Support running multiple log groups in cloudwatch input

CHANGELOG.next.asciidoc

@@ -106,6 +106,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix `sophos` KV splitting and syslog header handling {issue}24237[24237] {pull}29331[29331]
 - Undo deletion of endpoint config from cloudtrail fileset in {pull}29415[29415]. {pull}29450[29450]
 - ibmmq: Fixed `@timestamp` not being populated with correct values. {pull}29773[29773]
+- Fix using log_group_name_prefix in aws-cloudwatch input. {pull}29695[29695]
 
 *Heartbeat*
 

x-pack/filebeat/docs/inputs/input-aws-cloudwatch.asciidoc

@@ -50,12 +50,18 @@ log_group_name is given.
 ==== `log_group_name_prefix`
 The prefix for a group of log group names. Note: `region_name` is required when
 log_group_name_prefix is given. `log_group_name` and `log_group_name_prefix`
-cannot be given at the same time.
+cannot be given at the same time. The number of workers that will process the
+log groups under this prefix is set through the `number_of_workers` config.
 
 [float]
 ==== `region_name`
 Region that the specified log group or log group prefix belongs to.
 
+[float]
+==== `number_of_workers`
+Number of workers that will process the log groups with the given `log_group_name_prefix`.
+Default value is 1.
+
 [float]
 ==== `log_streams`
 A list of strings of log streams names that Filebeat collect log events from.

x-pack/filebeat/input/awscloudwatch/_meta/terraform/.gitignore

@@ -0,0 +1,3 @@
+terraform/
+outputs.yml
+*.tfstate*

x-pack/filebeat/input/awscloudwatch/_meta/terraform/README.md

@@ -0,0 +1,46 @@
+# Terraform setup for AWS CloudWatch Input Integration Tests
+
+This directory contains a Terraform module that creates the AWS resources needed
+for executing the integration tests for the `aws-cloudwatch` Filebeat input. It
+creates two CloudWatch log groups, and one log stream under each log group.
+
+It outputs configuration information that is consumed by the tests to
+`outputs.yml`. The AWS resources are randomly named to prevent name collisions
+between multiple users.
+
+### Usage
+
+You must have the appropriate AWS environment variables for authentication set
+before running Terraform or the integration tests. The AWS key must be
+authorized to create and destroy AWS CloudWatch log groups.
+
+1. Initialize a working directory containing Terraform configuration files.
+
+   `terraform init`
+
+2. Execute terraform in this directory to create the resources. This will also
+   write the `outputs.yml`. You can use `export TF_VAR_aws_region=NNNNN` in order
+   to match the AWS region of the profile you are using.
+
+   `terraform apply`
+
+
+2. (Optional) View the output configuration.
+
+   ```yaml
+    "aws_region": "us-east-1"
+    "log_group_name_1": "filebeat-cloudwatch-integtest-1-417koa"
+    "log_group_name_2": "filebeat-cloudwatch-integtest-2-417koa"
+   ```
+
+3. Execute the integration test.
+
+    ```
+    cd x-pack/filebeat/input/awss3
+    go test -tags aws,integration -run TestInputRun.+ -v .
+    ```
+
+4. Cleanup AWS resources. Execute terraform to delete the log groups created for
+testing.
+
+   `terraform destroy`

x-pack/filebeat/input/awscloudwatch/_meta/terraform/main.tf

@@ -0,0 +1,44 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 3.52"
+    }
+  }
+}
+
+provider "aws" {
+  region = var.aws_region
+}
+
+resource "random_string" "random" {
+  length  = 6
+  special = false
+  upper   = false
+}
+
+resource "aws_cloudwatch_log_group" "filebeat-integtest-1" {
+  name = "filebeat-log-group-integtest-1-${random_string.random.result}"
+
+  tags = {
+    Environment = "test"
+  }
+}
+
+resource "aws_cloudwatch_log_group" "filebeat-integtest-2" {
+  name = "filebeat-log-group-integtest-2-${random_string.random.result}"
+
+  tags = {
+    Environment = "test"
+  }
+}
+
+resource "aws_cloudwatch_log_stream" "filebeat-integtest-1" {
+  name           = "filebeat-log-stream-integtest-1-${random_string.random.result}"
+  log_group_name = aws_cloudwatch_log_group.filebeat-integtest-1.name
+}
+
+resource "aws_cloudwatch_log_stream" "filebeat-integtest-2" {
+  name           = "filebeat-log-stream-integtest-2-${random_string.random.result}"
+  log_group_name = aws_cloudwatch_log_group.filebeat-integtest-2.name
+}

x-pack/filebeat/input/awscloudwatch/_meta/terraform/outputs.tf

@@ -0,0 +1,11 @@
+resource "local_file" "secrets" {
+  content = yamlencode({
+    "log_group_name_1" : aws_cloudwatch_log_group.filebeat-integtest-1.name
+    "log_group_name_2" : aws_cloudwatch_log_group.filebeat-integtest-2.name
+    "log_stream_name_1" : aws_cloudwatch_log_stream.filebeat-integtest-1.name
+    "log_stream_name_2" : aws_cloudwatch_log_stream.filebeat-integtest-2.name
+    "aws_region" : var.aws_region
+  })
+  filename        = "${path.module}/outputs.yml"
+  file_permission = "0644"
+}

x-pack/filebeat/input/awscloudwatch/_meta/terraform/variables.tf

@@ -0,0 +1,5 @@
+variable "aws_region" {
+  description = "AWS Region"
+  type        = string
+  default     = "us-east-1"
+}

x-pack/filebeat/input/awscloudwatch/cloudwatch.go

@@ -0,0 +1,125 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package awscloudwatch
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	awssdk "github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs"
+	"github.com/aws/aws-sdk-go-v2/service/cloudwatchlogs/cloudwatchlogsiface"
+	"github.com/pkg/errors"
+
+	"github.com/elastic/beats/v7/libbeat/logp"
+	"github.com/elastic/beats/v7/libbeat/monitoring"
+	"github.com/elastic/beats/v7/libbeat/statestore"
+	awscommon "github.com/elastic/beats/v7/x-pack/libbeat/common/aws"
+)
+
+type cloudwatchPoller struct {
+	numberOfWorkers      int
+	apiSleep             time.Duration
+	region               string
+	logStreams           []string
+	logStreamPrefix      string
+	startTime            int64
+	endTime              int64
+	prevEndTime          int64
+	workerSem            *awscommon.Sem
+	log                  *logp.Logger
+	metrics              *inputMetrics
+	store                *statestore.Store
+	workersListingMap    *sync.Map
+	workersProcessingMap *sync.Map
+}
+
+func newCloudwatchPoller(log *logp.Logger, metrics *inputMetrics,
+	store *statestore.Store,
+	awsRegion string, apiSleep time.Duration,
+	numberOfWorkers int, logStreams []string, logStreamPrefix string) *cloudwatchPoller {
+	if metrics == nil {
+		metrics = newInputMetrics(monitoring.NewRegistry(), "")
+	}
+
+	return &cloudwatchPoller{
+		numberOfWorkers:      numberOfWorkers,
+		apiSleep:             apiSleep,
+		region:               awsRegion,
+		logStreams:           logStreams,
+		logStreamPrefix:      logStreamPrefix,
+		startTime:            int64(0),
+		endTime:              int64(0),
+		workerSem:            awscommon.NewSem(numberOfWorkers),
+		log:                  log,
+		metrics:              metrics,
+		store:                store,
+		workersListingMap:    new(sync.Map),
+		workersProcessingMap: new(sync.Map),
+	}
+}
+
+func (p *cloudwatchPoller) run(svc cloudwatchlogsiface.ClientAPI, logGroup string, startTime int64, endTime int64, logProcessor *logProcessor) {
+	err := p.getLogEventsFromCloudWatch(svc, logGroup, startTime, endTime, logProcessor)
+	if err != nil {
+		var err *awssdk.RequestCanceledError
+		if errors.As(err, &err) {
+			p.log.Error("getLogEventsFromCloudWatch failed with RequestCanceledError: ", err)
+		}
+		p.log.Error("getLogEventsFromCloudWatch failed: ", err)
+	}
+}
+
+// getLogEventsFromCloudWatch uses FilterLogEvents API to collect logs from CloudWatch
+func (p *cloudwatchPoller) getLogEventsFromCloudWatch(svc cloudwatchlogsiface.ClientAPI, logGroup string, startTime int64, endTime int64, logProcessor *logProcessor) error {
+	// construct FilterLogEventsInput
+	filterLogEventsInput := p.constructFilterLogEventsInput(startTime, endTime, logGroup)
+
+	// make API request
+	req := svc.FilterLogEventsRequest(filterLogEventsInput)
+	paginator := cloudwatchlogs.NewFilterLogEventsPaginator(req)
+	for paginator.Next(context.TODO()) {
+		page := paginator.CurrentPage()
+		p.metrics.apiCallsTotal.Inc()
+
+		logEvents := page.Events
+		p.metrics.logEventsReceivedTotal.Add(uint64(len(logEvents)))
+		p.log.Debugf("Processing #%v events", len(logEvents))
+		err := logProcessor.processLogEvents(logEvents, logGroup, p.region)
+		if err != nil {
+			err = errors.Wrap(err, "processLogEvents failed")
+			p.log.Error(err)
+		}
+	}
+
+	if err := paginator.Err(); err != nil {
+		return errors.Wrap(err, "error FilterLogEvents with Paginator")
+	}
+
+	// This sleep is to avoid hitting the FilterLogEvents API limit(5 transactions per second (TPS)/account/Region).
+	p.log.Debugf("sleeping for %v before making FilterLogEvents API call again", p.apiSleep)
+	time.Sleep(p.apiSleep)
+	p.log.Debug("done sleeping")
+	return nil
+}
+
+func (p *cloudwatchPoller) constructFilterLogEventsInput(startTime int64, endTime int64, logGroup string) *cloudwatchlogs.FilterLogEventsInput {
+	filterLogEventsInput := &cloudwatchlogs.FilterLogEventsInput{
+		LogGroupName: awssdk.String(logGroup),
+		StartTime:    awssdk.Int64(startTime),
+		EndTime:      awssdk.Int64(endTime),
+		Limit:        awssdk.Int64(100),
+	}
+
+	if len(p.logStreams) > 0 {
+		filterLogEventsInput.LogStreamNames = p.logStreams
+	}
+
+	if p.logStreamPrefix != "" {
+		filterLogEventsInput.LogStreamNamePrefix = awssdk.String(p.logStreamPrefix)
+	}
+	return filterLogEventsInput
+}

x-pack/filebeat/input/awscloudwatch/config.go

@@ -25,18 +25,20 @@ type config struct {
 	APITimeout                time.Duration       `config:"api_timeout" validate:"min=0,nonzero"`
 	APISleep                  time.Duration       `config:"api_sleep" validate:"min=0,nonzero"`
 	Latency                   time.Duration       `config:"latency"`
-	AwsConfig                 awscommon.ConfigAWS `config:",inline"`
+	NumberOfWorkers           int                 `config:"number_of_workers"`
+	AWSConfig                 awscommon.ConfigAWS `config:",inline"`
 }
 
 func defaultConfig() config {
 	return config{
 		ForwarderConfig: harvester.ForwarderConfig{
 			Type: "aws-cloudwatch",
 		},
-		StartPosition: "beginning",
-		ScanFrequency: 10 * time.Second,
-		APITimeout:    120 * time.Second,
-		APISleep:      200 * time.Millisecond, // FilterLogEvents has a limit of 5 transactions per second (TPS)/account/Region: 1s / 5 = 200 ms
+		StartPosition:   "beginning",
+		ScanFrequency:   10 * time.Second,
+		APITimeout:      120 * time.Second,
+		APISleep:        200 * time.Millisecond, // FilterLogEvents has a limit of 5 transactions per second (TPS)/account/Region: 1s / 5 = 200 ms
+		NumberOfWorkers: 1,
 	}
 }