wsgicgi: call close() on iterable to avoid resource leaks
Quoting PEP 333 (WSGI):
"If the iterable returned by the application has a close() method, the server
or gateway must call that method upon completion of the current request,
whether the request was completed normally, or terminated early due to
an error. (This is to support resource release by the application.
This protocol is intended to complement PEP 325's generator support,
and other common iterables with close() methods."
# sshrepo.py - ssh repository proxy class for mercurial
#
# Copyright 2005, 2006 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 node import bin, hex
from i18n import _
import repo, util, error, encoding
import re, urllib
class remotelock(object):
def __init__(self, repo):
self.repo = repo
def release(self):
self.repo.unlock()
self.repo = None
def __del__(self):
if self.repo:
self.release()
class sshrepository(repo.repository):
def __init__(self, ui, path, create=0):
self._url = path
self.ui = ui
m = re.match(r'^ssh://(([^@]+)@)?([^:/]+)(:(\d+))?(/(.*))?$', path)
if not m:
self.abort(error.RepoError(_("couldn't parse location %s") % path))
self.user = m.group(2)
self.host = m.group(3)
self.port = m.group(5)
self.path = m.group(7) or "."
sshcmd = self.ui.config("ui", "ssh", "ssh")
remotecmd = self.ui.config("ui", "remotecmd", "hg")
args = util.sshargs(sshcmd, self.host, self.user, self.port)
if create:
cmd = '%s %s "%s init %s"'
cmd = cmd % (sshcmd, args, remotecmd, self.path)
ui.note(_('running %s\n') % cmd)
res = util.system(cmd)
if res != 0:
self.abort(error.RepoError(_("could not create remote repo")))
self.validate_repo(ui, sshcmd, args, remotecmd)
def url(self):
return self._url
def validate_repo(self, ui, sshcmd, args, remotecmd):
# cleanup up previous run
self.cleanup()
cmd = '%s %s "%s -R %s serve --stdio"'
cmd = cmd % (sshcmd, args, remotecmd, self.path)
cmd = util.quotecommand(cmd)
ui.note(_('running %s\n') % cmd)
self.pipeo, self.pipei, self.pipee = util.popen3(cmd)
# skip any noise generated by remote shell
self.do_cmd("hello")
r = self.do_cmd("between", pairs=("%s-%s" % ("0"*40, "0"*40)))
lines = ["", "dummy"]
max_noise = 500
while lines[-1] and max_noise:
l = r.readline()
self.readerr()
if lines[-1] == "1\n" and l == "\n":
break
if l:
ui.debug("remote: ", l)
lines.append(l)
max_noise -= 1
else:
self.abort(error.RepoError(_("no suitable response from remote hg")))
self.capabilities = set()
for l in reversed(lines):
if l.startswith("capabilities:"):
self.capabilities.update(l[:-1].split(":")[1].split())
break
def readerr(self):
while 1:
size = util.fstat(self.pipee).st_size
if size == 0:
break
l = self.pipee.readline()
if not l:
break
self.ui.status(_("remote: "), l)
def abort(self, exception):
self.cleanup()
raise exception
def cleanup(self):
try:
self.pipeo.close()
self.pipei.close()
# read the error descriptor until EOF
for l in self.pipee:
self.ui.status(_("remote: "), l)
self.pipee.close()
except:
pass
__del__ = cleanup
def do_cmd(self, cmd, **args):
self.ui.debug("sending %s command\n" % cmd)
self.pipeo.write("%s\n" % cmd)
for k, v in args.iteritems():
self.pipeo.write("%s %d\n" % (k, len(v)))
self.pipeo.write(v)
self.pipeo.flush()
return self.pipei
def call(self, cmd, **args):
self.do_cmd(cmd, **args)
return self._recv()
def _recv(self):
l = self.pipei.readline()
self.readerr()
try:
l = int(l)
except:
self.abort(error.ResponseError(_("unexpected response:"), l))
return self.pipei.read(l)
def _send(self, data, flush=False):
self.pipeo.write("%d\n" % len(data))
if data:
self.pipeo.write(data)
if flush:
self.pipeo.flush()
self.readerr()
def lock(self):
self.call("lock")
return remotelock(self)
def unlock(self):
self.call("unlock")
def lookup(self, key):
self.requirecap('lookup', _('look up remote revision'))
d = self.call("lookup", key=key)
success, data = d[:-1].split(" ", 1)
if int(success):
return bin(data)
else:
self.abort(error.RepoError(data))
def heads(self):
d = self.call("heads")
try:
return map(bin, d[:-1].split(" "))
except:
self.abort(error.ResponseError(_("unexpected response:"), d))
def branchmap(self):
d = self.call("branchmap")
try:
branchmap = {}
for branchpart in d.splitlines():
branchheads = branchpart.split(' ')
branchname = urllib.unquote(branchheads[0])
# Earlier servers (1.3.x) send branch names in (their) local
# charset. The best we can do is assume it's identical to our
# own local charset, in case it's not utf-8.
try:
branchname.decode('utf-8')
except UnicodeDecodeError:
branchname = encoding.fromlocal(branchname)
branchheads = [bin(x) for x in branchheads[1:]]
branchmap[branchname] = branchheads
return branchmap
except:
raise error.ResponseError(_("unexpected response:"), d)
def branches(self, nodes):
n = " ".join(map(hex, nodes))
d = self.call("branches", nodes=n)
try:
br = [tuple(map(bin, b.split(" "))) for b in d.splitlines()]
return br
except:
self.abort(error.ResponseError(_("unexpected response:"), d))
def between(self, pairs):
n = " ".join(["-".join(map(hex, p)) for p in pairs])
d = self.call("between", pairs=n)
try:
p = [l and map(bin, l.split(" ")) or [] for l in d.splitlines()]
return p
except:
self.abort(error.ResponseError(_("unexpected response:"), d))
def changegroup(self, nodes, kind):
n = " ".join(map(hex, nodes))
return self.do_cmd("changegroup", roots=n)
def changegroupsubset(self, bases, heads, kind):
self.requirecap('changegroupsubset', _('look up remote changes'))
bases = " ".join(map(hex, bases))
heads = " ".join(map(hex, heads))
return self.do_cmd("changegroupsubset", bases=bases, heads=heads)
def unbundle(self, cg, heads, source):
d = self.call("unbundle", heads=' '.join(map(hex, heads)))
if d:
# remote may send "unsynced changes"
self.abort(error.RepoError(_("push refused: %s") % d))
while 1:
d = cg.read(4096)
if not d:
break
self._send(d)
self._send("", flush=True)
r = self._recv()
if r:
# remote may send "unsynced changes"
self.abort(error.RepoError(_("push failed: %s") % r))
r = self._recv()
try:
return int(r)
except:
self.abort(error.ResponseError(_("unexpected response:"), r))
def addchangegroup(self, cg, source, url):
d = self.call("addchangegroup")
if d:
self.abort(error.RepoError(_("push refused: %s") % d))
while 1:
d = cg.read(4096)
if not d:
break
self.pipeo.write(d)
self.readerr()
self.pipeo.flush()
self.readerr()
r = self._recv()
if not r:
return 1
try:
return int(r)
except:
self.abort(error.ResponseError(_("unexpected response:"), r))
def stream_out(self):
return self.do_cmd('stream_out')
instance = sshrepository