Log dan pantau fungsi Python Lambda

Buka halaman Grup log di CloudWatch konsol.

Pilih grup log untuk fungsi Anda (/aws/lambda/your-function-name).

Pilih pengaliran log.

Inisialisasi aplikasi menggunakan template Hello World Python.

sam init --app-template hello-world-powertools-python --name sam-app --package-type Zip --runtime python3.9 --no-tracing

Bangun aplikasi.

cd sam-app && sam build

Terapkan aplikasi.

sam deploy --guided

Ikuti petunjuk di layar. Untuk menerima opsi default yang disediakan dalam pengalaman interaktif, tekanEnter.

Dapatkan URL aplikasi yang digunakan:

aws cloudformation describe-stacks --stack-name sam-app --query 'Stacks[0].Outputs[?OutputKey==`HelloWorldApi`].OutputValue' --output text

Memanggil titik akhir API:

curl GET <URL_FROM_PREVIOUS_STEP>

Jika berhasil, Anda akan melihat respons ini:

{"message":"hello world"}

Untuk mendapatkan log untuk fungsi tersebut, jalankan sam logs. Untuk informasi selengkapnya, lihat Bekerja dengan log di Panduan AWS Serverless Application Model Pengembang.

sam logs --stack-name sam-app

Output log terlihat seperti ini:

2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:50.371000 INIT_START Runtime Version: python:3.9.v16    Runtime Version ARN: arn:aws:lambda:us-east-1::runtime:07a48df201798d627f2b950f03bb227aab4a655a1d019c3296406f95937e2525
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.112000 START RequestId: d455cfc4-7704-46df-901b-2a5cce9405be Version: $LATEST
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.114000 {
  "level": "INFO",
  "location": "hello:23",
  "message": "Hello world API - HTTP 200",
  "timestamp": "2025-02-03 14:59:51,113+0000",
  "service": "PowertoolsHelloWorld",
  "cold_start": true,
  "function_name": "sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "function_memory_size": "128",
  "function_arn": "arn:aws:lambda:us-east-1:111122223333:function:sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "function_request_id": "d455cfc4-7704-46df-901b-2a5cce9405be",
  "correlation_id": "e73f8aef-5e07-436e-a30b-63e4b23f0047",
  "xray_trace_id": "1-63dd2166-434a12c22e1307ff2114f299"
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.126000 {
  "_aws": {
    "Timestamp": 1675436391126,
    "CloudWatchMetrics": [
      {
        "Namespace": "Powertools",
        "Dimensions": [
          [
            "function_name",
            "service"
          ]
        ],
        "Metrics": [
          {
            "Name": "ColdStart",
            "Unit": "Count"
          }
        ]
      }
    ]
  },
  "function_name": "sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "service": "PowertoolsHelloWorld",
  "ColdStart": [
    1.0
  ]
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.126000 {
  "_aws": {
    "Timestamp": 1675436391126,
    "CloudWatchMetrics": [
      {
        "Namespace": "Powertools",
        "Dimensions": [
          [
            "service"
          ]
        ],
        "Metrics": [
          {
            "Name": "HelloWorldInvocations",
            "Unit": "Count"
          }
        ]
      }
    ]
  },
  "service": "PowertoolsHelloWorld",
  "HelloWorldInvocations": [
    1.0
  ]
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.128000 END RequestId: d455cfc4-7704-46df-901b-2a5cce9405be
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.128000 REPORT RequestId: d455cfc4-7704-46df-901b-2a5cce9405be    Duration: 16.33 ms    Billed Duration: 756 ms    Memory Size: 128 MB    Max Memory Used: 64 MB    Init Duration: 739.46 ms    
XRAY TraceId: 1-63dd2166-434a12c22e1307ff2114f299    SegmentId: 3c5d18d735a1ced0    Sampled: true

Ini adalah titik akhir API publik yang dapat diakses melalui internet. Kami menyarankan Anda menghapus titik akhir setelah pengujian.

sam delete

Buat direktori proyek untuk aplikasi baru Anda.

mkdir hello-world
cd hello-world

Inisialisasi aplikasi.

cdk init app --language python

Instal dependensi Python.

pip install -r requirements.txt

Buat direktori lambda_function di bawah folder root.

mkdir lambda_function
cd lambda_function

Buat file app.py dan tambahkan kode berikut ke file. Ini adalah kode untuk fungsi Lambda.

from aws_lambda_powertools.event_handler import APIGatewayRestResolver
from aws_lambda_powertools.utilities.typing import LambdaContext
from aws_lambda_powertools.logging import correlation_paths
from aws_lambda_powertools import Logger
from aws_lambda_powertools import Tracer
from aws_lambda_powertools import Metrics
from aws_lambda_powertools.metrics import MetricUnit

app = APIGatewayRestResolver()
tracer = Tracer()
logger = Logger()
metrics = Metrics(namespace="PowertoolsSample")

@app.get("/hello")
@tracer.capture_method
def hello():
    # adding custom metrics
    # See: https://docs.aws.amazon.com/powertools/python/latest//latest/core/metrics/
    metrics.add_metric(name="HelloWorldInvocations", unit=MetricUnit.Count, value=1)

    # structured log
    # See: https://docs.aws.amazon.com/powertools/python/latest//latest/core/logger/
    logger.info("Hello world API - HTTP 200")
    return {"message": "hello world"}

# Enrich logging with contextual information from Lambda
@logger.inject_lambda_context(correlation_id_path=correlation_paths.API_GATEWAY_REST)
# Adding tracer
# See: https://docs.aws.amazon.com/powertools/python/latest//latest/core/tracer/
@tracer.capture_lambda_handler
# ensures metrics are flushed upon request completion/failure and capturing ColdStart metric
@metrics.log_metrics(capture_cold_start_metric=True)
def lambda_handler(event: dict, context: LambdaContext) -> dict:
    return app.resolve(event, context)

Buka direktori hello_world. Anda akan melihat file bernama hello_world_stack.py.

cd ..
cd hello_world

Buka hello_world_stack.py dan tambahkan kode berikut ke file. Ini berisi Lambda Constructor, yang membuat fungsi Lambda, mengonfigurasi variabel lingkungan untuk Powertools dan menetapkan retensi log ke satu minggu, dan ApiGatewayv 1 Constructor, yang membuat REST API.

from aws_cdk import (
    Stack,
    aws_apigateway as apigwv1,
    aws_lambda as lambda_,
    CfnOutput,
    Duration
)
from constructs import Construct

class HelloWorldStack(Stack):

    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        # Powertools Lambda Layer
        powertools_layer = lambda_.LayerVersion.from_layer_version_arn(
            self,
            id="lambda-powertools",
            # Using AWS Lambda Powertools with Lambda Layer
            # This imports the Powertools layer which provides observability features for Lambda functions
            # For available versions, see: https://docs.aws.amazon.com/powertools/python/latest/#lambda-layer
        )

        function = lambda_.Function(self,
            'sample-app-lambda',
            runtime=lambda_.Runtime.PYTHON_3_9,
            layers=[powertools_layer],
            code = lambda_.Code.from_asset("./lambda_function/"),
            handler="app.lambda_handler",
            memory_size=128,
            timeout=Duration.seconds(3),
            architecture=lambda_.Architecture.X86_64,
            environment={
                "POWERTOOLS_SERVICE_NAME": "PowertoolsHelloWorld",
                "POWERTOOLS_METRICS_NAMESPACE": "PowertoolsSample",
                "LOG_LEVEL": "INFO"
            }
        )

        apigw = apigwv1.RestApi(self, "PowertoolsAPI", deploy_options=apigwv1.StageOptions(stage_name="dev"))

        hello_api = apigw.root.add_resource("hello")
        hello_api.add_method("GET", apigwv1.LambdaIntegration(function, proxy=True))

        CfnOutput(self, "apiUrl", value=f"{apigw.url}hello")

Men-deploy aplikasi Anda.

cd ..
cdk deploy

Dapatkan URL aplikasi yang digunakan:

aws cloudformation describe-stacks --stack-name HelloWorldStack --query 'Stacks[0].Outputs[?OutputKey==`apiUrl`].OutputValue' --output text

Memanggil titik akhir API:

curl GET <URL_FROM_PREVIOUS_STEP>

Jika berhasil, Anda akan melihat respons ini:

{"message":"hello world"}

Untuk mendapatkan log untuk fungsi tersebut, jalankan sam logs. Untuk informasi selengkapnya, lihat Bekerja dengan log di Panduan AWS Serverless Application Model Pengembang.

sam logs --stack-name HelloWorldStack

Output log terlihat seperti ini:

2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:50.371000 INIT_START Runtime Version: python:3.9.v16    Runtime Version ARN: arn:aws:lambda:us-east-1::runtime:07a48df201798d627f2b950f03bb227aab4a655a1d019c3296406f95937e2525
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.112000 START RequestId: d455cfc4-7704-46df-901b-2a5cce9405be Version: $LATEST
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.114000 {
  "level": "INFO",
  "location": "hello:23",
    "message": "Hello world API - HTTP 200",
  "timestamp": "2025-02-03 14:59:51,113+0000",
  "service": "PowertoolsHelloWorld",
  "cold_start": true,
  "function_name": "sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "function_memory_size": "128",
  "function_arn": "arn:aws:lambda:us-east-1:111122223333:function:sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "function_request_id": "d455cfc4-7704-46df-901b-2a5cce9405be",
  "correlation_id": "e73f8aef-5e07-436e-a30b-63e4b23f0047",
  "xray_trace_id": "1-63dd2166-434a12c22e1307ff2114f299"
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.126000 {
  "_aws": {
    "Timestamp": 1675436391126,
    "CloudWatchMetrics": [
      {
        "Namespace": "Powertools",
        "Dimensions": [
          [
            "function_name",
            "service"
          ]
        ],
        "Metrics": [
          {
            "Name": "ColdStart",
            "Unit": "Count"
          }
        ]
      }
    ]
  },
  "function_name": "sam-app-HelloWorldFunction-YBg8yfYtOc9j",
  "service": "PowertoolsHelloWorld",
  "ColdStart": [
    1.0
  ]
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.126000 {
  "_aws": {
    "Timestamp": 1675436391126,
    "CloudWatchMetrics": [
      {
        "Namespace": "Powertools",
        "Dimensions": [
          [
            "service"
          ]
        ],
        "Metrics": [
          {
            "Name": "HelloWorldInvocations",
            "Unit": "Count"
          }
        ]
      }
    ]
  },
  "service": "PowertoolsHelloWorld",
  "HelloWorldInvocations": [
    1.0
  ]
}
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.128000 END RequestId: d455cfc4-7704-46df-901b-2a5cce9405be
2025/02/03/[$LATEST]ea9a64ec87294bf6bbc9026c05a01e04 2025-02-03T14:59:51.128000 REPORT RequestId: d455cfc4-7704-46df-901b-2a5cce9405be    Duration: 16.33 ms    Billed Duration: 756 ms    Memory Size: 128 MB    Max Memory Used: 64 MB    Init Duration: 739.46 ms    
XRAY TraceId: 1-63dd2166-434a12c22e1307ff2114f299    SegmentId: 3c5d18d735a1ced0    Sampled: true

Ini adalah titik akhir API publik yang dapat diakses melalui internet. Kami menyarankan Anda menghapus titik akhir setelah pengujian.

cdk destroy