[ResourceDetector.Host] Add host.id for non-containerized systems

src/OpenTelemetry.ResourceDetectors.Host/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+* Adds support for `host.id` resource attribute on non-containerized systems.
+`host.id` will be set per [semantic convention rules](https://github.com/open-telemetry/semantic-conventions/blob/v1.24.0/docs/resource/host.md)
+  ([#1631](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1631))
+
 ## 0.1.0-alpha.3
 
 Released 2024-Apr-05

src/OpenTelemetry.ResourceDetectors.Host/HostDetector.cs

@@ -3,6 +3,10 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using Microsoft.Win32;
 using OpenTelemetry.Resources;
 
 namespace OpenTelemetry.ResourceDetectors.Host;
@@ -12,6 +16,40 @@ namespace OpenTelemetry.ResourceDetectors.Host;
 /// </summary>
 public sealed class HostDetector : IResourceDetector
 {
+    private const string ETCMACHINEID = "/etc/machine-id";
+    private const string ETCVARDBUSMACHINEID = "/var/lib/dbus/machine-id";
+    private readonly PlatformID platformId;
+    private readonly Func<IEnumerable<string>> getFilePaths;
+    private readonly Func<string?> getMacOsMachineId;
+    private readonly Func<string?> getWindowsMachineId;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="HostDetector"/> class.
+    /// </summary>
+    public HostDetector()
+        : this(
+        Environment.OSVersion.Platform,
+        GetFilePaths,
+        GetMachineIdMacOs,
+        GetMachineIdWindows)
+    {
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="HostDetector"/> class for testing.
+    /// </summary>
+    /// <param name="platformId">Target platform ID.</param>
+    /// <param name="getFilePaths">Function to get Linux file paths to probe.</param>
+    /// <param name="getMacOsMachineId">Function to get MacOS machine ID.</param>
+    /// <param name="getWindowsMachineId">Function to get Windows machine ID.</param>
+    internal HostDetector(PlatformID platformId, Func<IEnumerable<string>> getFilePaths, Func<string?> getMacOsMachineId, Func<string?> getWindowsMachineId)
+    {
+        this.platformId = platformId;
+        this.getFilePaths = getFilePaths ?? throw new ArgumentNullException(nameof(getFilePaths));
+        this.getMacOsMachineId = getMacOsMachineId ?? throw new ArgumentNullException(nameof(getMacOsMachineId));
+        this.getWindowsMachineId = getWindowsMachineId ?? throw new ArgumentNullException(nameof(getWindowsMachineId));
+    }
+
     /// <summary>
     /// Detects the resource attributes from host.
     /// </summary>
@@ -20,10 +58,18 @@ public Resource Detect()
     {
         try
         {
-            return new Resource(new List<KeyValuePair<string, object>>(1)
+            var attributes = new List<KeyValuePair<string, object>>(2)
             {
                 new(HostSemanticConventions.AttributeHostName, Environment.MachineName),
-            });
+            };
+            var machineId = this.GetMachineId();
+
+            if (machineId != null && !string.IsNullOrEmpty(machineId))
+            {
+                attributes.Add(new(HostSemanticConventions.AttributeHostId, machineId));
+            }
+
+            return new Resource(attributes);
         }
         catch (InvalidOperationException ex)
         {
@@ -33,4 +79,118 @@ public Resource Detect()
 
         return Resource.Empty;
     }
+
+    internal static string? ParseMacOsOutput(string? output)
+    {
+        if (output == null || string.IsNullOrEmpty(output))
+        {
+            return null;
+        }
+
+        var lines = output.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
+
+        foreach (var line in lines)
+        {
+#if NETFRAMEWORK
+            if (line.IndexOf("IOPlatformUUID", StringComparison.OrdinalIgnoreCase) >= 0)
+#else
+            if (line.Contains("IOPlatformUUID", StringComparison.OrdinalIgnoreCase))
+#endif
+            {
+                var parts = line.Split('"');
+
+                if (parts.Length > 3)
+                {
+                    return parts[3];
+                }
+            }
+        }
+
+        return null;
+    }
+
+    private static IEnumerable<string> GetFilePaths()
+    {
+        yield return ETCMACHINEID;
+        yield return ETCVARDBUSMACHINEID;
+    }
+
+    private static string? GetMachineIdMacOs()
+    {
+        try
+        {
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = "sh",
+                Arguments = "ioreg -rd1 -c IOPlatformExpertDevice",
+                UseShellExecute = false,
+                CreateNoWindow = true,
+                RedirectStandardOutput = true,
+            };
+
+            var sb = new StringBuilder();
+            using var process = Process.Start(startInfo);
+            process?.WaitForExit();
+            sb.Append(process?.StandardOutput.ReadToEnd());
+            return sb.ToString();
+        }
+        catch (Exception ex)
+        {
+            HostResourceEventSource.Log.ResourceAttributesExtractException(nameof(HostDetector), ex);
+        }
+
+        return null;
+    }
+
+#pragma warning disable CA1416
+    // stylecop wants this protected by System.OperatingSystem.IsWindows
+    // this type only exists in .NET 5+
+    private static string? GetMachineIdWindows()
+    {
+        try
+        {
+            using var subKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Cryptography", false);
+            return subKey?.GetValue("MachineGuid") as string ?? null;
+        }
+        catch (Exception ex)
+        {
+            HostResourceEventSource.Log.ResourceAttributesExtractException(nameof(HostDetector), ex);
+        }
+
+        return null;
+    }
+#pragma warning restore CA1416
+
+    private string? GetMachineId()
+    {
+        return this.platformId switch
+        {
+            PlatformID.Unix => this.GetMachineIdLinux(),
+            PlatformID.MacOSX => ParseMacOsOutput(this.getMacOsMachineId()),
+            PlatformID.Win32NT => this.getWindowsMachineId(),
+            _ => null,
+        };
+    }
+
+    private string? GetMachineIdLinux()
+    {
+        var paths = this.getFilePaths();
+
+        foreach (var path in paths)
+        {
+            if (File.Exists(path))
+            {
+                try
+                {
+                    return File.ReadAllText(path).Trim();
+                }
+                catch (Exception ex)
+                {
+                    HostResourceEventSource.Log.ResourceAttributesExtractException(nameof(HostDetector), ex);
+                }
+            }
+        }
+
+        return null;
+    }
 }

src/OpenTelemetry.ResourceDetectors.Host/HostSemanticConventions.cs

@@ -6,4 +6,5 @@ namespace OpenTelemetry.ResourceDetectors.Host;
 internal static class HostSemanticConventions
 {
     public const string AttributeHostName = "host.name";
+    public const string AttributeHostId = "host.id";
 }

src/OpenTelemetry.ResourceDetectors.Host/README.md

@@ -36,7 +36,7 @@ var tracerProvider = Sdk.CreateTracerProviderBuilder()
 The resource detectors will record the following metadata based on where
 your application is running:
 
-- **HostDetector**: `host.name`.
+- **HostDetector**: `host.id` (when running on non-containerized systems), `host.name`.
 
 ## References
 

test/OpenTelemetry.ResourceDetectors.Host.Tests/HostDetectorTests.cs

@@ -1,6 +1,8 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using OpenTelemetry.Resources;
 using Xunit;
@@ -9,15 +11,116 @@ namespace OpenTelemetry.ResourceDetectors.Host.Tests;
 
 public class HostDetectorTests
 {
+    private const string MacOSMachineIdOutput = @"+-o J293AP  <class IOPlatformExpertDevice, id 0x100000227, registered, matched,$
+        {
+          ""IOPolledInterface"" = ""AppleARMWatchdogTimerHibernateHandler is not seria$
+          ""#address-cells"" = <02000000>
+          ""AAPL,phandle"" = <01000000>
+          ""serial-number"" = <432123465233514651303544000000000000000000000000000000$
+          ""IOBusyInterest"" = ""IOCommand is not serializable""
+          ""target-type"" = <""J293"">
+          ""platform-name"" = <743831303300000000000000000000000000000000000000000000$
+          ""secure-root-prefix"" = <""md"">
+          ""name"" = <""device-tree"">
+          ""region-info"" = <4c4c2f41000000000000000000000000000000000000000000000000$
+          ""manufacturer"" = <""Apple Inc."">
+          ""compatible"" = <""J293AP"",""MacBookPro17,1"",""AppleARM"">
+          ""config-number"" = <000000000000000000000000000000000000000000000000000000$
+          ""IOPlatformSerialNumber"" = ""A01BC3QFQ05D""
+          ""regulatory-model-number"" = <41323333380000000000000000000000000000000000$
+          ""time-stamp"" = <""Mon Jun 27 20:12:10 PDT 2022"">
+          ""clock-frequency"" = <00366e01>
+          ""model"" = <""MacBookPro17,1"">
+          ""mlb-serial-number"" = <432123413230363030455151384c4c314a0000000000000000$
+          ""model-number"" = <4d59443832000000000000000000000000000000000000000000000$
+          ""IONWInterrupts"" = ""IONWInterrupts""
+          ""model-config"" = <""SUNWAY;MoPED=0x803914B08BE6C5AF0E6C990D7D8240DA4CAC2FF$
+          ""device_type"" = <""bootrom"">
+          ""#size-cells"" = <02000000>
+          ""IOPlatformUUID"" = ""1AB2345C-03E4-57D4-A375-1234D48DE123""
+        }";
+
+    private static readonly IEnumerable<string> ETCMACHINEID = new[] { "Samples/etc_machineid" };
+    private static readonly IEnumerable<string> ETCVARDBUSMACHINEID = new[] { "Samples/etc_var_dbus_machineid" };
+
     [Fact]
     public void TestHostAttributes()
     {
         var resource = ResourceBuilder.CreateEmpty().AddDetector(new HostDetector()).Build();
 
         var resourceAttributes = resource.Attributes.ToDictionary(x => x.Key, x => (string)x.Value);
 
-        Assert.Single(resourceAttributes);
+        Assert.Equal(2, resourceAttributes.Count);
 
         Assert.NotEmpty(resourceAttributes[HostSemanticConventions.AttributeHostName]);
+        Assert.NotEmpty(resourceAttributes[HostSemanticConventions.AttributeHostId]);
+    }
+
+    [Fact]
+    public void TestHostMachineIdLinux()
+    {
+        var combos = new[]
+        {
+            (Enumerable.Empty<string>(), null),
+            (ETCMACHINEID, "etc_machineid"),
+            (ETCVARDBUSMACHINEID, "etc_var_dbus_machineid"),
+            (Enumerable.Concat(ETCMACHINEID, ETCVARDBUSMACHINEID), "etc_machineid"),
+        };
+
+        foreach (var (path, expected) in combos)
+        {
+            var detector = new HostDetector(
+                PlatformID.Unix,
+                () => path,
+                () => throw new Exception("should not be called"),
+                () => throw new Exception("should not be called"));
+            var resource = ResourceBuilder.CreateEmpty().AddDetector(detector).Build();
+            var resourceAttributes = resource.Attributes.ToDictionary(x => x.Key, x => (string)x.Value);
+
+            if (string.IsNullOrEmpty(expected))
+            {
+                Assert.False(resourceAttributes.ContainsKey(HostSemanticConventions.AttributeHostId));
+            }
+            else
+            {
+                Assert.NotEmpty(resourceAttributes[HostSemanticConventions.AttributeHostId]);
+                Assert.Equal(expected, resourceAttributes[HostSemanticConventions.AttributeHostId]);
+            }
+        }
+    }
+
+    [Fact]
+    public void TestHostMachineIdMacOs()
+    {
+        var detector = new HostDetector(
+            PlatformID.MacOSX,
+            () => Enumerable.Empty<string>(),
+            () => MacOSMachineIdOutput,
+            () => throw new Exception("should not be called"));
+        var resource = ResourceBuilder.CreateEmpty().AddDetector(detector).Build();
+        var resourceAttributes = resource.Attributes.ToDictionary(x => x.Key, x => (string)x.Value);
+        Assert.NotEmpty(resourceAttributes[HostSemanticConventions.AttributeHostId]);
+        Assert.Equal("1AB2345C-03E4-57D4-A375-1234D48DE123", resourceAttributes[HostSemanticConventions.AttributeHostId]);
+    }
+
+    [Fact]
+    public void TestParseMacOsOutput()
+    {
+        var id = HostDetector.ParseMacOsOutput(MacOSMachineIdOutput);
+        Assert.Equal("1AB2345C-03E4-57D4-A375-1234D48DE123", id);
+    }
+
+    [Fact]
+    public void TestHostMachineIdWindows()
+    {
+        var detector = new HostDetector(
+            PlatformID.Win32NT,
+            () => Enumerable.Empty<string>(),
+            () => throw new Exception("should not be called"),
+            () => "windows-machine-id");
+        var resource = ResourceBuilder.CreateEmpty().AddDetector(detector).Build();
+        var resourceAttributes = resource.Attributes.ToDictionary(x => x.Key, x => (string)x.Value);
+        Assert.NotEmpty(resourceAttributes[HostSemanticConventions.AttributeHostId]);
+        Assert.Equal("windows-machine-id", resourceAttributes[HostSemanticConventions.AttributeHostId]);
     }
 }

test/OpenTelemetry.ResourceDetectors.Host.Tests/OpenTelemetry.ResourceDetectors.Host.Tests.csproj

@@ -11,4 +11,13 @@
     <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.ResourceDetectors.Host\OpenTelemetry.ResourceDetectors.Host.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="Samples\etc_machineid">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="Samples\etc_var_dbus_machineid">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

test/OpenTelemetry.ResourceDetectors.Host.Tests/Samples/etc_machineid

@@ -0,0 +1 @@
+etc_machineid

test/OpenTelemetry.ResourceDetectors.Host.Tests/Samples/etc_var_dbus_machineid

@@ -0,0 +1 @@
+etc_var_dbus_machineid