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wakapi/services/heartbeat.go

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package services
import (
"fmt"
"github.com/leandro-lugaresi/hub"
"github.com/muety/wakapi/config"
"github.com/muety/wakapi/repositories"
"github.com/muety/wakapi/utils"
"github.com/patrickmn/go-cache"
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"strings"
"time"
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"github.com/muety/wakapi/models"
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)
type HeartbeatService struct {
config *config.Config
cache *cache.Cache
cache2 *cache.Cache
eventBus *hub.Hub
repository repositories.IHeartbeatRepository
languageMappingSrvc ILanguageMappingService
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}
func NewHeartbeatService(heartbeatRepo repositories.IHeartbeatRepository, languageMappingService ILanguageMappingService) *HeartbeatService {
srv := &HeartbeatService{
config: config.Get(),
cache: cache.New(24*time.Hour, 24*time.Hour),
cache2: cache.New(cache.NoExpiration, cache.NoExpiration),
eventBus: config.EventBus(),
repository: heartbeatRepo,
languageMappingSrvc: languageMappingService,
}
// using event hub is an unnecessary indirection here, however, we might
// potentially need heartbeat events elsewhere throughout the application some time
// so it's more consistent to already have it this way
sub1 := srv.eventBus.Subscribe(0, config.EventHeartbeatCreate)
go func(sub *hub.Subscription) {
for m := range sub.Receiver {
heartbeat := m.Fields[config.FieldPayload].(*models.Heartbeat)
srv.cache.IncrementInt64(srv.countByUserCacheKey(heartbeat.UserID), 1) // increment doesn't update expiration time
srv.cache.IncrementInt64(srv.countTotalCacheKey(), 1)
}
}(&sub1)
return srv
}
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func (srv *HeartbeatService) Insert(heartbeat *models.Heartbeat) error {
srv.updateEntityUserCacheByHeartbeat(heartbeat)
return srv.repository.InsertBatch([]*models.Heartbeat{heartbeat})
}
func (srv *HeartbeatService) InsertBatch(heartbeats []*models.Heartbeat) error {
hashes := make(map[string]bool)
// https://github.com/muety/wakapi/issues/139
filteredHeartbeats := make([]*models.Heartbeat, 0, len(heartbeats))
for _, hb := range heartbeats {
if _, ok := hashes[hb.Hash]; !ok {
filteredHeartbeats = append(filteredHeartbeats, hb)
hashes[hb.Hash] = true
}
srv.updateEntityUserCacheByHeartbeat(hb)
}
err := srv.repository.InsertBatch(filteredHeartbeats)
if err == nil {
go srv.notifyBatch(filteredHeartbeats)
}
return err
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}
func (srv *HeartbeatService) Count() (int64, error) {
result, ok := srv.cache.Get(srv.countTotalCacheKey())
if ok {
return result.(int64), nil
}
count, err := srv.repository.Count()
if err == nil {
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srv.cache.Set(srv.countTotalCacheKey(), count, srv.countCacheTtl())
}
return count, err
}
func (srv *HeartbeatService) CountByUser(user *models.User) (int64, error) {
key := srv.countByUserCacheKey(user.ID)
result, ok := srv.cache.Get(key)
if ok {
return result.(int64), nil
}
count, err := srv.repository.CountByUser(user)
if err == nil {
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srv.cache.Set(key, count, srv.countCacheTtl())
}
return count, err
}
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func (srv *HeartbeatService) CountByUsers(users []*models.User) ([]*models.CountByUser, error) {
missingUsers := make([]*models.User, 0, len(users))
userCounts := make([]*models.CountByUser, 0, len(users))
for _, u := range users {
key := srv.countByUserCacheKey(u.ID)
result, ok := srv.cache.Get(key)
if ok {
userCounts = append(userCounts, &models.CountByUser{User: u.ID, Count: result.(int64)})
} else {
missingUsers = append(missingUsers, u)
}
}
counts, err := srv.repository.CountByUsers(missingUsers)
if err != nil {
return nil, err
}
for _, uc := range counts {
key := srv.countByUserCacheKey(uc.User)
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srv.cache.Set(key, uc.Count, srv.countCacheTtl())
userCounts = append(userCounts, uc)
}
return userCounts, nil
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}
func (srv *HeartbeatService) GetAllWithin(from, to time.Time, user *models.User) ([]*models.Heartbeat, error) {
heartbeats, err := srv.repository.GetAllWithin(from, to, user)
if err != nil {
return nil, err
}
return srv.augmented(heartbeats, user.ID)
}
func (srv *HeartbeatService) GetLatestByUser(user *models.User) (*models.Heartbeat, error) {
return srv.repository.GetLatestByUser(user)
}
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func (srv *HeartbeatService) GetLatestByOriginAndUser(origin string, user *models.User) (*models.Heartbeat, error) {
return srv.repository.GetLatestByOriginAndUser(origin, user)
}
func (srv *HeartbeatService) GetFirstByUsers() ([]*models.TimeByUser, error) {
return srv.repository.GetFirstByUsers()
}
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func (srv *HeartbeatService) GetEntitySetByUser(entityType uint8, user *models.User) ([]string, error) {
cacheKey := srv.getEntityUserCacheKey(entityType, user)
if results, found := srv.cache2.Get(cacheKey); found {
return utils.SetToStrings(results.(map[string]bool)), nil
}
results, err := srv.repository.GetEntitySetByUser(entityType, user)
if err != nil {
return nil, err
}
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filtered := make([]string, 0, len(results))
for _, r := range results {
if strings.TrimSpace(r) != "" {
filtered = append(filtered, r)
}
}
srv.cache2.Set(cacheKey, utils.StringsToSet(filtered), cache.DefaultExpiration)
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return filtered, nil
}
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func (srv *HeartbeatService) DeleteBefore(t time.Time) error {
return srv.repository.DeleteBefore(t)
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}
func (srv *HeartbeatService) augmented(heartbeats []*models.Heartbeat, userId string) ([]*models.Heartbeat, error) {
languageMapping, err := srv.languageMappingSrvc.ResolveByUser(userId)
if err != nil {
return nil, err
}
for i := range heartbeats {
heartbeats[i].Augment(languageMapping)
}
return heartbeats, nil
}
func (srv *HeartbeatService) getEntityUserCacheKey(entityType uint8, user *models.User) string {
return fmt.Sprintf("entity_set_%d_%s", entityType, user.ID)
}
func (srv *HeartbeatService) updateEntityUserCache(entityType uint8, entityKey string, user *models.User) {
cacheKey := srv.getEntityUserCacheKey(entityType, user)
if entities, found := srv.cache2.Get(cacheKey); found {
if _, ok := entities.(map[string]bool)[entityKey]; !ok {
// new project / language / ..., which is not yet present in cache, arrived as part of a heartbeats
// -> invalidate cache
srv.cache2.Delete(cacheKey)
}
}
}
func (srv *HeartbeatService) updateEntityUserCacheByHeartbeat(hb *models.Heartbeat) {
srv.updateEntityUserCache(models.SummaryProject, hb.Project, hb.User)
srv.updateEntityUserCache(models.SummaryLanguage, hb.Language, hb.User)
srv.updateEntityUserCache(models.SummaryEditor, hb.Editor, hb.User)
srv.updateEntityUserCache(models.SummaryOS, hb.OperatingSystem, hb.User)
srv.updateEntityUserCache(models.SummaryMachine, hb.Machine, hb.User)
}
func (srv *HeartbeatService) notifyBatch(heartbeats []*models.Heartbeat) {
for _, hb := range heartbeats {
srv.eventBus.Publish(hub.Message{
Name: config.EventHeartbeatCreate,
Fields: map[string]interface{}{config.FieldPayload: hb},
})
}
}
func (srv *HeartbeatService) countByUserCacheKey(userId string) string {
return fmt.Sprintf("%s--hearbeat-count", userId)
}
func (srv *HeartbeatService) countTotalCacheKey() string {
return "heartbeat-count"
}
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func (srv *HeartbeatService) countCacheTtl() time.Duration {
return time.Duration(srv.config.App.CountCacheTTLMin) * time.Minute
}