1 00:00:00,300 --> 00:00:07,260 In this video we are going to develop lambda function for incoming HTTP API, even JSON object to perform 2 00:00:07,260 --> 00:00:08,280 CRUD operations. 3 00:00:08,280 --> 00:00:09,540 So let's get started. 4 00:00:09,540 --> 00:00:16,170 We are in this stage, we get this all events JSON from incoming different HTTP methods and now we will 5 00:00:16,170 --> 00:00:21,900 develop these lambda function according to incoming event JSON files to perform CRUD operations. 6 00:00:22,050 --> 00:00:24,840 So to do that, please open the widgets to your code. 7 00:00:24,840 --> 00:00:32,040 And in here, as you can see that we have you won't get even get by ID and event post requests so we 8 00:00:32,040 --> 00:00:37,470 will collect all these incoming event JSON objects that we are going to develop our lambda function. 9 00:00:37,470 --> 00:00:43,620 Now to develop our lambda function, I have created the index space under the lecture folder. 10 00:00:43,620 --> 00:00:47,730 So we basically implement this method in here. 11 00:00:47,850 --> 00:00:50,190 As you can see that this is the dummy method. 12 00:00:50,190 --> 00:00:53,760 Didn't implement any business logic now, but you are. 13 00:00:54,030 --> 00:00:59,910 I would like to explain that this is the method body and in the first line of code we always log the 14 00:00:59,910 --> 00:01:02,040 incoming event to see from the Amazon cloud. 15 00:01:02,190 --> 00:01:05,340 Look, after that I have created a try case below. 16 00:01:05,430 --> 00:01:08,290 So this is also best practice to use this case. 17 00:01:08,370 --> 00:01:16,080 BLOCK When you integrate with the API gateway related services, so basically we will create a body 18 00:01:16,110 --> 00:01:22,440 definition in here and we have created try case look in the trial look, we will implement the actual 19 00:01:22,440 --> 00:01:23,910 business code in here. 20 00:01:23,940 --> 00:01:30,870 And after that we will lock the body and after that we have to return a 200 such code if everything 21 00:01:30,870 --> 00:01:37,050 goes well and the body information and the details should be sent in this line of code. 22 00:01:37,050 --> 00:01:39,180 So this is important to send. 23 00:01:39,210 --> 00:01:44,430 So this code and the body information to response back the client application for the API gateway integrations 24 00:01:44,430 --> 00:01:48,650 with the lambda and if there is any error into this to do. 25 00:01:48,680 --> 00:01:50,040 BLOCK We have a case. 26 00:01:50,040 --> 00:01:50,820 BLOCK In the case. 27 00:01:50,820 --> 00:01:57,900 BLOCK We basically log the error and after that the term back to source code 400 and give the body information 28 00:01:57,900 --> 00:01:59,940 with the message and the error details. 29 00:01:59,940 --> 00:02:07,320 So this is the best practice to make structure your lambda functions according to this three page block. 30 00:02:07,320 --> 00:02:13,410 Now I'm going to intimate this to do part, so let's implement this lambda function. 31 00:02:13,410 --> 00:02:16,560 Basically, we will accommodate the incoming events. 32 00:02:16,560 --> 00:02:19,530 So which events comes to this lambda function? 33 00:02:19,830 --> 00:02:26,580 We will see these events from the event JSON object, for example, the basic get product method comes 34 00:02:26,580 --> 00:02:31,650 with the rock and roll pet and we will look at the rock, right? 35 00:02:31,650 --> 00:02:38,850 So if you look at the get by ID again, we need to get the rock and roll pet to get the rock to understand 36 00:02:38,850 --> 00:02:41,970 the exact URL is matching or not. 37 00:02:42,000 --> 00:02:49,470 After that, if there is additional properties like ID pet parameters, we will check the pet parameters. 38 00:02:49,470 --> 00:02:56,340 And also if you look at the what is then a post request, we will see the body information. 39 00:02:56,340 --> 00:03:03,210 So that means Rod Key is important key attribute to develop our lambda function. 40 00:03:03,210 --> 00:03:06,660 For that purpose, I'm going to write the switch statement. 41 00:03:07,320 --> 00:03:09,840 So the key value for us event. 42 00:03:10,570 --> 00:03:11,230 But. 43 00:03:12,730 --> 00:03:13,180 Key. 44 00:03:13,760 --> 00:03:15,460 So we will check the road key. 45 00:03:15,470 --> 00:03:16,250 So. 46 00:03:17,650 --> 00:03:19,060 If the real key is. 47 00:03:20,220 --> 00:03:21,540 Get product. 48 00:03:24,240 --> 00:03:26,620 Actually, it is good to copy from me in here. 49 00:03:26,640 --> 00:03:28,910 We will check the dot k and E throughout k. 50 00:03:28,920 --> 00:03:32,070 Exact same text with the get product. 51 00:03:32,070 --> 00:03:33,980 So we will implement the get product. 52 00:03:33,990 --> 00:03:41,220 So I'm going to basically set the body information with predefined text for the processing to get all 53 00:03:41,220 --> 00:03:46,560 products, not to integrate dynamic DB for now to implement all these case blocks. 54 00:03:46,560 --> 00:03:52,290 So basically this is the first case and I would like to continue the another case blocks. 55 00:03:52,290 --> 00:03:52,950 Right. 56 00:03:54,680 --> 00:03:57,590 So the second case look is get by ID. 57 00:03:57,620 --> 00:03:59,660 I'm going to copy from here. 58 00:04:00,560 --> 00:04:02,750 And come to court. 59 00:04:02,780 --> 00:04:09,950 So if the key is product ID this time, I have to check the parameters. 60 00:04:09,950 --> 00:04:10,610 Right. 61 00:04:10,610 --> 00:04:16,640 So because Gateway ID is required to get ID information from the PED parameters. 62 00:04:16,640 --> 00:04:22,730 So that's why I have to put one more F in here if you want that. 63 00:04:23,770 --> 00:04:25,270 Pet parameters is not. 64 00:04:25,270 --> 00:04:25,750 Not. 65 00:04:27,310 --> 00:04:29,260 I'm going to copy paste in here. 66 00:04:31,110 --> 00:04:38,160 You can see that you will check the parameters and get the parameters info from these attributes for 67 00:04:38,160 --> 00:04:38,710 that purpose. 68 00:04:38,730 --> 00:04:44,400 I also get this line of code and remove this body. 69 00:04:45,120 --> 00:04:45,750 Okay. 70 00:04:45,780 --> 00:04:47,670 If you look at this line of code. 71 00:04:49,590 --> 00:04:51,270 Let me make it more clear. 72 00:04:52,320 --> 00:04:57,700 This is basically implement to accommodate the incoming demand with get by ID of product. 73 00:04:57,720 --> 00:04:59,590 We will check the road. 74 00:04:59,610 --> 00:04:59,880 Okay. 75 00:04:59,910 --> 00:05:02,520 And after that we will check the is there an iPad parameters? 76 00:05:02,520 --> 00:05:07,980 If there is a parameters, we will implement the actual logic with the ID information. 77 00:05:07,980 --> 00:05:13,950 For now, I'm going to write down the body information with getting event pad parameters that ID volume. 78 00:05:13,980 --> 00:05:20,160 So this part is accommodate the request of the gate product slice one, two, three, four OC. 79 00:05:20,160 --> 00:05:26,400 So now is the same way I'm going to continue with the post and delete operation for that purpose. 80 00:05:27,090 --> 00:05:29,160 Let me remove this line of code. 81 00:05:30,180 --> 00:05:31,440 I'm -- in here. 82 00:05:32,420 --> 00:05:34,520 Yes, you can find that. 83 00:05:41,560 --> 00:05:44,100 You will have switch statement in this way. 84 00:05:44,110 --> 00:05:49,990 So basically after the product and product buy ID, we have implemented the post product. 85 00:05:50,020 --> 00:05:55,690 In this case, if there is a post product, that means we have to get the body information and pass 86 00:05:55,690 --> 00:05:57,920 this body information for that purpose. 87 00:05:57,940 --> 00:06:03,910 We are getting the payload with JSON, that pass method, getting the event body information after we 88 00:06:03,910 --> 00:06:04,810 get the payload. 89 00:06:04,840 --> 00:06:08,190 We basically implement the insert operation to the Dynamo DB. 90 00:06:08,200 --> 00:06:15,490 But now I'm going to use set the text message for the payload to see implement post product. 91 00:06:15,670 --> 00:06:19,090 And the last item is the delete by product. 92 00:06:19,300 --> 00:06:25,690 So it's the same way when I get product ID this time we will delete product by ID. 93 00:06:26,530 --> 00:06:31,450 For that purpose, we will check the parameters and get the parameters into our text message. 94 00:06:31,480 --> 00:06:33,850 You can see these comments in here. 95 00:06:33,850 --> 00:06:39,570 We accommodate the HTTP delete post, get buy ID and get product in this line of code. 96 00:06:39,580 --> 00:06:45,310 So this is the our latest version of the switch statement and we can remove please make sure that your 97 00:06:45,310 --> 00:06:48,000 code also identical with this switch block. 98 00:06:48,040 --> 00:06:53,530 After the switch, look, we basically log the body information and turn back the body information, 99 00:06:53,530 --> 00:06:55,840 which is also code is 200. 100 00:06:55,840 --> 00:06:59,380 And if there is any problem in our business logic, we have a catch. 101 00:06:59,380 --> 00:07:04,180 BLOCK It is turning to 400 and the message error details. 102 00:07:04,210 --> 00:07:06,640 Of course, we will log the error message also. 103 00:07:06,640 --> 00:07:11,020 So this is the latest implementation of our Lambda function. 104 00:07:11,020 --> 00:07:19,300 Basically, we handle all incoming requests from the HTTP API by looking the event that Rod K and according 105 00:07:19,300 --> 00:07:23,770 to the key attributes, we will implement our get post and delete operations. 106 00:07:23,950 --> 00:07:26,140 After that we will perform CRUD operations. 107 00:07:26,140 --> 00:07:31,150 But in order to make simple, I am not calling any database communications for now. 108 00:07:31,180 --> 00:07:36,780 Instead of that, I have set the body information with the required parameter and attribute value. 109 00:07:36,790 --> 00:07:42,670 But of course we will implement and communicate dynamic DB in the upcoming videos with the latest hands 110 00:07:42,670 --> 00:07:43,040 on loop. 111 00:07:43,180 --> 00:07:46,540 But for this example, it is good to stay live as it is. 112 00:07:46,540 --> 00:07:50,010 So now I'm going to deploy this function for that purpose. 113 00:07:50,020 --> 00:07:51,580 Let's copy all. 114 00:07:52,880 --> 00:07:54,330 Copy all quotes. 115 00:07:56,240 --> 00:08:00,860 So after that, go to the lambda function, product function. 116 00:08:01,980 --> 00:08:04,380 And come to the cold part. 117 00:08:05,510 --> 00:08:07,100 Remove and paste in here. 118 00:08:07,310 --> 00:08:10,340 So deploy or code. 119 00:08:11,280 --> 00:08:17,850 As you can see that we have successfully developed our lambda function that can handle all income requests 120 00:08:17,850 --> 00:08:20,310 from the API Gateway HTTP API. 121 00:08:20,340 --> 00:08:24,450 In the next video, we will test our internet operations.