[Filebeat] Add max_number_of_messages config parameter for S3 input

CHANGELOG.next.asciidoc

@@ -632,6 +632,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Adding support for Microsoft 365 Defender (Microsoft Threat Protection) {pull}21446[21446]
 - Adding support for FIPS in s3 input {pull}21446[21446]
 - Add SSL option to checkpoint module {pull}19560[19560]
+- Add max_number_of_messages config into s3 input. {pull}21993[21993]
 
 *Heartbeat*
 

x-pack/filebeat/docs/inputs/input-aws-s3.asciidoc

@@ -38,24 +38,32 @@ The `s3` input supports the following configuration options plus the
 <<{beatname_lc}-input-{type}-common-options>> described later.
 
 [float]
-==== `queue_url`
-
-URL of the AWS SQS queue that messages will be received from. Required.
-
-[float]
-==== `fips_enabled`
-
-Enabling this option changes the service name from `s3` to `s3-fips` for connecting to the correct service endpoint. For example: `s3-fips.us-gov-east-1.amazonaws.com`.
+==== `api_timeout`
 
-[float]
-==== `visibility_timeout`
+The maximum duration of the AWS API call. If it exceeds the timeout, the AWS API
+call will be interrupted.
+The default AWS API call timeout for a message is 120 seconds. The minimum
+is 0 seconds. The maximum is half of the visibility timeout value.
 
-The duration that the received messages are hidden from subsequent
-retrieve requests after being retrieved by a ReceiveMessage request.
-This value needs to be a lot bigger than {beatname_uc} collection frequency so
-if it took too long to read the s3 log, this sqs message will not be reprocessed.
-The default visibility timeout for a message is 300 seconds. The minimum
-is 0 seconds. The maximum is 12 hours.
+["source","json"]
+----
+{
+    "Records": [
+        {
+            "eventVersion": "1.07",
+            "eventTime": "2019-11-14T00:51:00Z",
+            "awsRegion": "us-east-1",
+            "eventID": "EXAMPLE8-9621-4d00-b913-beca2EXAMPLE",
+        },
+        {
+            "eventVersion": "1.07",
+            "eventTime": "2019-11-14T00:52:00Z",
+            "awsRegion": "us-east-1",
+            "eventID": "EXAMPLEc-28be-486c-8928-49ce6EXAMPLE",
+        }
+    ]
+}
+----
 
 [float]
 ==== `expand_event_list_from_field`
@@ -93,40 +101,33 @@ file_selectors:
   - regex: '^AWSLogs/\d+/CloudTrail/'
     expand_event_list_from_field: 'Records'
   - regex: '^AWSLogs/\d+/CloudTrail-Digest'
-```
 ----
 
+[float]
+==== `fips_enabled`
+
+Enabling this option changes the service name from `s3` to `s3-fips` for connecting to the correct service endpoint. For example: `s3-fips.us-gov-east-1.amazonaws.com`.
 
 [float]
-==== `api_timeout`
+==== `max_number_of_messages`
+The maximum number of messages to return. Amazon SQS never returns more messages
+than this value (however, fewer messages might be returned).
+Valid values: 1 to 10. Default: 5.
 
-The maximum duration of AWS API can take. If it exceeds the timeout, AWS API
-will be interrupted.
-The default AWS API timeout for a message is 120 seconds. The minimum
-is 0 seconds. The maximum is half of the visibility timeout value.
+[float]
+==== `queue_url`
 
-["source","json"]
-----
-{
-    "Records": [
-        {
-            "eventVersion": "1.07",
-            "eventTime": "2019-11-14T00:51:00Z",
-            "awsRegion": "us-east-1",
-            "eventID": "EXAMPLE8-9621-4d00-b913-beca2EXAMPLE",
-            ...
-        },
-        {
-            "eventVersion": "1.07",
-            "eventTime": "2019-11-14T00:52:00Z",
-            "awsRegion": "us-east-1",
-            "eventID": "EXAMPLEc-28be-486c-8928-49ce6EXAMPLE",
-            ...
-        }
-    ]
-}
-```
-----
+URL of the AWS SQS queue that messages will be received from. Required.
+
+[float]
+==== `visibility_timeout`
+
+The duration that the received messages are hidden from subsequent
+retrieve requests after being retrieved by a ReceiveMessage request.
+This value needs to be a lot bigger than {beatname_uc} collection frequency so
+if it took too long to read the s3 log, this sqs message will not be reprocessed.
+The default visibility timeout for a message is 300 seconds. The minimum
+is 0 seconds. The maximum is 12 hours.
 
 [float]
 ==== `aws credentials`

x-pack/filebeat/input/s3/collector.go

@@ -82,17 +82,11 @@ type s3Context struct {
 	errC chan error
 }
 
-var (
-	// The maximum number of messages to return. Amazon SQS never returns more messages
-	// than this value (however, fewer messages might be returned).
-	maxNumberOfMessage uint8 = 10
-
-	// The duration (in seconds) for which the call waits for a message to arrive
-	// in the queue before returning. If a message is available, the call returns
-	// sooner than WaitTimeSeconds. If no messages are available and the wait time
-	// expires, the call returns successfully with an empty list of messages.
-	waitTimeSecond uint8 = 10
-)
+// The duration (in seconds) for which the call waits for a message to arrive
+// in the queue before returning. If a message is available, the call returns
+// sooner than WaitTimeSeconds. If no messages are available and the wait time
+// expires, the call returns successfully with an empty list of messages.
+var waitTimeSecond uint8 = 10
 
 func (c *s3Collector) run() {
 	defer c.logger.Info("s3 input worker has stopped.")
@@ -205,7 +199,7 @@ func (c *s3Collector) receiveMessage(svcSQS sqsiface.ClientAPI, visibilityTimeou
 		&sqs.ReceiveMessageInput{
 			QueueUrl:              &c.config.QueueURL,
 			MessageAttributeNames: []string{"All"},
-			MaxNumberOfMessages:   awssdk.Int64(int64(maxNumberOfMessage)),
+			MaxNumberOfMessages:   awssdk.Int64(int64(c.config.MaxNumberOfMessages)),
 			VisibilityTimeout:     &visibilityTimeout,
 			WaitTimeSeconds:       awssdk.Int64(int64(waitTimeSecond)),
 		})

x-pack/filebeat/input/s3/config.go

@@ -13,13 +13,14 @@ import (
 )
 
 type config struct {
+	APITimeout               time.Duration       `config:"api_timeout"`
+	ExpandEventListFromField string              `config:"expand_event_list_from_field"`
+	FileSelectors            []FileSelectorCfg   `config:"file_selectors"`
+	FipsEnabled              bool                `config:"fips_enabled"`
+	MaxNumberOfMessages      int                 `config:"max_number_of_messages"`
 	QueueURL                 string              `config:"queue_url" validate:"nonzero,required"`
 	VisibilityTimeout        time.Duration       `config:"visibility_timeout"`
-	FipsEnabled              bool                `config:"fips_enabled"`
 	AwsConfig                awscommon.ConfigAWS `config:",inline"`
-	ExpandEventListFromField string              `config:"expand_event_list_from_field"`
-	APITimeout               time.Duration       `config:"api_timeout"`
-	FileSelectors            []FileSelectorCfg   `config:"file_selectors"`
 }
 
 // FileSelectorCfg defines type and configuration of FileSelectors
@@ -31,9 +32,10 @@ type FileSelectorCfg struct {
 
 func defaultConfig() config {
 	return config{
-		VisibilityTimeout: 300 * time.Second,
-		APITimeout:        120 * time.Second,
-		FipsEnabled:       false,
+		APITimeout:          120 * time.Second,
+		FipsEnabled:         false,
+		MaxNumberOfMessages: 5,
+		VisibilityTimeout:   300 * time.Second,
 	}
 }
 
@@ -42,16 +44,22 @@ func (c *config) Validate() error {
 		return fmt.Errorf("visibility timeout %v is not within the "+
 			"required range 0s to 12h", c.VisibilityTimeout)
 	}
+
 	if c.APITimeout < 0 || c.APITimeout > c.VisibilityTimeout/2 {
 		return fmt.Errorf("api timeout %v needs to be larger than"+
 			" 0s and smaller than half of the visibility timeout", c.APITimeout)
 	}
+
 	for i := range c.FileSelectors {
 		r, err := regexp.Compile(c.FileSelectors[i].RegexString)
 		if err != nil {
 			return err
 		}
 		c.FileSelectors[i].Regex = r
 	}
+
+	if c.MaxNumberOfMessages > 10 || c.MaxNumberOfMessages < 1 {
+		return fmt.Errorf(" max_number_of_messages %v needs to be between 1 and 10", c.MaxNumberOfMessages)
+	}
 	return nil
 }

x-pack/filebeat/input/s3/input.go

@@ -106,7 +106,7 @@ func (in *s3Input) createCollector(ctx v2.Context, pipeline beat.Pipeline) (*s3C
 	}
 
 	log.Debug("s3 service name = ", s3Servicename)
-
+	log.Debug("s3 input config max_number_of_messages = ", in.config.MaxNumberOfMessages)
 	return &s3Collector{
 		cancellation:      ctxtool.FromCanceller(ctx.Cancelation),
 		logger:            log,