Source code for plugin_gz_exporter

# Copyright (c) 2015, System Engineering Software Society
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import os
import gzip
from sylib.export import datasource as exportdatasource


class DataExtractGz(exportdatasource.DatasourceDataExporterBase):
    """Extractor for GZIP files."""
    EXPORTER_NAME = "GZIP"
    FILENAME_EXTENSION = None

    def __init__(self, custom_parameter_root):
        super(DataExtractGz, self).__init__(custom_parameter_root)

    def export_data(self, in_datasource, directory, progress=None):
        """Extract GZIP file."""
        filename = self._create_filename(in_datasource)
        gz_file = gzip.GzipFile(in_datasource.decode_path())
        file_content = gz_file.read()
        gz_file.close()
        with open(os.path.join(directory, filename), 'wb') as f:
            f.write(file_content)
        return [filename]

    def create_filenames(self, node_context_input):
        filenames = []
        for item in node_context_input['port0']:
            try:
                filenames.append(self._create_filename(item))
            except:
                self.warn_invalid(item)
        return filenames

    def _create_filename(self, in_datasource):
        gzip.GzipFile(in_datasource.decode_path())
        filename = os.path.splitext(in_datasource.decode_path())[0]
        return os.path.split(filename)[1]