docs(tutorial): extract code examples

Makefile

@@ -90,3 +90,11 @@ changelog:
 
 mypy:
 	poetry run mypy --pretty aws_lambda_powertools
+
+format-examples:
+	poetry run isort docs/examples
+	poetry run black docs/examples/*/*.py
+
+lint-examples:
+	poetry run python3 -m py_compile docs/examples/*/*.py
+	cfn-lint docs/examples/*/*.yml

docs/examples/tutorial/add_route_hello_by_name.py

@@ -0,0 +1,10 @@
+import json
+
+
+def hello_name(name):
+    return {"statusCode": 200, "body": json.dumps({"message": f"hello {name}!"})}
+
+
+def lambda_handler(event, context):
+    name = event["pathParameters"]["name"]
+    return hello_name(name)

docs/examples/tutorial/add_route_temaplate.yml

@@ -0,0 +1,36 @@
+AWSTemplateFormatVersion: "2010-09-09"
+Transform: AWS::Serverless-2016-10-31
+Description: Sample SAM Template for powertools-quickstart
+Globals:
+    Function:
+        Timeout: 3
+Resources:
+    HelloWorldFunction:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: app.lambda_handler
+            Runtime: python3.9
+            Events:
+                HelloWorld:
+                    Type: Api
+                    Properties:
+                        Path: /hello
+                        Method: get
+
+    HelloWorldByNameFunctionName:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: hello_by_name.lambda_handler
+            Runtime: python3.9
+            Events:
+                HelloWorldName:
+                    Type: Api
+                    Properties:
+                        Path: /hello/{name}
+                        Method: get
+Outputs:
+    HelloWorldApi:
+        Description: "API Gateway endpoint URL for Prod stage for Hello World function"
+        Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"

docs/examples/tutorial/code_example_app.py

@@ -0,0 +1,9 @@
+import json
+
+
+def hello():
+    return {"statusCode": 200, "body": json.dumps({"message": "hello unknown!"})}
+
+
+def lambda_handler(event, context):
+    return hello()

docs/examples/tutorial/code_example_template.yml

@@ -0,0 +1,25 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Transform: AWS::Serverless-2016-10-31
+Description: Sample SAM Template for powertools-quickstart
+Globals:
+    Function:
+        Timeout: 3
+Resources:
+    HelloWorldFunction:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: app.lambda_handler
+            Runtime: python3.9
+            Architectures:
+                - x86_64
+            Events:
+                HelloWorld:
+                    Type: Api
+                    Properties:
+                        Path: /hello
+                        Method: get
+Outputs:
+    HelloWorldApi:
+        Description: "API Gateway endpoint URL for Prod stage for Hello World function"
+        Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"

docs/examples/tutorial/create_metrics_app.py

@@ -0,0 +1,71 @@
+import os
+
+import boto3
+
+from aws_lambda_powertools import Logger, Tracer
+from aws_lambda_powertools.event_handler import APIGatewayRestResolver
+from aws_lambda_powertools.logging import correlation_paths
+
+cold_start = True
+metric_namespace = "MyApp"
+
+logger = Logger(service="APP")
+tracer = Tracer(service="APP")
+metrics = boto3.client("cloudwatch")
+app = APIGatewayRestResolver()
+
+
+@tracer.capture_method
+def add_greeting_metric(service: str = "APP"):
+    function_name = os.getenv("AWS_LAMBDA_FUNCTION_NAME", "undefined")
+    service_dimension = {"Name": "service", "Value": service}
+    function_dimension = {"Name": "function_name", "Value": function_name}
+    is_cold_start = True
+
+    global cold_start
+    if cold_start:
+        cold_start = False
+    else:
+        is_cold_start = False
+
+    return metrics.put_metric_data(
+        MetricData=[
+            {
+                "MetricName": "SuccessfulGreetings",
+                "Dimensions": [service_dimension],
+                "Unit": "Count",
+                "Value": 1,
+            },
+            {
+                "MetricName": "ColdStart",
+                "Dimensions": [service_dimension, function_dimension],
+                "Unit": "Count",
+                "Value": int(is_cold_start),
+            },
+        ],
+        Namespace=metric_namespace,
+    )
+
+
+@app.get("/hello/<name>")
+@tracer.capture_method
+def hello_name(name):
+    tracer.put_annotation(key="User", value=name)
+    logger.info(f"Request from {name} received")
+    add_greeting_metric()
+    return {"message": f"hello {name}!"}
+
+
+@app.get("/hello")
+@tracer.capture_method
+def hello():
+    tracer.put_annotation(key="User", value="unknown")
+    logger.info("Request from unknown received")
+    add_greeting_metric()
+    return {"message": "hello unknown!"}
+
+
+@logger.inject_lambda_context(correlation_id_path=correlation_paths.API_GATEWAY_REST, log_event=True)
+@tracer.capture_lambda_handler
+def lambda_handler(event, context):
+    return app.resolve(event, context)

docs/examples/tutorial/create_metrics_template.yml

@@ -0,0 +1,31 @@
+AWSTemplateFormatVersion: "2010-09-09"
+Transform: AWS::Serverless-2016-10-31
+Description: Sample SAM Template for powertools-quickstart
+Globals:
+    Function:
+        Timeout: 3
+Resources:
+    HelloWorldFunction:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: app.lambda_handler
+            Runtime: python3.9
+            Tracing: Active
+            Events:
+                HelloWorld:
+                    Type: Api
+                    Properties:
+                        Path: /hello
+                        Method: get
+                HelloWorldName:
+                    Type: Api
+                    Properties:
+                        Path: /hello/{name}
+                        Method: get
+            Policies:
+                - CloudWatchPutMetricPolicy: {}
+Outputs:
+    HelloWorldApi:
+        Description: "API Gateway endpoint URL for Prod stage for Hello World function"
+        Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"

docs/examples/tutorial/create_own_router_app.py

@@ -0,0 +1,37 @@
+import json
+
+
+def hello_name(event, **kargs):
+    username = event["pathParameters"]["name"]
+    return {"statusCode": 200, "body": json.dumps({"message": f"hello {username}!"})}
+
+
+def hello(**kargs):
+    return {"statusCode": 200, "body": json.dumps({"message": "hello unknown!"})}
+
+
+class Router:
+    def __init__(self):
+        self.routes = {}
+
+    def set(self, path, method, handler):
+        self.routes[f"{path}-{method}"] = handler
+
+    def get(self, path, method):
+        try:
+            route = self.routes[f"{path}-{method}"]
+        except KeyError:
+            raise RuntimeError(f"Cannot route request to the correct method. path={path}, method={method}")
+        return route
+
+
+router = Router()
+router.set(path="/hello", method="GET", handler=hello)
+router.set(path="/hello/{name}", method="GET", handler=hello_name)
+
+
+def lambda_handler(event, context):
+    path = event["resource"]
+    http_method = event["httpMethod"]
+    method = router.get(path=path, method=http_method)
+    return method(event=event)

docs/examples/tutorial/create_own_router_template.yml

@@ -0,0 +1,28 @@
+AWSTemplateFormatVersion: "2010-09-09"
+Transform: AWS::Serverless-2016-10-31
+Description: Sample SAM Template for powertools-quickstart
+Globals:
+    Function:
+        Timeout: 3
+Resources:
+    HelloWorldFunction:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: app.lambda_handler
+            Runtime: python3.9
+            Events:
+                HelloWorld:
+                    Type: Api
+                    Properties:
+                        Path: /hello
+                        Method: get
+                HelloWorldName:
+                    Type: Api
+                    Properties:
+                        Path: /hello/{name}
+                        Method: get
+Outputs:
+    HelloWorldApi:
+        Description: "API Gateway endpoint URL for Prod stage for Hello World function"
+        Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"

docs/examples/tutorial/enrich_generate_traces_app.py

@@ -0,0 +1,47 @@
+from aws_xray_sdk.core import patch_all, xray_recorder
+
+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.event_handler import APIGatewayRestResolver
+from aws_lambda_powertools.logging import correlation_paths
+
+logger = Logger(service="APP")
+
+app = APIGatewayRestResolver()
+cold_start = True
+patch_all()
+
+
+@app.get("/hello/<name>")
+@xray_recorder.capture("hello_name")
+def hello_name(name):
+    subsegment = xray_recorder.current_subsegment()
+    subsegment.put_annotation(key="User", value=name)
+    logger.info(f"Request from {name} received")
+    return {"message": f"hello {name}!"}
+
+
+@app.get("/hello")
+@xray_recorder.capture("hello")
+def hello():
+    subsegment = xray_recorder.current_subsegment()
+    subsegment.put_annotation(key="User", value="unknown")
+    logger.info("Request from unknown received")
+    return {"message": "hello unknown!"}
+
+
+@logger.inject_lambda_context(correlation_id_path=correlation_paths.API_GATEWAY_REST, log_event=True)
+@xray_recorder.capture("handler")
+def lambda_handler(event, context):
+    global cold_start
+
+    subsegment = xray_recorder.current_subsegment()
+    if cold_start:
+        subsegment.put_annotation(key="ColdStart", value=cold_start)
+        cold_start = False
+    else:
+        subsegment.put_annotation(key="ColdStart", value=cold_start)
+
+    result = app.resolve(event, context)
+    subsegment.put_metadata("response", result)
+
+    return result

docs/examples/tutorial/event_handler_app.py

@@ -0,0 +1,17 @@
+from aws_lambda_powertools.event_handler import APIGatewayRestResolver
+
+app = APIGatewayRestResolver()
+
+
+@app.get("/hello/<name>")
+def hello_name(name):
+    return {"message": f"hello {name}!"}
+
+
+@app.get("/hello")
+def hello():
+    return {"message": "hello unknown!"}
+
+
+def lambda_handler(event, context):
+    return app.resolve(event, context)

docs/examples/tutorial/generate_traces_app.py

@@ -0,0 +1,29 @@
+from aws_xray_sdk.core import xray_recorder
+
+from aws_lambda_powertools import Logger
+from aws_lambda_powertools.event_handler import APIGatewayRestResolver
+from aws_lambda_powertools.logging import correlation_paths
+
+logger = Logger(service="APP")
+
+app = APIGatewayRestResolver()
+
+
+@app.get("/hello/<name>")
+@xray_recorder.capture("hello_name")
+def hello_name(name):
+    logger.info(f"Request from {name} received")
+    return {"message": f"hello {name}!"}
+
+
+@app.get("/hello")
+@xray_recorder.capture("hello")
+def hello():
+    logger.info("Request from unknown received")
+    return {"message": "hello unknown!"}
+
+
+@logger.inject_lambda_context(correlation_id_path=correlation_paths.API_GATEWAY_REST, log_event=True)
+@xray_recorder.capture("handler")
+def lambda_handler(event, context):
+    return app.resolve(event, context)

docs/examples/tutorial/generate_traces_template.yml

@@ -0,0 +1,31 @@
+AWSTemplateFormatVersion: "2010-09-09"
+Transform: AWS::Serverless-2016-10-31
+Description: Sample SAM Template for powertools-quickstart
+Globals:
+    Function:
+        Timeout: 3
+    Api:
+      TracingEnabled: true
+Resources:
+    HelloWorldFunction:
+        Type: AWS::Serverless::Function
+        Properties:
+            CodeUri: hello_world/
+            Handler: app.lambda_handler
+            Runtime: python3.9
+            Tracing: Active
+            Events:
+                HelloWorld:
+                    Type: Api
+                    Properties:
+                        Path: /hello
+                        Method: get
+                HelloWorldName:
+                    Type: Api
+                    Properties:
+                        Path: /hello/{name}
+                        Method: get
+Outputs:
+    HelloWorldApi:
+        Description: "API Gateway endpoint URL for Prod stage for Hello World function"
+        Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"