3.1091.0 • Published 17h ago

@aws-sdk/client-cloudwatch-logs

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Apache-2.0

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3.1091.0

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2.0 MB

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Summary Dependency Versions

@aws-sdk/client-cloudwatch-logs

Description

AWS SDK for JavaScript CloudWatchLogs Client for Node.js, Browser and React Native.

You can use Amazon CloudWatch Logs to monitor, store, and access your log files from EC2 instances, CloudTrail, and other sources. You can then retrieve the associated log data from CloudWatch Logs using the CloudWatch console. Alternatively, you can use CloudWatch Logs commands in the Amazon Web Services CLI, CloudWatch Logs API, or CloudWatch Logs SDK.

For more information about CloudWatch Logs features, see the Amazon CloudWatch Logs User Guide.

You can use CloudWatch Logs to:

Monitor logs from EC2 instances in real time: You can use CloudWatch Logs to monitor applications and systems using log data. For example, CloudWatch Logs can track the number of errors that occur in your application logs. Then, it can send you a notification whenever the rate of errors exceeds a threshold that you specify. CloudWatch Logs uses your log data for monitoring so no code changes are required. For example, you can monitor application logs for specific literal terms (such as "NullReferenceException"). You can also count the number of occurrences of a literal term at a particular position in log data (such as "404" status codes in an Apache access log). When the term you are searching for is found, CloudWatch Logs reports the data to a CloudWatch metric that you specify.
Monitor CloudTrail logged events: You can create alarms in CloudWatch and receive notifications of particular API activity as captured by CloudTrail. You can use the notification to perform troubleshooting.
Archive log data: You can use CloudWatch Logs to store your log data in highly durable storage. You can change the log retention setting so that any log events earlier than this setting are automatically deleted. The CloudWatch Logs agent helps to quickly send both rotated and non-rotated log data off of a host and into the log service. You can then access the raw log data when you need it.

CloudWatch Logs might log request contents for fields that aren't considered sensitive, such as API request parameters for CloudWatch Logs actions. This provides debugging information for failed API requests.

Installing

To install this package, use the CLI of your favorite package manager:

npm install @aws-sdk/client-cloudwatch-logs
yarn add @aws-sdk/client-cloudwatch-logs
pnpm add @aws-sdk/client-cloudwatch-logs

Getting Started

Import

The AWS SDK is modulized by clients and commands. To send a request, you only need to import the CloudWatchLogsClient and the commands you need, for example ListAnomaliesCommand:

// ES5 example
const { CloudWatchLogsClient, ListAnomaliesCommand } = require("@aws-sdk/client-cloudwatch-logs");

// ES6+ example
import { CloudWatchLogsClient, ListAnomaliesCommand } from "@aws-sdk/client-cloudwatch-logs";

Usage

To send a request:

Instantiate a client with configuration (e.g. credentials, region).
- See docs/CLIENTS for configuration details.
- See @aws-sdk/config for additional options.
Instantiate a command with input parameters.
Call the send operation on the client, providing the command object as input.

const client = new CloudWatchLogsClient({ region: "REGION" });

const params = { /** input parameters */ };
const command = new ListAnomaliesCommand(params);

Async/await

We recommend using the await operator to wait for the promise returned by send operation as follows:

// async/await.
try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  // error handling.
} finally {
  // finally.
}

Promises

You can also use Promise chaining.

client
  .send(command)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  })
  .finally(() => {
    // finally.
  });

Aggregated client

The aggregated client class is exported from the same package, but without the "Client" suffix.

CloudWatchLogs extends CloudWatchLogsClient and additionally supports all operations, waiters, and paginators as methods. This style may be familiar to you from the AWS SDK for JavaScript v2.

If you are bundling the AWS SDK, we recommend using only the bare-bones client (CloudWatchLogsClient). More details are in the blog post on modular packages in AWS SDK for JavaScript.

import { CloudWatchLogs } from "@aws-sdk/client-cloudwatch-logs";

const client = new CloudWatchLogs({ region: "REGION" });

// async/await.
try {
  const data = await client.listAnomalies(params);
  // process data.
} catch (error) {
  // error handling.
}

// Promises.
client
  .listAnomalies(params)
  .then((data) => {
    // process data.
  })
  .catch((error) => {
    // error handling.
  });

// callbacks (not recommended).
client.listAnomalies(params, (err, data) => {
  // process err and data.
});

Troubleshooting

When the service returns an exception, the error will include the exception information, as well as response metadata (e.g. request id).

try {
  const data = await client.send(command);
  // process data.
} catch (error) {
  const { requestId, cfId, extendedRequestId } = error.$metadata;
  console.log({ requestId, cfId, extendedRequestId });
  /**
   * The keys within exceptions are also parsed.
   * You can access them by specifying exception names:
   * if (error.name === 'SomeServiceException') {
   *     const value = error.specialKeyInException;
   * }
   */
}

Getting Help

Please use these community resources for getting help. We use GitHub issues for tracking bugs and feature requests, but have limited bandwidth to address them.

Visit the Developer Guide or API Reference.
Check out the blog posts tagged with aws-sdk-js on AWS Developer Blog.
Ask a question on StackOverflow and tag it with aws-sdk-js.
Join the AWS JavaScript community on gitter.
If it turns out that you may have found a bug, please open an issue.

To test your universal JavaScript code in Node.js, browser and react-native environments, visit our code samples repo.

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