From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
Subject: [PATCH] daed: open sqlite database in WAL mode
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订阅自动更新写库时，WebUI 登录查询被锁 5 秒后报 database is locked。

开 WAL 并把 busy_timeout 提到 30 秒，读不再被写事务阻塞；WAL 附带的两个文件跟主库一样收紧到 0640。
---
 db/db.go                      | 17 ++++++++++++-----
 pkg/sqlite/sqlite_mipsarch.go |  4 +++-
 pkg/sqlite/sqlite_others.go   |  4 +++-
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/db/db.go b/db/db.go
index a79022b..6145443 100644
--- a/db/db.go
+++ b/db/db.go
@@ -50,13 +50,20 @@ func InitDatabase(configDir string) (err error) {
 	); err != nil {
 		return err
 	}
-	if fi, err := os.Stat(path); err != nil {
-		return err
-	} else if fi.Mode()&0037 > 0 {
-		// Too open, chmod it to 0640.
-		if err = os.Chmod(path, 0640); err != nil {
+	for _, p := range []string{path, path + "-wal", path + "-shm"} {
+		fi, err := os.Stat(p)
+		if os.IsNotExist(err) {
+			continue
+		}
+		if err != nil {
 			return err
 		}
+		if fi.Mode()&0037 > 0 {
+			// Too open, chmod it to 0640.
+			if err = os.Chmod(p, 0640); err != nil {
+				return err
+			}
+		}
 	}
 
 	return nil
diff --git a/pkg/sqlite/sqlite_mipsarch.go b/pkg/sqlite/sqlite_mipsarch.go
index 7b8c1b4..8c275e5 100644
--- a/pkg/sqlite/sqlite_mipsarch.go
+++ b/pkg/sqlite/sqlite_mipsarch.go
@@ -10,6 +10,8 @@ import (
 	"gorm.io/gorm"
 )
 
+const pragmas = "?_journal_mode=WAL&_busy_timeout=30000&_synchronous=FULL"
+
 func Open(dsn string) gorm.Dialector {
-	return sqlite.Open(dsn)
+	return sqlite.Open(dsn + pragmas)
 }
diff --git a/pkg/sqlite/sqlite_others.go b/pkg/sqlite/sqlite_others.go
index 4598651..83d8b80 100644
--- a/pkg/sqlite/sqlite_others.go
+++ b/pkg/sqlite/sqlite_others.go
@@ -7,6 +7,8 @@ import (
 	"gorm.io/gorm"
 )
 
+const pragmas = "?_pragma=journal_mode(WAL)&_pragma=busy_timeout(30000)&_pragma=synchronous(FULL)"
+
 func Open(dsn string) gorm.Dialector {
-	return sqlite.Open(dsn)
+	return sqlite.Open(dsn + pragmas)
 }