rework session updates to use new patch method

Update the AccessTracker, WebAuthn handlers, and identity manager
refresh loop to perform their session record updates using the
databroker Patch() method.

This should prevent any of these updates from conflicting.

authorize/access_tracker.go

@@ -2,11 +2,13 @@ package authorize
 
 import (
 	"context"
+	"fmt"
 	"sync/atomic"
 	"time"
 
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/pomerium/pomerium/internal/log"
@@ -158,13 +160,12 @@ func (tracker *AccessTracker) updateSession(
 	ctx, clearTimeout := context.WithTimeout(ctx, accessTrackerUpdateTimeout)
 	defer clearTimeout()
 
-	s, err := session.Get(ctx, client, sessionID)
-	if status.Code(err) == codes.NotFound {
-		return nil
-	} else if err != nil {
-		return err
+	s := &session.Session{Id: sessionID, AccessedAt: timestamppb.Now()}
+	m, err := fieldmaskpb.New(s, "accessed_at")
+	if err != nil {
+		return fmt.Errorf("internal error: %w", err)
 	}
-	s.AccessedAt = timestamppb.Now()
-	_, err = session.Put(ctx, client, s)
+
+	_, err = session.Patch(ctx, client, s, m)
 	return err
 }

authorize/grpc_test.go

@@ -13,6 +13,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/structpb"
 
 	"github.com/pomerium/pomerium/authorize/evaluator"
@@ -21,6 +23,7 @@ import (
 	"github.com/pomerium/pomerium/internal/sessions"
 	"github.com/pomerium/pomerium/internal/testutil"
 	"github.com/pomerium/pomerium/pkg/grpc/databroker"
+	"github.com/pomerium/pomerium/pkg/storage"
 )
 
 const certPEM = `
@@ -289,6 +292,37 @@ func (m mockDataBrokerServiceClient) Put(ctx context.Context, in *databroker.Put
 	return m.put(ctx, in, opts...)
 }
 
+// Patch emulates the patch operation using Get and Put. (This is not atomic.)
+func (m mockDataBrokerServiceClient) Patch(ctx context.Context, in *databroker.PatchRequest, opts ...grpc.CallOption) (*databroker.PatchResponse, error) {
+	var records []*databroker.Record
+	for _, record := range in.GetRecords() {
+		getResponse, err := m.Get(ctx, &databroker.GetRequest{
+			Type: record.GetType(),
+			Id:   record.GetId(),
+		})
+		if storage.IsNotFound(err) {
+			continue
+		} else if err != nil {
+			return nil, err
+		}
+
+		existing := getResponse.GetRecord()
+		if err := storage.PatchRecord(existing, record, in.GetFieldMask()); err != nil {
+			return nil, status.Errorf(codes.Unknown, err.Error())
+		}
+
+		records = append(records, record)
+	}
+	putResponse, err := m.Put(ctx, &databroker.PutRequest{Records: records})
+	if err != nil {
+		return nil, err
+	}
+	return &databroker.PatchResponse{
+		ServerVersion: putResponse.GetServerVersion(),
+		Records:       putResponse.GetRecords(),
+	}, nil
+}
+
 func mustParseURL(rawURL string) url.URL {
 	u, err := url.Parse(rawURL)
 	if err != nil {

internal/handlers/webauthn/webauthn.go

@@ -13,6 +13,7 @@ import (
 	"github.com/google/uuid"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/pomerium/pomerium/internal/httputil"
@@ -405,8 +406,13 @@ func (h *Handler) handleView(w http.ResponseWriter, r *http.Request, state *Stat
 }
 
 func (h *Handler) saveSessionAndRedirect(w http.ResponseWriter, r *http.Request, state *State, rawRedirectURI string) error {
+	fm, err := fieldmaskpb.New(state.Session, "device_credentials")
+	if err != nil {
+		return fmt.Errorf("internal error: %w", err)
+	}
+
 	// save the session to the databroker
-	res, err := session.Put(r.Context(), state.Client, state.Session)
+	res, err := session.Patch(r.Context(), state.Client, state.Session, fm)
 	if err != nil {
 		return err
 	}

internal/identity/manager/manager.go

@@ -12,6 +12,7 @@ import (
 	"golang.org/x/sync/errgroup"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/pomerium/pomerium/internal/atomicutil"
@@ -288,7 +289,13 @@ func (mgr *Manager) refreshSessionInternal(
 		return false
 	}
 
-	if _, err := session.Put(ctx, mgr.cfg.Load().dataBrokerClient, s.Session); err != nil {
+	fm, err := fieldmaskpb.New(s.Session, "oauth_token", "claims")
+	if err != nil {
+		log.Error(ctx).Err(err).Msg("internal error")
+		return false
+	}
+
+	if _, err := session.Patch(ctx, mgr.cfg.Load().dataBrokerClient, s.Session, fm); err != nil {
 		log.Error(ctx).Err(err).
 			Str("user_id", s.GetUserId()).
 			Str("session_id", s.GetId()).

internal/identity/manager/manager_test.go

@@ -13,6 +13,7 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/pomerium/pomerium/internal/events"
@@ -241,12 +242,17 @@ func TestManager_refreshSession(t *testing.T) {
 		ExpiresAt:    timestamppb.New(now.Add(5 * time.Minute)),
 		RefreshToken: "new-refresh-token",
 	}
-	client.EXPECT().Put(gomock.Any(),
-		objectsAreEqualMatcher{&databroker.PutRequest{Records: []*databroker.Record{{
-			Type: "type.googleapis.com/session.Session",
-			Id:   "session-id",
-			Data: protoutil.NewAny(expectedSession),
-		}}}}).
+	client.EXPECT().Patch(gomock.Any(), objectsAreEqualMatcher{
+		&databroker.PatchRequest{
+			Records: []*databroker.Record{{
+				Type: "type.googleapis.com/session.Session",
+				Id:   "session-id",
+				Data: protoutil.NewAny(expectedSession),
+			}},
+			FieldMask: &fieldmaskpb.FieldMask{
+				Paths: []string{"oauth_token", "claims"},
+			},
+		}}).
 		Return(nil /* this result is currently unused */, nil)
 	mgr.refreshSession(context.Background(), "user-id", "session-id")
 

pkg/grpc/session/session.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/fieldmaskpb"
 	"google.golang.org/protobuf/types/known/structpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 
@@ -63,6 +64,24 @@ func Put(ctx context.Context, client databroker.DataBrokerServiceClient, s *Sess
 	return res, err
 }
 
+// Patch updates specific fields of an existing session in the databroker.
+func Patch(
+	ctx context.Context, client databroker.DataBrokerServiceClient,
+	s *Session, fields *fieldmaskpb.FieldMask,
+) (*databroker.PatchResponse, error) {
+	s = proto.Clone(s).(*Session)
+	data := protoutil.NewAny(s)
+	res, err := client.Patch(ctx, &databroker.PatchRequest{
+		Records: []*databroker.Record{{
+			Type: data.GetTypeUrl(),
+			Id:   s.Id,
+			Data: data,
+		}},
+		FieldMask: fields,
+	})
+	return res, err
+}
+
 // AddClaims adds the flattened claims to the session.
 func (x *Session) AddClaims(claims identity.FlattenedClaims) {
 	if x.Claims == nil {