Allow using legacy database connections (#1785)

* Allow using legacy db connections

* Lint

* Description and docs

docs/Configuring-Suwayomi‐Server.md

@@ -245,11 +245,13 @@ server.databaseType = H2 # H2, POSTGRESQL
 server.databaseUrl = "postgresql://localhost:5432/suwayomi"
 server.databaseUsername = ""
 server.databasePassword = ""
+server.useHikariConnectionPool = true
 ```
 - `server.databaseType` chooses which type of database to use. [H2](https://en.wikipedia.org/wiki/H2_Database_Engine) is the default; it is a simple file-based database for Java applications. Since it is only based on files without a server process, file corruption can be common when the server is not shut down properly. [PostgreSQL](https://en.wikipedia.org/wiki/PostgreSQL) is a popular cross-platform, stable database. To use PostgreSQL, you need to run an instance yourself.
 - `server.databaseUrl` the URL where to find the PostgreSQL server, including the database name.
 - `server.databaseUsername` the username with which to authenticate at the PostgreSQL instance.
 - `server.databasePassword` the username with which to authenticate at the PostgreSQL instance.
+- `server.useHikariConnectionPool` use Hikari Connection Pool to connect to the database.
 
 **Note:** The example [docker-compose.yml file](https://github.com/Suwayomi/Suwayomi-Server-docker/blob/main/docker-compose.yml) contains everything you need to get started with Suwayomi+PostgreSQL. Please be aware that PostgreSQL support is currently still in beta.
 

server/server-config/src/main/kotlin/suwayomi/tachidesk/server/ServerConfig.kt

@@ -914,6 +914,14 @@ class ServerConfig(
         key = "serveConversions"
     )
 
+    val useHikariConnectionPool: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 85,
+        group = SettingGroup.DATABASE,
+        defaultValue = true,
+        excludeFromBackup = true,
+        description = "Use Hikari Connection Pool to connect to the database.",
+    )
+
 
 
     /** ****************************************************************** **/

server/src/main/kotlin/suwayomi/tachidesk/server/ServerSetup.kt

@@ -125,6 +125,7 @@ data class DatabaseSettings(
     val databaseUrl: String,
     val databaseUsername: String,
     val databasePassword: String,
+    val useHikariConnectionPool: Boolean,
 )
 
 val androidCompat by lazy { AndroidCompat() }
@@ -398,17 +399,19 @@ fun applicationSetup() {
             serverConfig.databaseUrl,
             serverConfig.databaseUsername,
             serverConfig.databasePassword,
+            serverConfig.useHikariConnectionPool,
         ) { vargs ->
             DatabaseSettings(
                 vargs[0] as DatabaseType,
                 vargs[1] as String,
                 vargs[2] as String,
                 vargs[3] as String,
+                vargs[4] as Boolean,
             )
         }.distinctUntilChanged(),
-        { (databaseType, databaseUrl, databaseUsername, _) ->
+        { (databaseType, databaseUrl, databaseUsername, _, hikariCp) ->
             logger.info {
-                "Database changed - type=$databaseType url=$databaseUrl, username=$databaseUsername, password=[REDACTED]"
+                "Database changed - type=$databaseType url=$databaseUrl, username=$databaseUsername, password=[REDACTED], hikaricp=$hikariCp"
             }
             databaseUp()
 

server/src/main/kotlin/suwayomi/tachidesk/server/database/DBManager.kt

@@ -95,12 +95,30 @@ object DBManager {
                 preserveKeywordCasing = false
             }
 
-        // Create a new HikariCP pool
-        hikariDataSource = createHikariDataSource()
+        return if (serverConfig.useHikariConnectionPool.value) {
+            // Create a new HikariCP pool
+            hikariDataSource = createHikariDataSource()
 
-        return Database
-            .connect(hikariDataSource!!, databaseConfig = dbConfig)
-            .also { db = it }
+            return Database
+                .connect(hikariDataSource!!, databaseConfig = dbConfig)
+        } else {
+            when (serverConfig.databaseType.value) {
+                DatabaseType.POSTGRESQL ->
+                    Database.connect(
+                        "jdbc:${serverConfig.databaseUrl.value}",
+                        "org.postgresql.Driver",
+                        user = serverConfig.databaseUsername.value,
+                        password = serverConfig.databasePassword.value,
+                        databaseConfig = dbConfig,
+                    )
+                DatabaseType.H2 ->
+                    Database.connect(
+                        "jdbc:h2:${Injekt.get<ApplicationDirs>().dataRoot}/database",
+                        "org.h2.Driver",
+                        databaseConfig = dbConfig,
+                    )
+            }
+        }.also { db = it }
     }
 
     fun shutdown() {