Azure Monitor Exporter - Add Connection String

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/AzureMonitorTraceExporter.cs

@@ -12,7 +12,7 @@ namespace OpenTelemetry.Exporter.AzureMonitor
 {
     public class AzureMonitorTraceExporter : ActivityExporter
     {
-        private readonly AzureMonitorTransmitter AzureMonitorTransmitter;
+        internal readonly AzureMonitorTransmitter AzureMonitorTransmitter;
 
         public AzureMonitorTraceExporter(AzureMonitorExporterOptions options)
         {

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/AzureMonitorTraceExporterEventSource.cs

@@ -30,10 +30,22 @@ public void SdkVersionCreateFailed(Exception ex)
             }
         }
 
+        [NonEvent]
+        public void ConnectionStringError(Exception ex)
+        {
+            if (this.IsEnabled(EventLevel.Error, EventKeywords.All))
+            {
+                this.ConnectionStringError(ex.ToInvariantString());
+            }
+        }
+
         [Event(1, Message = "{0}", Level = EventLevel.Warning)]
         public void WarnToParseConfigurationString(string message) => this.WriteEvent(1, message);
 
         [Event(2, Message = "Error creating SdkVersion : '{0}'", Level = EventLevel.Warning)]
         public void WarnSdkVersionCreateException(string message) => this.WriteEvent(2, message);
+
+        [Event(3, Message = "Connection String Error: '{0}'", Level = EventLevel.Error)]
+        public void ConnectionStringError(string message) => this.WriteEvent(3, message);
     }
 }

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/AzureMonitorTransmitter.cs

@@ -9,15 +9,18 @@
 using System.Threading;
 using System.Threading.Tasks;
 using Azure.Core.Pipeline;
+
+using OpenTelemetry.Exporter.AzureMonitor.ConnectionString;
 using OpenTelemetry.Exporter.AzureMonitor.Models;
 using OpenTelemetry.Trace;
 
 namespace OpenTelemetry.Exporter.AzureMonitor
 {
     internal class AzureMonitorTransmitter
     {
-        private readonly ServiceRestClient serviceRestClient;
+        internal readonly ServiceRestClient serviceRestClient;
         private readonly AzureMonitorExporterOptions options;
+        internal readonly string ikey;
 
         private static readonly IReadOnlyDictionary<TelemetryType, string> Telemetry_Base_Type_Mapping = new Dictionary<TelemetryType, string>
         {
@@ -37,8 +40,10 @@ internal class AzureMonitorTransmitter
 
         public AzureMonitorTransmitter(AzureMonitorExporterOptions exporterOptions)
         {
+            ConnectionStringParser.GetValues(exporterOptions.ConnectionString, out this.ikey, out string endpoint);
+
             options = exporterOptions;
-            serviceRestClient = new ServiceRestClient(new ClientDiagnostics(options), HttpPipelineBuilder.Build(options));
+            serviceRestClient = new ServiceRestClient(new ClientDiagnostics(options), HttpPipelineBuilder.Build(options), endpoint: endpoint);
         }
 
         internal async ValueTask<int> AddBatchActivityAsync(IEnumerable<Activity> batchActivity, CancellationToken cancellationToken)
@@ -54,6 +59,7 @@ internal async ValueTask<int> AddBatchActivityAsync(IEnumerable<Activity> batchA
             foreach (var activity in batchActivity)
             {
                 telemetryItem = GeneratePartAEnvelope(activity);
+                telemetryItem.IKey = this.ikey;
                 telemetryItem.Data = GenerateTelemetryData(activity);
                 telemetryItems.Add(telemetryItem);
             }
@@ -67,8 +73,6 @@ private static TelemetryEnvelope GeneratePartAEnvelope(Activity activity)
         {
             // TODO: Get TelemetryEnvelope name changed in swagger
             TelemetryEnvelope envelope = new TelemetryEnvelope(PartA_Name_Mapping[activity.GetTelemetryType()], activity.StartTimeUtc);
-            // TODO: Extract IKey from connectionstring
-            envelope.IKey = "IKey";
             // TODO: Validate if Azure SDK has common function to generate role instance
             envelope.Tags[ContextTagKeys.AiCloudRoleInstance.ToString()] = "testRoleInstance";
 

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/ConnectionString/ConnectionStringParser.cs

@@ -0,0 +1,124 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Linq;
+
+namespace OpenTelemetry.Exporter.AzureMonitor.ConnectionString
+{
+    internal static class ConnectionStringParser
+    {
+        /// <summary>
+        /// Parse a connection string that matches the format: "key1=value1;key2=value2;key3=value3".
+        /// This method will encapsulate all exception handling.
+        /// </summary>
+        /// <remarks>
+        /// Official Doc: <a href="https://docs.microsoft.com/azure/azure-monitor/app/sdk-connection-string" />.
+        /// </remarks>
+        public static void GetValues(string connectionString, out string ikey, out string endpoint)
+        {
+            try
+            {
+                if (connectionString == null)
+                {
+                    throw new ArgumentNullException(nameof(connectionString));
+                }
+                else if (connectionString.Length > Constants.ConnectionStringMaxLength)
+                {
+                    throw new ArgumentOutOfRangeException(nameof(connectionString), $"Values greater than {Constants.ConnectionStringMaxLength} characters are not allowed.");
+                }
+
+                var connString = Azure.Core.ConnectionString.Parse(connectionString);
+                ikey = connString.GetInstrumentationKey();
+                endpoint = connString.GetIngestionEndpoint();
+            }
+            catch (Exception ex)
+            {
+                AzureMonitorTraceExporterEventSource.Log.ConnectionStringError(ex);
+                throw new Exception("Connection String Error: " + ex.Message, ex);
+            }
+        }
+
+        internal static string GetInstrumentationKey(this Azure.Core.ConnectionString connectionString) => connectionString.GetRequired(Constants.InstrumentationKeyKey);
+
+        /// <summary>
+        /// Will evaluate connection string and return the requested endpoint.
+        /// </summary>
+        /// <remarks>
+        /// Parsing the connection string MUST follow these rules:
+        ///     1. check for explicit endpoint (location is ignored)
+        ///     2. check for endpoint suffix (location is optional)
+        ///     3. use default endpoint (location is ignored)
+        /// This behavior is required by the Connection String Specification.
+        /// </remarks>
+        internal static string GetIngestionEndpoint(this Azure.Core.ConnectionString connectionString)
+        {
+            // Passing the user input values through the Uri constructor will verify that we've built a valid endpoint.
+            Uri uri;
+
+            if (connectionString.TryGetNonRequiredValue(Constants.IngestionExplicitEndpointKey, out string explicitEndpoint))
+            {
+                if (!Uri.TryCreate(explicitEndpoint, UriKind.Absolute, out uri))
+                {
+                    throw new ArgumentException($"The value for {Constants.IngestionExplicitEndpointKey} is invalid. '{explicitEndpoint}'");
+                }
+            }
+            else if (connectionString.TryGetNonRequiredValue(Constants.EndpointSuffixKey, out string endpointSuffix))
+            {
+                var location = connectionString.GetNonRequired(Constants.LocationKey);
+                if (!TryBuildUri(prefix: Constants.IngestionPrefix, suffix: endpointSuffix, location: location, uri: out uri))
+                {
+                    throw new ArgumentException($"The value for {Constants.EndpointSuffixKey} is invalid. '{endpointSuffix}'");
+                }
+            }
+            else
+            {
+                return Constants.DefaultIngestionEndpoint;
+            }
+
+            return uri.AbsoluteUri;
+        }
+
+        /// <summary>
+        /// Construct a Uri from the possible parts.
+        /// Format: "location.prefix.suffix".
+        /// Example: "https://westus2.dc.applicationinsights.azure.cn/".
+        /// </summary>
+        /// <remarks>
+        /// Will also attempt to sanitize user input. Won't fail if the user typo-ed an extra period.
+        /// </remarks>
+        internal static bool TryBuildUri(string prefix, string suffix, out Uri uri, string location = null)
+        {
+            // Location and Suffix are user input fields and need to be sanitized (extra spaces or periods).
+            char[] trimPeriod = new char[] { '.' };
+
+            if (location != null)
+            {
+                location = location.Trim().TrimEnd(trimPeriod);
+
+                // Location names are expected to match Azure region names. No special characters allowed.
+                if (!location.All(x => char.IsLetterOrDigit(x)))
+                {
+                    throw new ArgumentException($"The value for Location must not contain special characters. '{location}'");
+                }
+            }
+
+            var uriString = string.Concat("https://",
+                string.IsNullOrEmpty(location) ? string.Empty : (location + "."),
+                prefix,
+                ".",
+                suffix.Trim().TrimStart(trimPeriod));
+
+            return Uri.TryCreate(uriString, UriKind.Absolute, out uri);
+        }
+
+        /// <summary>
+        /// This method wraps <see cref="Azure.Core.ConnectionString.GetNonRequired(string)"/> in a null check.
+        /// </summary>
+        internal static bool TryGetNonRequiredValue(this Azure.Core.ConnectionString connectionString, string key, out string value)
+        {
+            value = connectionString.GetNonRequired(key);
+            return value != null;
+        }
+    }
+}

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/ConnectionString/Constants.cs

@@ -0,0 +1,49 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+namespace OpenTelemetry.Exporter.AzureMonitor.ConnectionString
+{
+    internal static class Constants
+    {
+        /// <summary>
+        /// Default endpoint for Ingestion (aka Breeze).
+        /// </summary>
+        internal const string DefaultIngestionEndpoint = "https://dc.services.visualstudio.com/";
+
+        /// <summary>
+        /// Sub-domain for Ingestion endpoint (aka Breeze). (https://dc.applicationinsights.azure.com/).
+        /// </summary>
+        internal const string IngestionPrefix = "dc";
+
+        /// <summary>
+        /// This is the key that a customer would use to specify an explicit endpoint in the connection string.
+        /// </summary>
+        internal const string IngestionExplicitEndpointKey = "IngestionEndpoint";
+
+        /// <summary>
+        /// This is the key that a customer would use to specify an instrumentation key in the connection string.
+        /// </summary>
+        internal const string InstrumentationKeyKey = "InstrumentationKey";
+
+        /// <summary>
+        /// This is the key that a customer would use to specify an endpoint suffix in the connection string.
+        /// </summary>
+        internal const string EndpointSuffixKey = "EndpointSuffix";
+
+        /// <summary>
+        /// This is the key that a customer would use to specify a location in the connection string.
+        /// </summary>
+        internal const string LocationKey = "Location";
+
+        /// <summary>
+        /// Maximum allowed length for connection string.
+        /// </summary>
+        /// <remarks>
+        /// Currently 8 accepted keywords (~200 characters).
+        /// Assuming 200 characters per value (~1600 characters).
+        /// Total theoretical max length: (1600 + 200) = 1800.
+        /// Setting an over-exaggerated max length to protect against malicious injections (2^12 = 4096).
+        /// </remarks>
+        internal const int ConnectionStringMaxLength = 4096;
+    }
+}

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/src/OpenTelemetry.Exporter.AzureMonitor.csproj

@@ -16,6 +16,7 @@
   <ItemGroup>
     <Compile Include="$(AzureCoreSharedSources)ArrayBufferWriter.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />
     <Compile Include="$(AzureCoreSharedSources)ClientDiagnostics.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />
+    <Compile Include="$(AzureCoreSharedSources)ConnectionString.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />
     <Compile Include="$(AzureCoreSharedSources)ContentTypeUtilities.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />
     <Compile Include="$(AzureCoreSharedSources)DiagnosticScope.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />
     <Compile Include="$(AzureCoreSharedSources)DiagnosticScopeFactory.cs" Link="Shared\%(RecursiveDir)\%(Filename)%(Extension)" />

sdk/monitor/OpenTelemetry.Exporter.AzureMonitor/tests/OpenTelemetry.Exporter.AzureMonitor.UnitTest/AzureMonitorTraceExporterTests.cs

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Reflection;
+
+using NUnit.Framework;
+
+namespace OpenTelemetry.Exporter.AzureMonitor
+{
+    public class AzureMonitorTraceExporterTests
+    {
+        [Test]
+        public void VerifyConnectionStringSetsEndpoint()
+        {
+            var testIkey = "test_ikey";
+            var testEndpoint = "https://www.bing.com/";
+
+            var exporter = new AzureMonitorTraceExporter(new AzureMonitorExporterOptions { ConnectionString = $"InstrumentationKey={testIkey};IngestionEndpoint={testEndpoint}" });
+
+            Assert.AreEqual(testIkey, exporter.AzureMonitorTransmitter.ikey);
+
+            // TODO: WHO OWNS THE SWAGGER? CAN WE CHANGE "endpoint" TO BE internal PLEASE?
+            FieldInfo field = typeof(ServiceRestClient).GetField("endpoint", BindingFlags.Instance | BindingFlags.NonPublic);
+            var serviceRestClientEndpoint = field.GetValue(exporter.AzureMonitorTransmitter.serviceRestClient);
+            Assert.AreEqual(testEndpoint, serviceRestClientEndpoint);
+        }
+
+        [Test]
+        public void VerifyInvalidConnectionStringThrowsException()
+        {
+            Assert.Throws<Exception>(() => new AzureMonitorTraceExporter(new AzureMonitorExporterOptions { ConnectionString = null }));
+        }
+    }
+}