add wrappers for evbuffer, evhttp, evhttp_request and evhttp_connection

gevent/evbuffer.pxi

+cdef extern from "libevent.h":
+    struct evbuffer:
+        char *buf "buffer"
+        int off
+
+    evbuffer *evbuffer_new()
+    int       evbuffer_add(evbuffer *buf, char *p, int len)
+    char     *evbuffer_readline(evbuffer *buf)
+    void      evbuffer_free(evbuffer *buf)
+    size_t    evbuffer_get_length(evbuffer *buffer)
+    unsigned char *evbuffer_pullup(evbuffer *buf, size_t size)
+    int       EVBUFFER_DRAIN(evbuffer *buf, size_t len)
+
+
+cdef class buffer:
+    cdef evbuffer* __obj
+
+    def __init__(self, size_t _obj):
+        self.__obj = <evbuffer*>_obj
+
+    property _obj:
+
+        def __get__(self):
+            return <size_t>(self.__obj)
+
+    def __len__(self):
+        return evbuffer_get_length(self.__obj)
+
+    def __nonzero__(self):
+        return self.__obj and evbuffer_get_length(self.__obj)
+
+    # cython does not implement generators
+    #def __iter__(self):
+    #    while len(self):
+    #        yield self.readline()
+
+    def read(self, long size=-1):
+        cdef long length = evbuffer_get_length(self.__obj)
+        if size < 0:
+            size = length
+        else:
+            size = min(size, length)
+        if size <= 0:
+            return ''
+        cdef char* data = <char*>evbuffer_pullup(self.__obj, size)
+        if not data:
+            raise RuntimeError('evbuffer_pullup(%x, %s) returned NULL' % (self._obj, size))
+        cdef object result = PyString_FromStringAndSize(data, size)
+        cdef res = EVBUFFER_DRAIN(self.__obj, size)
+        if res:
+            raise RuntimeError('evbuffer_drain(%x, %s) returned %s' % (self._obj, size, res))
+        return result
+
+    def readline(self):
+        return evbuffer_readline(self.__obj) or ''
+
+    def readlines(self, hint=-1):
+        return list(self.__iter__())
+
+ 

gevent/libevent.h

+#include "sys/queue.h"
+
+#ifdef USE_LIBEVENT_2
+
+#warning "Using libevent2"
+
+#include "event2/event.h"
+#include "event2/event_struct.h"
+#include "event2/event_compat.h"
+#include "event2/http.h"
+#include "event2/http_compat.h"
+#include "event2/http_struct.h"
+#include "event2/buffer.h"
+#include "event2/buffer_compat.h"
+
+#define EVBUFFER_DRAIN evbuffer_drain
+#define EVHTTP_SET_CB  evhttp_set_cb
+
+#elif USE_LIBEVENT_1
+
+#warning "Using libevent1"
+
+#include "event.h"
+#include "evhttp.h"
+
+/* compatibility */
+
+#define evbuffer_get_length EVBUFFER_LENGTH
+#define evbuffer_pullup(BUF, SIZE) EVBUFFER_DATA(BUF)
+
+#define TAILQ_FIRST(head) ((head)->tqh_first)
+#define	TAILQ_NEXT(elm, field) ((elm)->field.tqe_next)
+
+/* functions that return int in libeven2 but void in libevent1 */
+#define EVBUFFER_DRAIN(A, B) (evbuffer_drain((A), (B)), 0)
+#define EVHTTP_SET_CB(A, B, C, D) (evhttp_set_cb((A), (B), (C), (D)), 0)
+
+#else
+
+#error "Please define either USE_LIBEVENT_1 or USE_LIBEVENT_2"
+
+#endif
+
+#define TAILQ_GET_NEXT(X) TAILQ_NEXT((X), next)
+
 extern void *current_base;
+