changeset 38997:812eec3f89cb

changegroup: remove _clnodetorev

cgpacker._clnodetorev is a glorified cache/index of changelog
nodes to revision numbers.

I'm not sure why it exists. Maybe performance? But its presence
is making refactoring of this code more complicated than it needs
to be.

This commit removes the cache and replaces it with direct lookups
against the changelog.

If this cache was for performance reasons, we should be able to
restore it easily enough... after the changegroup refactor is
complete.

Differential Revision: https://phab.mercurial-scm.org/D4189

--- a/mercurial/changegroup.py	Mon Aug 06 15:44:33 2018 -0700
+++ b/mercurial/changegroup.py	Tue Aug 07 10:49:41 2018 -0700
@@ -533,7 +533,7 @@
     else:
         return sorted([store.rev(n) for n in nodes])
 
-def _sortnodesellipsis(store, nodes, clnodetorev, lookup):
+def _sortnodesellipsis(store, nodes, cl, lookup):
     """Sort nodes for changegroup generation and turn into revnums."""
     # Ellipses serving mode.
     #
@@ -551,7 +551,7 @@
     # order that they're introduced in dramatis personae by the
     # changelog, so what we do is we sort the non-changelog histories
     # by the order in which they are used by the changelog.
-    key = lambda n: clnodetorev[lookup(n)]
+    key = lambda n: cl.rev(lookup(n))
     return [store.rev(n) for n in sorted(nodes, key=key)]
 
 def _revisiondeltanormal(store, rev, prev, linknode, deltaparentfn):
@@ -663,10 +663,6 @@
         self._clrevtolocalrev = {}
         self._nextclrevtolocalrev = {}
 
-        # Maps changelog nodes to changelog revs. Filled in once
-        # during changelog stage and then left unmodified.
-        self._clnodetorev = {}
-
     def _close(self):
         # Ellipses serving mode.
         self._clrevtolocalrev.clear()
@@ -695,6 +691,8 @@
             yield self._close()
             return
 
+        cl = self._repo.changelog
+
         # add the parent of the first rev
         p = store.parentrevs(revs[0])[0]
         revs.insert(0, p)
@@ -711,7 +709,7 @@
             linknode = lookup(store.node(curr))
 
             if self._ellipses:
-                linkrev = self._clnodetorev[linknode]
+                linkrev = cl.rev(linknode)
                 self._clrevtolocalrev[linkrev] = curr
 
                 # This is a node to send in full, because the changeset it
@@ -864,8 +862,6 @@
             clrevorder[x] = len(clrevorder)
 
             if self._ellipses:
-                self._clnodetorev[x] = cl.rev(x)
-
                 # Only update mfs if x is going to be sent. Otherwise we
                 # end up with bogus linkrevs specified for manifests and
                 # we skip some manifest nodes that we should otherwise
@@ -921,6 +917,7 @@
         change what is sent based in pulls vs pushes, etc.
         """
         repo = self._repo
+        cl = repo.changelog
         mfl = repo.manifestlog
         dirlog = mfl._revlog.dirlog
         tmfnodes = {'': mfs}
@@ -976,8 +973,8 @@
                 lookupfn = makelookupmflinknode(dir, nodes)
 
                 if self._ellipses:
-                    revs = _sortnodesellipsis(store, prunednodes,
-                                              self._clnodetorev, lookupfn)
+                    revs = _sortnodesellipsis(store, prunednodes, cl,
+                                              lookupfn)
                 else:
                     revs = _sortnodesnormal(store, prunednodes,
                                             self._reorder)
@@ -1025,6 +1022,7 @@
 
     def _generatefiles(self, changedfiles, linknodes, commonrevs, source):
         repo = self._repo
+        cl = repo.changelog
         progress = repo.ui.makeprogress(_('bundling'), unit=_('files'),
                                         total=len(changedfiles))
         for i, fname in enumerate(sorted(changedfiles)):
@@ -1043,7 +1041,7 @@
             if filenodes:
                 if self._ellipses:
                     revs = _sortnodesellipsis(filerevlog, filenodes,
-                                              self._clnodetorev, lookupfilelog)
+                                              cl, lookupfilelog)
                 else:
                     revs = _sortnodesnormal(filerevlog, filenodes,
                                             self._reorder)
@@ -1074,14 +1072,6 @@
                 return nullrev
 
             if ischangelog:
-                # If we're doing the changelog, it's possible that we
-                # have a parent that is already on the client, and we
-                # need to store some extra mapping information so that
-                # our contained ellipsis nodes will be able to resolve
-                # their parents.
-                if clrev not in self._clrevtolocalrev:
-                    clnode = store.node(clrev)
-                    self._clnodetorev[clnode] = clrev
                 return clrev
 
             # Walk the ellipsis-ized changelog breadth-first looking for a