add courses

courses-events/Makefile

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+build:
+	sam build --use-container
+
+deploy: build
+	sam deploy --debug

courses-events/app/boto3clients.py

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+import os
+
+import boto3
+
+
+def get_dynamodb_client():
+    if os.getenv('AWS_LAMBDA_FUNCTION_NAME'):
+        return boto3.client('dynamodb')
+
+    return boto3.client('dynamodb', endpoint_url='http://localhost:8000')
+
+
+dynamodb_client = get_dynamodb_client()

courses-events/app/config.py

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+import os
+
+COURSE_TABLE: str = os.environ.get('COURSE_TABLE')  # type: ignore
+API_URL = 'https://eduseg.com.br/api'

courses-events/app/events/daily_sync_course_metadata.py

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+import requests
+from aws_lambda_powertools.utilities.data_classes import (
+    DynamoDBStreamEvent,
+    event_source,
+)
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dateutils import now
+from layercake.dynamodb import DynamoDBPersistenceLayer
+
+from boto3clients import dynamodb_client
+from config import API_URL, COURSE_TABLE
+
+course_layer = DynamoDBPersistenceLayer(COURSE_TABLE, dynamodb_client)
+
+
+@event_source(data_class=DynamoDBStreamEvent)
+def lambda_handler(event: DynamoDBStreamEvent, context: LambdaContext) -> bool:
+    r = requests.get(f'{API_URL}/courses.json')
+    r.raise_for_status()
+
+    data = r.json()
+    now_ = now()
+
+    with course_layer.batch_writer() as batch:
+        for course in data:
+            batch.put_item(
+                {
+                    'id': {'S': course['id']},
+                    'sk': {'S': 'metadata#unit_price'},
+                    'unit_price': {'N': str(course['metadata']['unit_price'])},
+                    'create_date': {'S': now_.isoformat()},
+                }
+            )
+
+    return True

courses-events/pyproject.toml

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+[project]
+name = "courses-events"
+version = "0.1.0"
+description = ""
+readme = ""
+requires-python = ">=3.13"
+dependencies = [
+    "layercake",
+]
+
+[dependency-groups]
+dev = [
+    "pytest>=8.3.4",
+    "pytest-cov>=6.0.0",
+    "ruff>=0.9.1",
+]
+
+[tool.pytest.ini_options]
+pythonpath = ["app/"]
+addopts = "--cov --cov-report html -v"
+
+[tool.ruff]
+target-version = "py311"
+src = ["app"]
+
+[tool.ruff.format]
+quote-style = "single"
+
+[tool.ruff.lint]
+select = ["E", "F", "I"]
+
+[tool.uv.sources]
+layercake = { path = "../layercake" }

courses-events/pyrightconfig.json

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+{
+  "extraPaths": ["app/"]
+}

courses-events/samconfig.toml

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+version = 0.1
+[default.deploy.parameters]
+stack_name = "saladeaula-courses-events"
+resolve_s3 = true
+s3_prefix = "courses-events"
+region = "sa-east-1"
+confirm_changeset = false
+capabilities = "CAPABILITY_IAM"
+image_repositories = []

courses-events/template.yaml

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+AWSTemplateFormatVersion: 2010-09-09
+Transform: AWS::Serverless-2016-10-31
+
+Parameters:
+  CourseTable:
+    Type: String
+    Default: saladeaula_courses
+
+Globals:
+  Function:
+    CodeUri: app/
+    Runtime: python3.13
+    Tracing: Active
+    Architectures:
+      - x86_64
+    Layers:
+      - !Sub arn:aws:lambda:sa-east-1:336641857101:layer:layercake:79
+    Environment:
+      Variables:
+        TZ: America/Sao_Paulo
+        LOG_LEVEL: DEBUG
+        POWERTOOLS_LOGGER_SAMPLE_RATE: 0.1
+        POWERTOOLS_LOGGER_LOG_EVENT: true
+        DYNAMODB_PARTITION_KEY: id
+        COURSE_TABLE: !Ref CourseTable
+
+Resources:
+  EventLog:
+    Type: AWS::Logs::LogGroup
+    Properties:
+      RetentionInDays: 90
+
+  EventDailySyncCourseMetadataFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: events.daily_sync_course_metadata.lambda_handler
+      LoggingConfig:
+        LogGroup: !Ref EventLog
+      Policies:
+        - DynamoDBWritePolicy:
+            TableName: !Ref CourseTable
+      Events:
+        Rule:
+          Type: ScheduleV2
+          Properties:
+            ScheduleExpression: cron(0 0 * * ? *)
+            ScheduleExpressionTimezone: America/Sao_Paulo

courses-events/tests/conftest.py

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+import os
+from dataclasses import dataclass
+
+import pytest
+
+PYTEST_TABLE_NAME = 'pytest'
+PK = 'id'
+SK = 'sk'
+
+
+# https://docs.pytest.org/en/7.1.x/reference/reference.html#pytest.hookspec.pytest_configure
+def pytest_configure():
+    os.environ['TZ'] = 'America/Sao_Paulo'
+    os.environ['DYNAMODB_PARTITION_KEY'] = PK
+    os.environ['DYNAMODB_SORT_KEY'] = SK
+    os.environ['COURSE_TABLE'] = PYTEST_TABLE_NAME
+
+
+@dataclass
+class LambdaContext:
+    function_name: str = 'test'
+    memory_limit_in_mb: int = 128
+    invoked_function_arn: str = 'arn:aws:lambda:eu-west-1:809313241:function:test'
+    aws_request_id: str = '52fdfc07-2182-154f-163f-5f0f9a621d72'
+
+
+@pytest.fixture
+def lambda_context() -> LambdaContext:
+    return LambdaContext()
+
+
+@pytest.fixture
+def dynamodb_client():
+    from boto3clients import dynamodb_client as client
+
+    client.create_table(
+        AttributeDefinitions=[
+            {'AttributeName': PK, 'AttributeType': 'S'},
+            {'AttributeName': SK, 'AttributeType': 'S'},
+        ],
+        TableName=PYTEST_TABLE_NAME,
+        KeySchema=[
+            {'AttributeName': PK, 'KeyType': 'HASH'},
+            {'AttributeName': SK, 'KeyType': 'RANGE'},
+        ],
+        ProvisionedThroughput={
+            'ReadCapacityUnits': 123,
+            'WriteCapacityUnits': 123,
+        },
+    )
+
+    yield client
+
+    client.delete_table(TableName=PYTEST_TABLE_NAME)
+
+
+@pytest.fixture()
+def dynamodb_persistence_layer(dynamodb_client):
+    from layercake.dynamodb import DynamoDBPersistenceLayer
+
+    return DynamoDBPersistenceLayer(PYTEST_TABLE_NAME, dynamodb_client)

courses-events/tests/events/test_daily_sync_course_metadata.py

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+import app.events.daily_sync_course_metadata as app
+from aws_lambda_powertools.utilities.typing import LambdaContext
+from layercake.dynamodb import DynamoDBPersistenceLayer, KeyPair
+
+
+def test_daily_sync_course_metadata(
+    dynamodb_client,
+    dynamodb_persistence_layer: DynamoDBPersistenceLayer,
+    lambda_context: LambdaContext,
+):
+    app.lambda_handler({}, lambda_context)  # type: ignore
+
+    collection = dynamodb_persistence_layer.collection
+    item = collection.get_item(
+        KeyPair('a810dd22-56c0-4d9b-8cd2-7e2ee9c45839', 'metadata#unit_price')
+    )
+
+    assert item