#include "source/server/backtrace.h"

#include <fstream>

#include "absl/strings/str_split.h"

namespace Envoy {

bool BackwardsTrace::log_to_stderr_ = false;

const std::string& BackwardsTrace::addrMapping(bool setup) {

  CONSTRUCT_ON_FIRST_USE(std::string, [setup]() -> std::string {

    if (!setup) {

      return "";

    }

#ifndef WIN32

    std::ifstream maps("/proc/self/maps");

    if (maps.fail()) {

      return "";

    }

    std::string line;

    // Search for the first executable memory mapped block.

    while (std::getline(maps, line)) {

      std::vector<absl::string_view> parts = absl::StrSplit(line, ' ');

      if (parts[1] == "r-xp") {

        return absl::StrCat(parts[0], " ", parts.back());

      }

    }

#endif

    return "";

  }());

}

void BackwardsTrace::setLogToStderr(bool log_to_stderr) { log_to_stderr_ = log_to_stderr; }

} // namespace Envoy