ClickHouse/dbms/Disks/IDisk.cpp

#include "IDisk.h"
#include <IO/copyData.h>
#include <IO/ReadBufferFromFileBase.h>
#include <IO/WriteBufferFromFileBase.h>
#include <Poco/Logger.h>
#include <common/logger_useful.h>

namespace DB
{

bool IDisk::isDirectoryEmpty(const String & path)
{
    return !iterateDirectory(path)->isValid();
}

void copyFile(IDisk & from_disk, const String & from_path, IDisk & to_disk, const String & to_path)
{
    LOG_DEBUG(
        &Poco::Logger::get("IDisk"),
        "Copying from " << from_disk.getName() << " " << from_path << " to " << to_disk.getName() << " " << to_path);

    auto in = from_disk.readFile(from_path);
    auto out = to_disk.writeFile(to_path);
    copyData(*in, *out);
}

void IDisk::copy(const String & from_path, const std::shared_ptr<IDisk> & to_disk, const String & to_path)
{
    if (isFile(from_path))
    {
        DB::copyFile(*this, from_path, *to_disk, to_path + fileName(from_path));
    }
    else
    {
        Poco::Path path(from_path);
        const String & dir_name = path.directory(path.depth() - 1);
        const String dest = to_path + dir_name + "/";
        to_disk->createDirectories(dest);

        for (auto it = iterateDirectory(from_path); it->isValid(); it->next())
        {
            copy(it->path(), to_disk, dest);
        }
    }
}

}