1 00:00:00,360 --> 00:00:07,440 In this video, we are going to understand how a HTTP API triggers a lambda, even JSON object. 2 00:00:07,560 --> 00:00:13,050 And after that, we will develop our lambda function with incoming events to perform CRUD operations. 3 00:00:13,350 --> 00:00:16,380 In the last video we have test our API gateway. 4 00:00:16,410 --> 00:00:22,410 With this link you can see in here with this link we test and it is turned back to hello from Lambda, 5 00:00:22,500 --> 00:00:29,940 but this time we will test for all cases to understand incoming event json http API to the lambda function. 6 00:00:29,940 --> 00:00:33,570 We can see that we will get get by ID, post and delete. 7 00:00:33,570 --> 00:00:39,360 So we will collect these even JSON object one HTTP API go to a base lambda. 8 00:00:39,360 --> 00:00:43,990 And according to these events JSON object, we will develop our lambda function in the next videos. 9 00:00:44,010 --> 00:00:45,690 So let's get started. 10 00:00:45,840 --> 00:00:46,260 Okay. 11 00:00:46,260 --> 00:00:53,730 Now I'm going to send a HTTP, get post and delete methods one by one and see incoming events from HTTP 12 00:00:53,730 --> 00:00:55,320 API to a lambda. 13 00:00:55,410 --> 00:00:56,790 So let's get started. 14 00:00:56,790 --> 00:00:59,250 In order to do that, please open the postman. 15 00:00:59,250 --> 00:01:04,470 So we should get the API up from the API gateway. 16 00:01:04,620 --> 00:01:08,910 I'm going to copy from here and come the postman and paste here. 17 00:01:08,940 --> 00:01:11,640 Now this time I'm going to start with basics. 18 00:01:11,640 --> 00:01:15,060 As you can see that we are performing to get product section. 19 00:01:15,060 --> 00:01:22,080 So http get and we provide this product append to the our URL. 20 00:01:22,110 --> 00:01:25,020 Now click the send button and this will be triggered. 21 00:01:25,020 --> 00:01:28,380 The API gateway will turn back the header from lambda. 22 00:01:28,380 --> 00:01:30,480 So I'm going to check lambda. 23 00:01:31,270 --> 00:01:34,250 Walks for that purpose, please go to Lambda functions. 24 00:01:34,270 --> 00:01:35,680 Open the product function. 25 00:01:35,830 --> 00:01:39,040 Go to monitoring v logs in cloud logs. 26 00:01:39,040 --> 00:01:44,110 So now we will see how http api triggered to lambda function. 27 00:01:44,680 --> 00:01:52,570 And here you can see that I'm going to copy this JSON file and go to the Visual Studio code and I'm 28 00:01:52,570 --> 00:02:00,340 going to paste in here, even get JSON example and remove the first part and save this file. 29 00:02:00,340 --> 00:02:07,300 So as you can see that we sent get product and these get product exactly seems in the road K of the 30 00:02:07,330 --> 00:02:13,540 event JSON file which is selected from the API gateway and you can see also raw pet in here. 31 00:02:13,540 --> 00:02:16,240 So basically these are the important parameters. 32 00:02:16,240 --> 00:02:20,800 According to these parameters, we can identify incoming growth and HTTP method. 33 00:02:21,100 --> 00:02:24,250 So now let me send another request. 34 00:02:24,250 --> 00:02:26,260 We save these get method. 35 00:02:26,290 --> 00:02:29,230 Now I will continue with our example. 36 00:02:29,230 --> 00:02:34,990 You can see in here this time I'm going to send get product by ID request for that purpose. 37 00:02:34,990 --> 00:02:44,560 Let's open the postman and create a any request and copy the payload you are in here paste in here. 38 00:02:44,560 --> 00:02:52,030 This will be the http get but this time I'm going to add some appending the product ID for example we 39 00:02:52,030 --> 00:02:58,630 can add slash for and also I can add some queries things for example, category. 40 00:03:00,210 --> 00:03:01,500 A cool phone. 41 00:03:03,430 --> 00:03:08,950 So this is some advance get requests that including the product ID and query string. 42 00:03:08,950 --> 00:03:13,660 So lets click the send button and this will be returned back to us. 43 00:03:14,080 --> 00:03:19,450 The same message because this again the integrated lambda function and return back to the message. 44 00:03:19,450 --> 00:03:26,560 But this time we will understand how these events and object trigger to a lambda again for that purpose 45 00:03:26,560 --> 00:03:28,000 go to colored watch looks. 46 00:03:29,260 --> 00:03:30,250 Come here. 47 00:03:30,280 --> 00:03:36,280 Open the latest log stream for our product function and go to latest look. 48 00:03:36,370 --> 00:03:44,230 And if you copy this look and if you go to the we use the code this time I have created get by ID. 49 00:03:45,170 --> 00:03:48,950 Or to beginning and remove the first line and save this file. 50 00:03:49,100 --> 00:03:57,200 So as you can see that we have created get product by ID and we have important values that we can catch 51 00:03:57,200 --> 00:03:58,940 these into our lambda function. 52 00:03:58,940 --> 00:04:03,080 For example, see the rock and roll pet in this time. 53 00:04:03,080 --> 00:04:08,690 This is the get product by ID and raw pet is products like for the exact ID information. 54 00:04:08,870 --> 00:04:13,700 And also you can see that we have real quick listing parameters. 55 00:04:13,700 --> 00:04:18,380 If you scroll down, we have created parameters which is the category form. 56 00:04:18,560 --> 00:04:24,950 And if you scroll down we can see that we have pet parameters, the ID equals four. 57 00:04:25,040 --> 00:04:30,260 So these are the important attributes that we are going to use when developing our lambda function. 58 00:04:30,260 --> 00:04:34,640 So that's why I'm saving these incoming JSON objects from the HTTP API. 59 00:04:34,700 --> 00:04:35,960 So very good. 60 00:04:35,960 --> 00:04:40,840 So let's continue to collect our HTTP APIs. 61 00:04:40,910 --> 00:04:44,930 So this time I'm going to post product with the new product payload. 62 00:04:44,930 --> 00:04:48,680 For that purpose, open the postman and create a new request. 63 00:04:48,740 --> 00:04:53,750 And in this request I'm going to copy this request and paste in here. 64 00:04:53,780 --> 00:04:58,280 This is very similar we to get, but we should change the method as a post. 65 00:04:58,400 --> 00:05:01,970 So when we change the post we should provide the payload. 66 00:05:01,970 --> 00:05:08,060 Also, in order to do that, please click the Body Select Row and click the JSON. 67 00:05:08,060 --> 00:05:13,820 And in here I'm going to provide a JSON object about the product. 68 00:05:13,820 --> 00:05:16,250 Product Jason has name and price. 69 00:05:16,280 --> 00:05:18,830 Think about that is the product item in Dynamo. 70 00:05:18,830 --> 00:05:19,340 DB. 71 00:05:19,340 --> 00:05:27,020 So now we are going to send the post request to this URL, this slash product and providing these JSON 72 00:05:27,020 --> 00:05:30,500 object as a payload body of this exit postal version. 73 00:05:30,500 --> 00:05:37,070 Just click the send button and see that again the lambda function return back the hello message. 74 00:05:37,070 --> 00:05:41,960 So the idea is that we should collect the event JSON object for that purpose. 75 00:05:41,960 --> 00:05:45,380 Open the cloud box for the product function. 76 00:05:45,410 --> 00:05:49,190 Come to latest log stream and come here. 77 00:05:49,280 --> 00:05:58,610 So copy this log open or we just do a code and come here, paste the event post JSON file. 78 00:05:59,770 --> 00:06:02,050 Remove the first line and save this file. 79 00:06:02,140 --> 00:06:05,170 Okay, let's examine this Jason file also. 80 00:06:05,200 --> 00:06:07,960 So these are the important attributes that we solve. 81 00:06:07,960 --> 00:06:12,250 That root key is post product and raw pet is product. 82 00:06:12,310 --> 00:06:19,690 And if you scroll down, we can see that we will see the incoming information under the event. 83 00:06:19,930 --> 00:06:25,440 But the information, the name is Price, also including this JSON object. 84 00:06:25,450 --> 00:06:28,210 We will pass this JSON into our lambda function. 85 00:06:28,210 --> 00:06:33,430 So if there is a post request, we should pass by the information in order to get payload and insert 86 00:06:33,430 --> 00:06:34,360 product record. 87 00:06:34,720 --> 00:06:42,670 As you can see that we have understood that how http api triggered to lambda function with JS object 88 00:06:42,670 --> 00:06:46,570 and we save this event JSON object into our visual project. 89 00:06:46,750 --> 00:06:50,260 Now it is time to develop our lambda function with these payloads.