CSHARP-4127: Language specific examples for AWS Lambda. (#779)

Author: DmitryLukyanov

Diff for: tests/MongoDB.Driver.Examples/AwsLambda/AwsLambdaExamples.cs

@@ -0,0 +1,91 @@
+/* Copyright 2010-present MongoDB Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#if NETCOREAPP3_1_OR_GREATER
+using Amazon.Lambda.Core;
+using MongoDB.Bson;
+using MongoDB.Driver;
+using System;
+
+// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
+[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]
+
+namespace LambdaTest
+{
+    public class ShareMongoClientLambdaHandler
+    {
+        // Start AWS Lambda Example 1
+        private static MongoClient MongoClient { get; set; }
+        private static MongoClient CreateMongoClient()
+        {
+            var mongoClientSettings = MongoClientSettings.FromConnectionString($"<MONGODB_URI>");
+            mongoClientSettings.ServerApi = new ServerApi(ServerApiVersion.V1, strict: true);
+            return new MongoClient(mongoClientSettings);
+        }
+
+        static ShareMongoClientLambdaHandler()
+        {
+            MongoClient = CreateMongoClient();
+        }
+
+        public string HandleRequest(ILambdaContext context)
+        {
+            var database = MongoClient.GetDatabase("db");
+            var collection = database.GetCollection<BsonDocument>("coll");
+            var result = collection.Find(FilterDefinition<BsonDocument>.Empty).First();
+            return result.ToString();
+        }
+        // End AWS Lambda Example 1
+    }
+
+    public class ConnectUsingAwsIamAuthenticatorLambdaHandler
+    {
+        private static MongoClient MongoClient { get; set; }
+        private static MongoClient CreateMongoClient()
+        {
+            // Start AWS Lambda Example 2
+            string username = Environment.GetEnvironmentVariable("AWS_ACCESS_KEY_ID");
+            string password = Environment.GetEnvironmentVariable("AWS_SECRET_ACCESS_KEY");
+            string awsSessionToken = Environment.GetEnvironmentVariable("AWS_SESSION_TOKEN");
+
+            var awsCredentials =
+                new MongoCredential("MONGODB-AWS", new MongoExternalIdentity(username), new PasswordEvidence(password))
+                .WithMechanismProperty("AWS_SESSION_TOKEN", awsSessionToken);
+
+            var mongoUrl = MongoUrl.Create($"<MONGODB_URI>");
+
+            var mongoClientSettings = MongoClientSettings.FromUrl(mongoUrl);
+            mongoClientSettings.Credential = awsCredentials;
+            mongoClientSettings.ServerApi = new ServerApi(ServerApiVersion.V1, strict: true);
+
+            return new MongoClient(mongoClientSettings);
+            // End AWS Lambda Example 2
+        }
+
+        static ConnectUsingAwsIamAuthenticatorLambdaHandler()
+        {
+            MongoClient = CreateMongoClient();
+        }
+
+        public string HandleRequest(ILambdaContext context)
+        {
+            var database = MongoClient.GetDatabase("db");
+            var collection = database.GetCollection<BsonDocument>("coll");
+            var result = collection.Find(FilterDefinition<BsonDocument>.Empty).First();
+            return result.ToString();
+        }
+    }
+}
+#endif

Diff for: tests/MongoDB.Driver.Examples/MongoDB.Driver.Examples.csproj

@@ -42,6 +42,11 @@
     <PackageReference Include="JunitXml.TestLogger" Version="2.1.81" />
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
+    <PackageReference Include="Amazon.Lambda.Core" Version="2.1.0" />
+    <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.2.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\..\src\MongoDB.Bson\MongoDB.Bson.csproj" />
     <ProjectReference Include="..\..\src\MongoDB.Driver\MongoDB.Driver.csproj" />