I just did FizzBuzz with AWS Lambda
Backgroud I have more chances to hear about serverless applications using AWS Lambda, so I tried making it.
Preparetion
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Development (lambda only)
import json
def lambda_handler(event, context):
request = "[inner_test]"
num = 30
doc = {
"message":'Hello from Lambda!',
"request":process(num)
}
# TODO implement
return {
'statusCode': 200,
'body': json.dumps(doc)
}
def process(src):
if src % 15 == 0:
return "FizzBuzz"
elif src % 5 == 0:
return "Buzz"
elif src % 3 == 0:
return "Fizz"
else :
return src
After writing, press "Deploy"-> "Test".
Then ...
The execution result is output in the log.
Development (with API Gateway) The previous configuration was only lambda, but here I will make a request from the outside using API Gateway.
First, select API Gateway from the trigger.
Security is your choice.
Select "Stage"-> "POST" to get the URL.
The structure of the URL itself is https: // {restapi_id} .execute-api. {region} .amazonaws.com/ {stage_name} /
So, get the value requested by lambda and FizzBuzz. Speaking in the codebase, it parses event ["body "] with json and gets the input value.
import json
def lambda_handler(event, context):
request = "[inner_test]"
num = 30
#Supports API Gateway
#Get the value of the request here
if "body" in event.keys():
request = json.loads(event["body"])
num = request["num"]
doc = {
"message":'Hello from Lambda!',
"request":process(num)
}
# TODO implement
return {
'statusCode': 200,
'body': json.dumps(doc)
}
def process(src):
if src % 15 == 0:
return "FizzBuzz"
elif src % 5 == 0:
return "Buzz"
elif src % 3 == 0:
return "Fizz"
else :
return src
Try hitting the API using Postman to see if the fizzbuzz value is actually returned.
If you change the value of num, either Fizz``Buzz``FizzBuzz or a number will be returned.
It's done.
Future I thought I should use the minimum VPS and drop the necessary packages without saying serverless, but I could do it in no time. If you link with S3 after lambda processing, it seems that you can leave the data.
Reference Call REST API on Amazon API Gateway
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