feat: Add mcp client hub

mcp/McpServerConnection.hpp

@@ -0,0 +1,93 @@
+// Copyright (C) 2024-2026 Petr Mironychev
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QHash>
+#include <QJsonObject>
+#include <QObject>
+#include <QPointer>
+#include <QProcessEnvironment>
+#include <QString>
+#include <QStringList>
+#include <QTimer>
+#include <QUrl>
+
+namespace LLMQore::Mcp {
+class McpClient;
+class McpTransport;
+} // namespace LLMQore::Mcp
+
+namespace QodeAssist::PluginLLMCore {
+class Provider;
+}
+
+namespace QodeAssist::Mcp {
+
+enum class McpTransportKind { Http, Stdio };
+
+struct McpServerConfig
+{
+    QString name;
+    bool enabled = true;
+
+    McpTransportKind transport = McpTransportKind::Http;
+
+    // HTTP/SSE transport
+    QUrl url;
+    QHash<QString, QString> headers;
+    QString spec; // MCP protocol spec, e.g. "2024-11-05"; empty = Latest.
+
+    // Stdio transport
+    QString command;
+    QStringList args;
+    QHash<QString, QString> env;
+    QString workingDirectory;
+
+    static McpServerConfig fromJson(const QString &name, const QJsonObject &obj);
+    QJsonObject toJson() const;
+};
+
+enum class McpConnectionState { Disabled, Connecting, Connected, Failed };
+
+class McpServerConnection : public QObject
+{
+    Q_OBJECT
+public:
+    explicit McpServerConnection(McpServerConfig config, QObject *parent = nullptr);
+    ~McpServerConnection() override;
+
+    const McpServerConfig &config() const { return m_config; }
+    McpConnectionState state() const { return m_state; }
+    QString statusText() const { return m_statusText; }
+    int toolCount() const { return m_toolIds.size(); }
+    QStringList toolNames() const { return m_toolIds; }
+
+    void setProviders(const QList<PluginLLMCore::Provider *> &providers);
+
+    void connectToServer();
+    void disconnectFromServer();
+
+signals:
+    void stateChanged();
+
+private:
+    void setState(McpConnectionState state, const QString &text = {});
+    void fetchAndRegisterTools();
+    void registerTools(const QList<::LLMQore::Mcp::McpClient *> & /*unused*/);
+    void unregisterTools();
+    ::LLMQore::Mcp::McpTransport *createTransport();
+
+    McpServerConfig m_config;
+    McpConnectionState m_state = McpConnectionState::Disabled;
+    QString m_statusText;
+
+    QPointer<::LLMQore::Mcp::McpClient> m_client;
+    QPointer<::LLMQore::Mcp::McpTransport> m_transport;
+    QPointer<QTimer> m_listToolsWatchdog;
+
+    QList<QPointer<PluginLLMCore::Provider>> m_providers;
+    QStringList m_toolIds;
+};
+
+} // namespace QodeAssist::Mcp