96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
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#pragma once
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#include <QByteArray>
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#include <QObject>
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#include <QString>
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#include <QStringList>
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#include <QtQmlIntegration>
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class QNetworkAccessManager;
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class QNetworkReply;
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class QTimer;
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namespace PhpQml::Bridge {
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/// Single-topic Mercure SSE subscriber.
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///
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/// Implements the `text/event-stream` line protocol on top of QNetworkReply,
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/// with exponential reconnect (1s → 2s → … → cap 30s) and `Last-Event-ID`
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/// resume across reconnects. See PLAN.md §7 (MercureClient) and §3
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/// *Edge cases — Sleep / wake* for the resume contract.
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///
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/// One client = one topic. Application code instantiates one per
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/// subscribed topic; multi-topic aggregation is a Phase 2 concern.
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class MercureClient : public QObject
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{
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Q_OBJECT
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QML_ELEMENT
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Q_PROPERTY(QString hubUrl READ hubUrl WRITE setHubUrl NOTIFY hubUrlChanged)
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Q_PROPERTY(QString topic READ topic WRITE setTopic NOTIFY topicChanged)
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Q_PROPERTY(QString token READ token WRITE setToken NOTIFY tokenChanged)
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Q_PROPERTY(bool active READ active NOTIFY activeChanged)
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Q_PROPERTY(QString lastEventId READ lastEventId NOTIFY lastEventIdChanged)
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public:
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explicit MercureClient(QObject* parent = nullptr);
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~MercureClient() override;
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QString hubUrl() const { return m_hubUrl; }
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void setHubUrl(const QString& url);
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QString topic() const { return m_topic; }
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void setTopic(const QString& t);
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QString token() const { return m_token; }
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void setToken(const QString& t);
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bool active() const noexcept { return m_active; }
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QString lastEventId() const { return m_lastEventId; }
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Q_INVOKABLE void start();
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Q_INVOKABLE void stop();
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signals:
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void hubUrlChanged();
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void topicChanged();
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void tokenChanged();
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void activeChanged();
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void lastEventIdChanged();
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/// Emitted for every dispatched SSE event with a `data:` field.
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/// `data` is the joined data lines as the hub sent them; `id` is
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/// the SSE event id (often a UUIDv7).
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void update(const QString& data, const QString& id);
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void error(const QString& detail);
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private slots:
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void onReadyRead();
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void onFinished();
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void doConnect();
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private:
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void scheduleReconnect();
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void teardownReply();
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void emitMessage();
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void setActive(bool a);
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QNetworkAccessManager* m_nam = nullptr;
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QNetworkReply* m_reply = nullptr;
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QTimer* m_reconnectTimer = nullptr;
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QString m_hubUrl;
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QString m_topic;
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QString m_token;
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QString m_lastEventId;
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QStringList m_dataLines;
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QByteArray m_pendingEventId;
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bool m_active = false;
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bool m_userStopped = false;
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int m_currentBackoffMs = kInitialBackoffMs;
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static constexpr int kInitialBackoffMs = 1000;
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static constexpr int kMaxBackoffMs = 30000;
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};
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} // namespace PhpQml::Bridge
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