sshpeer: make instance attributes and methods internal

Peer types are supposed to conform to a formal interface defined by
peer.peerrepository and wireproto.wirepeer. Every "public" attribute on
*peer types makes it harder to understand what attributes are part
of the interface and what are instance specific.

This commit converts a number of "public" instance attributes and
methods on sshpeer to internal so they can't be confused to be part of
the peer API.

The URL-related instance attributes were introduced in 876333a295ff
in 2005. AFAICT most of them aren't used and could potentially be
removed. But I kept them around anyway.

I also reorded some code to make things slightly easier to read.

.. api::

   Rename attributes on sshpeer to reflect peer API

Differential Revision: https://phab.mercurial-scm.org/D331

mercurial/sshpeer.py

@@ -1,324 +1,325
 # sshpeer.py - ssh repository proxy class for mercurial
 #
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 #
 # 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 re
 
 from .i18n import _
 from . import (
     error,
     pycompat,
     util,
     wireproto,
 )
 
 def _serverquote(s):
     if not s:
         return s
     '''quote a string for the remote shell ... which we assume is sh'''
     if re.match('[a-zA-Z0-9@%_+=:,./-]*$', s):
         return s
     return "'%s'" % s.replace("'", "'\\''")
 
 def _forwardoutput(ui, pipe):
     """display all data currently available on pipe as remote output.
 
     This is non blocking."""
     s = util.readpipe(pipe)
     if s:
         for l in s.splitlines():
             ui.status(_("remote: "), l, '\n')
 
 class doublepipe(object):
     """Operate a side-channel pipe in addition of a main one
 
     The side-channel pipe contains server output to be forwarded to the user
     input. The double pipe will behave as the "main" pipe, but will ensure the
     content of the "side" pipe is properly processed while we wait for blocking
     call on the "main" pipe.
 
     If large amounts of data are read from "main", the forward will cease after
     the first bytes start to appear. This simplifies the implementation
     without affecting actual output of sshpeer too much as we rarely issue
     large read for data not yet emitted by the server.
 
     The main pipe is expected to be a 'bufferedinputpipe' from the util module
     that handle all the os specific bits. This class lives in this module
     because it focus on behavior specific to the ssh protocol."""
 
     def __init__(self, ui, main, side):
         self._ui = ui
         self._main = main
         self._side = side
 
     def _wait(self):
         """wait until some data are available on main or side
 
         return a pair of boolean (ismainready, issideready)
 
         (This will only wait for data if the setup is supported by `util.poll`)
         """
         if getattr(self._main, 'hasbuffer', False): # getattr for classic pipe
             return (True, True) # main has data, assume side is worth poking at.
         fds = [self._main.fileno(), self._side.fileno()]
         try:
             act = util.poll(fds)
         except NotImplementedError:
             # non supported yet case, assume all have data.
             act = fds
         return (self._main.fileno() in act, self._side.fileno() in act)
 
     def write(self, data):
         return self._call('write', data)
 
     def read(self, size):
         r = self._call('read', size)
         if size != 0 and not r:
             # We've observed a condition that indicates the
             # stdout closed unexpectedly. Check stderr one
             # more time and snag anything that's there before
             # letting anyone know the main part of the pipe
             # closed prematurely.
             _forwardoutput(self._ui, self._side)
         return r
 
     def readline(self):
         return self._call('readline')
 
     def _call(self, methname, data=None):
         """call <methname> on "main", forward output of "side" while blocking
         """
         # data can be '' or 0
         if (data is not None and not data) or self._main.closed:
             _forwardoutput(self._ui, self._side)
             return ''
         while True:
             mainready, sideready = self._wait()
             if sideready:
                 _forwardoutput(self._ui, self._side)
             if mainready:
                 meth = getattr(self._main, methname)
                 if data is None:
                     return meth()
                 else:
                     return meth(data)
 
     def close(self):
         return self._main.close()
 
     def flush(self):
         return self._main.flush()
 
 class sshpeer(wireproto.wirepeer):
     def __init__(self, ui, path, create=False):
         self._url = path
         self.ui = ui
-        self.pipeo = self.pipei = self.pipee = None
+        self._pipeo = self._pipei = self._pipee = None
 
         u = util.url(path, parsequery=False, parsefragment=False)
         if u.scheme != 'ssh' or not u.host or u.path is None:
             self._abort(error.RepoError(_("couldn't parse location %s") % path))
 
         util.checksafessh(path)
 
-        self.user = u.user
         if u.passwd is not None:
             self._abort(error.RepoError(_("password in URL not supported")))
-        self.host = u.host
-        self.port = u.port
-        self.path = u.path or "."
+
+        self._user = u.user
+        self._host = u.host
+        self._port = u.port
+        self._path = u.path or '.'
 
         sshcmd = self.ui.config("ui", "ssh")
         remotecmd = self.ui.config("ui", "remotecmd")
 
-        args = util.sshargs(sshcmd, self.host, self.user, self.port)
+        args = util.sshargs(sshcmd, self._host, self._user, self._port)
 
         if create:
             cmd = '%s %s %s' % (sshcmd, args,
                 util.shellquote("%s init %s" %
-                    (_serverquote(remotecmd), _serverquote(self.path))))
+                    (_serverquote(remotecmd), _serverquote(self._path))))
             ui.debug('running %s\n' % cmd)
             res = ui.system(cmd, blockedtag='sshpeer')
             if res != 0:
                 self._abort(error.RepoError(_("could not create remote repo")))
 
         self._validaterepo(sshcmd, args, remotecmd)
 
     def url(self):
         return self._url
 
     def _validaterepo(self, sshcmd, args, remotecmd):
         # cleanup up previous run
-        self.cleanup()
+        self._cleanup()
 
         cmd = '%s %s %s' % (sshcmd, args,
             util.shellquote("%s -R %s serve --stdio" %
-                (_serverquote(remotecmd), _serverquote(self.path))))
+                (_serverquote(remotecmd), _serverquote(self._path))))
         self.ui.debug('running %s\n' % cmd)
         cmd = util.quotecommand(cmd)
 
-        # while self.subprocess isn't used, having it allows the subprocess to
+        # while self._subprocess isn't used, having it allows the subprocess to
         # to clean up correctly later
         #
         # no buffer allow the use of 'select'
         # feel free to remove buffering and select usage when we ultimately
         # move to threading.
         sub = util.popen4(cmd, bufsize=0)
-        self.pipeo, self.pipei, self.pipee, self.subprocess = sub
+        self._pipeo, self._pipei, self._pipee, self._subprocess = sub
 
-        self.pipei = util.bufferedinputpipe(self.pipei)
-        self.pipei = doublepipe(self.ui, self.pipei, self.pipee)
-        self.pipeo = doublepipe(self.ui, self.pipeo, self.pipee)
+        self._pipei = util.bufferedinputpipe(self._pipei)
+        self._pipei = doublepipe(self.ui, self._pipei, self._pipee)
+        self._pipeo = doublepipe(self.ui, self._pipeo, self._pipee)
 
         # skip any noise generated by remote shell
         self._callstream("hello")
         r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
         lines = ["", "dummy"]
         max_noise = 500
         while lines[-1] and max_noise:
             l = r.readline()
-            self.readerr()
+            self._readerr()
             if lines[-1] == "1\n" and l == "\n":
                 break
             if l:
                 self.ui.debug("remote: ", l)
             lines.append(l)
             max_noise -= 1
         else:
             self._abort(error.RepoError(_('no suitable response from '
                                           'remote hg')))
 
         self._caps = set()
         for l in reversed(lines):
             if l.startswith("capabilities:"):
                 self._caps.update(l[:-1].split(":")[1].split())
                 break
 
     def _capabilities(self):
         return self._caps
 
-    def readerr(self):
-        _forwardoutput(self.ui, self.pipee)
+    def _readerr(self):
+        _forwardoutput(self.ui, self._pipee)
 
     def _abort(self, exception):
-        self.cleanup()
+        self._cleanup()
         raise exception
 
-    def cleanup(self):
-        if self.pipeo is None:
+    def _cleanup(self):
+        if self._pipeo is None:
             return
-        self.pipeo.close()
-        self.pipei.close()
+        self._pipeo.close()
+        self._pipei.close()
         try:
             # read the error descriptor until EOF
-            for l in self.pipee:
+            for l in self._pipee:
                 self.ui.status(_("remote: "), l)
         except (IOError, ValueError):
             pass
-        self.pipee.close()
+        self._pipee.close()
 
-    __del__ = cleanup
+    __del__ = _cleanup
 
     def _submitbatch(self, req):
         rsp = self._callstream("batch", cmds=wireproto.encodebatchcmds(req))
         available = self._getamount()
         # TODO this response parsing is probably suboptimal for large
         # batches with large responses.
         toread = min(available, 1024)
         work = rsp.read(toread)
         available -= toread
         chunk = work
         while chunk:
             while ';' in work:
                 one, work = work.split(';', 1)
                 yield wireproto.unescapearg(one)
             toread = min(available, 1024)
             chunk = rsp.read(toread)
             available -= toread
             work += chunk
         yield wireproto.unescapearg(work)
 
     def _callstream(self, cmd, **args):
         args = pycompat.byteskwargs(args)
         self.ui.debug("sending %s command\n" % cmd)
-        self.pipeo.write("%s\n" % cmd)
+        self._pipeo.write("%s\n" % cmd)
         _func, names = wireproto.commands[cmd]
         keys = names.split()
         wireargs = {}
         for k in keys:
             if k == '*':
                 wireargs['*'] = args
                 break
             else:
                 wireargs[k] = args[k]
                 del args[k]
         for k, v in sorted(wireargs.iteritems()):
-            self.pipeo.write("%s %d\n" % (k, len(v)))
+            self._pipeo.write("%s %d\n" % (k, len(v)))
             if isinstance(v, dict):
                 for dk, dv in v.iteritems():
-                    self.pipeo.write("%s %d\n" % (dk, len(dv)))
-                    self.pipeo.write(dv)
+                    self._pipeo.write("%s %d\n" % (dk, len(dv)))
+                    self._pipeo.write(dv)
             else:
-                self.pipeo.write(v)
-        self.pipeo.flush()
+                self._pipeo.write(v)
+        self._pipeo.flush()
 
-        return self.pipei
+        return self._pipei
 
     def _callcompressable(self, cmd, **args):
         return self._callstream(cmd, **args)
 
     def _call(self, cmd, **args):
         self._callstream(cmd, **args)
         return self._recv()
 
     def _callpush(self, cmd, fp, **args):
         r = self._call(cmd, **args)
         if r:
             return '', r
         for d in iter(lambda: fp.read(4096), ''):
             self._send(d)
         self._send("", flush=True)
         r = self._recv()
         if r:
             return '', r
         return self._recv(), ''
 
     def _calltwowaystream(self, cmd, fp, **args):
         r = self._call(cmd, **args)
         if r:
             # XXX needs to be made better
             raise error.Abort(_('unexpected remote reply: %s') % r)
         for d in iter(lambda: fp.read(4096), ''):
             self._send(d)
         self._send("", flush=True)
-        return self.pipei
+        return self._pipei
 
     def _getamount(self):
-        l = self.pipei.readline()
+        l = self._pipei.readline()
         if l == '\n':
-            self.readerr()
+            self._readerr()
             msg = _('check previous remote output')
             self._abort(error.OutOfBandError(hint=msg))
-        self.readerr()
+        self._readerr()
         try:
             return int(l)
         except ValueError:
             self._abort(error.ResponseError(_("unexpected response:"), l))
 
     def _recv(self):
-        return self.pipei.read(self._getamount())
+        return self._pipei.read(self._getamount())
 
     def _send(self, data, flush=False):
-        self.pipeo.write("%d\n" % len(data))
+        self._pipeo.write("%d\n" % len(data))
         if data:
-            self.pipeo.write(data)
+            self._pipeo.write(data)
         if flush:
-            self.pipeo.flush()
-        self.readerr()
+            self._pipeo.flush()
+        self._readerr()
 
 instance = sshpeer