Westinm/downstreamapi-logging

src/Microsoft.Identity.Web.DownstreamApi/DownstreamApi.HttpMethods.cs

@@ -6,6 +6,7 @@
 using System.Security.Claims;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 using Microsoft.Identity.Abstractions;
 
 namespace Microsoft.Identity.Web
@@ -22,9 +23,23 @@ internal partial class DownstreamApi : IDownstreamApi
             where TOutput : class
         {
             DownstreamApiOptions effectiveOptions = MergeOptions(serviceName, downstreamApiOptionsOverride, HttpMethod.Get);
-            HttpResponseMessage response = await CallApiInternalAsync(serviceName, effectiveOptions, false, null, user, cancellationToken).ConfigureAwait(false);
-
-            return await DeserializeOutput<TOutput>(response, effectiveOptions).ConfigureAwait(false);
+
+            try
+            {
+                HttpResponseMessage response = await CallApiInternalAsync(serviceName, effectiveOptions, false, null, user, cancellationToken).ConfigureAwait(false);
+                return await DeserializeOutput<TOutput>(response, effectiveOptions).ConfigureAwait(false);
+            }
+            catch(Exception ex) when (
+                ex is InvalidOperationException
+                || ex is HttpRequestException)
+            {
+                Logger.HttpRequestError(
+                    _logger, 
+                    serviceName!,
+                    effectiveOptions.BaseUrl!, 
+                    effectiveOptions.RelativePath!, ex);
+                throw;
+            }
         }
 
         /// <inheritdoc/>

src/Microsoft.Identity.Web.DownstreamApi/DownstreamApi.Logger.cs

@@ -0,0 +1,58 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using System;
+using System.Collections;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.Identity.Web
+{
+    /// <summary>
+    /// LoggerMessage class for DownstreamApi
+    /// </summary>
+    internal partial class DownstreamApi
+    {
+        internal static class Logger
+        {
+            private static readonly Action<ILogger, string, string, string, Exception?> s_httpRequestError =
+                LoggerMessage.Define<string, string, string>(
+                    LogLevel.Debug, 
+                    DownstreamApiLoggingEventId.HttpRequestError, 
+                    "[MsIdWeb] An error occurred during HTTP Request. " + 
+                    "ServiceName: {serviceName}, " +
+                    "BaseUrl: {BaseUrl}, " +
+                    "RelativePath: {RelativePath} ");
+
+            private static readonly Action<ILogger, Exception?> s_unauthenticatedApiCall =
+                LoggerMessage.Define(
+                    LogLevel.Information,
+                    DownstreamApiLoggingEventId.UnauthenticatedApiCall, 
+                    "[MsIdWeb] An unauthenticated call was made to the Api with null Scopes");
+
+
+            /// <summary>
+            /// Logger for handling options exceptions in DownstreamApi
+            /// </summary>
+            /// <param name="logger">ILogger</param>
+            /// <param name="ServiceName">Name of Api receiving request</param>
+            /// <param name="BaseUrl">Base url from appsettings.</param>
+            /// <param name="RelativePath">Relative path from appsettings.</param>
+            /// <param name="ex">Exception</param>
+            public static void HttpRequestError(
+                ILogger logger, 
+                string ServiceName,
+                string BaseUrl, 
+                string RelativePath, 
+                Exception? ex) => s_httpRequestError(logger, ServiceName, BaseUrl, RelativePath, ex);
+
+            /// <summary>
+            /// Logger for unauthenticated internal Api call in DownstreamApi
+            /// </summary>
+            /// <param name="logger">Logger</param>
+            /// <param name="ex">Exception</param>
+            public static void UnauthenticatedApiCall(
+                ILogger logger,
+                Exception? ex) => s_unauthenticatedApiCall(logger, ex);
+        }
+    }
+}

src/Microsoft.Identity.Web.DownstreamApi/DownstreamApi.cs

@@ -10,6 +10,7 @@
 using System.Text.Json;
 using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Microsoft.Identity.Abstractions;
 
@@ -23,21 +24,25 @@ internal partial class DownstreamApi : IDownstreamApi
         private readonly IOptionsMonitor<DownstreamApiOptions> _namedDownstreamApiOptions;
         private const string ScopesNotConfiguredInConfigurationOrViaDelegate = "IDW10107: Scopes need to be passed-in either by configuration or by the delegate overriding it. ";
         private const string Authorization = "Authorization";
+        protected readonly ILogger<DownstreamApi> _logger;
 
         /// <summary>
         /// Constructor.
         /// </summary>
         /// <param name="authorizationHeaderProvider">Authorization header provider.</param>
         /// <param name="namedDownstreamApiOptions">Named options provider.</param>
         /// <param name="httpClientFactory">HTTP client factory.</param>
+        /// <param name="logger">Logger.</param>
         public DownstreamApi(
             IAuthorizationHeaderProvider authorizationHeaderProvider,
             IOptionsMonitor<DownstreamApiOptions> namedDownstreamApiOptions,
-            IHttpClientFactory httpClientFactory)
+            IHttpClientFactory httpClientFactory,
+            ILogger<DownstreamApi> logger)
         {
             _authorizationHeaderProvider = authorizationHeaderProvider;
             _namedDownstreamApiOptions = namedDownstreamApiOptions;
             _httpClientFactory = httpClientFactory;
+            _logger = logger;
         }
 
         /// <inheritdoc/>
@@ -306,6 +311,10 @@ await _authorizationHeaderProvider.CreateAuthorizationHeaderForUserAsync(
                                             cancellationToken).ConfigureAwait(false);
                 httpRequestMessage.Headers.Add(Authorization, authorizationHeader);
             }
+            else
+            {
+                Logger.UnauthenticatedApiCall(_logger, null);
+            }
             // Opportunity to change the request message
             effectiveOptions.CustomizeHttpRequestMessage?.Invoke(httpRequestMessage);
 

src/Microsoft.Identity.Web.DownstreamApi/DownstreamApiLoggingEventId.cs

@@ -0,0 +1,16 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.Identity.Web
+{
+    internal static class DownstreamApiLoggingEventId
+    {
+#pragma warning disable IDE1006 // Naming styles
+        // DownstreamApi EventIds 100+
+        public static readonly EventId HttpRequestError = new EventId(100, "HttpRequestError");
+        public static readonly EventId UnauthenticatedApiCall = new EventId(101, "UnauthenticatedApiCall");
+#pragma warning restore IDE1006 // Naming styles
+    }
+}