ref: a7c01127f9749fe471367c6461cde357403cc3b3
dir: /sys/src/cmd/hg/hgext/inotify/client.py/
# client.py - inotify status client
#
# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>
# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>
# Copyright 2009 Nicolas Dumazet <nicdumz@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
from mercurial.i18n import _
import common, server
import errno, os, socket, struct
class QueryFailed(Exception): pass
def start_server(function):
"""
Decorator.
Tries to call function, if it fails, try to (re)start inotify server.
Raise QueryFailed if something went wrong
"""
def decorated_function(self, *args):
result = None
try:
return function(self, *args)
except (OSError, socket.error), err:
autostart = self.ui.configbool('inotify', 'autostart', True)
if err[0] == errno.ECONNREFUSED:
self.ui.warn(_('(found dead inotify server socket; '
'removing it)\n'))
os.unlink(os.path.join(self.root, '.hg', 'inotify.sock'))
if err[0] in (errno.ECONNREFUSED, errno.ENOENT) and autostart:
self.ui.debug(_('(starting inotify server)\n'))
try:
try:
server.start(self.ui, self.dirstate, self.root)
except server.AlreadyStartedException, inst:
# another process may have started its own
# inotify server while this one was starting.
self.ui.debug(str(inst))
except Exception, inst:
self.ui.warn(_('could not start inotify server: '
'%s\n') % inst)
else:
try:
return function(self, *args)
except socket.error, err:
self.ui.warn(_('could not talk to new inotify '
'server: %s\n') % err[-1])
elif err[0] in (errno.ECONNREFUSED, errno.ENOENT):
# silently ignore normal errors if autostart is False
self.ui.debug(_('(inotify server not running)\n'))
else:
self.ui.warn(_('failed to contact inotify server: %s\n')
% err[-1])
self.ui.traceback()
raise QueryFailed('inotify query failed')
return decorated_function
class client(object):
def __init__(self, ui, repo):
self.ui = ui
self.dirstate = repo.dirstate
self.root = repo.root
self.sock = socket.socket(socket.AF_UNIX)
def _connect(self):
sockpath = os.path.join(self.root, '.hg', 'inotify.sock')
try:
self.sock.connect(sockpath)
except socket.error, err:
if err[0] == "AF_UNIX path too long":
sockpath = os.readlink(sockpath)
self.sock.connect(sockpath)
else:
raise
def _send(self, type, data):
"""Sends protocol version number, and the data"""
self.sock.sendall(chr(common.version) + type + data)
self.sock.shutdown(socket.SHUT_WR)
def _receive(self, type):
"""
Read data, check version number, extract headers,
and returns a tuple (data descriptor, header)
Raises QueryFailed on error
"""
cs = common.recvcs(self.sock)
try:
version = ord(cs.read(1))
except TypeError:
# empty answer, assume the server crashed
self.ui.warn(_('received empty answer from inotify server'))
raise QueryFailed('server crashed')
if version != common.version:
self.ui.warn(_('(inotify: received response from incompatible '
'server version %d)\n') % version)
raise QueryFailed('incompatible server version')
readtype = cs.read(4)
if readtype != type:
self.ui.warn(_('(inotify: received \'%s\' response when expecting'
' \'%s\')\n') % (readtype, type))
raise QueryFailed('wrong response type')
hdrfmt = common.resphdrfmts[type]
hdrsize = common.resphdrsizes[type]
try:
resphdr = struct.unpack(hdrfmt, cs.read(hdrsize))
except struct.error:
raise QueryFailed('unable to retrieve query response headers')
return cs, resphdr
def query(self, type, req):
self._connect()
self._send(type, req)
return self._receive(type)
@start_server
def statusquery(self, names, match, ignored, clean, unknown=True):
def genquery():
for n in names:
yield n
states = 'almrx!'
if ignored:
raise ValueError('this is insanity')
if clean: states += 'c'
if unknown: states += '?'
yield states
req = '\0'.join(genquery())
cs, resphdr = self.query('STAT', req)
def readnames(nbytes):
if nbytes:
names = cs.read(nbytes)
if names:
return filter(match, names.split('\0'))
return []
return map(readnames, resphdr)
@start_server
def debugquery(self):
cs, resphdr = self.query('DBUG', '')
nbytes = resphdr[0]
names = cs.read(nbytes)
return names.split('\0')