DB: remove shared stuff, add singleton

Add Config class

source/config.d

@@ -0,0 +1,21 @@
+module config;
+
+import std.json;
+import std.file;
+
+import slf4d;
+
+class Config {
+  JSONValue v;
+  private string m_path;
+
+  this(string path = "./config.json") {
+    this.m_path = path;
+  }
+
+  void load() {
+    debugF!"Trying to load config from %s"(this.m_path);
+    string contents = readText(this.m_path);
+    this.v = parseJSON(contents);
+  }
+}

source/db/db.d

@@ -24,17 +24,17 @@ class DB {
   protected DataSource m_ds;
   protected Connection m_conn;
 
-  shared this(DBSettings settings) {
+  this(DBSettings settings) {
     this.m_settings = settings;
   }
 
-  static shared(DB) getDB(DBSettings settings) {
+  static DB getDB(DBSettings settings) {
     switch (settings.connector) {
     case DBConnector.DB_PGSQL:
       import db.pgsql;
 
       debugF!"DB type is PostgreSQL";
-      return new shared PostgresDB(settings);
+      return new PostgresDB(settings);
 
     default:
       throw new Exception("DB not supported");

source/db/pgsql.d

@@ -5,8 +5,10 @@ import db.db;
 import ddbc.core;
 import ddbc.common;
 
+import slf4d;
+
 class PostgresDB : DB {
-  shared this(Args...)(auto ref Args args) {
+  this(Args...)(auto ref Args args) {
     super(args);
   }
 
@@ -22,6 +24,8 @@ class PostgresDB : DB {
       params = PGSQLDriver.setUserAndPassword(username, password);
     }
 
+    debugF!"DB URL: %s"(url);
+
     return new ConnectionPoolDataSourceImpl(driver, url, params);
   }
 }

source/main.d

@@ -1,5 +1,45 @@
 module main;
 
-void main() {
+import slf4d;
+import slf4d.default_provider;
 
+import config;
+import singletons;
+import db.db;
+
+int main() {
+	auto provider = new DefaultProvider(true, Levels.DEBUG);
+	configureLoggingProvider(provider);
+
+	Config cfg = new Config();
+
+	try {
+		cfg.load();
+	} catch (Exception e) {
+		error(e);
+		return 21;
+	}
+
+	DBSettings dbSettings;
+	auto dbCfg = cfg.v["db"];
+	with (dbSettings) {
+		host = dbCfg["host"].str;
+		port = cast(ushort) dbCfg["port"].integer;
+		username = dbCfg["username"].str;
+		password = dbCfg["password"].str;
+		dbname = dbCfg["dbName"].str;
+
+		switch (dbCfg["connector"].str) {
+		case "postgresql":
+			connector = DBConnector.DB_PGSQL;
+			break;
+		default:
+			break;
+		}
+	}
+
+	Db = DB.getDB(dbSettings);
+	Db.connect();
+
+	return 0;
 }

source/singletons.d

@@ -0,0 +1,5 @@
+module singletons;
+
+import db.db;
+
+DB Db;