API GateWay and Lambda

flowchart LR; subgraph protected A[API GateWay]-->B[Lambda] end C[API Key]-->protected
  1. Create Lambda. Test by, 
    2. 
## event.json
{
    "queryStringParameters": {
      "transactionId": "value1",
      "type": "value2",
      "amount": "value3"
    }
  }  
##
aws-vault exec leo.leung -- aws lambda invoke --region=eu-west-2 --function-name=func2 response.json --payload file://event.json   
## it should respond with response.json
{"statusCode": 200, 
    "headers": {"Content-Type": "application/json"}, 
    "body": "{\"transactionId\": 
        \"value1\", \"type\": \"value2\", 
        \"amount\": \"value3\", 
        \"message\": \"Hello from Lambda land\"}"}% 
##
  2. Create API Gateway.
  3. Configure Gateway, like add resource, add method, deploy.
  4. Test by Postman, or browser. https://xxxxxx.execute-api.eu-west-2.amazonaws.com/v1/predict?transactionId=1234&type=buy&amount=300
  5. Configure Gateway, method execution → api key required → api keys → Usage Plans.
  6. Test by Postman by including header x-api-key.

References

  1. API Authentication via API Keys | AWS API Gateway
  2. AWS API Gateway to Lambda Tutorial in Python | Build a REST API
  3. Invoke Lambda Functions with AWS CLI - Complete Guide