From a575025f1fadf8cb5dfeedc1da217942cb024cfa Mon Sep 17 00:00:00 2001
From: Haelnorr <lockedonohoe@gmail.com>
Date: Thu, 20 Feb 2025 22:31:20 +1100
Subject: [PATCH] Renamed test file for safeconn and safetx to reflect new file
 structure

---
 db/safeconntx_test.go | 143 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 db/safeconntx_test.go

diff --git a/db/safeconntx_test.go b/db/safeconntx_test.go
new file mode 100644
index 0000000..b1816d7
--- /dev/null
+++ b/db/safeconntx_test.go
@@ -0,0 +1,143 @@
+package db
+
+import (
+	"context"
+	"projectreshoot/tests"
+	"strconv"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSafeConn(t *testing.T) {
+	cfg, err := tests.TestConfig()
+	require.NoError(t, err)
+	logger := tests.NilLogger()
+	ver, err := strconv.ParseInt(cfg.DBName, 10, 0)
+	require.NoError(t, err)
+	conn, err := tests.SetupTestDB(ver)
+	require.NoError(t, err)
+	sconn := MakeSafe(conn, logger)
+	defer sconn.Close()
+
+	t.Run("Global lock waits for read locks to finish", func(t *testing.T) {
+		tx, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		var requested sync.WaitGroup
+		var engaged sync.WaitGroup
+		requested.Add(1)
+		engaged.Add(1)
+		go func() {
+			requested.Done()
+			sconn.Pause(5 * time.Second)
+			engaged.Done()
+		}()
+		requested.Wait()
+		assert.Equal(t, uint32(0), sconn.globalLockStatus)
+		assert.Equal(t, uint32(1), sconn.globalLockRequested)
+		tx.Commit()
+		engaged.Wait()
+		assert.Equal(t, uint32(1), sconn.globalLockStatus)
+		assert.Equal(t, uint32(0), sconn.globalLockRequested)
+		sconn.Resume()
+	})
+	t.Run("Lock abandons after timeout", func(t *testing.T) {
+		tx, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		sconn.Pause(250 * time.Millisecond)
+		assert.Equal(t, uint32(0), sconn.globalLockStatus)
+		assert.Equal(t, uint32(0), sconn.globalLockRequested)
+		tx.Commit()
+	})
+	t.Run("Pause blocks transactions and resume allows", func(t *testing.T) {
+		tx, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		var requested sync.WaitGroup
+		var engaged sync.WaitGroup
+		requested.Add(1)
+		engaged.Add(1)
+		go func() {
+			requested.Done()
+			sconn.Pause(5 * time.Second)
+			engaged.Done()
+		}()
+		requested.Wait()
+		assert.Equal(t, uint32(0), sconn.globalLockStatus)
+		assert.Equal(t, uint32(1), sconn.globalLockRequested)
+		ctx, cancel := context.WithTimeout(t.Context(), 250*time.Millisecond)
+		defer cancel()
+		_, err = sconn.Begin(ctx)
+		require.Error(t, err)
+		tx.Commit()
+		engaged.Wait()
+		_, err = sconn.Begin(ctx)
+		require.Error(t, err)
+		sconn.Resume()
+		tx, err = sconn.Begin(t.Context())
+		require.NoError(t, err)
+		tx.Commit()
+	})
+}
+func TestSafeTX(t *testing.T) {
+	cfg, err := tests.TestConfig()
+	require.NoError(t, err)
+	logger := tests.NilLogger()
+	ver, err := strconv.ParseInt(cfg.DBName, 10, 0)
+	require.NoError(t, err)
+	conn, err := tests.SetupTestDB(ver)
+	require.NoError(t, err)
+	sconn := MakeSafe(conn, logger)
+	defer sconn.Close()
+
+	t.Run("Commit releases lock", func(t *testing.T) {
+		tx, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		assert.Equal(t, uint32(1), sconn.readLockCount)
+		tx.Commit()
+		assert.Equal(t, uint32(0), sconn.readLockCount)
+	})
+	t.Run("Rollback releases lock", func(t *testing.T) {
+		tx, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		assert.Equal(t, uint32(1), sconn.readLockCount)
+		tx.Rollback()
+		assert.Equal(t, uint32(0), sconn.readLockCount)
+	})
+	t.Run("Multiple TX can gain read lock", func(t *testing.T) {
+		tx1, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		tx2, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		tx3, err := sconn.Begin(t.Context())
+		require.NoError(t, err)
+		tx1.Commit()
+		tx2.Commit()
+		tx3.Commit()
+	})
+	t.Run("Lock acquiring times out after timeout", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(t.Context(), 250*time.Millisecond)
+		defer cancel()
+		sconn.acquireGlobalLock()
+		defer sconn.releaseGlobalLock()
+		_, err := sconn.Begin(ctx)
+		require.Error(t, err)
+	})
+	t.Run("Lock acquires if lock released", func(t *testing.T) {
+		ctx, cancel := context.WithTimeout(t.Context(), 250*time.Millisecond)
+		defer cancel()
+		sconn.acquireGlobalLock()
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			tx, err := sconn.Begin(ctx)
+			require.NoError(t, err)
+			tx.Commit()
+			wg.Done()
+		}()
+		sconn.releaseGlobalLock()
+		wg.Wait()
+	})
+}