Classes
07 - Lambda Functions
Part 1

API Gateway

API

We will add an API service. Thus, every time there is a call to the API endpoint, whether through the browser or an application, the Lambda function will be triggered.

This will be the schematic drawing:

Create API

Question 1

import boto3
import os
from dotenv import load_dotenv
import random
import string


load_dotenv()

lambda_function_name = "" # Example: sayHello_<INSPER_USERNAME>
api_gateway_name = "" # Example: api_hello_<INSPER_USERNAME>"

id_num = "".join(random.choices(string.digits, k=7))

api_gateway = boto3.client(
    "apigatewayv2",
    aws_access_key_id=os.getenv("AWS_ACCESS_KEY_ID"),
    aws_secret_access_key=os.getenv("AWS_SECRET_ACCESS_KEY"),
    region_name=os.getenv("AWS_REGION"),
)

lambda_function = boto3.client(
    "lambda",
    aws_access_key_id=os.getenv("AWS_ACCESS_KEY_ID"),
    aws_secret_access_key=os.getenv("AWS_SECRET_ACCESS_KEY"),
    region_name=os.getenv("AWS_REGION"),
)

lambda_function_get = lambda_function.get_function(FunctionName=lambda_function_name)

print(lambda_function_get)

api_gateway_create = api_gateway.create_api(
    Name=api_gateway_name,
    ProtocolType="HTTP",
    Version="1.0",
    RouteKey="ANY /", # Here you can change to GET POST and provide route like "GET /hello"
    Target=lambda_function_get["Configuration"]["FunctionArn"],
)

api_gateway_permissions = lambda_function.add_permission(
    FunctionName=lambda_function_name,
    StatementId="api-gateway-permission-statement-" + id_num,
    Action="lambda:InvokeFunction",
    Principal="apigateway.amazonaws.com",
)

print("API Endpoint:", api_gateway_create["ApiEndpoint"])

Question 2

Show APIs

To list the APIs registered in the account, use:

import boto3
import os
from dotenv import load_dotenv

load_dotenv()

api_gateway = boto3.client(
    "apigatewayv2",
    aws_access_key_id=os.getenv("AWS_ACCESS_KEY_ID"),
    aws_secret_access_key=os.getenv("AWS_SECRET_ACCESS_KEY"),
    region_name=os.getenv("AWS_REGION"),
)

response = api_gateway.get_apis(MaxResults="2000")

# Show APIs name and endpoint
print("APIs:")
for api in response["Items"]:
    print(f"- {api['Name']} ({api['ApiEndpoint']})")

Question 3

Practicing

Question 4