concurrently invalidate mtime cache in jsoncs3 share manager

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

changelog/unreleased/jsoncs3-concurrency.md

@@ -0,0 +1,3 @@
+Bugfix: concurrently invalidate mtime cache in jsoncs3 share manager
+
+https://github.com/cs3org/reva/pull/3933

pkg/share/manager/jsoncs3/jsoncs3.go

@@ -33,6 +33,7 @@ import (
 	"github.com/mitchellh/mapstructure"
 	"github.com/pkg/errors"
 	"github.com/rs/zerolog/log"
+	"golang.org/x/sync/errgroup"
 	"google.golang.org/genproto/protobuf/field_mask"
 
 	gatewayv1beta1 "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
@@ -115,6 +116,7 @@ func init() {
 
 type config struct {
 	GatewayAddr       string       `mapstructure:"gateway_addr"`
+	MaxConcurrency    int          `mapstructure:"max_concurrency"`
 	ProviderAddr      string       `mapstructure:"provider_addr"`
 	ServiceUserID     string       `mapstructure:"service_user_id"`
 	ServiceUserIdp    string       `mapstructure:"service_user_idp"`
@@ -145,6 +147,8 @@ type Manager struct {
 
 	initialized bool
 
+	MaxConcurrency int
+
 	gateway     gatewayv1beta1.GatewayAPIClient
 	eventStream events.Stream
 }
@@ -703,7 +707,6 @@ func (m *Manager) ListReceivedShares(ctx context.Context, filters []*collaborati
 	m.Lock()
 	defer m.Unlock()
 
-	var rss []*collaboration.ReceivedShare
 	user := ctxpkg.ContextMustGetUser(ctx)
 
 	ssids := map[string]*receivedsharecache.Space{}
@@ -750,46 +753,98 @@ func (m *Manager) ListReceivedShares(ctx context.Context, filters []*collaborati
 		}
 	}
 
-	for ssid, rspace := range ssids {
-		storageID, spaceID, _ := shareid.Decode(ssid)
-		err := m.Cache.Sync(ctx, storageID, spaceID)
-		if err != nil {
-			continue
-		}
-		for shareID, state := range rspace.States {
-			s := m.Cache.Get(storageID, spaceID, shareID)
-			if s == nil {
-				continue
+	numWorkers := m.MaxConcurrency
+	if len(ssids) < numWorkers {
+		numWorkers = len(ssids)
+	}
+
+	type w struct {
+		ssid   string
+		rspace *receivedsharecache.Space
+	}
+	work := make(chan w)
+	results := make(chan *collaboration.ReceivedShare)
+
+	g, ctx := errgroup.WithContext(ctx)
+
+	// Distribute work
+	g.Go(func() error {
+		defer close(work)
+		for ssid, rspace := range ssids {
+			select {
+			case work <- w{ssid, rspace}:
+			case <-ctx.Done():
+				return ctx.Err()
 			}
-			if share.IsExpired(s) {
-				if err := m.removeShare(ctx, s); err != nil {
-					log.Error().Err(err).
-						Msg("failed to unshare expired share")
-				}
-				if err := events.Publish(m.eventStream, events.ShareExpired{
-					ShareOwner:     s.GetOwner(),
-					ItemID:         s.GetResourceId(),
-					ExpiredAt:      time.Unix(int64(s.GetExpiration().GetSeconds()), int64(s.GetExpiration().GetNanos())),
-					GranteeUserID:  s.GetGrantee().GetUserId(),
-					GranteeGroupID: s.GetGrantee().GetGroupId(),
-				}); err != nil {
-					log.Error().Err(err).
-						Msg("failed to publish share expired event")
+		}
+		return nil
+	})
+
+	// Spawn workers that'll concurrently work the queue
+	for i := 0; i < numWorkers; i++ {
+		g.Go(func() error {
+			for w := range work {
+				storageID, spaceID, _ := shareid.Decode(w.ssid)
+				err := m.Cache.Sync(ctx, storageID, spaceID)
+				if err != nil {
+					continue
 				}
-				continue
-			}
+				for shareID, state := range w.rspace.States {
+					s := m.Cache.Get(storageID, spaceID, shareID)
+					if s == nil {
+						continue
+					}
+					if share.IsExpired(s) {
+						if err := m.removeShare(ctx, s); err != nil {
+							log.Error().Err(err).
+								Msg("failed to unshare expired share")
+						}
+						if err := events.Publish(m.eventStream, events.ShareExpired{
+							ShareOwner:     s.GetOwner(),
+							ItemID:         s.GetResourceId(),
+							ExpiredAt:      time.Unix(int64(s.GetExpiration().GetSeconds()), int64(s.GetExpiration().GetNanos())),
+							GranteeUserID:  s.GetGrantee().GetUserId(),
+							GranteeGroupID: s.GetGrantee().GetGroupId(),
+						}); err != nil {
+							log.Error().Err(err).
+								Msg("failed to publish share expired event")
+						}
+						continue
+					}
 
-			if share.IsGrantedToUser(s, user) {
-				if share.MatchesFiltersWithState(s, state.State, filters) {
-					rs := &collaboration.ReceivedShare{
-						Share:      s,
-						State:      state.State,
-						MountPoint: state.MountPoint,
+					if share.IsGrantedToUser(s, user) {
+						if share.MatchesFiltersWithState(s, state.State, filters) {
+							rs := &collaboration.ReceivedShare{
+								Share:      s,
+								State:      state.State,
+								MountPoint: state.MountPoint,
+							}
+							select {
+							case results <- rs:
+							case <-ctx.Done():
+								return ctx.Err()
+							}
+						}
 					}
-					rss = append(rss, rs)
 				}
 			}
-		}
+			return nil
+		})
+	}
+
+	// Wait for things to settle down, then close results chan
+	go func() {
+		_ = g.Wait() // error is checked later
+		close(results)
+	}()
+
+	rss := []*collaboration.ReceivedShare{}
+	for n := range results {
+		rss = append(rss, n)
+	}
+
+	if err := g.Wait(); err != nil {
+		return nil, err
 	}
 
 	return rss, nil