test: Add integration tests for Audit logging.

tests/Agent/IntegrationTests/IntegrationTestHelpers/AuditLogFile.cs

@@ -0,0 +1,82 @@
+// Copyright 2020 New Relic, Inc. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Diagnostics.Contracts;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using Xunit.Abstractions;
+
+namespace NewRelic.Agent.IntegrationTestHelpers
+{
+    public class AuditLogFile : AgentLogBase
+    {
+        private readonly string _filePath;
+        private readonly string _fileName;
+
+        public bool Found => File.Exists(_filePath);
+
+        public AuditLogFile(string logDirectoryPath, ITestOutputHelper testLogger, string fileName = "", TimeSpan? timeoutOrZero = null, bool throwIfNotFound = true)
+            : base(testLogger)
+        {
+            Contract.Assert(logDirectoryPath != null);
+
+            _fileName = fileName;
+
+            var timeout = timeoutOrZero ?? TimeSpan.Zero;
+
+            var timeTaken = Stopwatch.StartNew();
+
+            var searchPattern = _fileName != string.Empty ? _fileName : "*_audit.log";
+
+            do
+            {
+                var mostRecentlyUpdatedFile = Directory.Exists(logDirectoryPath) ?
+                    Directory.GetFiles(logDirectoryPath, searchPattern)
+                        .OrderByDescending(File.GetLastWriteTimeUtc)
+                        .FirstOrDefault() : null;
+
+                if (mostRecentlyUpdatedFile != null)
+                {
+                    _filePath = mostRecentlyUpdatedFile;
+                    return;
+                }
+
+                Thread.Sleep(TimeSpan.FromSeconds(1));
+            } while (timeTaken.Elapsed < timeout);
+
+            if (throwIfNotFound)
+                throw new Exception($"Waited {timeout.TotalSeconds:N0}s but didn't find an audit log matching {Path.Combine(logDirectoryPath, searchPattern)}.");
+        }
+
+        public override IEnumerable<string> GetFileLines()
+        {
+            if (!Found)
+                yield break;
+
+            string line;
+            using (var fileStream = new FileStream(_filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+            using (var streamReader = new StreamReader(fileStream))
+                while ((line = streamReader.ReadLine()) != null)
+                {
+                    yield return line;
+                }
+        }
+
+        public string GetFullLogAsString()
+        {
+            using (var fileStream = new FileStream(_filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
+            using (var streamReader = new StreamReader(fileStream))
+            {
+                return streamReader.ReadToEnd();
+            }
+        }
+
+        public const string AuditLogLinePrefixRegex = @"^.*?NewRelic Audit: ";
+        public const string AuditDataSentLogLineRegex = AuditLogLinePrefixRegex + "Data Sent from the InstrumentedApp : .*";
+        public const string AuditDataReceivedLogLineRegex = AuditLogLinePrefixRegex + "Data Received from the Collector : .*";
+    }
+}

tests/Agent/IntegrationTests/IntegrationTestHelpers/NewRelicConfigModifier.cs

@@ -414,5 +414,11 @@ public NewRelicConfigModifier EnableAspNetCore6PlusBrowserInjection(bool enableB
             CommonUtils.ModifyOrCreateXmlAttributeInNewRelicConfig(_configFilePath, new[] { "configuration", "appSettings", "add"}, "value", $"{enableBrowserInjection}");
             return this;
         }
+
+        public void EnableAuditLog(bool enableAuditLog)
+        {
+            CommonUtils.ModifyOrCreateXmlAttributeInNewRelicConfig(_configFilePath, new[] { "configuration", "log" }, "auditLog",
+                enableAuditLog.ToString().ToLower());
+        }
     }
 }

tests/Agent/IntegrationTests/IntegrationTestHelpers/RemoteServiceFixtures/RemoteApplicationFixture.cs

@@ -54,6 +54,10 @@ public void SetTestClassType(Type testClassType)
 
         public AgentLogFile AgentLog => _agentLogFile ?? (_agentLogFile = new AgentLogFile(DestinationNewRelicLogFileDirectoryPath, TestLogger, AgentLogFileName, Timing.TimeToWaitForLog, AgentLogExpected));
 
+        private AuditLogFile _auditLogFile;
+        public bool AuditLogExpected { get; set; } = false;
+        public AuditLogFile AuditLog => _auditLogFile ?? (_auditLogFile = new AuditLogFile(DestinationNewRelicLogFileDirectoryPath, TestLogger, timeoutOrZero: Timing.TimeToWaitForLog, throwIfNotFound: AuditLogExpected));
+
 
         public ProfilerLogFile ProfilerLog { get { return RemoteApplication.ProfilerLog; } }
 

tests/Agent/IntegrationTests/IntegrationTests/Logging/AuditLogTests.cs

@@ -0,0 +1,59 @@
+// Copyright 2020 New Relic, Inc. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+using System;
+using System.Linq;
+using NewRelic.Agent.IntegrationTestHelpers;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace NewRelic.Agent.IntegrationTests.Logging.AuditLog
+{
+    [NetCoreTest]
+    public class AuditLogTests : NewRelicIntegrationTest<RemoteServiceFixtures.AspNetCoreMvcBasicRequestsFixture>
+    {
+        private readonly RemoteServiceFixtures.AspNetCoreMvcBasicRequestsFixture _fixture;
+
+        public AuditLogTests(RemoteServiceFixtures.AspNetCoreMvcBasicRequestsFixture  fixture, ITestOutputHelper output) :
+            base(fixture)
+        {
+            _fixture = fixture;
+            _fixture.TestLogger = output;
+
+            _fixture.AuditLogExpected = true;
+
+            _fixture.AddActions
+            (
+                setupConfiguration: () =>
+                {
+                    var configModifier = new NewRelicConfigModifier(fixture.DestinationNewRelicConfigFilePath);
+
+                    configModifier.EnableAuditLog(true);
+                },
+                exerciseApplication: () =>
+                {
+                    _fixture.Get();
+
+                    _fixture.AgentLog.WaitForLogLine(AgentLogBase.ShutdownLogLineRegex, TimeSpan.FromMinutes(2));
+                }
+            );
+
+            _fixture.Initialize();
+
+        }
+
+        [Fact]
+        public void AuditLogExistsAndHasSentAndReceivedData()
+        {
+            Assert.True(_fixture.AuditLog.Found);
+
+            var dataSentLogLines =  _fixture.AuditLog.TryGetLogLines(AuditLogFile.AuditDataSentLogLineRegex).ToList();
+            var dataReceivedLogLines = _fixture.AuditLog.TryGetLogLines(AuditLogFile.AuditDataReceivedLogLineRegex).ToList();
+
+            Assert.Multiple(() =>
+            {
+                Assert.True(dataSentLogLines.Count == 2 * dataReceivedLogLines.Count); // audit log always contains 2 "sent" lines for every "received" line
+            });
+        }
+    }
+}