bool GZCompressAction::execute()

in src/main/cpp/gzcompressaction.cpp [57:174]
82 lines of code
16 McCabe index (conditional complexity)

bool GZCompressAction::execute(log4cxx::helpers::Pool& p) const
{
	if (priv->source.exists(p))
	{
		apr_pool_t* aprpool = p.getAPRPool();
		apr_procattr_t* attr;
		apr_status_t stat = apr_procattr_create(&attr, aprpool);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		stat = apr_procattr_io_set(attr, APR_NO_PIPE, APR_FULL_BLOCK, APR_FULL_BLOCK);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		stat = apr_procattr_cmdtype_set(attr, APR_PROGRAM_PATH);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		//
		//   set child process output to destination file
		//
		apr_file_t* child_out;
		apr_int32_t flags = APR_FOPEN_READ | APR_FOPEN_WRITE |
			APR_FOPEN_CREATE | APR_FOPEN_TRUNCATE;
		stat = priv->destination.open(&child_out, flags, APR_OS_DEFAULT, p);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		stat =  apr_procattr_child_out_set(attr, child_out, NULL);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		//
		//   redirect the child's error stream to this processes' error stream
		//
		apr_file_t* child_err;
		stat = apr_file_open_stderr(&child_err, aprpool);

		if (stat == APR_SUCCESS)
		{
			stat =  apr_procattr_child_err_set(attr, child_err, NULL);

			if (stat != APR_SUCCESS)
			{
				throw IOException(stat);
			}
		}

		priv->destination.setAutoDelete(true);

		const char** args = (const char**)
			apr_palloc(aprpool, 4 * sizeof(*args));
		int i = 0;
		args[i++] = "gzip";
		args[i++] = "-c";
		args[i++] = Transcoder::encode(priv->source.getPath(), p);
		args[i++] = NULL;

		apr_proc_t pid;
		stat = apr_proc_create(&pid, "gzip", args, NULL, attr, aprpool);

		if (stat != APR_SUCCESS && priv->throwIOExceptionOnForkFailure)
		{
			throw IOException(stat);
		}else if(stat != APR_SUCCESS && !priv->throwIOExceptionOnForkFailure)
		{
			/* If we fail here (to create the gzip child process),
			 * skip the compression and consider the rotation to be
			 * otherwise successful. The caller has already rotated
			 * the log file (`source` here refers to the
			 * uncompressed, rotated path, and `destination` the
			 * same path with `.gz` appended). Remove the empty
			 * destination file and leave source as-is.
			 */
			LogLog::warn(LOG4CXX_STR("Failed to fork gzip during log rotation; leaving log file uncompressed"));
			stat = apr_file_close(child_out);
			if (stat != APR_SUCCESS)
			{
				LogLog::warn(LOG4CXX_STR("Failed to close abandoned .gz file; ignoring"));
			}
			return true;
		}

		apr_proc_wait(&pid, NULL, NULL, APR_WAIT);
		stat = apr_file_close(child_out);

		if (stat != APR_SUCCESS)
		{
			throw IOException(stat);
		}

		priv->destination.setAutoDelete(false);

		if (priv->deleteSource)
		{
			priv->source.deleteFile(p);
		}

		return true;
	}

	return false;
}