Automatically detect and tune for Azure Managed Redis caches (#2818)

Detect when connecting to a new Azure Managed Redis cache, and adjust default connection settings to align with their capabilities. 

More about Azure Managed Redis: https://learn.microsoft.com/azure/azure-cache-for-redis/managed-redis/managed-redis-overview

docs/ReleaseNotes.md

@@ -10,6 +10,7 @@ Current package versions:
 
 - Format IPv6 endpoints correctly when rewriting configration strings ([#2813 by mgravell](https://github.com/StackExchange/StackExchange.Redis/pull/2813))
 - Update default Redis version from 4.0.0 to 6.0.0 for Azure Redis resources ([#2810 by philon-msft](https://github.com/StackExchange/StackExchange.Redis/pull/2810))
+- Detect Azure Managed Redis caches and tune default connection settings for them ([#2818 by philon-msft](https://github.com/StackExchange/StackExchange.Redis/pull/2818))
 
 ## 2.8.16
 

src/StackExchange.Redis/Configuration/AzureOptionsProvider.cs

@@ -21,31 +21,48 @@ public class AzureOptionsProvider : DefaultOptionsProvider
         public override Version DefaultVersion => RedisFeatures.v6_0_0;
 
         /// <summary>
-        /// List of domains known to be Azure Redis, so we can light up some helpful functionality
+        /// Lists of domains known to be Azure Redis, so we can light up some helpful functionality
         /// for minimizing downtime during maintenance events and such.
         /// </summary>
         private static readonly string[] azureRedisDomains = new[]
         {
             ".redis.cache.windows.net",
             ".redis.cache.chinacloudapi.cn",
             ".redis.cache.usgovcloudapi.net",
-            ".redis.cache.cloudapi.de",
             ".redisenterprise.cache.azure.net",
         };
 
+        private static readonly string[] azureManagedRedisDomains = new[]
+        {
+            ".redis.azure.net",
+            ".redis.chinacloudapi.cn",
+            ".redis.usgovcloudapi.net",
+        };
+
         /// <inheritdoc/>
         public override bool IsMatch(EndPoint endpoint)
         {
             if (endpoint is DnsEndPoint dnsEp)
             {
-                foreach (var host in azureRedisDomains)
+                if (IsHostInDomains(dnsEp.Host, azureRedisDomains) || IsHostInDomains(dnsEp.Host, azureManagedRedisDomains))
                 {
-                    if (dnsEp.Host.EndsWith(host, StringComparison.InvariantCultureIgnoreCase))
-                    {
-                        return true;
-                    }
+                    return true;
                 }
             }
+
+            return false;
+        }
+
+        private bool IsHostInDomains(string hostName, string[] domains)
+        {
+            foreach (var domain in domains)
+            {
+                if (hostName.EndsWith(domain, StringComparison.InvariantCultureIgnoreCase))
+                {
+                    return true;
+                }
+            }
+
             return false;
         }
 
@@ -65,6 +82,10 @@ public override bool GetDefaultSsl(EndPointCollection endPoints)
                         {
                             return true;
                         }
+                        if (dns.Port == 10000 && IsHostInDomains(dns.Host, azureManagedRedisDomains))
+                        {
+                            return true; // SSL is enabled by default on AMR caches
+                        }
                         break;
                     case IPEndPoint ip:
                         if (ip.Port == 6380)

tests/StackExchange.Redis.Tests/ConfigTests.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.IO.Pipelines;
@@ -25,7 +26,6 @@ public class ConfigTests : TestBase
     public ConfigTests(ITestOutputHelper output, SharedConnectionFixture fixture) : base(output, fixture) { }
 
     public Version DefaultVersion = new(3, 0, 0);
-    public Version DefaultAzureVersion = new(6, 0, 0);
 
     [Fact]
     public void ExpectedFields()
@@ -132,12 +132,21 @@ public void SslProtocols_InvalidValue()
         Assert.Throws<ArgumentOutOfRangeException>(() => ConfigurationOptions.Parse("myhost,sslProtocols=InvalidSslProtocol"));
     }
 
-    [Fact]
-    public void ConfigurationOptionsDefaultForAzure()
-    {
-        var options = ConfigurationOptions.Parse("contoso.redis.cache.windows.net");
-        Assert.True(options.DefaultVersion.Equals(DefaultAzureVersion));
+    [Theory]
+    [InlineData("contoso.redis.cache.windows.net:6380", true)]
+    [InlineData("contoso.REDIS.CACHE.chinacloudapi.cn:6380", true)] // added a few upper case chars to validate comparison
+    [InlineData("contoso.redis.cache.usgovcloudapi.net:6380", true)]
+    [InlineData("contoso.redisenterprise.cache.azure.net:10000", false)]
+    [InlineData("contoso.redis.azure.net:10000", true)]
+    [InlineData("contoso.redis.chinacloudapi.cn:10000", true)]
+    [InlineData("contoso.redis.usgovcloudapi.net:10000", true)]
+    public void ConfigurationOptionsDefaultForAzure(string hostAndPort, bool sslShouldBeEnabled)
+    {
+        Version defaultAzureVersion = new(6, 0, 0);
+        var options = ConfigurationOptions.Parse(hostAndPort);
+        Assert.True(options.DefaultVersion.Equals(defaultAzureVersion));
         Assert.False(options.AbortOnConnectFail);
+        Assert.Equal(sslShouldBeEnabled, options.Ssl);
     }
 
     [Fact]
@@ -148,31 +157,6 @@ public void ConfigurationOptionsForAzureWhenSpecified()
         Assert.True(options.AbortOnConnectFail);
     }
 
-    [Fact]
-    public void ConfigurationOptionsDefaultForAzureChina()
-    {
-        // added a few upper case chars to validate comparison
-        var options = ConfigurationOptions.Parse("contoso.REDIS.CACHE.chinacloudapi.cn");
-        Assert.True(options.DefaultVersion.Equals(DefaultAzureVersion));
-        Assert.False(options.AbortOnConnectFail);
-    }
-
-    [Fact]
-    public void ConfigurationOptionsDefaultForAzureGermany()
-    {
-        var options = ConfigurationOptions.Parse("contoso.redis.cache.cloudapi.de");
-        Assert.True(options.DefaultVersion.Equals(DefaultAzureVersion));
-        Assert.False(options.AbortOnConnectFail);
-    }
-
-    [Fact]
-    public void ConfigurationOptionsDefaultForAzureUSGov()
-    {
-        var options = ConfigurationOptions.Parse("contoso.redis.cache.usgovcloudapi.net");
-        Assert.True(options.DefaultVersion.Equals(DefaultAzureVersion));
-        Assert.False(options.AbortOnConnectFail);
-    }
-
     [Fact]
     public void ConfigurationOptionsDefaultForNonAzure()
     {

tests/StackExchange.Redis.Tests/DefaultOptionsTests.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Configuration;
 using System.Linq;
 using System.Net;
 using System.Threading;
@@ -65,6 +66,21 @@ public void IsMatchOnDomain()
         Assert.IsType<DefaultOptionsProvider>(provider);
     }
 
+    [Theory]
+    [InlineData("contoso.redis.cache.windows.net")]
+    [InlineData("contoso.REDIS.CACHE.chinacloudapi.cn")] // added a few upper case chars to validate comparison
+    [InlineData("contoso.redis.cache.usgovcloudapi.net")]
+    [InlineData("contoso.redisenterprise.cache.azure.net")]
+    [InlineData("contoso.redis.azure.net")]
+    [InlineData("contoso.redis.chinacloudapi.cn")]
+    [InlineData("contoso.redis.usgovcloudapi.net")]
+    public void IsMatchOnAzureDomain(string hostName)
+    {
+        var epc = new EndPointCollection(new List<EndPoint>() { new DnsEndPoint(hostName, 0) });
+        var provider = DefaultOptionsProvider.GetProvider(epc);
+        Assert.IsType<AzureOptionsProvider>(provider);
+    }
+
     [Fact]
     public void AllOverridesFromDefaultsProp()
     {