wireproto: reimplement dispatch() for version 2 server

The code is minimal. I'm trying to create a cleaner break between
version 1 and version 2 server code.

Differential Revision: https://phab.mercurial-scm.org/D3397

mercurial/wireproto.py

@@ -69,20 +69,10 b' def getdispatchrepo(repo, proto, command'
 def dispatch(repo, proto, command):
     repo = getdispatchrepo(repo, proto, command)
 
-    transportversion = wireprototypes.TRANSPORTS[proto.name]['version']
-    commandtable = commandsv2 if transportversion == 2 else commands
-    func, spec = commandtable[command]
-
+    func, spec = commands[command]
     args = proto.getargs(spec)
 
-    # Version 1 protocols define arguments as a list. Version 2 uses a dict.
-    if isinstance(args, list):
         return func(repo, proto, *args)
-    elif isinstance(args, dict):
-        return func(repo, proto, **args)
-    else:
-        raise error.ProgrammingError('unexpected type returned from '
-                                     'proto.getargs(): %s' % type(args))
 
 def options(cmd, keys, others):
     opts = {}

mercurial/wireprotov2server.py

@@ -296,7 +296,7 b' def _httpv2runcommand(ui, repo, req, res'
             res.setbodybytes(_('command in frame must match command in URL'))
             return True
 
-    rsp = wireproto.dispatch(repo, proto, command['command'])
+    rsp = dispatch(repo, proto, command['command'])
 
     res.status = b'200 OK'
     res.headers[b'Content-Type'] = FRAMINGTYPE
@@ -328,6 +328,17 b' def _httpv2runcommand(ui, repo, req, res'
         raise error.ProgrammingError('unhandled event from reactor: %s' %
                                      action)
 
+def getdispatchrepo(repo, proto, command):
+    return repo.filtered('served')
+
+def dispatch(repo, proto, command):
+    repo = getdispatchrepo(repo, proto, command)
+
+    func, spec = wireproto.commandsv2[command]
+    args = proto.getargs(spec)
+
+    return func(repo, proto, **args)
+
 @zi.implementer(wireprototypes.baseprotocolhandler)
 class httpv2protocolhandler(object):
     def __init__(self, req, ui, args=None):