Serverless API

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "Generated by TheArchitect — https://www.thecloudarchitect.dev",
  "Metadata": {
    "TheArchitect": {
      "Edges": [
        {
          "From": "LambdaRoleiam",
          "To": "Lambdalambda",
          "Label": "role"
        },
        {
          "From": "Lambdalambda",
          "To": "ItemsTabledynamodb",
          "Label": "read/write"
        },
        {
          "From": "Lambdalambda",
          "To": "EventTopicsns",
          "Label": "events"
        },
        {
          "From": "Lambdalambda",
          "To": "ErrorAlarmcloudwatch",
          "Label": "logs"
        }
      ]
    }
  },
  "Resources": {
    "APIGatewayapigateway": {
      "Type": "AWS::ApiGateway::RestApi",
      "Properties": {
        "Name": "architect-demo-api",
        "Description": "Regional REST API for demo application requests.",
        "EndpointConfiguration": {
          "Types": [
            "REGIONAL"
          ]
        },
        "MinimumCompressionSize": 1024
      }
    },
    "Lambdalambda": {
      "Type": "AWS::Lambda::Function",
      "DependsOn": [
        "LambdaRoleiam"
      ],
      "Properties": {
        "FunctionName": "architect-demo-api-handler",
        "Runtime": "nodejs20.x",
        "Handler": "index.handler",
        "MemorySize": 512,
        "Architectures": [
          "arm64"
        ],
        "Timeout": 30,
        "Description": "Handles API requests and publishes application events.",
        "Environment": {
          "Variables": {
            "APP_ENV": "demo",
            "LOG_LEVEL": "info"
          }
        },
        "TracingConfig": {
          "Mode": "Active"
        },
        "Code": {
          "ZipFile": "exports.handler = async (event) => ({ statusCode: 200, body: JSON.stringify({ ok: true, requestId: event.requestContext?.requestId || 'demo' }) });"
        },
        "Role": {
          "Fn::GetAtt": [
            "LambdaRoleiam",
            "Arn"
          ]
        }
      }
    },
    "LambdaRoleiam": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "RoleName": "architect-demo-api-exec-role",
        "Description": "Execution role for the serverless API handler.",
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": "lambda.amazonaws.com"
              },
              "Action": "sts:AssumeRole"
            }
          ]
        },
        "ManagedPolicyArns": [
          "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
        ]
      }
    },
    "ItemsTabledynamodb": {
      "Type": "AWS::DynamoDB::Table",
      "Properties": {
        "TableName": "architect-demo-items",
        "BillingMode": "PAY_PER_REQUEST",
        "AttributeDefinitions": [
          {
            "AttributeName": "pk",
            "AttributeType": "S"
          },
          {
            "AttributeName": "sk",
            "AttributeType": "S"
          }
        ],
        "KeySchema": [
          {
            "AttributeName": "pk",
            "KeyType": "HASH"
          },
          {
            "AttributeName": "sk",
            "KeyType": "RANGE"
          }
        ],
        "PointInTimeRecoverySpecification": {
          "PointInTimeRecoveryEnabled": true
        },
        "SSESpecification": {
          "SSEEnabled": true
        }
      }
    },
    "EventTopicsns": {
      "Type": "AWS::SNS::Topic",
      "Properties": {
        "TopicName": "architect-demo-events",
        "DisplayName": "Architect demo events"
      }
    },
    "ErrorAlarmcloudwatch": {
      "Type": "AWS::CloudWatch::Alarm",
      "Properties": {
        "AlarmName": "architect-demo-api-errors",
        "AlarmDescription": "Demo alarm for API Lambda errors.",
        "Namespace": "AWS/Lambda",
        "MetricName": "Errors",
        "Statistic": "Sum",
        "Period": 60,
        "EvaluationPeriods": 1,
        "Threshold": 1,
        "ComparisonOperator": "GreaterThanOrEqualToThreshold",
        "TreatMissingData": "notBreaching"
      }
    },
    "LambdalambdaEventTopicsnsPermission": {
      "Type": "AWS::Lambda::Permission",
      "DependsOn": [
        "Lambdalambda",
        "EventTopicsns"
      ],
      "Properties": {
        "Action": "lambda:InvokeFunction",
        "FunctionName": {
          "Ref": "Lambdalambda"
        },
        "Principal": "sns.amazonaws.com",
        "SourceArn": {
          "Ref": "EventTopicsns"
        }
      }
    },
    "EventTopicsnsLambdalambdaSubscription": {
      "Type": "AWS::SNS::Subscription",
      "DependsOn": [
        "LambdalambdaEventTopicsnsPermission"
      ],
      "Properties": {
        "TopicArn": {
          "Ref": "EventTopicsns"
        },
        "Protocol": "lambda",
        "Endpoint": {
          "Fn::GetAtt": [
            "Lambdalambda",
            "Arn"
          ]
        }
      }
    }
  }
}