Filesystem.cc

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/*
 * Copyright (C) 2007-2015 Hypertable, Inc.
 *
 * This file is part of Hypertable.
 *
 * Hypertable is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 3 of the
 * License, or any later version.
 *
 * Hypertable is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#include <Common/Compat.h>

#include "Filesystem.h"

#include <Common/Error.h>
#include <Common/Serialization.h>

#include <boost/algorithm/string.hpp>

#include <strings.h>

using namespace Hypertable;
using namespace Serialization;

uint8_t Filesystem::Dirent::encoding_version() const {
  return 1;
}

size_t Filesystem::Dirent::encoded_length_internal() const {
  return 13 + encoded_length_vstr(name);
}

void Filesystem::Dirent::encode_internal(uint8_t **bufp) const {
  encode_vstr(bufp, name);
  encode_i64(bufp, length);
  encode_i32(bufp, last_modification_time);
  encode_bool(bufp, is_dir);
}

void Filesystem::Dirent::decode_internal(uint8_t version, const uint8_t **bufp,
                                         size_t *remainp) {
  name = decode_vstr(bufp, remainp);
  length = decode_i64(bufp, remainp);
  last_modification_time = decode_i32(bufp, remainp);
  is_dir = decode_bool(bufp, remainp);
}


void
Filesystem::decode_response_readdir(EventPtr &event_ptr,
                                    std::vector<Dirent> &listing) {
  const uint8_t *decode_ptr = event_ptr->payload;
  size_t decode_remain = event_ptr->payload_len;

  int error = decode_i32(&decode_ptr, &decode_remain);

  if (error != Error::OK)
    HT_THROW(error, "");

  uint32_t len = decode_i32(&decode_ptr, &decode_remain);

  listing.clear();
  listing.reserve(len);
  Dirent entry;
  for (uint32_t i = 0; i < len; i++) {
    entry.decode(&decode_ptr, &decode_remain);
    listing.push_back(entry);
  }
}


bool
Filesystem::decode_response_exists(EventPtr &event_ptr) {
  const uint8_t *decode_ptr = event_ptr->payload;
  size_t decode_remain = event_ptr->payload_len;

  int error = decode_i32(&decode_ptr, &decode_remain);

  if (error != Error::OK)
    HT_THROW(error, "");

  return decode_bool(&decode_ptr, &decode_remain);
}


int
Filesystem::decode_response(EventPtr &event_ptr) {
  const uint8_t *decode_ptr = event_ptr->payload;
  size_t decode_remain = event_ptr->payload_len;

  return decode_i32(&decode_ptr, &decode_remain);
}

static String &
remove_trailing_duplicates(String &s, char separator) {
  while (s.size() > 1) {
    if (s[s.size()-1] == separator)
      s.resize(s.size() - 1);
    else
      break;
  }

  return s;
}

String Filesystem::dirname(String name, char separator) {
  if (name.size() == 1 && name[0] == separator)
    return name;

  // Remove trailing separators
  std::string::size_type cur = name.length();
  while (cur > 0 && name[cur - 1] == separator)
    --cur;
  name.resize(cur);

  // Find last separator
  std::string::size_type pos = name.rfind(separator);

  if (pos == std::string::npos)
    name = "."; // No separators
  else if (pos == 0 && name.length() == 1 && name[0] == separator)
    name = separator; // Only separators
  else if (pos == 0 && name.length() > 1 && name[0] == separator)
    name = "/";
  else
    name.resize(pos);

  // Remove any duplicate adjacent path separators
  return remove_trailing_duplicates(name, separator);
}


String Filesystem::basename(String name, char separator) {
  if (name.size() == 1 && name[0] == separator)
    return name;

  // Remove trailing separators
  std::string::size_type cur = name.length();
  while (cur > 0 && name[cur - 1] == separator)
    --cur;
  name.resize(cur);

  // Find last separator
  std::string::size_type pos = name.rfind(separator);

  std::string ret;
  if (pos == std::string::npos)
    ; // No separators
  else if (pos == 0 && name.length() == 1 && name[0] == separator)
    name = separator; // Only separators
  else
    name = name.substr(pos + 1); // Basename only

  // Remove any duplicate adjacent path separators
  return remove_trailing_duplicates(name, separator);
}


Filesystem::Flags Hypertable::convert(std::string str) {
  boost::trim_if(str, boost::is_any_of("\"'"));
  if (!strcasecmp(str.c_str(), "FLUSH"))
    return Filesystem::Flags::FLUSH;
  else if (!strcasecmp(str.c_str(), "SYNC"))
    return Filesystem::Flags::SYNC;
  else if (!strcasecmp(str.c_str(), "NONE"))
    return Filesystem::Flags::NONE;
  HT_THROWF(Error::INVALID_ARGUMENT, "Unrecognized argument: %s", str.c_str());
}