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# R overlay -- dependency resolution, listener modules
# -*- coding: utf-8 -*-
# Copyright (C) 2012 André Erdmann <dywi@mailerd.de>
# Distributed under the terms of the GNU General Public License;
# either version 2 of the License, or (at your option) any later version.
"""dependency resolver listeners"""
__all__ = [
'UnresolvableFileListener', 'UnresolvableSetFileListener',
'ResolvedFileListener',
]
import os
from roverlay.depres import events
from roverlay.depres.communication import DependencyResolverListener
def get_resolved_str ( dep_env ):
return "{dep_str!r} as {dep!r}".format (
dep_str=dep_env.dep_str, dep=dep_env.resolved_by.dep
)
# --- end of get_resolved_str (...) ---
def get_unresolved_str ( dep_env ):
return "0x{dep_type:x}, {dep_str}".format (
dep_type=dep_env.deptype_mask, dep_str=dep_env.dep_str
)
# --- end of get_unresolved_str (...) ---
class FileListener ( DependencyResolverListener ):
"""A dependency resolution listener that writes events to a file."""
def __init__ ( self, _file, listen_mask ):
"""Initializes a FileListener.
arguments:
* _file -- file to write
* listen_mask -- a bit mask (int) that defines the events to be
processed.
"""
super ( FileListener, self ) . __init__ ()
self.fh = None
self.event_mask = listen_mask
self._file = _file
if self._file is None:
raise Exception ( "no file assigned" )
# --- end of __init__ (...) ---
def _event ( self, event_type, to_write ):
"""Writes to_write if event_type is accepted by self.event_mask."""
if self.event_mask & event_type:
if not self.fh:
fdir = os.path.dirname ( self._file )
if not os.path.isdir ( fdir ):
os.makedirs ( fdir )
self.fh = open ( self._file, 'a' )
self.fh.write ( to_write + "\n" )
# when to close? with open (...) as fh:...?
# --- end of _event (...) ---
def close ( self ):
"""Closes this listener (closes the file handle if open)."""
if self.fh: self.fh.close()
# --- end of close (...) ---
class SetFileListener ( DependencyResolverListener ):
def __init__ ( self, _file, listen_mask ):
super ( SetFileListener, self ) . __init__ ()
self._buffer = set()
self.event_mask = listen_mask
self._file = _file
if self._file is None:
raise Exception ( "no file assigned" )
# --- end of __init__ (...) ---
def _event ( self, event_type, to_add ):
if self.event_mask & event_type:
self._buffer.add ( to_add )
# --- end of _event (...) ---
def write ( self, sort_entries=True ):
fh = None
try:
fdir = os.path.dirname ( self._file )
if not os.path.isdir ( fdir ):
os.makedirs ( fdir )
fh = open ( self._file, 'w' )
if sort_entries:
fh.write ( '\n'.join (
sorted ( self._buffer, key=lambda x: x.lower() ) )
)
else:
fh.write ( '\n'.join ( self._buffer ) )
fh.write ( '\n' )
fh.close()
finally:
if fh:
fh.close()
# --- end of write (...) ---
def close ( self ):
self.write()
# --- end of close (...) ---
class ResolvedFileListener ( FileListener ):
"""A FileListener that listens to 'dependency resolved' events."""
def __init__ ( self, _file ):
super ( ResolvedFileListener, self ) . __init__ (
_file, events.DEPRES_EVENTS ['RESOLVED']
)
# --- end of __init__ (...) ---
def notify ( self, event_type, dep_env=None, pkg_env=None, **extra ):
self._event ( event_type, get_resolved_str ( dep_env ) )
# --- end of notify (...) ---
class UnresolvableFileListener ( FileListener ):
"""A FileListener that listens to 'dependency unresolvable' events."""
def __init__ ( self, _file ):
super ( UnresolvableFileListener, self ) . __init__ (
_file, events.DEPRES_EVENTS ['UNRESOLVABLE']
)
# --- end of __init__ (...) ---
def notify ( self, event_type, dep_env=None, pkg_env=None, **extra ):
self._event ( event_type, get_unresolved_str ( dep_env ) )
# --- end of notify (...) ---
class UnresolvableSetFileListener ( SetFileListener ):
"""A SetFileListener that listens to 'dependency unresolvable' events."""
def __init__ ( self, _file ):
super ( UnresolvableSetFileListener, self ) . __init__ (
_file, events.DEPRES_EVENTS ['UNRESOLVABLE']
)
# --- end of __init__ (...) ---
def notify ( self, event_type, dep_env=None, pkg_env=None, **extra ):
self._event ( event_type, get_unresolved_str ( dep_env ) )
# --- end of notify (...) ---
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