Serverless - Passing input through API Gateway to your Lambda Functions by Raj Gupta

we create a GET method on a resource specified by a sequence of path parameters to call the backend Lambda function. The path parameter values specify the input data to the Lambda function


[root@ip-172-31-82-149 ~]# ls amazing-api anaconda-ks.cfg original-ks.cfg [root@ip-172-31-82-149 ~]# cd amazing-api/ [root@ip-172-31-82-149 amazing-api]# ls handler.py serverless.yml [root@ip-172-31-82-149 amazing-api]# export AWS_ACCESS_KEY_ID=AKIAWSYHFCM3Y6ZLJWN6 [root@ip-172-31-82-149 amazing-api]# export AWS_SECRET_ACCESS_KEY=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 [root@ip-172-31-82-149 amazing-api]# serverless deploy Serverless: Packaging service... Serverless: Excluding development dependencies... Serverless: Creating Stack... Serverless: Checking Stack create progress... ..... Serverless: Stack create finished... Serverless: Uploading CloudFormation file to S3... Serverless: Uploading artifacts... Serverless: Uploading service amazing-api.zip file to S3 (314 B)... Serverless: Validating template... Serverless: Updating Stack... Serverless: Checking Stack update progress... ............................... Serverless: Stack update finished... Service Information service: amazing-api stage: dev region: us-east-1 stack: amazing-api-dev resources: 10 api keys: None endpoints: GET - https://da3w2i5gj0.execute-api.us-east-1.amazonaws.com/dev/results functions: hello: amazing-api-dev-hello layers: None Serverless: Run the "serverless" command to setup monitoring, troubleshooting and testing. [root@ip-172-31-82-149 amazing-api]#

[root@ip-172-31-82-149 amazing-api]# vi handler.py [root@ip-172-31-82-149 amazing-api]# cat handler.py import json def hello(event, context): if event['httpMethod']=='GET' and event['queryStringParameters']['query']: body = { "message": 'Your Query is' +event['queryStringParameters']['query'] } response = { "statusCode": 200, "body": json.dumps(body) } return response [root@ip-172-31-82-149 amazing-api]#serverless deploy

https://da3w2i5gj0.execute-api.us-east-1.amazonaws.com/dev/results?query=india

Enter this in URL query=india

Now to use post method do the below changes

[root@ip-172-31-82-149 amazing-api]# vi serverless.yml

functions: hello: handler: handler.hello events: - http: path: results method: get - http: path: query method: post

[root@ip-172-31-82-149 amazing-api]# vi handler.py

[root@ip-172-31-82-149 amazing-api]# cat handler.py

import json

def hello(event, context):

    if event['httpMethod']=='GET' and event['queryStringParameters']['query']:

    body = {

        "message": 'Your Query is' +event['queryStringParameters']['query']

    }

    response = {

        "statusCode": 200,

        "body": json.dumps(body)

    }

    if event['httpMethod']=='POST' and event['body']:

    body = {

        "message": 'received your body text', 'msgBody':event['body']

    }

    response = {

        "statusCode": 200,

        "body": json.dumps(body)

    }

    return response

[root@ip-172-31-82-149 amazing-api]#serverless deploy

curl -d '{"Country":"India"} -H "Content-Type: application/json" -x POST https://da3w2i5gj0.execute-api.us-east-1.amazonaws.com/dev/query