wireprotoserver: split ssh protocol handler and server

wireprotoserver: split ssh protocol handler and server

We want to formalize the interface for protocol handlers. Today,
server functionality (which is domain specific) is interleaved
with protocol handling functionality (which conforms to a generic
interface) in the sshserver class.

This commit splits the ssh protocol handling code out of the
sshserver class.

Differential Revision: https://phab.mercurial-scm.org/D2080

--- a/mercurial/wireprotoserver.py	Wed Feb 07 21:04:54 2018 -0800
+++ b/mercurial/wireprotoserver.py	Wed Feb 07 20:17:05 2018 -0800
@@ -354,19 +354,12 @@
     fout.write(b'\n')
     fout.flush()
 
-class sshserver(baseprotocolhandler):
-    def __init__(self, ui, repo):
+class sshv1protocolhandler(baseprotocolhandler):
+    """Handler for requests services via version 1 of SSH protocol."""
+    def __init__(self, ui, fin, fout):
         self._ui = ui
-        self._repo = repo
-        self._fin = ui.fin
-        self._fout = ui.fout
-
-        hook.redirect(True)
-        ui.fout = repo.ui.fout = ui.ferr
-
-        # Prevent insertion/deletion of CRs
-        util.setbinary(self._fin)
-        util.setbinary(self._fout)
+        self._fin = fin
+        self._fout = fout
 
     @property
     def name(self):
@@ -403,6 +396,26 @@
     def redirect(self):
         pass
 
+    def _client(self):
+        client = encoding.environ.get('SSH_CLIENT', '').split(' ', 1)[0]
+        return 'remote:ssh:' + client
+
+class sshserver(object):
+    def __init__(self, ui, repo):
+        self._ui = ui
+        self._repo = repo
+        self._fin = ui.fin
+        self._fout = ui.fout
+
+        hook.redirect(True)
+        ui.fout = repo.ui.fout = ui.ferr
+
+        # Prevent insertion/deletion of CRs
+        util.setbinary(self._fin)
+        util.setbinary(self._fout)
+
+        self._proto = sshv1protocolhandler(self._ui, self._fin, self._fout)
+
     def serve_forever(self):
         while self.serve_one():
             pass
@@ -410,8 +423,8 @@
 
     def serve_one(self):
         cmd = self._fin.readline()[:-1]
-        if cmd and wireproto.commands.commandavailable(cmd, self):
-            rsp = wireproto.dispatch(self._repo, self, cmd)
+        if cmd and wireproto.commands.commandavailable(cmd, self._proto):
+            rsp = wireproto.dispatch(self._repo, self._proto, cmd)
 
             if isinstance(rsp, bytes):
                 _sshv1respondbytes(self._fout, rsp)
@@ -432,7 +445,3 @@
         elif cmd:
             _sshv1respondbytes(self._fout, b'')
         return cmd != ''
-
-    def _client(self):
-        client = encoding.environ.get('SSH_CLIENT', '').split(' ', 1)[0]
-        return 'remote:ssh:' + client

--- a/tests/sshprotoext.py	Wed Feb 07 21:04:54 2018 -0800
+++ b/tests/sshprotoext.py	Wed Feb 07 20:17:05 2018 -0800
@@ -48,7 +48,7 @@
         wireprotoserver._sshv1respondbytes(self._fout, b'')
         l = self._fin.readline()
         assert l == b'between\n'
-        rsp = wireproto.dispatch(self._repo, self, b'between')
+        rsp = wireproto.dispatch(self._repo, self._proto, b'between')
         wireprotoserver._sshv1respondbytes(self._fout, rsp)
 
         super(prehelloserver, self).serve_forever()
@@ -73,7 +73,7 @@
 
         # Send the upgrade response.
         self._fout.write(b'upgraded %s %s\n' % (token, name))
-        servercaps = wireproto.capabilities(self._repo, self)
+        servercaps = wireproto.capabilities(self._repo, self._proto)
         rsp = b'capabilities: %s' % servercaps
         self._fout.write(b'%d\n' % len(rsp))
         self._fout.write(rsp)

--- a/tests/test-sshserver.py	Wed Feb 07 21:04:54 2018 -0800
+++ b/tests/test-sshserver.py	Wed Feb 07 20:17:05 2018 -0800
@@ -24,7 +24,7 @@
     def assertparse(self, cmd, input, expected):
         server = mockserver(input)
         _func, spec = wireproto.commands[cmd]
-        self.assertEqual(server.getargs(spec), expected)
+        self.assertEqual(server._proto.getargs(spec), expected)
 
 def mockserver(inbytes):
     ui = mockui(inbytes)