fix in handling states and purging (#33722)

* fix in handling states and purging

* changelog

* increase coverage

* cr fixes

* remove code duplication in tests

(cherry picked from commit 01f9d43)

CHANGELOG.next.asciidoc

@@ -54,6 +54,8 @@ https://github.com/elastic/beats/compare/v8.2.0\...main[Check the HEAD diff]
 
 *Filebeat*
 
+- Fix EOF on single line not producing any event. {issue}30436[30436] {pull}33568[33568]
+- Fix handling of error in states in direct aws-s3 listing input {issue}33513[33513] {pull}33722[33722]
 - Fix `httpjson` input page number initialization and documentation. {pull}33400[33400]
 - Add handling of AAA operations for Cisco ASA module. {issue}32257[32257] {pull}32789[32789]
 - Fix gc.log always shipped even if gc fileset is disabled {issue}30995[30995]

x-pack/filebeat/input/awss3/input_integration_test.go

@@ -31,11 +31,8 @@ import (
 	"golang.org/x/sync/errgroup"
 	"gopkg.in/yaml.v2"
 
-	"github.com/elastic/beats/v7/filebeat/beater"
 	v2 "github.com/elastic/beats/v7/filebeat/input/v2"
 	pubtest "github.com/elastic/beats/v7/libbeat/publisher/testing"
-	"github.com/elastic/beats/v7/libbeat/statestore"
-	"github.com/elastic/beats/v7/libbeat/statestore/storetest"
 	awscommon "github.com/elastic/beats/v7/x-pack/libbeat/common/aws"
 	conf "github.com/elastic/elastic-agent-libs/config"
 	"github.com/elastic/elastic-agent-libs/logp"
@@ -134,28 +131,6 @@ file_selectors:
 `, queueURL))
 }
 
-type testInputStore struct {
-	registry *statestore.Registry
-}
-
-func openTestStatestore() beater.StateStore {
-	return &testInputStore{
-		registry: statestore.NewRegistry(storetest.NewMemoryStoreBackend()),
-	}
-}
-
-func (s *testInputStore) Close() {
-	s.registry.Close()
-}
-
-func (s *testInputStore) Access() (*statestore.Store, error) {
-	return s.registry.Get("filebeat")
-}
-
-func (s *testInputStore) CleanupInterval() time.Duration {
-	return 24 * time.Hour
-}
-
 func createInput(t *testing.T, cfg *conf.C) *s3Input {
 	inputV2, err := Plugin(openTestStatestore()).Manager.Create(cfg)
 	if err != nil {

x-pack/filebeat/input/awss3/s3.go

@@ -208,7 +208,12 @@ func (p *s3Poller) GetS3Objects(ctx context.Context, s3ObjectPayloadChan chan<-
 				continue
 			}
 
-			p.states.Update(state, "")
+			// we have no previous state or the previous state
+			// is not stored: refresh the state
+			previousState := p.states.FindPrevious(state)
+			if previousState.IsEmpty() || !previousState.IsProcessed() {
+				p.states.Update(state, "")
+			}
 
 			event := s3EventV2{}
 			event.AWSRegion = p.region
@@ -282,8 +287,8 @@ func (p *s3Poller) Purge() {
 
 		for _, state := range p.states.GetStatesByListingID(listingID) {
 			// it is not stored, keep
-			if !state.Stored {
-				p.log.Debugw("state not stored, skip purge", "state", state)
+			if !state.IsProcessed() {
+				p.log.Debugw("state not stored or with error, skip purge", "state", state)
 				continue
 			}
 
@@ -294,7 +299,7 @@ func (p *s3Poller) Purge() {
 				var commitWriteState commitWriteState
 				err := p.store.Get(awsS3WriteCommitPrefix+state.Bucket+state.ListPrefix, &commitWriteState)
 				if err == nil {
-					// we have no entry in the map and we have no entry in the store
+					// we have no entry in the map, and we have no entry in the store
 					// set zero time
 					latestStoredTime = time.Time{}
 					p.log.Debugw("last stored time is zero time", "bucket", state.Bucket, "listPrefix", state.ListPrefix)

x-pack/filebeat/input/awss3/state.go

@@ -60,6 +60,11 @@ func (s *state) MarkAsError() {
 	s.Error = true
 }
 
+// IsProcessed checks if the state is either Stored or Error
+func (s *state) IsProcessed() bool {
+	return s.Stored || s.Error
+}
+
 // IsEqual checks if the two states point to the same s3 object.
 func (s *state) IsEqual(c *state) bool {
 	return s.Bucket == c.Bucket && s.Key == c.Key && s.Etag == c.Etag && s.LastModified.Equal(c.LastModified)

x-pack/filebeat/input/awss3/states.go

@@ -78,10 +78,10 @@ func (s *states) MustSkip(state state, store *statestore.Store) bool {
 		return true
 	}
 
-	// we have no previous state or the previous state
-	// is not stored: refresh the state
-	if previousState.IsEmpty() || (!previousState.Stored && !previousState.Error) {
-		s.Update(state, "")
+	// the previous state is stored or has error: let's skip
+	if !previousState.IsEmpty() && previousState.IsProcessed() {
+		s.log.Debugw("previous state is stored or has error", "state", state)
+		return true
 	}
 
 	return false
@@ -166,7 +166,7 @@ func (s *states) Update(newState state, listingID string) {
 		s.log.Debug("New state added for ", newState.ID)
 	}
 
-	if listingID == "" || (!newState.Stored && !newState.Error) {
+	if listingID == "" || !newState.IsProcessed() {
 		return
 	}
 

x-pack/filebeat/input/awss3/states_test.go

@@ -9,76 +9,185 @@ import (
 	"testing"
 	"time"
 
+	"github.com/elastic/beats/v7/filebeat/beater"
+	"github.com/elastic/beats/v7/libbeat/statestore"
+	"github.com/elastic/beats/v7/libbeat/statestore/storetest"
+
 	"github.com/stretchr/testify/assert"
 
 	v2 "github.com/elastic/beats/v7/filebeat/input/v2"
 	"github.com/elastic/elastic-agent-libs/logp"
 )
 
+type testInputStore struct {
+	registry *statestore.Registry
+}
+
+func openTestStatestore() beater.StateStore {
+	return &testInputStore{
+		registry: statestore.NewRegistry(storetest.NewMemoryStoreBackend()),
+	}
+}
+
+func (s *testInputStore) Close() {
+	_ = s.registry.Close()
+}
+
+func (s *testInputStore) Access() (*statestore.Store, error) {
+	return s.registry.Get("filebeat")
+}
+
+func (s *testInputStore) CleanupInterval() time.Duration {
+	return 24 * time.Hour
+}
+
 var inputCtx = v2.Context{
 	Logger:      logp.NewLogger("test"),
 	Cancelation: context.Background(),
 }
 
-func TestStatesIsNew(t *testing.T) {
+func TestStatesIsNewAndMustSkip(t *testing.T) {
 	type stateTestCase struct {
-		states   func() *states
-		state    state
-		expected bool
+		states            func() *states
+		state             state
+		mustBeNew         bool
+		persistentStoreKV map[string]interface{}
+		expectedMustSkip  bool
+		expectedIsNew     bool
 	}
 	lastModified := time.Date(2022, time.June, 30, 14, 13, 00, 0, time.UTC)
 	tests := map[string]stateTestCase{
 		"with empty states": {
 			states: func() *states {
 				return newStates(inputCtx)
 			},
-			state:    newState("bucket", "key", "etag", "listPrefix", lastModified),
-			expected: true,
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified),
+			expectedMustSkip: false,
+			expectedIsNew:    true,
 		},
 		"not existing state": {
 			states: func() *states {
 				states := newStates(inputCtx)
 				states.Update(newState("bucket", "key", "etag", "listPrefix", lastModified), "")
 				return states
 			},
-			state:    newState("bucket1", "key1", "etag1", "listPrefix1", lastModified),
-			expected: true,
+			state:            newState("bucket1", "key1", "etag1", "listPrefix1", lastModified),
+			expectedMustSkip: false,
+			expectedIsNew:    true,
 		},
 		"existing state": {
 			states: func() *states {
 				states := newStates(inputCtx)
 				states.Update(newState("bucket", "key", "etag", "listPrefix", lastModified), "")
 				return states
 			},
-			state:    newState("bucket", "key", "etag", "listPrefix", lastModified),
-			expected: false,
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified),
+			expectedMustSkip: true,
+			expectedIsNew:    false,
 		},
 		"with different etag": {
 			states: func() *states {
 				states := newStates(inputCtx)
 				states.Update(newState("bucket", "key", "etag1", "listPrefix", lastModified), "")
 				return states
 			},
-			state:    newState("bucket", "key", "etag2", "listPrefix", lastModified),
-			expected: true,
+			state:            newState("bucket", "key", "etag2", "listPrefix", lastModified),
+			expectedMustSkip: false,
+			expectedIsNew:    true,
 		},
 		"with different lastmodified": {
 			states: func() *states {
 				states := newStates(inputCtx)
 				states.Update(newState("bucket", "key", "etag", "listPrefix", lastModified), "")
 				return states
 			},
-			state:    newState("bucket", "key", "etag", "listPrefix", lastModified.Add(1*time.Second)),
-			expected: true,
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified.Add(1*time.Second)),
+			expectedMustSkip: false,
+			expectedIsNew:    true,
+		},
+		"with stored state": {
+			states: func() *states {
+				states := newStates(inputCtx)
+				aState := newState("bucket", "key", "etag", "listPrefix", lastModified)
+				aState.Stored = true
+				states.Update(aState, "")
+				return states
+			},
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified),
+			mustBeNew:        true,
+			expectedMustSkip: true,
+			expectedIsNew:    true,
+		},
+		"with error state": {
+			states: func() *states {
+				states := newStates(inputCtx)
+				aState := newState("bucket", "key", "etag", "listPrefix", lastModified)
+				aState.Error = true
+				states.Update(aState, "")
+				return states
+			},
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified),
+			mustBeNew:        true,
+			expectedMustSkip: true,
+			expectedIsNew:    true,
+		},
+		"before commit write": {
+			states: func() *states {
+				return newStates(inputCtx)
+			},
+			persistentStoreKV: map[string]interface{}{
+				awsS3WriteCommitPrefix + "bucket" + "listPrefix": &commitWriteState{lastModified},
+			},
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified.Add(-1*time.Second)),
+			expectedMustSkip: true,
+			expectedIsNew:    true,
+		},
+		"same commit write": {
+			states: func() *states {
+				return newStates(inputCtx)
+			},
+			persistentStoreKV: map[string]interface{}{
+				awsS3WriteCommitPrefix + "bucket" + "listPrefix": &commitWriteState{lastModified},
+			},
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified),
+			expectedMustSkip: true,
+			expectedIsNew:    true,
+		},
+		"after commit write": {
+			states: func() *states {
+				return newStates(inputCtx)
+			},
+			persistentStoreKV: map[string]interface{}{
+				awsS3WriteCommitPrefix + "bucket" + "listPrefix": &commitWriteState{lastModified},
+			},
+			state:            newState("bucket", "key", "etag", "listPrefix", lastModified.Add(time.Second)),
+			expectedMustSkip: false,
+			expectedIsNew:    true,
 		},
 	}
 
 	for name, test := range tests {
 		test := test
 		t.Run(name, func(t *testing.T) {
 			states := test.states()
+			store := openTestStatestore()
+			persistentStore, err := store.Access()
+			if err != nil {
+				t.Fatalf("unexpected err: %v", err)
+			}
+			for key, value := range test.persistentStoreKV {
+				_ = persistentStore.Set(key, value)
+			}
+
+			if test.mustBeNew {
+				test.state.LastModified = test.state.LastModified.Add(1 * time.Second)
+			}
+
 			isNew := states.IsNew(test.state)
-			assert.Equal(t, test.expected, isNew)
+			assert.Equal(t, test.expectedIsNew, isNew)
+
+			mustSkip := states.MustSkip(test.state, persistentStore)
+			assert.Equal(t, test.expectedMustSkip, mustSkip)
 		})
 	}
 }