCE_PREFIX
+        path_prefix = ""
+        linux_container_args = "--add-host=host.docker.internal:host-gateway"
+
+    image_tag = get_image_tag()
+    proc = subprocess.Popen(
+        shlex.split(
+            "docker container create -v '{}:{}/etc/testproxy' {} -p 5001:5001 -p 5000:5000 --name {} {}:{}".format(
+                REPO_ROOT, path_prefix, linux_container_args, CONTAINER_NAME, image_prefix, image_tag
+            )
+        )
+    )
+    proc.communicate()
+
+
+def start_test_proxy():
+    # type: () -> None
+    """Starts the test proxy and returns when the proxy server is ready to receive requests"""
+    _LOGGER.info("Starting the test proxy container...")
+
+    container_info = get_container_info()
+    if container_info:
+        _LOGGER.debug("Found an existing instance of the test proxy container.")
+
+        if container_info["State"] == "running":
+            _LOGGER.debug("Proxy container is already running. Exiting...")
+            return
+
+    else:
+        _LOGGER.debug("No instance of the test proxy container found. Attempting creation...")
+        create_container()
+
+    _LOGGER.debug("Attempting to start the test proxy container...")
+
+    proc = subprocess.Popen(shlex.split("docker container start " + CONTAINER_NAME))
+    proc.communicate()
+
+    # Wait for the proxy server to become available
+    start = time.time()
+    now = time.time()
+    status_code = 0
+    while now - start < CONTAINER_STARTUP_TIMEOUT and status_code != 200:
+        try:
+            response = requests.get(PROXY_URL.rstrip("/") + "/Info/Available", timeout=60)
+            status_code = response.status_code
+        # We get an SSLError if the container is started but the endpoint isn't available yet
+        except requests.exceptions.SSLError:
+            pass
+        now = time.time()
+
+
+def stop_test_proxy():
+    # type: () -> None
+    """Stops any running instance of the test proxy"""
+    _LOGGER.info("Stopping the test proxy container...")
+
+    container_info = get_container_info()
+    if container_info:
+        if container_info["State"] == "running":
+            _LOGGER.debug("Found a running instance of the test proxy container; shutting it down...")
+
+            proc = subprocess.Popen(shlex.split("docker container stop " + CONTAINER_NAME))
+            proc.communicate()
+    else:
+        _LOGGER.debug("No running instance of the test proxy container found. Exiting...")
+
+
+@pytest.fixture(scope="session")
+def test_proxy():
+    """Pytest fixture to be used before running any tests that are recorded with the test proxy"""
+    start_test_proxy()
+    # Everything before this yield will be run before fixtures that invoke this one are run
+    # Everything after it will be run after invoking fixtures are done executing
+    yield
+    stop_test_proxy()