Package app: Add mutex to persistingTokenSource.

diff --git a/app/user.go b/app/user.go
index e47a5cc..1215653 100644 (file)
--- a/app/user.go
+++ b/app/user.go
@@ -4,6 +4,7 @@ import (
        "context"
        "fmt"
        "net/http"
+       "sync"
 
        "github.com/google/uuid"
        legacy_context "golang.org/x/net/context"
@@ -107,9 +108,14 @@ type persistingTokenSource struct {
        t   *oauth2.Token
        src oauth2.TokenSource
        key *datastore.Key
+
+       sync.Mutex
 }
 
 func (s *persistingTokenSource) Token() (*oauth2.Token, error) {
+       s.Lock()
+       defer s.Unlock()
+
        tok, err := s.src.Token()
        if err != nil {
                return nil, err