GODRIVER-2368 Add example for AWS Lambda handler. (#1096)

Add example for AWS Lambda handler.

Author: qingyang-hu

examples/_example_aws_lambda_handler.go

@@ -0,0 +1,33 @@
+// Copyright (C) MongoDB, Inc. 2022-present.
+//
+// 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
+
+package examples
+
+import (
+	"context"
+	"os"
+
+	runtime "github.com/aws/aws-lambda-go/lambda"
+	"go.mongodb.org/mongo-driver/mongo"
+	"go.mongodb.org/mongo-driver/mongo/options"
+)
+
+// Start AWS Lambda Example 1
+
+var client, err = mongo.Connect(context.TODO(), options.Client().ApplyURI(os.Getenv("MONGODB_URI")))
+
+func HandleRequest(ctx context.Context) error {
+	if err != nil {
+		return err
+	}
+	return client.Ping(context.TODO(), nil)
+}
+
+// End AWS Lambda Example 1
+
+func main() {
+	runtime.Start(HandleRequest)
+}