C++ Item::cache_filename方法代码示例

// Returns the resulting file or in case of extraction the destination
// directory (for logging).
static Try<string> fetchFromCache(
    const FetcherInfo::Item& item,
    const string& cacheDirectory,
    const string& sandboxDirectory)
{
  LOG(INFO) << "Fetching from cache";

  Try<string> basename = Fetcher::basename(item.uri().value());
  if (basename.isError()) {
    return Error(basename.error());
  }

  string destinationPath = path::join(sandboxDirectory, basename.get());

  // Non-empty cache filename is guaranteed by the callers of this function.
  CHECK(!item.cache_filename().empty());

  string sourcePath = path::join(cacheDirectory, item.cache_filename());

  if (item.uri().executable()) {
    Try<string> copied = copyFile(sourcePath, destinationPath);
    if (copied.isError()) {
      return Error(copied.error());
    }

    return chmodExecutable(copied.get());
  } else if (item.uri().extract()) {
    Try<bool> extracted = extract(sourcePath, sandboxDirectory);
    if (extracted.isError()) {
      return Error(extracted.error());
    } else if (extracted.get()) {
      return sandboxDirectory;
    } else {
      LOG(WARNING) << "Copying instead of extracting resource from URI with "
                   << "'extract' flag, because it does not seem to be an "
                   << "archive: " << item.uri().value();
    }
  }

  return copyFile(sourcePath, destinationPath);
}

// Returns the resulting file or in case of extraction the destination
// directory (for logging).
static Try<string> fetchThroughCache(
    const FetcherInfo::Item& item,
    const Option<string>& cacheDirectory,
    const string& sandboxDirectory,
    const Option<string>& frameworksHome)
{
  if (cacheDirectory.isNone() || cacheDirectory.get().empty()) {
    return Error("Cache directory not specified");
  }

  if (!item.has_cache_filename() || item.cache_filename().empty()) {
    // This should never happen if this program is used by the Mesos
    // slave and could then be a CHECK. But other uses are possible.
    return Error("No cache file name for: " + item.uri().value());
  }

  CHECK_NE(FetcherInfo::Item::BYPASS_CACHE, item.action())
    << "Unexpected fetcher action selector";

  if (item.action() == FetcherInfo::Item::DOWNLOAD_AND_CACHE) {
    LOG(INFO) << "Downloading into cache";

    Try<Nothing> mkdir = os::mkdir(cacheDirectory.get());
    if (mkdir.isError()) {
      return Error("Failed to create fetcher cache directory '" +
                   cacheDirectory.get() + "': " + mkdir.error());
    }

    Try<string> downloaded = download(
        item.uri().value(),
        path::join(cacheDirectory.get(), item.cache_filename()),
        frameworksHome);

    if (downloaded.isError()) {
      return Error(downloaded.error());
    }
  }

  return fetchFromCache(item, cacheDirectory.get(), sandboxDirectory);
}