FileIO.py

import urllib2
import httplib
import logging

logger = logging.getLogger('apple2rss.fileio')

class FileIOBase(object):
    """docstring for FileIOBase"""
    def __init__(self):
        super(FileIOBase, self).__init__()
        pass

    def open(self):
        """docstring for open"""
        raise NotImplementedError

    def read(self):
        """docstring for read"""
        raise NotImplementedError

    def delete(self):
        """docstring for delete"""
        raise NotImplementedError
        self._content = None

    def write(self):
        """docstring for write"""
        raise NotImplementedError

class RemoteHtmlFileIO(FileIOBase):
    """HtmlFileIO's open function is grab a page from web site return str"""
    def __init__(self, url = None):
        super(RemoteHtmlFileIO, self).__init__()
        self._url = url
        self._content = None

    @property
    def url(self):
        return self._url

    def open(self, url = None):
        """docstring for open"""
        if url:
            self._url = url

        try:
            url_req = urllib2.Request(self._url)
            url_req.add_header("User-agent", "Mozilla/5.0")
            self._content = urllib2.urlopen(url_req).read()
        except IOError, ErrMsg:
            logger.warning('Maybe %s is dead', self._url)
            return None
        except httplib.BadStatusLine:
            logger.warning('happen BadStatusLine', self._url)
            return None

        return self._content

    def read(self):
        """docstring for read"""
        return self._content

    def delete(self):
        """docstring for delete"""
        self._content = None