Merge branch 'master' into python3

[wrw.git] / wrw / dispatch.py

diff --git a/wrw/dispatch.py b/wrw/dispatch.py
index 5a7bda0..10cc2f6 100644 (file)
--- a/wrw/dispatch.py
+++ b/wrw/dispatch.py
@@ -1,3 +1,6 @@
+import sys, traceback
+from . import env, req, proto
+
 __all__ = ["restart"]
 
 class restart(Exception):
@@ -13,16 +16,66 @@ 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, i:
+            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:
         req.cleanup()
+
+def handleenv(env, startreq, handler):
+    if not "HTTP_HOST" in env:
+        return proto.simpleerror(env, startreq, 400, "Bad Request", "Request must include Host header.")
+    r = req.origrequest(env)
+    return handle(r, startreq, handler)