Added ability to test the connection in the dialog where the connection details are entered.

pglablib/ASyncDBConnection.h

@@ -51,25 +51,25 @@ public:
 	/** This version of send uses the signal onQueryResult and onQueryError to report back
 	 * the completion of the query.
 	 */
-	bool send(const std::string &command, Pgsql::Params params = Pgsql::Params())
-	{
-		return send(command, params, [this] (Expected<std::shared_ptr<Pgsql::Result>> res, qint64) {
-			if (res.valid()) {
-				emit onQueryResult(res.get());
-			}
-			else {
-				emit onQueryError();
-			}
-		});
-	}
+//	bool send(const std::string &command, Pgsql::Params params = Pgsql::Params())
+//	{
+//		return send(command, params, [this] (Expected<std::shared_ptr<Pgsql::Result>> res, qint64) {
+//			if (res.valid()) {
+//				emit onQueryResult(res.get());
+//			}
+//			else {
+//				emit onQueryError();
+//			}
+//		});
+//	}
 
 	bool cancel();
     
 signals:
     void onStateChanged(ASyncDBConnection::State state);
     void onNotice(Pgsql::ErrorDetails notice);
-	void onQueryResult(std::shared_ptr<Pgsql::Result> result);
-	void onQueryError();
+//	void onQueryResult(std::shared_ptr<Pgsql::Result> result);
+//	void onQueryError();
 
 private:
 	Pgsql::Connection m_connection;

pglablib/TestConnection.cpp

@@ -0,0 +1,58 @@
+#include "TestConnection.h"
+#include "ConnectionConfig.h"
+#include "Pgsql_Connection.h"
+#include "Pgsql_PgException.h"
+
+TestConnectionResult TestConnectionResult::Failed(QString msg)
+{
+    return TestConnectionResult(false, msg, {});
+}
+
+TestConnectionResult TestConnectionResult::Success(QStringList databases)
+{
+    return TestConnectionResult(true, "Test succesfull", databases);
+}
+
+bool TestConnectionResult::ok() const
+{
+    return Ok;
+}
+
+QString TestConnectionResult::message() const
+{
+    return Message;
+}
+
+const QStringList &TestConnectionResult::databases() const
+{
+    return Databases;
+}
+
+TestConnectionResult::TestConnectionResult(bool ok, QString msg, QStringList databases)
+    : Ok(ok)
+    , Message(msg)
+    , Databases(databases)
+{}
+
+TestConnectionResult TestConnection(const ConnectionConfig &cc)
+{
+    try {
+        Pgsql::Connection conn;
+        conn.connect(cc.connectionString());
+
+        auto result = conn.query(
+            "SELECT datname\n"
+            "  FROM pg_database\n"
+            "  WHERE datallowconn AND has_database_privilege(datname, 'connect')\n"
+            "  ORDER BY 1");
+
+        QStringList dbs;
+        for (auto row : result)
+            dbs.append(row.get(0));
+
+        return TestConnectionResult::Success(dbs);
+    }
+    catch (const Pgsql::PgException &ex) {
+        return TestConnectionResult::Failed(QString::fromUtf8(ex.what()));
+    }
+}

pglablib/TestConnection.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <QString>
+#include <QStringList>
+
+class ConnectionConfig;
+
+class TestConnectionResult {
+public:
+    /// Creates an instance signalling failure
+    static TestConnectionResult Failed(QString msg);
+    /// Creates a result instance signalling success
+    static TestConnectionResult Success(QStringList databases);
+
+    TestConnectionResult() = default;
+
+    bool ok() const;
+    QString message() const;
+    const QStringList& databases() const;
+private:
+    bool Ok;
+    QString Message;
+    QStringList Databases;
+
+    TestConnectionResult(bool ok, QString msg, QStringList databases);
+};
+
+/// Test if a connection can be opened using the details in cc
+///
+/// It returns either the error message from the string on failure
+/// or a list of databases the details give access to.
+TestConnectionResult TestConnection(const ConnectionConfig &cc);

pglablib/pglablib.pro

@@ -23,6 +23,7 @@ SOURCES += \
         Pglablib.cpp \
 	ASyncDBConnection.cpp \
 	ConnectionConfig.cpp \
+    TestConnection.cpp \
     WaitHandleList.cpp \
 	catalog/PgType.cpp \
 	catalog/PgTypeContainer.cpp \
@@ -89,6 +90,7 @@ HEADERS += \
         Pglablib.h \
 	ASyncDBConnection.h \
 	ConnectionConfig.h \
+    TestConnection.h \
     WaitHandleList.h \
     Win32Event.h \
 	catalog/PgType.h \