|
|
# commandserver.py - communicate with Mercurial's API over a pipe
|
|
|
#
|
|
|
# Copyright Matt Mackall <mpm@selenic.com>
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
import errno
|
|
|
import gc
|
|
|
import os
|
|
|
import random
|
|
|
import signal
|
|
|
import socket
|
|
|
import struct
|
|
|
import traceback
|
|
|
|
|
|
try:
|
|
|
import selectors
|
|
|
|
|
|
selectors.BaseSelector
|
|
|
except ImportError:
|
|
|
from .thirdparty import selectors2 as selectors
|
|
|
|
|
|
from .i18n import _
|
|
|
from .pycompat import getattr
|
|
|
from . import (
|
|
|
encoding,
|
|
|
error,
|
|
|
loggingutil,
|
|
|
pycompat,
|
|
|
repocache,
|
|
|
util,
|
|
|
vfs as vfsmod,
|
|
|
)
|
|
|
from .utils import (
|
|
|
cborutil,
|
|
|
procutil,
|
|
|
)
|
|
|
|
|
|
|
|
|
class channeledoutput(object):
|
|
|
"""
|
|
|
Write data to out in the following format:
|
|
|
|
|
|
data length (unsigned int),
|
|
|
data
|
|
|
"""
|
|
|
|
|
|
def __init__(self, out, channel):
|
|
|
self.out = out
|
|
|
self.channel = channel
|
|
|
|
|
|
@property
|
|
|
def name(self):
|
|
|
return b'<%c-channel>' % self.channel
|
|
|
|
|
|
def write(self, data):
|
|
|
if not data:
|
|
|
return
|
|
|
# single write() to guarantee the same atomicity as the underlying file
|
|
|
self.out.write(struct.pack(b'>cI', self.channel, len(data)) + data)
|
|
|
self.out.flush()
|
|
|
|
|
|
def __getattr__(self, attr):
|
|
|
if attr in ('isatty', 'fileno', 'tell', 'seek'):
|
|
|
raise AttributeError(attr)
|
|
|
return getattr(self.out, attr)
|
|
|
|
|
|
|
|
|
class channeledmessage(object):
|
|
|
"""
|
|
|
Write encoded message and metadata to out in the following format:
|
|
|
|
|
|
data length (unsigned int),
|
|
|
encoded message and metadata, as a flat key-value dict.
|
|
|
|
|
|
Each message should have 'type' attribute. Messages of unknown type
|
|
|
should be ignored.
|
|
|
"""
|
|
|
|
|
|
# teach ui that write() can take **opts
|
|
|
structured = True
|
|
|
|
|
|
def __init__(self, out, channel, encodename, encodefn):
|
|
|
self._cout = channeledoutput(out, channel)
|
|
|
self.encoding = encodename
|
|
|
self._encodefn = encodefn
|
|
|
|
|
|
def write(self, data, **opts):
|
|
|
opts = pycompat.byteskwargs(opts)
|
|
|
if data is not None:
|
|
|
opts[b'data'] = data
|
|
|
self._cout.write(self._encodefn(opts))
|
|
|
|
|
|
def __getattr__(self, attr):
|
|
|
return getattr(self._cout, attr)
|
|
|
|
|
|
|
|
|
class channeledinput(object):
|
|
|
"""
|
|
|
Read data from in_.
|
|
|
|
|
|
Requests for input are written to out in the following format:
|
|
|
channel identifier - 'I' for plain input, 'L' line based (1 byte)
|
|
|
how many bytes to send at most (unsigned int),
|
|
|
|
|
|
The client replies with:
|
|
|
data length (unsigned int), 0 meaning EOF
|
|
|
data
|
|
|
"""
|
|
|
|
|
|
maxchunksize = 4 * 1024
|
|
|
|
|
|
def __init__(self, in_, out, channel):
|
|
|
self.in_ = in_
|
|
|
self.out = out
|
|
|
self.channel = channel
|
|
|
|
|
|
@property
|
|
|
def name(self):
|
|
|
return b'<%c-channel>' % self.channel
|
|
|
|
|
|
def read(self, size=-1):
|
|
|
if size < 0:
|
|
|
# if we need to consume all the clients input, ask for 4k chunks
|
|
|
# so the pipe doesn't fill up risking a deadlock
|
|
|
size = self.maxchunksize
|
|
|
s = self._read(size, self.channel)
|
|
|
buf = s
|
|
|
while s:
|
|
|
s = self._read(size, self.channel)
|
|
|
buf += s
|
|
|
|
|
|
return buf
|
|
|
else:
|
|
|
return self._read(size, self.channel)
|
|
|
|
|
|
def _read(self, size, channel):
|
|
|
if not size:
|
|
|
return b''
|
|
|
assert size > 0
|
|
|
|
|
|
# tell the client we need at most size bytes
|
|
|
self.out.write(struct.pack(b'>cI', channel, size))
|
|
|
self.out.flush()
|
|
|
|
|
|
length = self.in_.read(4)
|
|
|
length = struct.unpack(b'>I', length)[0]
|
|
|
if not length:
|
|
|
return b''
|
|
|
else:
|
|
|
return self.in_.read(length)
|
|
|
|
|
|
def readline(self, size=-1):
|
|
|
if size < 0:
|
|
|
size = self.maxchunksize
|
|
|
s = self._read(size, b'L')
|
|
|
buf = s
|
|
|
# keep asking for more until there's either no more or
|
|
|
# we got a full line
|
|
|
while s and s[-1] != b'\n':
|
|
|
s = self._read(size, b'L')
|
|
|
buf += s
|
|
|
|
|
|
return buf
|
|
|
else:
|
|
|
return self._read(size, b'L')
|
|
|
|
|
|
def __iter__(self):
|
|
|
return self
|
|
|
|
|
|
def next(self):
|
|
|
l = self.readline()
|
|
|
if not l:
|
|
|
raise StopIteration
|
|
|
return l
|
|
|
|
|
|
__next__ = next
|
|
|
|
|
|
def __getattr__(self, attr):
|
|
|
if attr in ('isatty', 'fileno', 'tell', 'seek'):
|
|
|
raise AttributeError(attr)
|
|
|
return getattr(self.in_, attr)
|
|
|
|
|
|
|
|
|
_messageencoders = {
|
|
|
b'cbor': lambda v: b''.join(cborutil.streamencode(v)),
|
|
|
}
|
|
|
|
|
|
|
|
|
def _selectmessageencoder(ui):
|
|
|
# experimental config: cmdserver.message-encodings
|
|
|
encnames = ui.configlist(b'cmdserver', b'message-encodings')
|
|
|
for n in encnames:
|
|
|
f = _messageencoders.get(n)
|
|
|
if f:
|
|
|
return n, f
|
|
|
raise error.Abort(
|
|
|
b'no supported message encodings: %s' % b' '.join(encnames)
|
|
|
)
|
|
|
|
|
|
|
|
|
class server(object):
|
|
|
"""
|
|
|
Listens for commands on fin, runs them and writes the output on a channel
|
|
|
based stream to fout.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, ui, repo, fin, fout, prereposetups=None):
|
|
|
self.cwd = encoding.getcwd()
|
|
|
|
|
|
if repo:
|
|
|
# the ui here is really the repo ui so take its baseui so we don't
|
|
|
# end up with its local configuration
|
|
|
self.ui = repo.baseui
|
|
|
self.repo = repo
|
|
|
self.repoui = repo.ui
|
|
|
else:
|
|
|
self.ui = ui
|
|
|
self.repo = self.repoui = None
|
|
|
self._prereposetups = prereposetups
|
|
|
|
|
|
self.cdebug = channeledoutput(fout, b'd')
|
|
|
self.cerr = channeledoutput(fout, b'e')
|
|
|
self.cout = channeledoutput(fout, b'o')
|
|
|
self.cin = channeledinput(fin, fout, b'I')
|
|
|
self.cresult = channeledoutput(fout, b'r')
|
|
|
|
|
|
if self.ui.config(b'cmdserver', b'log') == b'-':
|
|
|
# switch log stream of server's ui to the 'd' (debug) channel
|
|
|
# (don't touch repo.ui as its lifetime is longer than the server)
|
|
|
self.ui = self.ui.copy()
|
|
|
setuplogging(self.ui, repo=None, fp=self.cdebug)
|
|
|
|
|
|
# TODO: add this to help/config.txt when stabilized
|
|
|
# ``channel``
|
|
|
# Use separate channel for structured output. (Command-server only)
|
|
|
self.cmsg = None
|
|
|
if ui.config(b'ui', b'message-output') == b'channel':
|
|
|
encname, encfn = _selectmessageencoder(ui)
|
|
|
self.cmsg = channeledmessage(fout, b'm', encname, encfn)
|
|
|
|
|
|
self.client = fin
|
|
|
|
|
|
def cleanup(self):
|
|
|
"""release and restore resources taken during server session"""
|
|
|
|
|
|
def _read(self, size):
|
|
|
if not size:
|
|
|
return b''
|
|
|
|
|
|
data = self.client.read(size)
|
|
|
|
|
|
# is the other end closed?
|
|
|
if not data:
|
|
|
raise EOFError
|
|
|
|
|
|
return data
|
|
|
|
|
|
def _readstr(self):
|
|
|
"""read a string from the channel
|
|
|
|
|
|
format:
|
|
|
data length (uint32), data
|
|
|
"""
|
|
|
length = struct.unpack(b'>I', self._read(4))[0]
|
|
|
if not length:
|
|
|
return b''
|
|
|
return self._read(length)
|
|
|
|
|
|
def _readlist(self):
|
|
|
"""read a list of NULL separated strings from the channel"""
|
|
|
s = self._readstr()
|
|
|
if s:
|
|
|
return s.split(b'\0')
|
|
|
else:
|
|
|
return []
|
|
|
|
|
|
def runcommand(self):
|
|
|
""" reads a list of \0 terminated arguments, executes
|
|
|
and writes the return code to the result channel """
|
|
|
from . import dispatch # avoid cycle
|
|
|
|
|
|
args = self._readlist()
|
|
|
|
|
|
# copy the uis so changes (e.g. --config or --verbose) don't
|
|
|
# persist between requests
|
|
|
copiedui = self.ui.copy()
|
|
|
uis = [copiedui]
|
|
|
if self.repo:
|
|
|
self.repo.baseui = copiedui
|
|
|
# clone ui without using ui.copy because this is protected
|
|
|
repoui = self.repoui.__class__(self.repoui)
|
|
|
repoui.copy = copiedui.copy # redo copy protection
|
|
|
uis.append(repoui)
|
|
|
self.repo.ui = self.repo.dirstate._ui = repoui
|
|
|
self.repo.invalidateall()
|
|
|
|
|
|
for ui in uis:
|
|
|
ui.resetstate()
|
|
|
# any kind of interaction must use server channels, but chg may
|
|
|
# replace channels by fully functional tty files. so nontty is
|
|
|
# enforced only if cin is a channel.
|
|
|
if not util.safehasattr(self.cin, b'fileno'):
|
|
|
ui.setconfig(b'ui', b'nontty', b'true', b'commandserver')
|
|
|
|
|
|
req = dispatch.request(
|
|
|
args[:],
|
|
|
copiedui,
|
|
|
self.repo,
|
|
|
self.cin,
|
|
|
self.cout,
|
|
|
self.cerr,
|
|
|
self.cmsg,
|
|
|
prereposetups=self._prereposetups,
|
|
|
)
|
|
|
|
|
|
try:
|
|
|
ret = dispatch.dispatch(req) & 255
|
|
|
self.cresult.write(struct.pack(b'>i', int(ret)))
|
|
|
finally:
|
|
|
# restore old cwd
|
|
|
if b'--cwd' in args:
|
|
|
os.chdir(self.cwd)
|
|
|
|
|
|
def getencoding(self):
|
|
|
""" writes the current encoding to the result channel """
|
|
|
self.cresult.write(encoding.encoding)
|
|
|
|
|
|
def serveone(self):
|
|
|
cmd = self.client.readline()[:-1]
|
|
|
if cmd:
|
|
|
handler = self.capabilities.get(cmd)
|
|
|
if handler:
|
|
|
handler(self)
|
|
|
else:
|
|
|
# clients are expected to check what commands are supported by
|
|
|
# looking at the servers capabilities
|
|
|
raise error.Abort(_(b'unknown command %s') % cmd)
|
|
|
|
|
|
return cmd != b''
|
|
|
|
|
|
capabilities = {b'runcommand': runcommand, b'getencoding': getencoding}
|
|
|
|
|
|
def serve(self):
|
|
|
hellomsg = b'capabilities: ' + b' '.join(sorted(self.capabilities))
|
|
|
hellomsg += b'\n'
|
|
|
hellomsg += b'encoding: ' + encoding.encoding
|
|
|
hellomsg += b'\n'
|
|
|
if self.cmsg:
|
|
|
hellomsg += b'message-encoding: %s\n' % self.cmsg.encoding
|
|
|
hellomsg += b'pid: %d' % procutil.getpid()
|
|
|
if util.safehasattr(os, b'getpgid'):
|
|
|
hellomsg += b'\n'
|
|
|
hellomsg += b'pgid: %d' % os.getpgid(0)
|
|
|
|
|
|
# write the hello msg in -one- chunk
|
|
|
self.cout.write(hellomsg)
|
|
|
|
|
|
try:
|
|
|
while self.serveone():
|
|
|
pass
|
|
|
except EOFError:
|
|
|
# we'll get here if the client disconnected while we were reading
|
|
|
# its request
|
|
|
return 1
|
|
|
|
|
|
return 0
|
|
|
|
|
|
|
|
|
def setuplogging(ui, repo=None, fp=None):
|
|
|
"""Set up server logging facility
|
|
|
|
|
|
If cmdserver.log is '-', log messages will be sent to the given fp.
|
|
|
It should be the 'd' channel while a client is connected, and otherwise
|
|
|
is the stderr of the server process.
|
|
|
"""
|
|
|
# developer config: cmdserver.log
|
|
|
logpath = ui.config(b'cmdserver', b'log')
|
|
|
if not logpath:
|
|
|
return
|
|
|
# developer config: cmdserver.track-log
|
|
|
tracked = set(ui.configlist(b'cmdserver', b'track-log'))
|
|
|
|
|
|
if logpath == b'-' and fp:
|
|
|
logger = loggingutil.fileobjectlogger(fp, tracked)
|
|
|
elif logpath == b'-':
|
|
|
logger = loggingutil.fileobjectlogger(ui.ferr, tracked)
|
|
|
else:
|
|
|
logpath = os.path.abspath(util.expandpath(logpath))
|
|
|
# developer config: cmdserver.max-log-files
|
|
|
maxfiles = ui.configint(b'cmdserver', b'max-log-files')
|
|
|
# developer config: cmdserver.max-log-size
|
|
|
maxsize = ui.configbytes(b'cmdserver', b'max-log-size')
|
|
|
vfs = vfsmod.vfs(os.path.dirname(logpath))
|
|
|
logger = loggingutil.filelogger(
|
|
|
vfs,
|
|
|
os.path.basename(logpath),
|
|
|
tracked,
|
|
|
maxfiles=maxfiles,
|
|
|
maxsize=maxsize,
|
|
|
)
|
|
|
|
|
|
targetuis = {ui}
|
|
|
if repo:
|
|
|
targetuis.add(repo.baseui)
|
|
|
targetuis.add(repo.ui)
|
|
|
for u in targetuis:
|
|
|
u.setlogger(b'cmdserver', logger)
|
|
|
|
|
|
|
|
|
class pipeservice(object):
|
|
|
def __init__(self, ui, repo, opts):
|
|
|
self.ui = ui
|
|
|
self.repo = repo
|
|
|
|
|
|
def init(self):
|
|
|
pass
|
|
|
|
|
|
def run(self):
|
|
|
ui = self.ui
|
|
|
# redirect stdio to null device so that broken extensions or in-process
|
|
|
# hooks will never cause corruption of channel protocol.
|
|
|
with ui.protectedfinout() as (fin, fout):
|
|
|
sv = server(ui, self.repo, fin, fout)
|
|
|
try:
|
|
|
return sv.serve()
|
|
|
finally:
|
|
|
sv.cleanup()
|
|
|
|
|
|
|
|
|
def _initworkerprocess():
|
|
|
# use a different process group from the master process, in order to:
|
|
|
# 1. make the current process group no longer "orphaned" (because the
|
|
|
# parent of this process is in a different process group while
|
|
|
# remains in a same session)
|
|
|
# according to POSIX 2.2.2.52, orphaned process group will ignore
|
|
|
# terminal-generated stop signals like SIGTSTP (Ctrl+Z), which will
|
|
|
# cause trouble for things like ncurses.
|
|
|
# 2. the client can use kill(-pgid, sig) to simulate terminal-generated
|
|
|
# SIGINT (Ctrl+C) and process-exit-generated SIGHUP. our child
|
|
|
# processes like ssh will be killed properly, without affecting
|
|
|
# unrelated processes.
|
|
|
os.setpgid(0, 0)
|
|
|
# change random state otherwise forked request handlers would have a
|
|
|
# same state inherited from parent.
|
|
|
random.seed()
|
|
|
|
|
|
|
|
|
def _serverequest(ui, repo, conn, createcmdserver, prereposetups):
|
|
|
fin = conn.makefile('rb')
|
|
|
fout = conn.makefile('wb')
|
|
|
sv = None
|
|
|
try:
|
|
|
sv = createcmdserver(repo, conn, fin, fout, prereposetups)
|
|
|
try:
|
|
|
sv.serve()
|
|
|
# handle exceptions that may be raised by command server. most of
|
|
|
# known exceptions are caught by dispatch.
|
|
|
except error.Abort as inst:
|
|
|
ui.error(_(b'abort: %s\n') % inst)
|
|
|
except IOError as inst:
|
|
|
if inst.errno != errno.EPIPE:
|
|
|
raise
|
|
|
except KeyboardInterrupt:
|
|
|
pass
|
|
|
finally:
|
|
|
sv.cleanup()
|
|
|
except: # re-raises
|
|
|
# also write traceback to error channel. otherwise client cannot
|
|
|
# see it because it is written to server's stderr by default.
|
|
|
if sv:
|
|
|
cerr = sv.cerr
|
|
|
else:
|
|
|
cerr = channeledoutput(fout, b'e')
|
|
|
cerr.write(encoding.strtolocal(traceback.format_exc()))
|
|
|
raise
|
|
|
finally:
|
|
|
fin.close()
|
|
|
try:
|
|
|
fout.close() # implicit flush() may cause another EPIPE
|
|
|
except IOError as inst:
|
|
|
if inst.errno != errno.EPIPE:
|
|
|
raise
|
|
|
|
|
|
|
|
|
class unixservicehandler(object):
|
|
|
"""Set of pluggable operations for unix-mode services
|
|
|
|
|
|
Almost all methods except for createcmdserver() are called in the main
|
|
|
process. You can't pass mutable resource back from createcmdserver().
|
|
|
"""
|
|
|
|
|
|
pollinterval = None
|
|
|
|
|
|
def __init__(self, ui):
|
|
|
self.ui = ui
|
|
|
|
|
|
def bindsocket(self, sock, address):
|
|
|
util.bindunixsocket(sock, address)
|
|
|
sock.listen(socket.SOMAXCONN)
|
|
|
self.ui.status(_(b'listening at %s\n') % address)
|
|
|
self.ui.flush() # avoid buffering of status message
|
|
|
|
|
|
def unlinksocket(self, address):
|
|
|
os.unlink(address)
|
|
|
|
|
|
def shouldexit(self):
|
|
|
"""True if server should shut down; checked per pollinterval"""
|
|
|
return False
|
|
|
|
|
|
def newconnection(self):
|
|
|
"""Called when main process notices new connection"""
|
|
|
|
|
|
def createcmdserver(self, repo, conn, fin, fout, prereposetups):
|
|
|
"""Create new command server instance; called in the process that
|
|
|
serves for the current connection"""
|
|
|
return server(self.ui, repo, fin, fout, prereposetups)
|
|
|
|
|
|
|
|
|
class unixforkingservice(object):
|
|
|
"""
|
|
|
Listens on unix domain socket and forks server per connection
|
|
|
"""
|
|
|
|
|
|
def __init__(self, ui, repo, opts, handler=None):
|
|
|
self.ui = ui
|
|
|
self.repo = repo
|
|
|
self.address = opts[b'address']
|
|
|
if not util.safehasattr(socket, b'AF_UNIX'):
|
|
|
raise error.Abort(_(b'unsupported platform'))
|
|
|
if not self.address:
|
|
|
raise error.Abort(_(b'no socket path specified with --address'))
|
|
|
self._servicehandler = handler or unixservicehandler(ui)
|
|
|
self._sock = None
|
|
|
self._mainipc = None
|
|
|
self._workeripc = None
|
|
|
self._oldsigchldhandler = None
|
|
|
self._workerpids = set() # updated by signal handler; do not iterate
|
|
|
self._socketunlinked = None
|
|
|
# experimental config: cmdserver.max-repo-cache
|
|
|
maxlen = ui.configint(b'cmdserver', b'max-repo-cache')
|
|
|
if maxlen < 0:
|
|
|
raise error.Abort(_(b'negative max-repo-cache size not allowed'))
|
|
|
self._repoloader = repocache.repoloader(ui, maxlen)
|
|
|
|
|
|
def init(self):
|
|
|
self._sock = socket.socket(socket.AF_UNIX)
|
|
|
# IPC channel from many workers to one main process; this is actually
|
|
|
# a uni-directional pipe, but is backed by a DGRAM socket so each
|
|
|
# message can be easily separated.
|
|
|
o = socket.socketpair(socket.AF_UNIX, socket.SOCK_DGRAM)
|
|
|
self._mainipc, self._workeripc = o
|
|
|
self._servicehandler.bindsocket(self._sock, self.address)
|
|
|
if util.safehasattr(procutil, b'unblocksignal'):
|
|
|
procutil.unblocksignal(signal.SIGCHLD)
|
|
|
o = signal.signal(signal.SIGCHLD, self._sigchldhandler)
|
|
|
self._oldsigchldhandler = o
|
|
|
self._socketunlinked = False
|
|
|
self._repoloader.start()
|
|
|
|
|
|
def _unlinksocket(self):
|
|
|
if not self._socketunlinked:
|
|
|
self._servicehandler.unlinksocket(self.address)
|
|
|
self._socketunlinked = True
|
|
|
|
|
|
def _cleanup(self):
|
|
|
signal.signal(signal.SIGCHLD, self._oldsigchldhandler)
|
|
|
self._sock.close()
|
|
|
self._mainipc.close()
|
|
|
self._workeripc.close()
|
|
|
self._unlinksocket()
|
|
|
self._repoloader.stop()
|
|
|
# don't kill child processes as they have active clients, just wait
|
|
|
self._reapworkers(0)
|
|
|
|
|
|
def run(self):
|
|
|
try:
|
|
|
self._mainloop()
|
|
|
finally:
|
|
|
self._cleanup()
|
|
|
|
|
|
def _mainloop(self):
|
|
|
exiting = False
|
|
|
h = self._servicehandler
|
|
|
selector = selectors.DefaultSelector()
|
|
|
selector.register(
|
|
|
self._sock, selectors.EVENT_READ, self._acceptnewconnection
|
|
|
)
|
|
|
selector.register(
|
|
|
self._mainipc, selectors.EVENT_READ, self._handlemainipc
|
|
|
)
|
|
|
while True:
|
|
|
if not exiting and h.shouldexit():
|
|
|
# clients can no longer connect() to the domain socket, so
|
|
|
# we stop queuing new requests.
|
|
|
# for requests that are queued (connect()-ed, but haven't been
|
|
|
# accept()-ed), handle them before exit. otherwise, clients
|
|
|
# waiting for recv() will receive ECONNRESET.
|
|
|
self._unlinksocket()
|
|
|
exiting = True
|
|
|
try:
|
|
|
events = selector.select(timeout=h.pollinterval)
|
|
|
except OSError as inst:
|
|
|
# selectors2 raises ETIMEDOUT if timeout exceeded while
|
|
|
# handling signal interrupt. That's probably wrong, but
|
|
|
# we can easily get around it.
|
|
|
if inst.errno != errno.ETIMEDOUT:
|
|
|
raise
|
|
|
events = []
|
|
|
if not events:
|
|
|
# only exit if we completed all queued requests
|
|
|
if exiting:
|
|
|
break
|
|
|
continue
|
|
|
for key, _mask in events:
|
|
|
key.data(key.fileobj, selector)
|
|
|
selector.close()
|
|
|
|
|
|
def _acceptnewconnection(self, sock, selector):
|
|
|
h = self._servicehandler
|
|
|
try:
|
|
|
conn, _addr = sock.accept()
|
|
|
except socket.error as inst:
|
|
|
if inst.args[0] == errno.EINTR:
|
|
|
return
|
|
|
raise
|
|
|
|
|
|
# Future improvement: On Python 3.7, maybe gc.freeze() can be used
|
|
|
# to prevent COW memory from being touched by GC.
|
|
|
# https://instagram-engineering.com/
|
|
|
# copy-on-write-friendly-python-garbage-collection-ad6ed5233ddf
|
|
|
pid = os.fork()
|
|
|
if pid:
|
|
|
try:
|
|
|
self.ui.log(
|
|
|
b'cmdserver', b'forked worker process (pid=%d)\n', pid
|
|
|
)
|
|
|
self._workerpids.add(pid)
|
|
|
h.newconnection()
|
|
|
finally:
|
|
|
conn.close() # release handle in parent process
|
|
|
else:
|
|
|
try:
|
|
|
selector.close()
|
|
|
sock.close()
|
|
|
self._mainipc.close()
|
|
|
self._runworker(conn)
|
|
|
conn.close()
|
|
|
self._workeripc.close()
|
|
|
os._exit(0)
|
|
|
except: # never return, hence no re-raises
|
|
|
try:
|
|
|
self.ui.traceback(force=True)
|
|
|
finally:
|
|
|
os._exit(255)
|
|
|
|
|
|
def _handlemainipc(self, sock, selector):
|
|
|
"""Process messages sent from a worker"""
|
|
|
try:
|
|
|
path = sock.recv(32768) # large enough to receive path
|
|
|
except socket.error as inst:
|
|
|
if inst.args[0] == errno.EINTR:
|
|
|
return
|
|
|
raise
|
|
|
self._repoloader.load(path)
|
|
|
|
|
|
def _sigchldhandler(self, signal, frame):
|
|
|
self._reapworkers(os.WNOHANG)
|
|
|
|
|
|
def _reapworkers(self, options):
|
|
|
while self._workerpids:
|
|
|
try:
|
|
|
pid, _status = os.waitpid(-1, options)
|
|
|
except OSError as inst:
|
|
|
if inst.errno == errno.EINTR:
|
|
|
continue
|
|
|
if inst.errno != errno.ECHILD:
|
|
|
raise
|
|
|
# no child processes at all (reaped by other waitpid()?)
|
|
|
self._workerpids.clear()
|
|
|
return
|
|
|
if pid == 0:
|
|
|
# no waitable child processes
|
|
|
return
|
|
|
self.ui.log(b'cmdserver', b'worker process exited (pid=%d)\n', pid)
|
|
|
self._workerpids.discard(pid)
|
|
|
|
|
|
def _runworker(self, conn):
|
|
|
signal.signal(signal.SIGCHLD, self._oldsigchldhandler)
|
|
|
_initworkerprocess()
|
|
|
h = self._servicehandler
|
|
|
try:
|
|
|
_serverequest(
|
|
|
self.ui,
|
|
|
self.repo,
|
|
|
conn,
|
|
|
h.createcmdserver,
|
|
|
prereposetups=[self._reposetup],
|
|
|
)
|
|
|
finally:
|
|
|
gc.collect() # trigger __del__ since worker process uses os._exit
|
|
|
|
|
|
def _reposetup(self, ui, repo):
|
|
|
if not repo.local():
|
|
|
return
|
|
|
|
|
|
class unixcmdserverrepo(repo.__class__):
|
|
|
def close(self):
|
|
|
super(unixcmdserverrepo, self).close()
|
|
|
try:
|
|
|
self._cmdserveripc.send(self.root)
|
|
|
except socket.error:
|
|
|
self.ui.log(
|
|
|
b'cmdserver', b'failed to send repo root to master\n'
|
|
|
)
|
|
|
|
|
|
repo.__class__ = unixcmdserverrepo
|
|
|
repo._cmdserveripc = self._workeripc
|
|
|
|
|
|
cachedrepo = self._repoloader.get(repo.root)
|
|
|
if cachedrepo is None:
|
|
|
return
|
|
|
repo.ui.log(b'repocache', b'repo from cache: %s\n', repo.root)
|
|
|
repocache.copycache(cachedrepo, repo)
|
|
|
|
