docs: refresh SAM examples

examples/lambda-functions/common/constants.ts

@@ -0,0 +1,6 @@
+// Get the DynamoDB table name from environment variables
+const tableName = process.env.SAMPLE_TABLE;
+
+export {
+  tableName
+};

examples/lambda-functions/common/dynamodb-client.ts

@@ -0,0 +1,29 @@
+import { DynamoDBClient } from '@aws-sdk/client-dynamodb';
+import { DynamoDBDocumentClient } from '@aws-sdk/lib-dynamodb';
+import { tracer } from './powertools';
+
+// Create DynamoDB Client and patch it for tracing
+const ddbClient = tracer.captureAWSv3Client(new DynamoDBClient({}));
+
+const marshallOptions = {
+  // Whether to automatically convert empty strings, blobs, and sets to `null`.
+  convertEmptyValues: false, // false, by default.
+  // Whether to remove undefined values while marshalling.
+  removeUndefinedValues: false, // false, by default.
+  // Whether to convert typeof object to map attribute.
+  convertClassInstanceToMap: false, // false, by default.
+};
+
+const unmarshallOptions = {
+  // Whether to return numbers as a string instead of converting them to native JavaScript numbers.
+  wrapNumbers: false, // false, by default.
+};
+
+const translateConfig = { marshallOptions, unmarshallOptions };
+
+// Create the DynamoDB Document client.
+const docClient = DynamoDBDocumentClient.from(ddbClient, translateConfig);
+
+export {
+  docClient
+};

examples/lambda-functions/common/powertools.ts

@@ -0,0 +1,32 @@
+import { Logger } from '@aws-lambda-powertools/logger';
+import { Metrics } from '@aws-lambda-powertools/metrics';
+import { Tracer } from '@aws-lambda-powertools/tracer';
+
+const awsLambdaPowertoolsVersion = '1.4.1';
+
+const defaultValues = {
+  region: process.env.AWS_REGION || 'N/A',
+  executionEnv: process.env.AWS_EXECUTION_ENV || 'N/A'
+};
+
+const logger = new Logger({
+  persistentLogAttributes: {
+    ...defaultValues,
+    logger: {
+      name: '@aws-lambda-powertools/logger',
+      version: awsLambdaPowertoolsVersion,
+    }
+  },
+});
+
+const metrics = new Metrics({
+  defaultDimensions: defaultValues
+});
+
+const tracer = new Tracer();
+
+export {
+  logger,
+  metrics,
+  tracer
+};

examples/lambda-functions/get-all-items.ts

@@ -1,20 +1,23 @@
 import { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from 'aws-lambda';
-import { Metrics } from '@aws-lambda-powertools/metrics';
-import { Logger } from '@aws-lambda-powertools/logger';
-import { Tracer } from '@aws-lambda-powertools/tracer';
-import { DocumentClient } from 'aws-sdk/clients/dynamodb';
-
-// Create the PowerTools clients
-const metrics = new Metrics();
-const logger = new Logger();
-const tracer = new Tracer();
-
-// Create DynamoDB DocumentClient and patch it for tracing
-const docClient = tracer.captureAWSClient(new DocumentClient());
-
-// Get the DynamoDB table name from environment variables
-const tableName = process.env.SAMPLE_TABLE;
-
+import middy from '@middy/core';
+import { tableName } from './common/constants';
+import { logger, tracer, metrics } from './common/powertools';
+import { logMetrics } from '@aws-lambda-powertools/metrics';
+import { injectLambdaContext } from '@aws-lambda-powertools/logger';
+import { captureLambdaHandler } from '@aws-lambda-powertools/tracer';
+import { docClient } from './common/dynamodb-client';
+import { ScanCommand } from '@aws-sdk/lib-dynamodb';
+import got from 'got';
+
+/*
+ *
+ * This example uses the Middy middleware instrumentation.
+ * It is the best choice if your existing code base relies on the Middy middleware engine. 
+ * Powertools offers compatible Middy middleware to make this integration seamless.
+ * Find more Information in the docs: https://awslabs.github.io/aws-lambda-powertools-typescript/
+ * 
+ */
+
 /**
  *
  * Event doc: https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
@@ -24,45 +27,47 @@ const tableName = process.env.SAMPLE_TABLE;
  * @returns {Object} object - API Gateway Lambda Proxy Output Format
  *
  */
-export const getAllItemsHandler = async (event: APIGatewayProxyEvent, context: Context): Promise<APIGatewayProxyResult> => {
+const getAllItemsHandler = async (event: APIGatewayProxyEvent, context: Context): Promise<APIGatewayProxyResult> => {
   if (event.httpMethod !== 'GET') {
     throw new Error(`getAllItems only accepts GET method, you tried: ${event.httpMethod}`);
   }
 
-  // Tracer: Get facade segment created by AWS Lambda
-  const segment = tracer.getSegment();
+  // Tracer: Add awsRequestId as annotation
+  tracer.putAnnotation('awsRequestId', context.awsRequestId);
+
+  // Logger: Append awsRequestId to each log statement
+  logger.appendKeys({
+    awsRequestId: context.awsRequestId,
+  });
 
-  // Tracer: Create subsegment for the function & set it as active
-  const handlerSegment = segment.addNewSubsegment(`## ${process.env._HANDLER}`);
-  tracer.setSegment(handlerSegment);
+  // Request a sample random uuid from a webservice
+  const res = await got('https://httpbin.org/uuid');
+  const uuid = JSON.parse(res.body).uuid;
 
-  // Tracer: Annotate the subsegment with the cold start & serviceName
-  tracer.annotateColdStart();
-  tracer.addServiceNameAnnotation();
+  // Logger: Append uuid to each log statement
+  logger.appendKeys({ uuid });
 
-  // Tracer: Add annotation for the awsRequestId
-  tracer.putAnnotation('awsRequestId', context.awsRequestId);
+  // Tracer: Add uuid as annotation
+  tracer.putAnnotation('uuid', uuid);
 
-  // Metrics: Capture cold start metrics
-  metrics.captureColdStartMetric();
+  // Metrics: Add uuid as metadata
+  metrics.addMetadata('uuid', uuid);
 
-  // Logger: Add persistent attributes to each log statement
-  logger.addPersistentLogAttributes({
-    awsRequestId: context.awsRequestId,
-  });
+  // Define response object
+  let response;
 
   // get all items from the table (only first 1MB data, you can use `LastEvaluatedKey` to get the rest of data)
   // https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#scan-property
   // https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_Scan.html
-  let response;
   try {
     if (!tableName) {
       throw new Error('SAMPLE_TABLE environment variable is not set');
     }
 
-    const data = await docClient.scan({
+    const data = await docClient.send(new ScanCommand({
       TableName: tableName
-    }).promise();
+    }));
+
     const items = data.Items;
 
     // Logger: All log statements are written to CloudWatch
@@ -81,14 +86,17 @@ export const getAllItemsHandler = async (event: APIGatewayProxyEvent, context: C
     };
   }
 
-  // Tracer: Close subsegment (the AWS Lambda one is closed automatically)
-  handlerSegment.close(); // (## index.handler)
-
-  // Tracer: Set the facade segment as active again (the one created by AWS Lambda)
-  tracer.setSegment(segment);
-
   // All log statements are written to CloudWatch
   logger.info(`response from: ${event.path} statusCode: ${response.statusCode} body: ${response.body}`);
 
   return response;
-};
+};
+
+// Wrap the handler with middy
+export const handler = middy(getAllItemsHandler)
+// Use the middleware by passing the Metrics instance as a parameter
+  .use(logMetrics(metrics))
+// Use the middleware by passing the Logger instance as a parameter
+  .use(injectLambdaContext(logger, { logEvent: true }))
+// Use the middleware by passing the Tracer instance as a parameter
+  .use(captureLambdaHandler(tracer, { captureResponse: false })); // by default the tracer would add the response as metadata on the segment, but there is a chance to hit the 64kb segment size limit. Therefore set captureResponse: false

examples/lambda-functions/get-by-id.ts

@@ -1,19 +1,19 @@
 import { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from 'aws-lambda';
-import { Metrics } from '@aws-lambda-powertools/metrics';
-import { Logger } from '@aws-lambda-powertools/logger';
-import { Tracer } from '@aws-lambda-powertools/tracer';
-import { DocumentClient } from 'aws-sdk/clients/dynamodb';
-
-// Create the PowerTools clients
-const metrics = new Metrics();
-const logger = new Logger();
-const tracer = new Tracer();
-
-// Create DynamoDB DocumentClient and patch it for tracing
-const docClient = tracer.captureAWSClient(new DocumentClient());
-
-// Get the DynamoDB table name from environment variables
-const tableName = process.env.SAMPLE_TABLE;
+import { tableName } from './common/constants';
+import { logger, tracer, metrics } from './common/powertools';
+import { LambdaInterface } from '@aws-lambda-powertools/commons';
+import { docClient } from './common/dynamodb-client';
+import { GetItemCommand } from '@aws-sdk/lib-dynamodb';
+import got from 'got';
+
+/*
+ *
+ * This example uses the Method decorator instrumentation.
+ * Use TypeScript method decorators if you prefer writing your business logic using TypeScript Classes.
+ * If you aren’t using Classes, this requires the most significant refactoring.
+ * Find more Information in the docs: https://awslabs.github.io/aws-lambda-powertools-typescript/
+ * 
+ */
 
 /**
  *
@@ -25,72 +25,89 @@ const tableName = process.env.SAMPLE_TABLE;
  *
  */
 
-export const getByIdHandler = async (event: APIGatewayProxyEvent, context: Context): Promise<APIGatewayProxyResult> => {
-  if (event.httpMethod !== 'GET') {
-    throw new Error(`getById only accepts GET method, you tried: ${event.httpMethod}`);
+class Lambda implements LambdaInterface {
+
+  @tracer.captureMethod()
+  public async getUuid(): Promise<string> {
+    // Request a sample random uuid from a webservice
+    const res = await got('https://httpbin.org/uuid');
+
+    return JSON.parse(res.body).uuid;
   }
-  // Tracer: Get facade segment created by AWS Lambda
-  const segment = tracer.getSegment();
-
-  // Tracer: Create subsegment for the function & set it as active
-  const handlerSegment = segment.addNewSubsegment(`## ${process.env._HANDLER}`);
-  tracer.setSegment(handlerSegment);
-
-  // Tracer: Annotate the subsegment with the cold start & serviceName
-  tracer.annotateColdStart();
-  tracer.addServiceNameAnnotation();
-
-  // Tracer: Add annotation for the awsRequestId
-  tracer.putAnnotation('awsRequestId', context.awsRequestId);
-
-  // Metrics: Capture cold start metrics
-  metrics.captureColdStartMetric();
-
-  // Logger: Add persistent attributes to each log statement
-  logger.addPersistentLogAttributes({
-    awsRequestId: context.awsRequestId,
-  });
-
-  // Get the item from the table
-  // https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#get-property
-  let response;
-  try {
-    if (!tableName) {
-      throw new Error('SAMPLE_TABLE environment variable is not set');
-    }
-    if (!event.pathParameters) {
-      throw new Error('event does not contain pathParameters');
-    }
-    if (!event.pathParameters.id) {
-      throw new Error('PathParameter id is missing');
+
+  @tracer.captureLambdaHandler({ captureResponse: false }) // by default the tracer would add the response as metadata on the segment, but there is a chance to hit the 64kb segment size limit. Therefore set captureResponse: false
+  @logger.injectLambdaContext({ logEvent: true })
+  @metrics.logMetrics({ throwOnEmptyMetrics: false, captureColdStartMetric: true })
+  public async handler(event: APIGatewayProxyEvent, context: Context): Promise<APIGatewayProxyResult> {
+
+    if (event.httpMethod !== 'GET') {
+      throw new Error(`getById only accepts GET method, you tried: ${event.httpMethod}`);
     }
 
-    const data = await docClient.get({
-      TableName: tableName,
-      Key: { id: event.pathParameters.id },
-    }).promise();
-    const item = data.Item;
-    response = {
-      statusCode: 200,
-      body: JSON.stringify(item)
-    };
-  } catch (err) {
-    tracer.addErrorAsMetadata(err as Error);
-    logger.error('Error reading from table. ' + err);
-    response = {
-      statusCode: 500,
-      body: JSON.stringify({ 'error': 'Error reading from table.' })
-    };
-  }
+    // Tracer: Add awsRequestId as annotation
+    tracer.putAnnotation('awsRequestId', context.awsRequestId);
+
+    // Logger: Append awsRequestId to each log statement
+    logger.appendKeys({
+      awsRequestId: context.awsRequestId,
+    });
+
+    // Call the getUuid function
+    const uuid = await this.getUuid();
+
+    // Logger: Append uuid to each log statement
+    logger.appendKeys({ uuid });
+
+    // Tracer: Add uuid as annotation
+    tracer.putAnnotation('uuid', uuid);
+
+    // Metrics: Add uuid as metadata
+    metrics.addMetadata('uuid', uuid);
+
+    // Define response object
+    let response;
+
+    // Get the item from the table
+    // https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB/DocumentClient.html#get-property
+    try {
+      if (!tableName) {
+        throw new Error('SAMPLE_TABLE environment variable is not set');
+      }
+      if (!event.pathParameters) {
+        throw new Error('event does not contain pathParameters');
+      }
+      if (!event.pathParameters.id) {
+        throw new Error('PathParameter id is missing');
+      }
+      const data = await docClient.send(new GetItemCommand({
+        TableName: tableName,
+        Key: { id: 
+                {
+                  S: event.pathParameters.id 
+                } 
+        },
+      }));
+      const item = data.Item;
+      response = {
+        statusCode: 200,
+        body: JSON.stringify(item)
+      };
+    } catch (err) {
+      tracer.addErrorAsMetadata(err as Error);
+      logger.error('Error reading from table. ' + err);
+      response = {
+        statusCode: 500,
+        body: JSON.stringify({ 'error': 'Error reading from table.' })
+      };
+    }
 
-  // Tracer: Close subsegment (the AWS Lambda one is closed automatically)
-  handlerSegment.close(); // (## index.handler)
+    // All log statements are written to CloudWatch
+    logger.info(`response from: ${event.path} statusCode: ${response.statusCode} body: ${response.body}`);
 
-  // Tracer: Set the facade segment as active again (the one created by AWS Lambda)
-  tracer.setSegment(segment);
+    return response;
+  }
 
-  // All log statements are written to CloudWatch
-  logger.info(`response from: ${event.path} statusCode: ${response.statusCode} body: ${response.body}`);
+}
 
-  return response;
-};
+const handlerClass = new Lambda();
+export const handler = handlerClass.handler.bind(handlerClass);