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#include <Common/FileRenamer.h>
#include <Common/DateLUT.h>
#include <Common/Exception.h>
#include <chrono>
#include <filesystem>
#include <format>
#include <map>
#include <re2/re2.h>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/replace.hpp>
namespace fs = std::filesystem;
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
FileRenamer::FileRenamer() = default;
FileRenamer::FileRenamer(const String & renaming_rule)
: rule(renaming_rule)
{
FileRenamer::validateRenamingRule(rule, true);
}
String FileRenamer::generateNewFilename(const String & filename) const
{
// Split filename and extension
String file_base = fs::path(filename).stem();
String file_ext = fs::path(filename).extension();
// Get current timestamp in microseconds
String timestamp;
if (rule.find("%t") != String::npos)
{
auto now = std::chrono::system_clock::now();
timestamp = std::to_string(timeInMicroseconds(now));
}
// Define placeholders and their corresponding values
std::map<String, String> placeholders =
{
{"%a", filename},
{"%f", file_base},
{"%e", file_ext},
{"%t", timestamp},
{"%%", "%"}
};
// Replace placeholders with their actual values
String new_name = rule;
for (const auto & [placeholder, value] : placeholders)
boost::replace_all(new_name, placeholder, value);
return new_name;
}
bool FileRenamer::isEmpty() const
{
return rule.empty();
}
bool FileRenamer::validateRenamingRule(const String & rule, bool throw_on_error)
{
// Check if the rule contains invalid placeholders
re2::RE2 invalid_placeholder_pattern("^([^%]|%[afet%])*$");
if (!re2::RE2::FullMatch(rule, invalid_placeholder_pattern))
{
if (throw_on_error)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Invalid renaming rule: Allowed placeholders only %a, %f, %e, %t, and %%");
return false;
}
// Replace valid placeholders with empty strings and count remaining percentage signs.
String replaced_rule = rule;
boost::replace_all(replaced_rule, "%a", "");
boost::replace_all(replaced_rule, "%f", "");
boost::replace_all(replaced_rule, "%e", "");
boost::replace_all(replaced_rule, "%t", "");
if (std::count(replaced_rule.begin(), replaced_rule.end(), '%') % 2)
{
if (throw_on_error)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Invalid renaming rule: Odd number of consecutive percentage signs");
return false;
}
return true;
}
} // DB
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