feat: generate qt jsonrpc bindings (#8330)

- [x] When yerpc is released, fix dependency in Cargo.toml

deltachat-jsonrpc-bindings/qt/.gitignore

@@ -0,0 +1 @@
+generated

deltachat-jsonrpc-bindings/qt/deltachat-jsonrpc/cffi_client.hpp

@@ -0,0 +1,111 @@
+#pragma once
+
+#include "deltachat.h"
+#include "generated/client.hpp"
+#include "generated/types.hpp"
+
+#include <cstdint>
+#include <mutex>
+#include <thread>
+
+namespace deltachat {
+
+class CffiTransport : public Transport {
+  using CompletionHandler = Transport::CompletionHandler;
+
+public:
+  explicit CffiTransport(dc_accounts_t *accounts)
+      : jsonrpc_(dc_jsonrpc_init(accounts)) {
+    if (!jsonrpc_)
+      std::abort();
+    thread_ = std::thread([this] { run(); });
+  }
+
+  ~CffiTransport() override {
+    done_ = true;
+    // Unblock dc_jsonrpc_next_response by sending a dummy request
+    if (jsonrpc_)
+      dc_jsonrpc_request(
+          jsonrpc_,
+          "{\"jsonrpc\":\"2.0\",\"id\":0,\"method\":\"get_system_info\"}");
+    if (thread_.joinable())
+      thread_.join();
+    std::lock_guard lk(mu_);
+    for (auto &[id, cb] : pending_) {
+      cb(Result<QJsonValue>::error(-32060, "Transport destructed"));
+    }
+    pending_.clear();
+    if (jsonrpc_)
+      dc_jsonrpc_unref(jsonrpc_);
+  }
+
+  virtual void send(const QString method, const QJsonValue params,
+                    CompletionHandler onCompleted) override {
+    uint32_t id = next_id_++;
+    QJsonObject envelope{
+        {"jsonrpc", "2.0"},
+        {"id", static_cast<qint64>(id)},
+        {"method", method},
+        {"params", params},
+    };
+
+    {
+      std::lock_guard lk(mu_);
+      pending_[id] = std::move(onCompleted);
+    }
+
+    QByteArray json = QJsonDocument(envelope).toJson(QJsonDocument::Compact);
+    dc_jsonrpc_request(jsonrpc_, json.constData());
+  }
+
+private:
+  void run() {
+    while (!done_) {
+      char *raw_json = dc_jsonrpc_next_response(jsonrpc_);
+      if (!raw_json) {
+        break;
+      }
+      QByteArray json{raw_json};
+      dc_str_unref(raw_json);
+      if (done_)
+        break;
+
+      QJsonObject obj = QJsonDocument::fromJson(json).object();
+
+      if (!obj["id"].isDouble()) {
+        qCritical() << "No valid rpc id in" << QString{json};
+        continue;
+      }
+      uint32_t id = static_cast<uint32_t>(obj["id"].toInt());
+
+      CompletionHandler cb;
+      {
+        std::lock_guard<std::mutex> lk(mu_);
+        if (auto nh = pending_.extract(id)) {
+          cb = std::move(nh.mapped());
+        } else {
+          qCritical() << "Could not map response" << QString{json};
+          continue;
+        }
+      }
+      cb(parseResult(obj));
+    }
+  }
+
+private:
+  dc_jsonrpc_instance_t *jsonrpc_;
+  std::thread thread_;
+  std::mutex mu_;
+  std::atomic<uint32_t> next_id_{1};
+  std::atomic<bool> done_{false};
+  std::unordered_map<uint32_t, CompletionHandler> pending_;
+};
+
+class CffiDeltaChat : public RawClient {
+public:
+  explicit CffiDeltaChat(dc_accounts_t *accounts)
+      : RawClient(std::make_unique<CffiTransport>(accounts)) {}
+};
+
+} // namespace deltachat
+Q_DECLARE_METATYPE(deltachat::CffiDeltaChat *)