[Internal] DocumentClient: Adds TryGetAccountProperties (#4167)

* add api

* tests

* Update test

* Rename

Author: ealsur

Microsoft.Azure.Cosmos/src/DocumentClient.cs

@@ -1235,6 +1235,23 @@ public virtual Documents.ConsistencyLevel ConsistencyLevel
             }
         }
 
+        /// <summary>
+        /// Returns the account properties available in the service configuration if the client was initialized.
+        /// </summary>
+        public bool TryGetCachedAccountProperties(out AccountProperties properties)
+        {
+            if (this.isSuccessfullyInitialized
+                && this.accountServiceConfiguration != null
+                && this.accountServiceConfiguration.AccountProperties != null)
+            {
+                properties = this.accountServiceConfiguration.AccountProperties;
+                return true;
+            }
+
+            properties = null;
+            return false;
+        }
+
         /// <summary>
         /// Disposes the client for the Azure Cosmos DB service.
         /// </summary>

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/ClientTests.cs

@@ -290,6 +290,24 @@ public async Task ValidateAzureKeyCredentialDirectModeUpdateAsync()
             }
         }
 
+        [TestMethod]
+        public async Task ValidateTryGetAccountProperties()
+        {
+            using CosmosClient cosmosClient = new CosmosClient(
+                ConfigurationManager.AppSettings["GatewayEndpoint"],
+                ConfigurationManager.AppSettings["MasterKey"]
+            );
+
+            Assert.IsFalse(cosmosClient.DocumentClient.TryGetCachedAccountProperties(out AccountProperties propertiesFromMethod));
+
+            AccountProperties accountProperties = await cosmosClient.ReadAccountAsync();
+
+            Assert.IsTrue(cosmosClient.DocumentClient.TryGetCachedAccountProperties(out propertiesFromMethod));
+
+            Assert.AreEqual(accountProperties.Consistency.DefaultConsistencyLevel, propertiesFromMethod.Consistency.DefaultConsistencyLevel);
+            Assert.AreEqual(accountProperties.Id, propertiesFromMethod.Id);
+        }
+
         private int TaskStartedCount = 0;
 
         private async Task<Exception> ReadNotFound(Container container)

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.Tests/InterfaceParityTest.cs

@@ -24,6 +24,7 @@ public void TestAllPublicMethodsExistInIDocumentClient()
             string[] excludedMethods = new string[]
             {
                 "OpenAsync", // exposed public methods.
+                "TryGetCachedAccountProperties", // currently only internal
                 "get_PartitionResolvers", "get_ResourceTokens", // Obsolete getters.
                 "ToString", "Equals", "GetHashCode", "GetType", "get_httpClient"
             };