Its always good to take the simple route, Lambda functions can be invoked via an API gateway but setting up the API invocation can be created using two main methods:
- Create an API gateway from scratch and make your own permissions.
- Designate a lambda source as an API gateway through lambda and allow lambda to handle the permissions
Creating it from scratch I kept getting error:
{
message: "Not Found"
}
Or
{
message: "Internal Server Error"
}I tend to obsess over things like this because I feel like if I took the easy way out I wouldn’t understand why I am getting this error. After digging for a bit of time I realized that my permissions for the easy method were:
},
"Action": "lambda:InvokeFunction",
"Resource": "arn:aws:lambda:us-east-1:*********:function:WebsiteHitCounterDynamoDBupdate",
"Condition": {
"ArnLike": {
"AWS:SourceArn": "arn:aws:execute-api:us-east-1:*********:*******/*/*/WebsiteHitCounterDynamoDBupdate"
}After editing this statement to protect my account, you can see that my lambda function could ONLY be invoked by the API, however when testing my API I was only invoking the API but not directing my request directly to the lambda function thus the improper URL
https://*******.execute-api.us-east-1.amazonaws.com/Version1Needed to be edited to add the name of the function I wanted to invoke:
https://*******.execute-api.us-east-1.amazonaws.com/Version1/WebsiteHitCounterDynamoDBupdateI didn’t like seeing a Null response so I added JSON to my deployment package and now it responds with
{
message: "Update of WebCounter for Alkisnar.IO Completed successfully!"
}Doing further research I also realized that when making API gateways from scratch you need to insure that the $default route was deployed and my invocation needed to be listed as a child below.
When a client sends an API request, API Gateway first determines which stage to route the request to. If the request explicitly matches a stage, API Gateway sends the request to that stage. If no stage fully matches the request, API Gateway sends the request to the
https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-routes.html$defaultstage. If there’s no$defaultstage, then the API returns{"message":"Not Found"}.