We build too many walls and not enough bridges

internal/imap/cache/cache_test.go

@@ -0,0 +1,99 @@
+// Copyright (c) 2020 Proton Technologies AG
+//
+// This file is part of ProtonMail Bridge.
+//
+// ProtonMail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// ProtonMail Bridge 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with ProtonMail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package cache
+
+import (
+	"bytes"
+	"fmt"
+	"testing"
+	"time"
+
+	bckMsg "github.com/ProtonMail/proton-bridge/pkg/message"
+	"github.com/stretchr/testify/require"
+)
+
+var bs = &bckMsg.BodyStructure{} //nolint[gochecknoglobals]
+const testUID = "testmsg"
+
+func TestSaveAndLoad(t *testing.T) {
+	msg := []byte("Test message")
+
+	SaveMail(testUID, msg, bs)
+	require.Equal(t, mailCache[testUID].data, msg)
+
+	reader, _ := LoadMail(testUID)
+	require.Equal(t, reader.Len(), len(msg))
+	stored := make([]byte, len(msg))
+	_, _ = reader.Read(stored)
+	require.Equal(t, stored, msg)
+}
+
+func TestMissing(t *testing.T) {
+	reader, _ := LoadMail("non-existing")
+	require.Equal(t, reader.Len(), 0)
+}
+
+func TestClearOld(t *testing.T) {
+	cacheTimeLimit = 10
+	msg := []byte("Test message")
+	SaveMail(testUID, msg, bs)
+	time.Sleep(100 * time.Millisecond)
+
+	reader, _ := LoadMail(testUID)
+	require.Equal(t, reader.Len(), 0)
+}
+
+func TestClearBig(t *testing.T) {
+	msg := []byte("Test message")
+
+	nSize := 3
+	cacheSizeLimit = nSize*len(msg) + 1
+	cacheTimeLimit = int64(nSize * nSize * 2) // be sure the message will survive
+
+	// It should have more than nSize items.
+	for i := 0; i < nSize*nSize; i++ {
+		time.Sleep(1 * time.Millisecond)
+		SaveMail(fmt.Sprintf("%s%d", testUID, i), msg, bs)
+		if len(mailCache) > nSize {
+			t.Error("Number of items in cache should not be more than", nSize)
+		}
+	}
+
+	// Check that the oldest are deleted first.
+	for i := 0; i < nSize*nSize; i++ {
+		iUID := fmt.Sprintf("%s%d", testUID, i)
+		reader, _ := LoadMail(iUID)
+		if i < nSize*(nSize-1) && reader.Len() != 0 {
+			mail := mailCache[iUID]
+			t.Error("LoadMail should return empty but have:", mail.data, iUID, mail.key.Timestamp)
+		}
+		stored := make([]byte, len(msg))
+		_, _ = reader.Read(stored)
+
+		if i >= nSize*(nSize-1) && !bytes.Equal(stored, msg) {
+			t.Error("LoadMail returned wrong message:", stored, iUID)
+		}
+	}
+}
+
+func TestConcurency(t *testing.T) {
+	msg := []byte("Test message")
+	for i := 0; i < 10; i++ {
+		go SaveMail(fmt.Sprintf("%s%d", testUID, i), msg, bs)
+	}
+}