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VM Metadata API: Adds an option to disable VM metadata API call #4568

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merged 9 commits into from
Jul 8, 2024
Merged

VM Metadata API: Adds an option to disable VM metadata API call #4568

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db04319
add env variable
sourabh1007 Jul 3, 2024
96ff6ac
fixed tests
sourabh1007 Jul 3, 2024
4e6055b
removed try-catch
sourabh1007 Jul 3, 2024
1d04618
add doc
sourabh1007 Jul 3, 2024
10d3911
remove else
sourabh1007 Jul 3, 2024
95f2b40
put try-catch around test
sourabh1007 Jul 3, 2024
b9041f6
remove debugger
sourabh1007 Jul 4, 2024
2a22d04
update env variable name and updated known issue section
sourabh1007 Jul 8, 2024
c2b81fb
updstade doc
sourabh1007 Jul 8, 2024
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33 changes: 25 additions & 8 deletions Microsoft.Azure.Cosmos/src/Telemetry/VmMetadataApiHandler.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,28 +34,45 @@ internal static class VmMetadataApiHandler

private static bool isInitialized = false;
private static AzureVMMetadata azMetadata = null;


/// <summary>
/// Check for environment variable COSMOS_DISABLE_VM_METADATA_ACCESS to decide if VM metadata call should be made or not.
/// If environment variable is set to true, then VM metadata call will not be made.
/// If environment variable is set to false, then VM metadata call will be made.
/// If environment variable is not set, then set the value according to the debugger which means
/// In Debug mode, it is will be true and VM metadata call will be disabled.
/// In Release mode, it is will be false and VM metadata call will be enabled.
/// </summary>.
/// <param name="httpClient"></param>
internal static void TryInitialize(CosmosHttpClient httpClient)
{
if (VmMetadataApiHandler.isInitialized)
bool isVMMetadataAccessDisabled =
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ConfigurationManager.GetEnvironmentVariable<bool>("COSMOS_DISABLE_VM_METADATA_ACCESS", System.Diagnostics.Debugger.IsAttached);
if (isVMMetadataAccessDisabled)
{
return;
}

lock (VmMetadataApiHandler.lockObject)
else
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{
if (VmMetadataApiHandler.isInitialized)
{
return;
}

DefaultTrace.TraceInformation("Initializing VM Metadata API ");
lock (VmMetadataApiHandler.lockObject)
{
if (VmMetadataApiHandler.isInitialized)
{
return;
}

DefaultTrace.TraceInformation("Initializing VM Metadata API ");

VmMetadataApiHandler.isInitialized = true;
VmMetadataApiHandler.isInitialized = true;

_ = Task.Run(() => MetadataApiCallAsync(httpClient), default);
_ = Task.Run(() => MetadataApiCallAsync(httpClient), default);
}
}

}

private static async Task MetadataApiCallAsync(CosmosHttpClient httpClient)
Expand Down
44 changes: 31 additions & 13 deletions Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/VmMetadataApiHandlerTest.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,15 +17,14 @@ namespace Microsoft.Azure.Cosmos
using Microsoft.Azure.Cosmos.Telemetry.Models;
using Microsoft.Azure.Cosmos.Tests;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Moq;
using Newtonsoft.Json;
using Util;

[TestClass]
public class VmMetadataApiHandlerTest
{
[TestInitialize]
public void Intialize()
public void Initialize()
{
var isInitializedField = typeof(VmMetadataApiHandler).GetField("isInitialized",
BindingFlags.Static |
Expand All @@ -39,8 +38,12 @@ public void Intialize()
}

[TestMethod]
public async Task GetVmIdAsMachineIdTest()
[DataRow("true", DisplayName = "When COSMOS_DISABLE_VM_METADATA_ACCESS is set as true, VM ID should not be fetched")]
[DataRow("false", DisplayName = "When COSMOS_DISABLE_VM_METADATA_ACCESS is set as false, VM ID should be fetched")]
public async Task GetVmIdAsMachineIdTest(string isVmMetadataAccessDisabled)
{
Environment.SetEnvironmentVariable("COSMOS_DISABLE_VM_METADATA_ACCESS", isVmMetadataAccessDisabled);

static Task<HttpResponseMessage> sendFunc(HttpRequestMessage request, CancellationToken cancellationToken)
{
object jsonObject = JsonConvert.DeserializeObject("{\"compute\":{\"azEnvironment\":\"AzurePublicCloud\",\"customData\":\"\",\"isHostCompatibilityLayerVm\":\"false\",\"licenseType\":\"\",\"location\":\"eastus\",\"name\":\"sourabh-testing\",\"offer\":\"UbuntuServer\",\"osProfile\":{\"adminUsername\":\"azureuser\",\"computerName\":\"sourabh-testing\"},\"osType\":\"Linux\",\"placementGroupId\":\"\",\"plan\":{\"name\":\"\",\"product\":\"\",\"publisher\":\"\"},\"platformFaultDomain\":\"0\",\"platformUpdateDomain\":\"0\",\"provider\":\"Microsoft.Compute\",\"publicKeys\":[{\"keyData\":\"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQC5uCeOAm3ehmhI+2PbMoMl17Eo\r\nqfHKCycSaBJsv9qxlmBOuFheSJc1XknJleXUSsuTO016/d1PyWpevnqOZNRksWoa\r\nJvQ23sDTxcK+X2OP3QlCUeX4cMjPXqlL8z1UYzU4Bx3fFvf8fs67G3N72sxWBw5P\r\nZyuXyhBm0NCe/2NYMKgEDT4ma8XszO0ikbhoPKbMbgHAQk/ktWQHNcqYOPQKEWqp\r\nEK1R0rjS2nmtovfScP/ZGXcvOpJ1/NDBo4dh1K+OxOGM/4PSH/F448J5Zy4eAyEk\r\nscys+IpeIOTOlRUy/703SNIX0LEWlnYqbyL9c1ypcYLQqF76fKkDfzzFI/OWVlGw\r\nhj/S9uP8iMsR+fhGIbn6MAa7O4DWPWLuedSp7KDYyjY09gqNJsfuaAJN4LiC6bPy\r\nhknm0PVLK3ux7EUOt+cZrHCdIFWbdOtxiPNIl1tkv9kV5aE5Aj2gJm4MeB9uXYhS\r\nOuksboBc0wyUGrl9+XZJ1+NlZOf7IjVi86CieK8= generated-by-azure\r\n\",\"path\":\"/home/azureuser/.ssh/authorized_keys\"}],\"publisher\":\"Canonical\",\"resourceGroupName\":\"sourabh-telemetry-sdk\",\"resourceId\":\"/subscriptions/8fba6d4f-7c37-4d13-9063-fd58ad2b86e2/resourceGroups/sourabh-telemetry-sdk/providers/Microsoft.Compute/virtualMachines/sourabh-testing\",\"securityProfile\":{\"secureBootEnabled\":\"false\",\"virtualTpmEnabled\":\"false\"},\"sku\":\"18.04-LTS\",\"storageProfile\":{\"dataDisks\":[],\"imageReference\":{\"id\":\"\",\"offer\":\"UbuntuServer\",\"publisher\":\"Canonical\",\"sku\":\"18.04-LTS\",\"version\":\"latest\"},\"osDisk\":{\"caching\":\"ReadWrite\",\"createOption\":\"FromImage\",\"diffDiskSettings\":{\"option\":\"\"},\"diskSizeGB\":\"30\",\"encryptionSettings\":{\"enabled\":\"false\"},\"image\":{\"uri\":\"\"},\"managedDisk\":{\"id\":\"/subscriptions/8fba6d4f-7c37-4d13-9063-fd58ad2b86e2/resourceGroups/sourabh-telemetry-sdk/providers/Microsoft.Compute/disks/sourabh-testing_OsDisk_1_9a54abfc5ba149c6a106bd9e5b558c2a\",\"storageAccountType\":\"Premium_LRS\"},\"name\":\"sourabh-testing_OsDisk_1_9a54abfc5ba149c6a106bd9e5b558c2a\",\"osType\":\"Linux\",\"vhd\":{\"uri\":\"\"},\"writeAcceleratorEnabled\":\"false\"}},\"subscriptionId\":\"8fba6d4f-7c37-4d13-9063-fd58ad2b86e2\",\"tags\":\"azsecpack:nonprod;platformsettings.host_environment.service.platform_optedin_for_rootcerts:true\",\"tagsList\":[{\"name\":\"azsecpack\",\"value\":\"nonprod\"},{\"name\":\"platformsettings.host_environment.service.platform_optedin_for_rootcerts\",\"value\":\"true\"}],\"version\":\"18.04.202103250\",\"vmId\":\"d0cb93eb-214b-4c2b-bd3d-cc93e90d9efd\",\"vmScaleSetName\":\"\",\"vmSize\":\"Standard_D2s_v3\",\"zone\":\"1\"},\"network\":{\"interface\":[{\"ipv4\":{\"ipAddress\":[{\"privateIpAddress\":\"10.0.7.5\",\"publicIpAddress\":\"\"}],\"subnet\":[{\"address\":\"10.0.7.0\",\"prefix\":\"24\"}]},\"ipv6\":{\"ipAddress\":[]},\"macAddress\":\"000D3A8F8BA0\"}]}}");
Expand All @@ -53,13 +56,28 @@ static Task<HttpResponseMessage> sendFunc(HttpRequestMessage request, Cancellati
}

HttpMessageHandler messageHandler = new MockMessageHandler(sendFunc);
CosmosHttpClient cosmoshttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));
CosmosHttpClient cosmosHttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));

VmMetadataApiHandler.TryInitialize(cosmoshttpClient);
VmMetadataApiHandler.TryInitialize(cosmosHttpClient);

await Task.Delay(2000);
Assert.AreEqual($"{VmMetadataApiHandler.VmIdPrefix}{"d0cb93eb-214b-4c2b-bd3d-cc93e90d9efd"}", VmMetadataApiHandler.GetMachineId());
Assert.AreEqual(VmMetadataApiHandler.GetMachineRegion(), "eastus");

if (isVmMetadataAccessDisabled != null &&
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Boolean.TryParse(isVmMetadataAccessDisabled, out bool isVmMetadataAccessDisabledBool) &&
isVmMetadataAccessDisabledBool)
{
Assert.AreNotEqual($"{VmMetadataApiHandler.VmIdPrefix}{"d0cb93eb-214b-4c2b-bd3d-cc93e90d9efd"}", VmMetadataApiHandler.GetMachineId());
Assert.IsNull(VmMetadataApiHandler.GetMachineRegion(), VmMetadataApiHandler.GetMachineRegion());

Environment.SetEnvironmentVariable("COSMOS_DISABLE_VM_METADATA_ACCESS", "false");
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}
else
{
Assert.AreEqual($"{VmMetadataApiHandler.VmIdPrefix}{"d0cb93eb-214b-4c2b-bd3d-cc93e90d9efd"}", VmMetadataApiHandler.GetMachineId());
Assert.AreEqual(VmMetadataApiHandler.GetMachineRegion(), "eastus");
}

Environment.SetEnvironmentVariable("COSMOS_DISABLE_VM_METADATA_ACCESS", null);
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}

[TestMethod]
Expand All @@ -77,9 +95,9 @@ static Task<HttpResponseMessage> sendFunc(HttpRequestMessage request, Cancellati
}

HttpMessageHandler messageHandler = new MockMessageHandler(sendFunc);
CosmosHttpClient cosmoshttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));
CosmosHttpClient cosmosHttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));

VmMetadataApiHandler.TryInitialize(cosmoshttpClient);
VmMetadataApiHandler.TryInitialize(cosmosHttpClient);

await Task.Delay(2000);
Assert.IsNull(VmMetadataApiHandler.GetMachineInfo());
Expand All @@ -95,9 +113,9 @@ public async Task GetHashedMachineNameAsMachineIdTest()
static Task<HttpResponseMessage> sendFunc(HttpRequestMessage request, CancellationToken cancellationToken) { throw new Exception("error while making API call"); };

HttpMessageHandler messageHandler = new MockMessageHandler(sendFunc);
CosmosHttpClient cosmoshttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));
CosmosHttpClient cosmosHttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));

VmMetadataApiHandler.TryInitialize(cosmoshttpClient);
VmMetadataApiHandler.TryInitialize(cosmosHttpClient);

await Task.Delay(2000);
Assert.AreEqual(expectedMachineId, VmMetadataApiHandler.GetMachineId());
Expand Down Expand Up @@ -139,7 +157,7 @@ public void CatchMetadataApiCallExceptionTest()
static Task<HttpResponseMessage> sendFunc(HttpRequestMessage request, CancellationToken cancellationToken) { throw new Exception("error while making API call"); };

HttpMessageHandler messageHandler = new MockMessageHandler(sendFunc);
CosmosHttpClient cosmoshttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));
CosmosHttpClient cosmosHttpClient = MockCosmosUtil.CreateCosmosHttpClient(() => new HttpClient(messageHandler));

string expectedMsg = "Azure Environment metadata information not available.";
ManualResetEvent manualResetEvent = new ManualResetEvent(false);
Expand All @@ -155,7 +173,7 @@ void TraceHandler(string message)
DefaultTrace.TraceSource.Listeners.Add(new TestTraceListener { Callback = TraceHandler });
DefaultTrace.InitEventListener();

VmMetadataApiHandler.TryInitialize(cosmoshttpClient);
VmMetadataApiHandler.TryInitialize(cosmosHttpClient);

int timeout = 30000;
Assert.IsTrue(manualResetEvent.WaitOne(timeout));
Expand Down