hgweb: move some config options to requestcontext

hgweb: move some config options to requestcontext

Various config options from the repository were stored on the
hgweb instance. While unlikely, there could be race conditions between
a new request updating these values and an in-flight request seeing both
old and new values, leading to weird results.

We move some of options/attributes from hgweb to requestcontext.

As part of this, we establish config* helpers on requestcontext. As
part of the move, we changed int() casts to configint() calls. The
int() usage likely predates the existence of configint().

We also removed config option updating from once every refresh to every
request. I don't believe obtaining config options is expensive enough to
warrant only doing when the repository has changed.

The excessive use of object.__setattr__ is unfortunate. But it will
eventually disappear once the proxy is no longer necessary.

--- a/mercurial/hgweb/hgweb_mod.py	Sat Aug 22 14:59:36 2015 -0700
+++ b/mercurial/hgweb/hgweb_mod.py	Sat Aug 22 15:02:41 2015 -0700
@@ -72,6 +72,17 @@
         object.__setattr__(self, 'app', app)
         object.__setattr__(self, 'repo', app.repo)
 
+        object.__setattr__(self, 'maxchanges',
+                           self.configint('web', 'maxchanges', 10))
+        object.__setattr__(self, 'stripecount',
+                           self.configint('web', 'stripes', 1))
+        object.__setattr__(self, 'maxshortchanges',
+                           self.configint('web', 'maxshortchanges', 60))
+        object.__setattr__(self, 'maxfiles',
+                           self.configint('web', 'maxfiles', 10))
+        object.__setattr__(self, 'allowpull',
+                           self.configbool('web', 'allowpull', True))
+
     # Proxy unknown reads and writes to the application instance
     # until everything is moved to us.
     def __getattr__(self, name):
@@ -80,6 +91,24 @@
     def __setattr__(self, name, value):
         return setattr(self.app, name, value)
 
+    # Servers are often run by a user different from the repo owner.
+    # Trust the settings from the .hg/hgrc files by default.
+    def config(self, section, name, default=None, untrusted=True):
+        return self.repo.ui.config(section, name, default,
+                                   untrusted=untrusted)
+
+    def configbool(self, section, name, default=False, untrusted=True):
+        return self.repo.ui.configbool(section, name, default,
+                                       untrusted=untrusted)
+
+    def configint(self, section, name, default=None, untrusted=True):
+        return self.repo.ui.configint(section, name, default,
+                                      untrusted=untrusted)
+
+    def configlist(self, section, name, default=None, untrusted=True):
+        return self.repo.ui.configlist(section, name, default,
+                                       untrusted=untrusted)
+
 class hgweb(object):
     """HTTP server for individual repositories.
 
@@ -117,7 +146,6 @@
         self.mtime = -1
         self.reponame = name
         self.archives = 'zip', 'gz', 'bz2'
-        self.stripecount = 1
         # a repo owner may set web.templates in .hg/hgrc to get any file
         # readable by the user running the CGI script
         self.templatepath = self.config('web', 'templates')
@@ -170,12 +198,6 @@
         if repostate != self.repostate:
             r = hg.repository(self.repo.baseui, self.repo.url())
             self.repo = self._getview(r)
-            self.maxchanges = int(self.config("web", "maxchanges", 10))
-            self.stripecount = int(self.config("web", "stripes", 1))
-            self.maxshortchanges = int(self.config("web", "maxshortchanges",
-                                                   60))
-            self.maxfiles = int(self.config("web", "maxfiles", 10))
-            self.allowpull = self.configbool("web", "allowpull", True)
             encoding.encoding = self.config("web", "encoding",
                                             encoding.encoding)
             # update these last to avoid threads seeing empty settings