httprepo: use caps instead of between for compat check

We usually query the capabilities at some point anyway so this way the first roundtrip
actually does useful work.

mercurial/httprepo.py

@@ -1,202 +1,211 b''
 # httprepo.py - HTTP repository proxy classes for mercurial
 #
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 # Copyright 2006 Vadim Gelfer <[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 node import nullid
 from i18n import _
 import changegroup, statichttprepo, error, url, util, wireproto
 import os, urllib, urllib2, urlparse, zlib, httplib
 import errno, socket
 
 def zgenerator(f):
     zd = zlib.decompressobj()
     try:
         for chunk in util.filechunkiter(f):
             while chunk:
                 yield zd.decompress(chunk, 2**18)
                 chunk = zd.unconsumed_tail
     except httplib.HTTPException:
         raise IOError(None, _('connection ended unexpectedly'))
     yield zd.flush()
 
 class httprepository(wireproto.wirerepository):
     def __init__(self, ui, path):
         self.path = path
         self.caps = None
         self.handler = None
         scheme, netloc, urlpath, query, frag = urlparse.urlsplit(path)
         if query or frag:
             raise util.Abort(_('unsupported URL component: "%s"') %
                              (query or frag))
 
         # urllib cannot handle URLs with embedded user or passwd
         self._url, authinfo = url.getauthinfo(path)
 
         self.ui = ui
         self.ui.debug('using %s\n' % self._url)
 
         self.urlopener = url.opener(ui, authinfo)
 
     def __del__(self):
         for h in self.urlopener.handlers:
             h.close()
             if hasattr(h, "close_all"):
                 h.close_all()
 
     def url(self):
         return self.path
 
     # look up capabilities only when needed
 
+    def _fetchcaps(self):
+        self.caps = set(self._call('capabilities').split())
+
     def get_caps(self):
         if self.caps is None:
             try:
-                self.caps = set(self._call('capabilities').split())
+                self._fetchcaps()
             except error.RepoError:
                 self.caps = set()
             self.ui.debug('capabilities: %s\n' %
                           (' '.join(self.caps or ['none'])))
         return self.caps
 
     capabilities = property(get_caps)
 
     def lock(self):
         raise util.Abort(_('operation not supported over http'))
 
     def _callstream(self, cmd, **args):
         if cmd == 'pushkey':
             args['data'] = ''
         data = args.pop('data', None)
         headers = args.pop('headers', {})
         self.ui.debug("sending %s command\n" % cmd)
         q = [('cmd', cmd)] + sorted(args.items())
         qs = '?%s' % urllib.urlencode(q)
         cu = "%s%s" % (self._url, qs)
         req = urllib2.Request(cu, data, headers)
         if data is not None:
             # len(data) is broken if data doesn't fit into Py_ssize_t
             # add the header ourself to avoid OverflowError
             size = data.__len__()
             self.ui.debug("sending %s bytes\n" % size)
             req.add_unredirected_header('Content-Length', '%d' % size)
         try:
             resp = self.urlopener.open(req)
         except urllib2.HTTPError, inst:
             if inst.code == 401:
                 raise util.Abort(_('authorization failed'))
             raise
         except httplib.HTTPException, inst:
             self.ui.debug('http error while sending %s command\n' % cmd)
             self.ui.traceback()
             raise IOError(None, inst)
         except IndexError:
             # this only happens with Python 2.3, later versions raise URLError
             raise util.Abort(_('http error, possibly caused by proxy setting'))
         # record the url we got redirected to
         resp_url = resp.geturl()
         if resp_url.endswith(qs):
             resp_url = resp_url[:-len(qs)]
         if self._url.rstrip('/') != resp_url.rstrip('/'):
             self.ui.status(_('real URL is %s\n') % resp_url)
         self._url = resp_url
         try:
             proto = resp.getheader('content-type')
         except AttributeError:
             proto = resp.headers['content-type']
 
         safeurl = url.hidepassword(self._url)
         # accept old "text/plain" and "application/hg-changegroup" for now
         if not (proto.startswith('application/mercurial-') or
                 proto.startswith('text/plain') or
                 proto.startswith('application/hg-changegroup')):
             self.ui.debug("requested URL: '%s'\n" % url.hidepassword(cu))
             raise error.RepoError(
                 _("'%s' does not appear to be an hg repository:\n"
                   "---%%<--- (%s)\n%s\n---%%<---\n")
                 % (safeurl, proto, resp.read()))
 
         if proto.startswith('application/mercurial-'):
             try:
                 version = proto.split('-', 1)[1]
                 version_info = tuple([int(n) for n in version.split('.')])
             except ValueError:
                 raise error.RepoError(_("'%s' sent a broken Content-Type "
                                         "header (%s)") % (safeurl, proto))
             if version_info > (0, 1):
                 raise error.RepoError(_("'%s' uses newer protocol %s") %
                                       (safeurl, version))
 
         return resp
 
     def _call(self, cmd, **args):
         fp = self._callstream(cmd, **args)
         try:
             return fp.read()
         finally:
             # if using keepalive, allow connection to be reused
             fp.close()
 
     def _callpush(self, cmd, cg, **args):
         # have to stream bundle to a temp file because we do not have
         # http 1.1 chunked transfer.
 
         type = ""
         types = self.capable('unbundle')
         # servers older than d1b16a746db6 will send 'unbundle' as a
         # boolean capability
         try:
             types = types.split(',')
         except AttributeError:
             types = [""]
         if types:
             for x in types:
                 if x in changegroup.bundletypes:
                     type = x
                     break
 
         tempname = changegroup.writebundle(cg, None, type)
         fp = url.httpsendfile(self.ui, tempname, "rb")
         headers = {'Content-Type': 'application/mercurial-0.1'}
 
         try:
             try:
                 r = self._call(cmd, data=fp, headers=headers, **args)
                 return r.split('\n', 1)
             except socket.error, err:
                 if err.args[0] in (errno.ECONNRESET, errno.EPIPE):
                     raise util.Abort(_('push failed: %s') % err.args[1])
                 raise util.Abort(err.args[1])
         finally:
             fp.close()
             os.unlink(tempname)
 
     def _abort(self, exception):
         raise exception
 
     def _decompress(self, stream):
         return util.chunkbuffer(zgenerator(stream))
 
 class httpsrepository(httprepository):
     def __init__(self, ui, path):
         if not url.has_https:
             raise util.Abort(_('Python support for SSL and HTTPS '
                                'is not installed'))
         httprepository.__init__(self, ui, path)
 
 def instance(ui, path, create):
     if create:
         raise util.Abort(_('cannot create new http repository'))
     try:
         if path.startswith('https:'):
             inst = httpsrepository(ui, path)
         else:
             inst = httprepository(ui, path)
-        inst.between([(nullid, nullid)])
+        try:
+            # Try to do useful work when checking compatibility.
+            # Usually saves a roundtrip since we want the caps anyway.
+            inst._fetchcaps()
+        except error.RepoError:
+            # No luck, try older compatibility check.
+            inst.between([(nullid, nullid)])
         return inst
     except error.RepoError:
         ui.note('(falling back to static-http)\n')
         return statichttprepo.instance(ui, "static-" + path, create)

tests/test-http-proxy.t

@@ -1,124 +1,119 b''
 
   $ hg init a
   $ cd a
   $ echo a > a
   $ hg ci -Ama -d '1123456789 0'
   adding a
   $ hg --config server.uncompressed=True serve -p $HGPORT -d --pid-file=hg.pid
   $ cat hg.pid >> $DAEMON_PIDS
   $ cd ..
   $ ("$TESTDIR/tinyproxy.py" $HGPORT1 localhost >proxy.log 2>&1 </dev/null &
   $ echo $! > proxy.pid)
   $ cat proxy.pid >> $DAEMON_PIDS
   $ sleep 2
 
 url for proxy, stream
 
   $ http_proxy=http://localhost:$HGPORT1/ hg --config http_proxy.always=True clone --uncompressed http://localhost:$HGPORT/ b
   streaming all changes
   3 files to transfer, 303 bytes of data
   transferred * bytes in * seconds (*B/sec) (glob)
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd b
   $ hg verify
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   1 files, 1 changesets, 1 total revisions
   $ cd ..
 
 url for proxy, pull
 
   $ http_proxy=http://localhost:$HGPORT1/ hg --config http_proxy.always=True clone http://localhost:$HGPORT/ b-pull
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cd b-pull
   $ hg verify
   checking changesets
   checking manifests
   crosschecking files in changesets and manifests
   checking files
   1 files, 1 changesets, 1 total revisions
   $ cd ..
 
 host:port for proxy
 
   $ http_proxy=localhost:$HGPORT1 hg clone --config http_proxy.always=True http://localhost:$HGPORT/ c
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 proxy url with user name and password
 
   $ http_proxy=http://user:passwd@localhost:$HGPORT1 hg clone --config http_proxy.always=True http://localhost:$HGPORT/ d
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 url with user name and password
 
   $ http_proxy=http://user:passwd@localhost:$HGPORT1 hg clone --config http_proxy.always=True http://user:passwd@localhost:$HGPORT/ e
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
 
 bad host:port for proxy
 
   $ http_proxy=localhost:$HGPORT2 hg clone --config http_proxy.always=True http://localhost:$HGPORT/ f
   abort: error: Connection refused
   [255]
 
 do not use the proxy if it is in the no list
 
   $ http_proxy=localhost:$HGPORT1 hg clone --config http_proxy.no=localhost http://localhost:$HGPORT/ g
   requesting all changes
   adding changesets
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
   updating to branch default
   1 files updated, 0 files merged, 0 files removed, 0 files unresolved
   $ cat proxy.log
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=between&pairs=0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=stream_out HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=between&pairs=0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
+  * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=heads HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=changegroup&roots=0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
+  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=between&pairs=0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=heads HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=changegroup&roots=0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
+  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=between&pairs=0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=heads HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=changegroup&roots=0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
+  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=between&pairs=0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=heads HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=changegroup&roots=0000000000000000000000000000000000000000 HTTP/1.1" - - (glob)
-  * - - [*] "GET http://localhost:$HGPORT/?cmd=capabilities HTTP/1.1" - - (glob)
   * - - [*] "GET http://localhost:$HGPORT/?cmd=listkeys&namespace=bookmarks HTTP/1.1" - - (glob)
 

tests/test-schemes.t

@@ -1,45 +1,45 b''
 
   $ cat <<EOF >> $HGRCPATH
   > [extensions]
   > schemes=
   > 
   > [schemes]
   > l = http://localhost:$HGPORT/
   > parts = http://{1}:$HGPORT/
   > z = file:\$PWD/
   > EOF
   $ hg init test
   $ cd test
   $ echo a > a
   $ hg ci -Am initial
   adding a
   $ hg serve -n test -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log
   $ cat hg.pid >> $DAEMON_PIDS
   $ hg incoming l://
   comparing with l://
   searching for changes
   no changes found
   [1]
 
 check that {1} syntax works
 
   $ hg incoming --debug parts://localhost
   using http://localhost:$HGPORT/
-  sending between command
+  sending capabilities command
   comparing with parts://localhost
   sending heads command
   searching for changes
   no changes found
   [1]
 
 check that paths are expanded
 
   $ PWD=`pwd` hg incoming z://
   comparing with z://
   searching for changes
   no changes found
   [1]
 
 errors
 
   $ cat errors.log