Event replay and cleanup

internal/activity/activity.go

@@ -0,0 +1,106 @@
+package activity
+
+import (
+	"errors"
+	"sync"
+	"time"
+
+	"gitlab.com/whom/bingobot/internal/config"
+	"gitlab.com/whom/bingobot/internal/state"
+	"gitlab.com/whom/bingobot/internal/logging"
+)
+
+/* Activity module
+ * This module sits and processes incoming
+ */
+
+const (
+	ActivityModuleStartFail = "failed to start activity module"
+)
+
+var currentUserActivity map[string][]state.UserActiveEvent
+var userActivityLock sync.RWMutex
+
+func Start() error {
+	ch, err := state.UserActive.Subscribe()
+	if err != nil {
+		return errors.Join(
+			errors.New(ActivityModuleStartFail),
+			err,
+		)
+	}
+
+	// process incoming events loop
+	go func() {
+		for {
+			ev := <- ch
+			emap := ev.Data()
+			user := emap[state.UserEventUserKey]
+			etime := ev.Time()
+			delta := time.Since(etime).Hours() / float64(24)
+
+			if delta <= float64(config.Get().UserEventLifespanDays) {
+				new := []state.UserActiveEvent{ev.(state.UserActiveEvent)}
+				userActivityLock.Lock()
+				current, found := currentUserActivity[user]
+				if found {
+					new = append(new, current...)
+				}
+				userActivityLock.Unlock()
+			} else {
+				logging.Warn("recieved expired useractive event")
+			}
+		}
+	}()
+
+	// process expired events loop
+	go func() {
+		for {
+			delta := time.Hour * 24
+			delta *= time.Duration(config.Get().UserEventLifespanDays)
+			tcur := time.Now().Add(delta)
+
+			// get next soonest expiration
+			userActivityLock.RLock()
+			for _, evs := range currentUserActivity {
+				for _, ev := range evs {
+					hrs := time.Duration(24 * config.Get().UserEventLifespanDays)
+					t := ev.Time().Add(time.Hour * hrs)
+					if t.Before(tcur) {
+						tcur = t
+					}
+				}
+			}
+			userActivityLock.RUnlock()
+			time.Sleep(tcur.Sub(time.Now()))
+
+			userActivityLock.Lock()
+			for k, v := range currentUserActivity {
+				new := []state.UserActiveEvent{}
+				for _, ev := range v {
+					if !ev.Disposable() {
+						new = append(new, ev)
+					}
+				}
+				currentUserActivity[k] = new
+			}
+			userActivityLock.Unlock()
+		}
+	}()
+
+	return nil
+}
+
+func GetActivitySnapshot() map[string][]state.UserActiveEvent {
+	userActivityLock.RLock()
+	defer userActivityLock.RUnlock()
+
+	snapshot := make(map[string][]state.UserActiveEvent)
+	for k, v := range currentUserActivity {
+		newSl := make([]state.UserActiveEvent, len(v))
+		copy(newSl, v)
+		snapshot[k] = newSl
+	}
+
+	return snapshot
+}

internal/config/config.go

@@ -17,22 +17,17 @@ type AppConfig struct {
 	LogCompression bool   `yaml:"log_compression"`
 	LogAddSource   bool   `yaml:"log_add_source"`
 
-	/*
-		how long (in seconds) a user needs to be in vc in order to generate a
-		UserActive event
+	/* how long (in seconds) a user needs to be in vc in order to generate a
+	 * UserActive event
 	 */
 	VoiceActivityThresholdSeconds int `yaml:"voice_activity_threshold_seconds"`
 
-	/*
-		how long (in milliseconds) a voice activity timer sleeps at a time between
-		context cancellation checks.
-
-		a higher value means the function sleeps longer which could be
-		useful for some reason in the future
-
-		a higher value also means that the timer could take longer to cancel.
-
-		current recommended value is 1000ms.
+	/* how long (in milliseconds) a voice activity timer sleeps at a time between
+	 * context cancellation checks.
+	 * a higher value means the function sleeps longer which could be
+	 * useful for some reason in the future
+	 * a higher value also means that the timer could take longer to cancel.
+	 * current recommended value is 1000ms.
 	 */
 	VoiceActivityTimerSleepIntervalMillis int `yaml:"voice_activity_timer_sleep_interval_millis"`
 
@@ -40,7 +35,16 @@ type AppConfig struct {
 	PersistentCacheStore string `yaml:"persistent_cache_store"`
 
 	/* number of internal state events to cache in memory */
-	InMemoryEventCacheSize int `yaml:"InMemoryEventCacheSize"`
+	InMemoryEventCacheSize int `yaml:"in_memory_event_cache_size"`
+	
+	/* number of days a useractive event is valid for
+	 * increasing this will have a bell curve effect on
+	 * voting weights
+	 */
+	UserEventLifespanDays int `yaml:"user_event_lifespan_days"`
+
+	/* listen address for local http Server */
+	LocalWebEndpointListen string `yaml:"local_web_endpoint_listen"`
 }
 
 var config *AppConfig
@@ -110,4 +114,6 @@ func setDefaults() {
 	viper.SetDefault("VoiceActivityTimerSleepIntervalMillis", 1000)
 	viper.SetDefault("PersistentCacheStore", "/tmp/bingobot")
 	viper.SetDefault("InMemoryEventCacheSize", 512)
+	viper.SetDefault("UserEventLifespanDays", 10)
+	viper.SetDefault("LocalWebEndpointListen", ":8080")
 }

internal/state/events.go

@@ -2,9 +2,10 @@ package state
 
 import (
 	"errors"
-	"time"
 	"fmt"
+	"time"
 
+	"gitlab.com/whom/bingobot/internal/config"
 	"gitlab.com/whom/bingobot/internal/logging"
 )
 
@@ -102,6 +103,12 @@ func (ve VoteEvent) Validate() error {
 	return nil
 }
 
+func (ve VoteEvent) Disposable() bool {
+	// will be implemented with democracy module
+	logging.Warn("unimplemented: VoteEvent::Disposable")
+	return false
+}
+
 type UserEvent struct {
 	uid     string
 	created time.Time
@@ -129,6 +136,13 @@ func (ue UserEvent) Validate() error {
 	return nil
 }
 
+func (ue UserEvent) Disposable() bool {
+	// when I make a module for challenges, restorations, and UserActives
+	// then I should implement this 
+	logging.Warn("unimplemented: UserEvent::Disposable")
+	return false
+}
+
 type ChallengeEvent struct {
 	UserEvent
 }
@@ -167,9 +181,48 @@ func (ua UserActiveEvent) Type() EventType {
 	return UserActive
 }
 
+func (ua UserActiveEvent) Disposable() bool {
+	return (time.Since(ua.created).Hours() / 24) >= float64(config.Get().UserEventLifespanDays)
+}
+
 func NewUserActiveEvent(user string) UserActiveEvent {
 	return UserActiveEvent{UserEvent{
 		uid:     user,
 		created: time.Now(),
 	}}
 }
+
+const (
+	TestEventDisposeKey = "dispose"
+	TestEventIDKey      = "id"
+)
+
+type TestEvent struct {
+	Dispose bool
+	ID      int
+}
+
+func (te TestEvent) Type() EventType {
+	return Test
+}
+
+func (te TestEvent) Time() time.Time {
+	return time.Now()
+}
+
+func (te TestEvent) Data() map[string]string {
+	m := map[string]string{}
+	if te.Dispose {
+		m[TestEventDisposeKey] = "t"
+	}
+	m[TestEventIDKey] = fmt.Sprintf("%d", te.ID)
+	return m
+}
+
+func (te TestEvent) Validate() error {
+	return nil
+}
+
+func (te TestEvent) Disposable() bool {
+	return te.Dispose
+}

internal/state/state.go

@@ -1,6 +1,6 @@
 package state
 
-/* STATE
+/* State module
  * This package encapsulates various state information
  * state is represented in various global singletons
  * Additionally, this package offers a pub/sub interface
@@ -8,15 +8,15 @@ package state
  */
 
 import (
-	"fmt"
+	"encoding/json"
+	"errors"
+	"os"
+	"strconv"
 	"sync"
 	"time"
-	"os"
-	"errors"
-	"encoding/json"
 
-	"gitlab.com/whom/bingobot/pkg/docbuf"
 	"gitlab.com/whom/bingobot/internal/logging"
+	"gitlab.com/whom/bingobot/pkg/docbuf"
 )
 
 /* Event interface is meant to encapsulate a general interface
@@ -36,14 +36,17 @@ const (
 	BadChallengeEvent          = "failed to make Challenge Event"
 	BadRestorationEvent        = "failed to make Restoration Event"
 	BadUserActiveEvent         = "failed to make UserActive Event"
+	BadTestEvent               = "failed to make Test Event"
 	BadEventObjMarshal         = "error marshalling event"
 	BadEventObjUnmarshal       = "failed to unmarshal event map"
 	BadEventUnmarshal          = "failed to unmarshal event"
 	BadEventMissingTypeKey     = "event map missing type key"
-)
+	StartBeforeInitError       = "state machine not initialized"
+	ReopenStoreFileError       = "failed to reopen store file"
 
-const (
 	EventTypeMapKey            = "type"
+
+	TmpDocBufBackingFile       = "bingobot_events_processing"
 )
 
 var eventMutex sync.RWMutex
@@ -60,7 +63,7 @@ func Init(eventMemCacheSize int, eventStoreFileName string) error {
 	}
 
 	if eventStream, err = docbuf.NewDocumentBuffer(
-		eventMemCacheSize,
+		0, // temporary nil-cache buffer to replay events from
 		file,
 	); err != nil {
 		return errors.Join(errors.New(BadEventStreamInit), err)
@@ -71,6 +74,89 @@ func Init(eventMemCacheSize int, eventStoreFileName string) error {
 	return nil
 }
 
+// replay events and begin state machine
+func Start() error {
+	if eventStream == nil {
+		return errors.New(StartBeforeInitError)
+	}
+
+	tmpBackFile, err := os.CreateTemp("", TmpDocBufBackingFile)
+	if err != nil {
+		return err
+	}
+
+	tmpBuf, err := docbuf.NewDocumentBuffer(0, tmpBackFile)
+	if err != nil {
+		tmpBackFile.Close()
+		return err
+	}
+
+	// filter out disposable events into a reverse ordered on disk stack
+	var doc string
+	for err == nil || err.Error() != docbuf.PopFromEmptyBufferError {
+		doc, err = eventStream.Pop()
+		if err != nil && err.Error() != docbuf.PopFromEmptyBufferError {
+			return err
+		}
+
+		if doc == "" || 
+		   (err != nil && err.Error() == docbuf.PopFromEmptyBufferError) {
+			break
+		}
+
+		ev, err := EventFromString(doc)
+		if err != nil {
+			logging.Warn("Discarding the following event for not unmarshaling: %s", doc)
+			continue
+		}
+
+		if !ev.Disposable() {
+			tmpBuf.Push(doc)
+		}
+	}
+
+	if err := os.Truncate(eventStorageFileName, 0); err != nil {
+		return errors.Join(errors.New(ReopenStoreFileError), err)
+	}
+
+	file, err := os.OpenFile(eventStorageFileName, os.O_CREATE|os.O_RDWR, 0644)
+	if err != nil {
+		return errors.Join(errors.New(BadEventStoreFilename), err)
+	}
+
+	eventStream, err = docbuf.NewDocumentBuffer(maxEventsInMemory, file)
+	if err != nil {
+		// return error here will panic without truncating or writing to the file
+		return err
+	}
+
+	// unravel tmp stack into properly ordered properly allocated buffer
+	for err == nil || err.Error() != docbuf.PopFromEmptyBufferError {
+		doc, err := tmpBuf.Pop()
+		if err != nil && err.Error() != docbuf.PopFromEmptyBufferError {
+			logging.Warn("Could not handle the following error: %s", err.Error())
+			continue
+		}
+
+		if doc == "" || 
+		   (err != nil && err.Error() == docbuf.PopFromEmptyBufferError) {
+			break
+		}
+
+		ev, err := EventFromString(doc)
+		if err != nil {
+			logging.Warn("Could not handle the following error: %s", err.Error())
+			continue
+		}
+
+		if err := PublishEvent(ev); err != nil {
+			logging.Warn("Could not handle the following error: %s", err.Error())
+		}
+	}
+
+	return nil
+}
+
 // return no error. we are handling SIGINT
 func Teardown() {
 	// riskily ignore all locking....
@@ -96,6 +182,7 @@ const (
 	Challenge
 	Restoration
 	UserActive
+	Test
 	// ...
 
 	// leave this last
@@ -113,6 +200,8 @@ func EventTypeFromString(doc string) EventType {
 		return Restoration
 	case "UserActive":
 		return UserActive
+	case "Test":
+		return Test
 	default:
 		// error case
 		return NumEventTypes
@@ -125,6 +214,7 @@ func (et EventType) String() string {
 		"Challenge",
 		"Restoration",
 		"UserActive",
+		"Test",
 	}
 
 	if et < 0 || et >= NumEventTypes {
@@ -194,6 +284,22 @@ func (et EventType) MakeEvent(data map[string]string) (Event, error) {
 			return nil, errors.Join(errors.New(BadUserActiveEvent), err)
 		}
 		return UserActiveEvent{*e}, nil
+	case Test:
+		disp := false
+		if v, ok := data[TestEventDisposeKey]; ok && v == "t" {
+			disp = true
+		}
+		id := -1
+		if v, ok := data[TestEventIDKey]; ok {
+			var err error
+			if id, err = strconv.Atoi(v); err != nil {
+				return nil, errors.Join(errors.New(BadTestEvent), err)
+			}
+		}
+		return TestEvent{
+			Dispose: disp,
+			ID:      id,
+		}, nil
 	default:
 		return nil, errors.New(BadEventTypeError)
 	}
@@ -232,6 +338,9 @@ type Event interface {
 
 	// validates state of internal metadata per EventType
 	Validate() error
+
+	// returns true if event can be discarded
+	Disposable() bool
 }
 
 func EventToString(e Event) (string, error) {
@@ -283,7 +392,7 @@ func PublishEvent(e Event) error {
 	blocking := false
 
 	for _, c := range eventSubscriptionCache[e.Type()] {
-		if float32(len(c)) > (float32(maxEventsInMemory) * 0.25) {
+		if float32(len(c)) > (float32(maxEventsInMemory) * 0.75) {
 			if len(c) == maxEventsInMemory {
 				logging.Warn(
 					"PublishEvent() blocking -- event channel full",
@@ -373,8 +482,6 @@ func GetMatchingEvents(
 	}
 
 	filter := func(e Event) bool {
-		ev, er := EventToString(e)
-		fmt.Printf("Checking: %s (%e)\n", ev, er)
 		if e.Type() != t {
 			return true
 		}
@@ -385,7 +492,6 @@ func GetMatchingEvents(
 			}
 		}
 
-		fmt.Println("Found Match")
 		matches = append(matches, e)
 		return true
 	}

internal/state/state_test.go

@@ -2,11 +2,12 @@ package state
 
 import (
 	"fmt"
+	"os"
 	"testing"
 	"time"
 
-	"gitlab.com/whom/bingobot/pkg/docbuf"
 	"gitlab.com/whom/bingobot/internal/logging"
+	"gitlab.com/whom/bingobot/pkg/docbuf"
 )
 
 /* WARNING:
@@ -54,15 +55,11 @@ func TestEventMarshalUnmarshal(t *testing.T) {
 		t.Fatalf("error marshalling challenge: %e, %s", err, cstr)
 	}
 
-	t.Logf("cstr: %s\n", cstr)
-
 	vstr, err := EventToString(vev);
 	if err != nil {
 		t.Fatalf("error marshalling vote: %e, %s", err, vstr)
 	}
 
-	t.Logf("vstr: %s\n", vstr)
-
 	if ev, err := EventFromString(cstr); err != nil ||
 	   ev.Data()[UserEventUserKey] != cev.Data()[UserEventUserKey] ||
 	   ev.Data()[UserEventCreatedKey] != cev.Data()[UserEventCreatedKey] {
@@ -270,3 +267,81 @@ func TestVoteEventValidations(t *testing.T) {
 		t.Errorf("Unexpected or no error: %e", err)
 	}
 }
+
+func TestEventReplay(t *testing.T) {
+	tmpTestFile, err := os.CreateTemp("", "TestEventReplayBackingStore")
+	if err != nil {
+		t.Fatalf("failed setting up tempfile: %s", err.Error())
+	}
+
+	if err := tmpTestFile.Close(); err != nil {
+		t.Fatalf("failed to close initial handle to tempfile: %s", err.Error())
+	}
+
+	if err := Init(2, tmpTestFile.Name()); err != nil {
+		t.Fatalf("failed initializing state machine: %s", err.Error())
+	}
+
+	if err := PublishEvent(TestEvent{
+		ID: 1,
+		Dispose: true,
+	}); err != nil {
+		t.Fatalf("failed to publish event 1: %s", err.Error())
+	}
+
+	if err := PublishEvent(TestEvent{
+		ID: 2,
+		Dispose: false,
+	}); err != nil {
+		t.Fatalf("failed to publish event 2: %s", err.Error())
+	}
+
+	if err := PublishEvent(TestEvent{
+		ID: 3,
+		Dispose: true,
+	}); err != nil {
+		t.Fatalf("failed to publish event 3: %s", err.Error())
+	}
+
+	if err := PublishEvent(TestEvent{
+		ID: 4,
+		Dispose: false,
+	}); err != nil {
+		t.Fatalf("failed to publish event 4: %s", err.Error())
+	}
+
+	sub, err := Test.Subscribe()
+	if err := Start(); err != nil {
+		t.Fatalf("failed to start state machine: %s", err.Error())
+	}
+
+	select {
+	case ev1 := <- sub:
+		if ev1.Type() != Test {
+			t.Fatalf("wrong kind of event somehow: %+v", ev1)
+		}
+		if ev1.(TestEvent).ID != 2 {
+			t.Fatalf("misordered event: %+v", ev1)
+		}
+	default:
+		t.Fatal("no events available from replay")
+	}
+
+	select {
+	case ev2 := <- sub:
+		if ev2.Type() != Test {
+			t.Fatalf("wrong kind of event somehow: %+v", ev2)
+		}
+		if ev2.(TestEvent).ID != 4 {
+			t.Fatalf("misordered event: %+v", ev2)
+		}
+	default:
+		t.Fatal("only one event made it out")
+	}
+
+	select {
+	case <- sub:
+		t.Fatalf("superfluous events left in subscription")
+	default:
+	}
+}

internal/web/web.go

@@ -0,0 +1,35 @@
+package web
+
+import (
+	"fmt"
+	"net/http"
+
+	"gitlab.com/whom/bingobot/internal/activity"
+	"gitlab.com/whom/bingobot/internal/config"
+	"gitlab.com/whom/bingobot/internal/logging"
+)
+
+func Start() error {
+	frag := config.Get().LocalWebEndpointListen
+	http.HandleFunc("/", HandleHttpRequest)
+	go logging.Error(http.ListenAndServe(frag, nil).Error())
+
+	return nil
+}
+
+func HandleHttpRequest(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "<html>")
+	fmt.Fprintf(w, "<h1> User Activity Metrics </h1>")
+	fmt.Fprintf(w, "<p> number of the last %d days a user has been active </p>",
+		config.Get().UserEventLifespanDays)
+
+	fmt.Fprintf(w, "<table>")
+	fmt.Fprintf(w, "<tr><th>User</th><th>Days</th></tr>")
+	for k, v := range activity.GetActivitySnapshot() {
+		fmt.Fprintf(w, "<tr><td>%s</td><td>%d</td></tr>",
+			k, len(v))
+	}
+	fmt.Fprintf(w, "</table>")
+
+	fmt.Fprintf(w, "</html>")
+}

main.go

@@ -4,10 +4,12 @@ import (
 	"flag"
 	"log"
 
+	"gitlab.com/whom/bingobot/internal/activity"
 	"gitlab.com/whom/bingobot/internal/config"
 	"gitlab.com/whom/bingobot/internal/discord"
 	"gitlab.com/whom/bingobot/internal/logging"
 	"gitlab.com/whom/bingobot/internal/state"
+	"gitlab.com/whom/bingobot/internal/web"
 )
 
 var (
@@ -32,11 +34,23 @@ func main() {
 	); err != nil {
 		log.Fatalf("couldn't initialize state engine: %s", err.Error())
 	}
+
+	if err := activity.Start(); err != nil {
+		// TODO: handle gracefully and continue?
+		log.Fatalf("failed to start activity module: %s", err.Error())
+	}
+
+	if err := web.Start(); err != nil {
+		log.Fatalf("failed to start local web server: %s", err.Error())
+	}
+
+	// start this LAST
+	if err := state.Start(); err != nil {
+		log.Fatalf("failed to start state machine: %s", err.Error())
+	}
 	defer state.Teardown()
 
-	err = startBot()
-
-	if err != nil {
+	if err := startBot(); err != nil {
 		log.Fatal(err)
 	}
 }

pkg/docbuf/docbuf.go

@@ -263,6 +263,11 @@ func NewDocumentBuffer(
  * If cache is full oldest document is written to backing writer.
  */
 func (b *DocBuf) Push(doc string) error {
+	if b.cacheSize == 0 {
+		b.writeToBackingStore(doc)
+		return nil
+	}
+
 	if len(b.cache) >= b.cacheSize {
 		if err := b.demote(); err != nil {
 			return err
@@ -280,6 +285,14 @@ func (b *DocBuf) Push(doc string) error {
  * out of the backing ReaderWriter.
  */
 func (b *DocBuf) Pop() (string, error) {
+	if b.cacheSize == 0 {
+		d, e := b.readDocumentsFromDisk(1, true, false)
+		if len(d) > 0 {
+			return d[0], e
+		}
+		return "", e
+	}
+
 	if len(b.cache) < 1 {
 		if err := b.promote(true); err != nil {
 			return "", err