X-Git-Url: http://dolda2000.com/gitweb/?a=blobdiff_plain;f=wrw%2Fdispatch.py;h=e51559e1fbe4b477a847af6bc1ea985a588393f2;hb=a02127330452ddc72406bb1e2e3eeadefe773ebb;hp=b6009af680a3ed302c5a5b201ec7882ca35ac7fb;hpb=c33f2d6c068bf96c56e8e6966340f5f6e448df96;p=wrw.git

diff --git a/wrw/dispatch.py b/wrw/dispatch.py
index b6009af..e51559e 100644
--- a/wrw/dispatch.py
+++ b/wrw/dispatch.py
@@ -1,3 +1,6 @@
+import sys, traceback
+from . import env
+
 __all__ = ["restart"]
 
 class restart(Exception):
@@ -13,15 +16,59 @@ def mangle(result):
         return result
     return [str(result)]
 
+class iterproxy(object):
+    # Makes sure iter(real).next() is called immediately, in order to
+    # let generator code run.
+    def __init__(self, real):
+        self.bk = real
+        self.bki = iter(real)
+        self._next = [None]
+        self.__next__()
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        if self._next is None:
+            raise StopIteration()
+        ret = self._next[0]
+        try:
+            self._next[:] = [self.bki.__next__()]
+        except StopIteration:
+            self._next = None
+        return ret
+
+    def close(self):
+        if hasattr(self.bk, "close"):
+            self.bk.close()
+
+def defaulterror(req, excinfo):
+    from . import resp
+    traceback.print_exception(*excinfo)
+    raise resp.httperror(500)
+
+def wraphandler(handler, excinfo):
+    def wrapped(req):
+        return handler(req, excinfo)
+    return wrapped
+
+errorhandler = env.var(defaulterror)
+
 def handle(req, startreq, handler):
+    eh = errorhandler.val
     try:
         resp = [""]
         while True:
             try:
-                resp = handler(req)
+                resp = iterproxy(handler(req))
                 break
             except restart as i:
                 handler = i.handle
+            except Exception as i:
+                if eh is None:
+                    raise
+                handler = wraphandler(eh, sys.exc_info())
+                eh = None
         req.commit(startreq)
         return resp
     finally: