Initial working base separated from top-level monero project

src/scanner.h

@@ -0,0 +1,59 @@
+// Copyright (c) 2018-2020, The Monero Project
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#pragma once
+
+#include <atomic>
+#include <boost/optional/optional.hpp>
+#include <cstdint>
+#include <string>
+
+#include "db/storage.h"
+#include "rpc/client.h"
+
+namespace lws
+{
+  //! Scans all active `db::account`s. Detects if another process changes active list.
+  class scanner
+  {
+    static std::atomic<bool> running;
+
+    scanner() = delete;
+
+  public:
+    //! Use `client` to sync blockchain data, and \return client if successful.
+    static expect<rpc::client> sync(db::storage disk, rpc::client client);
+
+    //! Poll daemon until `stop()` is called, using `thread_count` threads.
+    static void run(db::storage disk, rpc::context ctx, std::size_t thread_count);
+
+    //! \return True if `stop()` has never been called.
+    static bool is_running() noexcept { return running; }
+
+    //! Stops all scanner instances globally.
+    static void stop() noexcept { running = false; }
+  };
+} // lws