fix null returned session (#159)

internal/db/bundb/session.go

@@ -21,6 +21,7 @@ package bundb
 import (
 	"context"
 	"crypto/rand"
+	"errors"
 
 	"github.com/sirupsen/logrus"
 	"github.com/superseriousbusiness/gotosocial/internal/config"
@@ -37,21 +38,34 @@ type sessionDB struct {
 }
 
 func (s *sessionDB) GetSession(ctx context.Context) (*gtsmodel.RouterSession, db.Error) {
-	rs := new(gtsmodel.RouterSession)
+	rss := []*gtsmodel.RouterSession{}
 
-	q := s.conn.
+	_, err := s.conn.
 		NewSelect().
-		Model(rs).
+		Model(&rss).
-		Limit(1)
+		Limit(1).
+		Order("id DESC").
+		Exec(ctx)
+	if err != nil {
+		return nil, processErrorResponse(err)
+	}
 
-	_, err := q.Exec(ctx)
+	if len(rss) <= 0 {
+		// no session created yet, so make one
+		return s.createSession(ctx)
+	}
 
-	err = processErrorResponse(err)
+	if len(rss) != 1 {
+		// we asked for 1 so we should get 1
+		return nil, errors.New("more than 1 router session was returned")
+	}
 
-	return rs, err
+	// return the one session found
+	rs := rss[0]
+	return rs, nil
 }
 
-func (s *sessionDB) CreateSession(ctx context.Context) (*gtsmodel.RouterSession, db.Error) {
+func (s *sessionDB) createSession(ctx context.Context) (*gtsmodel.RouterSession, db.Error) {
 	auth := make([]byte, 32)
 	crypt := make([]byte, 32)
 

internal/db/bundb/session_test.go

@@ -0,0 +1,77 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package bundb_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/suite"
+	"github.com/superseriousbusiness/gotosocial/testrig"
+)
+
+type SessionTestSuite struct {
+	BunDBStandardTestSuite
+}
+
+func (suite *SessionTestSuite) SetupSuite() {
+	suite.testTokens = testrig.NewTestTokens()
+	suite.testClients = testrig.NewTestClients()
+	suite.testApplications = testrig.NewTestApplications()
+	suite.testUsers = testrig.NewTestUsers()
+	suite.testAccounts = testrig.NewTestAccounts()
+	suite.testAttachments = testrig.NewTestAttachments()
+	suite.testStatuses = testrig.NewTestStatuses()
+	suite.testTags = testrig.NewTestTags()
+	suite.testMentions = testrig.NewTestMentions()
+}
+
+func (suite *SessionTestSuite) SetupTest() {
+	suite.config = testrig.NewTestConfig()
+	suite.db = testrig.NewTestDB()
+	suite.log = testrig.NewTestLog()
+
+	testrig.StandardDBSetup(suite.db, suite.testAccounts)
+}
+
+func (suite *SessionTestSuite) TearDownTest() {
+	testrig.StandardDBTeardown(suite.db)
+}
+
+func (suite *SessionTestSuite) TestGetSession() {
+	session, err := suite.db.GetSession(context.Background())
+	suite.NoError(err)
+	suite.NotNil(session)
+	suite.NotEmpty(session.Auth)
+	suite.NotEmpty(session.Crypt)
+	suite.NotEmpty(session.ID)
+
+	// TODO -- the same session should be returned with consecutive selects
+	// right now there's an issue with bytea in bun, so uncomment this when that issue is fixed: https://github.com/uptrace/bun/issues/122
+	// session2, err := suite.db.GetSession(context.Background())
+	// suite.NoError(err)
+	// suite.NotNil(session2)
+	// suite.Equal(session.Auth, session2.Auth)
+	// suite.Equal(session.Crypt, session2.Crypt)
+	// suite.Equal(session.ID, session2.ID)
+}
+
+func TestSessionTestSuite(t *testing.T) {
+	suite.Run(t, new(SessionTestSuite))
+}

internal/db/session.go

@@ -27,5 +27,4 @@ import (
 // Session handles getting/creation of router sessions.
 type Session interface {
 	GetSession(ctx context.Context) (*gtsmodel.RouterSession, Error)
-	CreateSession(ctx context.Context) (*gtsmodel.RouterSession, Error)
 }

internal/gtsmodel/routersession.go

@@ -21,6 +21,6 @@ package gtsmodel
 // RouterSession is used to store and retrieve settings for a router session.
 type RouterSession struct {
 	ID    string `bun:"type:CHAR(26),pk,notnull"`
-	Auth  []byte `bun:"type:bytea,notnull"`
+	Auth  []byte `bun:"type:bytea,notnull,nullzero"`
-	Crypt []byte `bun:"type:bytea,notnull"`
+	Crypt []byte `bun:"type:bytea,notnull,nullzero"`
 }

internal/router/session.go

@@ -47,18 +47,9 @@ func useSession(ctx context.Context, cfg *config.Config, sessionDB db.Session, e
 	// check if we have a saved router session already
 	rs, err := sessionDB.GetSession(ctx)
 	if err != nil {
-		if err != db.ErrNoEntries {
+		return fmt.Errorf("error using session: %s", err)
-			// proper error occurred
-			return err
 	}
-		// no session saved so create a new one
+	if rs == nil || rs.Auth == nil || rs.Crypt == nil {
-		rs, err = sessionDB.CreateSession(ctx)
-		if err != nil {
-			return err
-		}
-	}
-
-	if rs == nil {
 		return errors.New("router session was nil")
 	}