1 00:00:00,390 --> 00:00:06,390 In this video, we are going to develop a lambda function handle in Node.js. 2 00:00:07,060 --> 00:00:09,300 So we are in the second step. 3 00:00:09,310 --> 00:00:13,870 We have created execution role and now we are going to create a function code that will function code. 4 00:00:14,350 --> 00:00:15,470 Okay, let's get started. 5 00:00:15,490 --> 00:00:18,340 Please open the visual code and create a new lecture. 6 00:00:18,760 --> 00:00:24,610 And as you can see that before we creating this any section, we have created a separate lecture. 7 00:00:24,910 --> 00:00:31,420 Now we will use Node.js runtime for our lambda functions and it is required to 100 method that we will 8 00:00:31,420 --> 00:00:32,800 develop in this video. 9 00:00:32,890 --> 00:00:38,860 The lambda function handler is the method in our function code that processed the events incoming events. 10 00:00:38,860 --> 00:00:42,340 When our function is invoked, Lambda runs the handler method. 11 00:00:42,520 --> 00:00:48,670 So when the handler exits or returns a response, it becomes available to handle another event. 12 00:00:48,670 --> 00:00:52,990 So this is the basic execution principle for the lambda functions. 13 00:00:52,990 --> 00:00:56,770 For that purpose, I'm going to create a new file which is the index. 14 00:00:57,040 --> 00:01:01,600 JS This will be include our Lambda Handler code. 15 00:01:01,600 --> 00:01:05,470 So in these index JS we will develop basic Lambda Code. 16 00:01:05,500 --> 00:01:09,130 I'm going to developing our basic lambda code. 17 00:01:09,130 --> 00:01:17,140 You can see in here I have copy and paste for the export standard by this method name we are exporting 18 00:01:17,140 --> 00:01:23,890 the handle method and this will be getting event parameter for the incoming event and we basically lock 19 00:01:23,890 --> 00:01:27,160 these incoming events and after that we will return the response. 20 00:01:27,400 --> 00:01:28,690 Hello from Lambda. 21 00:01:29,500 --> 00:01:36,010 Okay, so this is the basic lambda code that looks to incoming event and return success response with 22 00:01:36,010 --> 00:01:37,000 the hello message. 23 00:01:37,120 --> 00:01:43,300 Basically this example function log the contents and log the event, incoming event object and return 24 00:01:43,300 --> 00:01:47,020 back to the this string response as a body. 25 00:01:47,290 --> 00:01:50,430 And in our case our finding is indexed. 26 00:01:50,620 --> 00:01:54,250 JS And our method name is the 100 method. 27 00:01:54,250 --> 00:01:56,410 So this is the export standard. 28 00:01:56,410 --> 00:02:00,940 So the default values is this name in the console. 29 00:02:00,940 --> 00:02:04,210 Also we can see this index file and 100 method. 30 00:02:05,210 --> 00:02:09,050 So basically the runtime passes three arguments to the 100 method. 31 00:02:09,080 --> 00:02:15,900 The first parameters is event and event object, which contains the information from the invoker and 32 00:02:15,900 --> 00:02:16,820 the IMO capacities. 33 00:02:16,820 --> 00:02:23,990 Information is adjacent format string one invoke this function and the runtime is converts to this object. 34 00:02:24,200 --> 00:02:27,110 One Natively service is invoked our function. 35 00:02:27,110 --> 00:02:29,750 The event structure varies by the invoke or services. 36 00:02:29,750 --> 00:02:36,350 For example, this event object will be differentiate when it invokes from the Amazon S3 or API gateway. 37 00:02:36,380 --> 00:02:40,430 We will see these different events in Lambda function in the upcoming sections. 38 00:02:40,430 --> 00:02:47,390 But basically in this video we have developed our Lambda function code with the default code window 39 00:02:47,420 --> 00:02:53,900 and also you can check the default method from the our last created lambda function. 40 00:02:53,900 --> 00:02:59,870 If you open the my function and contact window, you can see that this is the default hundred method 41 00:02:59,870 --> 00:03:02,810 which is generated from the ADA is lambda. 42 00:03:02,810 --> 00:03:08,600 So we have using the same template for our newly created lambda function.