AWS SDK V3: Migrate CreateFunction to v3 (#757)

GH-641

This is still an experimental migration.
First, only CreateFunction will be migrated.
We also plan to maintain unit tests.

Author: abetomo

lib/main.js

@@ -19,6 +19,10 @@ const CloudWatchLogs = require(path.join(__dirname, 'cloudwatch_logs'))
 const AWSXRay = require('aws-xray-sdk-core')
 const { createNamespace } = require('continuation-local-storage')
 
+// Migrating to v3.
+const { LambdaClient, CreateFunctionCommand } = require('@aws-sdk/client-lambda')
+const lambdaClient = new LambdaClient()
+
 const maxBufferSize = 50 * 1024 * 1024
 
 class Lambda {
@@ -236,8 +240,8 @@ Emulate only the body of the API Gateway event.
       Role: program.role,
       Runtime: program.runtime,
       Description: program.description,
-      MemorySize: program.memorySize,
-      Timeout: program.timeout,
+      MemorySize: Number(program.memorySize),
+      Timeout: Number(program.timeout),
       Architectures: program.architecture ? [program.architecture] : ['x86_64'],
       Publish: (() => {
         if (typeof program.publish === 'boolean') {
@@ -688,6 +692,13 @@ Emulate only the body of the API Gateway event.
   }
 
   _uploadNew (lambda, params) {
+    if (process.env.USE_AWS_SDK_V3) {
+      // todo retry
+      console.log('DEBUG: Use AWS SDK V3: CreateFunctionCommand()')
+      const command = new CreateFunctionCommand(params)
+      return lambdaClient.send(command)
+    }
+
     return new Promise((resolve, reject) => {
       const request = lambda.createFunction(params, (err, data) => {
         if (err) return reject(err)