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docs(tracer): extract Tracer code snippets in separate files (#1229)
* docs(tracer): extract Tracer code snippets in separate files #1219 * fix(docs): code snippet captureMethodDecorator.ts and code snippet disableCaptureResponseMethod.ts
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‎docs/core/tracer.md‎

Lines changed: 18 additions & 238 deletions
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@@ -37,13 +37,7 @@ The `Tracer` utility must always be instantiated outside of the Lambda handler.
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=== "handler.ts"
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```typescript hl_lines="1 3"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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export const handler = async (_event, _context): Promise<void> => {
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// ...
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};
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--8<-- "docs/snippets/tracer/basicUsage.ts"
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```
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### Utility settings
@@ -68,15 +62,7 @@ The `Tracer` utility is instantiated outside of the Lambda handler. In doing thi
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=== "handler.ts"
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```typescript hl_lines="1 4"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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// Tracer parameter fetched from the environment variables (see template.yaml tab)
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const tracer = new Tracer();
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// You can also pass the parameter in the constructor
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// const tracer = new Tracer({
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// serviceName: 'serverlessAirline'
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// });
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--8<-- "docs/snippets/tracer/sam.ts"
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```
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=== "template.yml"
@@ -104,19 +90,7 @@ You can quickly start by importing the `Tracer` class, initialize it outside the
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Learn more about [its usage and lifecycle in the official Middy documentation](https://middy.js.org/docs/intro/getting-started){target="_blank"}.
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```typescript hl_lines="1-2 11 13"
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import { Tracer, captureLambdaHandler } from '@aws-lambda-powertools/tracer';
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import middy from '@middy/core'; // (1)
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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const lambdaHandler = async (_event: any, _context: any): Promise<void> => {
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/* ... */
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};
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// Wrap the handler with middy
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export const handler = middy(lambdaHandler)
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// Use the middleware by passing the Tracer instance as a parameter
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.use(captureLambdaHandler(tracer));
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--8<-- "docs/snippets/tracer/middy.ts"
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```
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1. Using Middy for the first time? You can install Middy by running `npm i @middy/core`.
@@ -129,60 +103,15 @@ You can quickly start by importing the `Tracer` class, initialize it outside the
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See the [official TypeScript documentation](https://www.typescriptlang.org/docs/handbook/decorators.html) for more details.
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```typescript hl_lines="8"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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import { LambdaInterface } from '@aws-lambda-powertools/commons';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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class Lambda implements LambdaInterface {
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// Decorate your handler class method
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@tracer.captureLambdaHandler()
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public async handler(_event: any, _context: any): Promise<void> {
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/* ... */
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}
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}
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const handlerClass = new Lambda();
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export const handler = handlerClass.handler.bind(handlerClass); // (1)
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--8<-- "docs/snippets/tracer/decorator.ts"
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```
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1. Binding your handler method allows your handler to access `this`.
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=== "Manual"
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```typescript hl_lines="6 8-9 12-13 19 22 26 28"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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export const handler = async (_event: any, context: any): Promise<unknown> => {
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const segment = tracer.getSegment(); // This is the facade segment (the one that is created by AWS Lambda)
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// Create subsegment for the function & set it as active
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const subsegment = segment.addNewSubsegment(`## ${process.env._HANDLER}`);
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tracer.setSegment(subsegment);
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// Annotate the subsegment with the cold start & serviceName
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tracer.annotateColdStart();
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tracer.addServiceNameAnnotation();
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let res;
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try {
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/* ... */
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// Add the response as metadata
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tracer.addResponseAsMetadata(res, process.env._HANDLER);
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} catch (err) {
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// Add the error as metadata
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tracer.addErrorAsMetadata(err as Error);
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throw err;
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} finally {
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// Close subsegment (the AWS Lambda one is closed automatically)
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subsegment.close();
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// Set back the facade segment as active again
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tracer.setSegment(segment);
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}
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return res;
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};
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--8<-- "docs/snippets/tracer/manual.ts"
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```
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@@ -203,26 +132,13 @@ When using the `captureLambdaHandler` decorator or middleware, Tracer performs t
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You can add annotations using `putAnnotation` method.
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```typescript hl_lines="6"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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export const handler = async (_event: any, _context: any): Promise<void> => {
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tracer.putAnnotation('successfulBooking', true);
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};
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--8<-- "docs/snippets/tracer/putAnnotation.ts"
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```
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=== "Metadata"
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You can add metadata using `putMetadata` method.
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```typescript hl_lines="7"
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import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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export const handler = async (_event: any, _context: any): Promise<void> => {
223-
const res; /* ... */
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tracer.putMetadata('paymentResponse', res);
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};
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--8<-- "docs/snippets/tracer/putMetadata.ts"
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```
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<figure>
@@ -237,26 +153,7 @@ You can trace other Class methods using the `captureMethod` decorator or any arb
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=== "Decorator"
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```typescript hl_lines="8"
240-
import { Tracer } from '@aws-lambda-powertools/tracer';
241-
import { LambdaInterface } from '@aws-lambda-powertools/commons';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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class Lambda implements LambdaInterface {
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// Decorate your class method
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@tracer.captureMethod() // (1)
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public getChargeId(): string {
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/* ... */
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return 'foo bar';
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}
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public async handler(_event: any, _context: any): Promise<void> {
254-
/* ... */
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}
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}
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const handlerClass = new Lambda();
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export const handler = handlerClass.handler.bind(handlerClass); // (2)
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--8<-- "docs/snippets/tracer/captureMethodDecorator.ts"
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```
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1. You can set a custom name for the subsegment by passing `subSegmentName` to the decorator, like: `@tracer.captureMethod({ subSegmentName: '### myCustomMethod' })`.
@@ -265,40 +162,7 @@ You can trace other Class methods using the `captureMethod` decorator or any arb
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=== "Manual"
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```typescript hl_lines="6 8-9 15 18 23 25"
268-
import { Tracer } from '@aws-lambda-powertools/tracer';
269-
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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const getChargeId = async (): Promise<unknown> => {
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const parentSubsegment = tracer.getSegment(); // This is the subsegment currently active
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// Create subsegment for the function & set it as active
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const subsegment = parentSubsegment.addNewSubsegment(`### chargeId`);
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tracer.setSegment(subsegment);
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let res;
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try {
280-
/* ... */
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// Add the response as metadata
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tracer.addResponseAsMetadata(res, 'chargeId');
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} catch (err) {
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// Add the error as metadata
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tracer.addErrorAsMetadata(err as Error);
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throw err;
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}
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// Close subsegment (the AWS Lambda one is closed automatically)
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subsegment.close();
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// Set the facade segment as active again
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tracer.setSegment(parentSubsegment);
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return res;
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};
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export const handler = async (_event: any, _context: any): Promise<void> => {
298-
const chargeId = getChargeId();
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const payment = collectPayment(chargeId);
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/* ... */
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};
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--8<-- "docs/snippets/tracer/captureMethodManual.ts"
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```
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@@ -314,11 +178,7 @@ You can patch any AWS SDK clients by calling the `captureAWSv3Client` method:
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=== "index.ts"
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```typescript hl_lines="5"
317-
import { S3Client } from '@aws-sdk/client-s3';
318-
import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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const client = tracer.captureAWSv3Client(new S3Client({}));
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--8<-- "docs/snippets/tracer/captureAWSv3.ts"
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```
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!!! info
@@ -329,22 +189,15 @@ You can patch all AWS SDK v2 clients by calling the `captureAWS` method:
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=== "index.ts"
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```typescript hl_lines="4"
332-
import { Tracer } from '@aws-lambda-powertools/tracer';
333-
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
335-
const AWS = tracer.captureAWS(require('aws-sdk'));
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--8<-- "docs/snippets/tracer/captureAWSAll.ts"
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```
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If you're looking to shave a few microseconds, or milliseconds depending on your function memory configuration, you can patch only specific AWS SDK v2 clients using `captureAWSClient`:
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=== "index.ts"
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```typescript hl_lines="5"
343-
import { S3 } from 'aws-sdk';
344-
import { Tracer } from '@aws-lambda-powertools/tracer';
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
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const s3 = tracer.captureAWSClient(new S3());
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--8<-- "docs/snippets/tracer/captureAWS.ts"
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```
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### Tracing HTTP requests
@@ -360,14 +213,7 @@ You can opt-out from this feature by setting the **`POWERTOOLS_TRACER_CAPTURE_HT
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=== "index.ts"
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```typescript hl_lines="2 7"
363-
import { Tracer } from '@aws-lambda-powertools/tracer';
364-
import axios from 'axios'; // (1)
365-
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
367-
368-
export const handler = async (event: unknown, context: Context): Promise<void> => {
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await axios.get('https://httpbin.org/status/200');
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};
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--8<-- "docs/snippets/tracer/captureHTTP.ts"
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```
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1. You can install the [axios](https://www.npmjs.com/package/axios) package using `npm i axios`
@@ -418,62 +264,19 @@ Alternatively, use the `captureResponse: false` option in both `tracer.captureLa
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=== "method.ts"
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420266
```typescript hl_lines="6"
421-
import { Tracer } from '@aws-lambda-powertools/tracer';
422-
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
424-
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class Lambda implements LambdaInterface {
426-
@tracer.captureMethod({ captureResult: false })
427-
public getChargeId(): string {
428-
/* ... */
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return 'foo bar';
430-
}
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public async handler(_event: any, _context: any): Promise<void> {
433-
/* ... */
434-
}
435-
}
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const handlerClass = new Lambda();
438-
export const handler = handlerClass.handler.bind(handlerClass);
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--8<-- "docs/snippets/tracer/disableCaptureResponseMethod.ts"
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```
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=== "handler.ts"
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443272
```typescript hl_lines="7"
444-
import { Tracer } from '@aws-lambda-powertools/tracer';
445-
import { LambdaInterface } from '@aws-lambda-powertools/commons';
446-
447-
const tracer = new Tracer({ serviceName: 'serverlessAirline' });
448-
449-
class Lambda implements LambdaInterface {
450-
@tracer.captureLambdaHandler({ captureResponse: false })
451-
async handler(_event: any, _context: any): Promise<void> {
452-
/* ... */
453-
}
454-
}
455-
456-
const handlerClass = new Lambda();
457-
export const handler = handlerClass.handler.bind(handlerClass);
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--8<-- "docs/snippets/tracer/disableCaptureResponseHandler.ts"
458274
```
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460276
=== "middy.ts"
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462278
```typescript hl_lines="14"
463-
import { Tracer, captureLambdaHandler } from '@aws-lambda-powertools/tracer';
464-
import middy from '@middy/core';
465-
466-
const tracer = new Tracer({ serviceName: 'serverlessAirline' });
467-
468-
const lambdaHandler = async (_event: any, _context: any): Promise<void> => {
469-
/* ... */
470-
};
471-
472-
// Wrap the handler with middy
473-
export const handler = middy(lambdaHandler)
474-
// Use the middleware by passing the Tracer instance as a parameter,
475-
// but specify the captureResponse option as false.
476-
.use(captureLambdaHandler(tracer, { captureResponse: false }));
279+
--8<-- "docs/snippets/tracer/disableCaptureResponseMiddy.ts"
477280
```
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### Disabling errors auto-capture
@@ -496,24 +299,7 @@ Tracer exposes a `getRootXrayTraceId()` method that allows you to retrieve the [
496299
=== "index.ts"
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498301
```typescript hl_lines="9"
499-
import { Tracer } from '@aws-lambda-powertools/tracer';
500-
501-
const tracer = new Tracer({ serviceName: 'serverlessAirline' });
502-
503-
export const handler = async (event: unknown, context: Context): Promise<void> => {
504-
try {
505-
...
506-
} catch (err) {
507-
const rootTraceId = tracer.getRootXrayTraceId();
508-
509-
// Example of returning an error response
510-
return {
511-
statusCode: 500,
512-
body: `Internal Error - Please contact support and quote the following id: ${rootTraceId}`,
513-
headers: { '_X_AMZN_TRACE_ID': rootTraceId },
514-
};
515-
}
516-
};
302+
--8<-- "docs/snippets/tracer/accessRootTraceId.ts"
517303
```
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519305
### Escape hatch mechanism
@@ -525,13 +311,7 @@ This is useful when you need a feature available in X-Ray that is not available
525311
=== "index.ts"
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527313
```typescript hl_lines="7"
528-
import { Logger } from '@aws-lambda-powertools/logger';
529-
import { Tracer } from '@aws-lambda-powertools/tracer';
530-
531-
const serviceName = 'serverlessAirline';
532-
const logger = new Logger({ serviceName: serviceName });
533-
const tracer = new Tracer({ serviceName: serviceName });
534-
tracer.provider.setLogger(logger);
314+
--8<-- "docs/snippets/tracer/escapeHatch.ts"
535315
```
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537317
## Testing your code

‎docs/snippets/tracer/accessRootTraceId.ts‎

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@@ -0,0 +1,18 @@
1+
import { Tracer } from '@aws-lambda-powertools/tracer';
2+
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const tracer = new Tracer({ serviceName: 'serverlessAirline' });
4+
5+
export const handler = async (event: unknown, context: Context): Promise<void> => {
6+
try {
7+
8+
} catch (err) {
9+
const rootTraceId = tracer.getRootXrayTraceId();
10+
11+
// Example of returning an error response
12+
return {
13+
statusCode: 500,
14+
body: `Internal Error - Please contact support and quote the following id: ${rootTraceId}`,
15+
headers: { '_X_AMZN_TRACE_ID': rootTraceId },
16+
};
17+
}
18+
};

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