Python HTTP improvements.

1) Add @kore.prerequest python decorator.

Using this decorator on a function will cause that function
to always be executed *before* any page handler is run.

eg:

@kore.prerequest
def _check(req):
    if req.method == kore.HTTP_METHOD_POST:
        req.populate_post()

2) Allow attributes to be set on the pyhttp object.

include/kore/python_methods.h

@@ -45,6 +45,7 @@ static PyObject		*python_kore_fatalx(PyObject *, PyObject *);
 static PyObject		*python_kore_suspend(PyObject *, PyObject *);
 static PyObject		*python_kore_shutdown(PyObject *, PyObject *);
 static PyObject		*python_kore_bind_unix(PyObject *, PyObject *);
+static PyObject		*python_kore_prerequest(PyObject *, PyObject *);
 static PyObject		*python_kore_task_create(PyObject *, PyObject *);
 static PyObject		*python_kore_socket_wrap(PyObject *, PyObject *);
 static PyObject		*python_kore_gather(PyObject *, PyObject *, PyObject *);
@@ -80,6 +81,7 @@ static struct PyMethodDef pykore_methods[] = {
 	METHOD("suspend", python_kore_suspend, METH_VARARGS),
 	METHOD("shutdown", python_kore_shutdown, METH_NOARGS),
 	METHOD("bind_unix", python_kore_bind_unix, METH_VARARGS),
+	METHOD("prerequest", python_kore_prerequest, METH_VARARGS),
 	METHOD("task_create", python_kore_task_create, METH_VARARGS),
 	METHOD("socket_wrap", python_kore_socket_wrap, METH_VARARGS),
 	METHOD("websocket_broadcast", python_websocket_broadcast, METH_VARARGS),
@@ -544,6 +546,7 @@ static PyTypeObject pyconnection_type = {
 struct pyhttp_request {
 	PyObject_HEAD
 	struct http_request	*req;
+	PyObject		*dict;
 	PyObject		*data;
 };
 
@@ -621,10 +624,13 @@ static PyTypeObject pyhttp_request_type = {
 	PyVarObject_HEAD_INIT(NULL, 0)
 	.tp_name = "kore.http_request",
 	.tp_doc = "struct http_request",
+	.tp_setattro = PyObject_GenericSetAttr,
+	.tp_getattro = PyObject_GenericGetAttr,
 	.tp_getset = pyhttp_request_getset,
 	.tp_methods = pyhttp_request_methods,
 	.tp_dealloc = (destructor)pyhttp_dealloc,
 	.tp_basicsize = sizeof(struct pyhttp_request),
+	.tp_dictoffset = offsetof(struct pyhttp_request, dict),
 	.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
 };
 

src/python.c

@@ -40,6 +40,13 @@
 #include "python_api.h"
 #include "python_methods.h"
 
+struct reqcall {
+	PyObject		*f;
+	LIST_ENTRY(reqcall)	list;
+};
+
+LIST_HEAD(reqcall_list, reqcall);
+
 static PyMODINIT_FUNC	python_module_init(void);
 static PyObject		*python_import(const char *);
 static PyObject		*pyconnection_alloc(struct connection *);
@@ -177,6 +184,7 @@ static PyMemAllocatorEx allocator = {
 };
 
 static TAILQ_HEAD(, pyproc)		procs;
+static struct reqcall_list		prereq;
 
 static struct kore_pool			coro_pool;
 static struct kore_pool			iterobj_pool;
@@ -204,6 +212,8 @@ kore_python_init(void)
 	coro_id = 0;
 	coro_count = 0;
 
+	LIST_INIT(&prereq);
+
 	TAILQ_INIT(&procs);
 	TAILQ_INIT(&coro_runnable);
 	TAILQ_INIT(&coro_suspended);
@@ -620,6 +630,7 @@ pyconnection_dealloc(struct pyconnection *pyc)
 static void
 pyhttp_dealloc(struct pyhttp_request *pyreq)
 {
+	Py_XDECREF(pyreq->dict);
 	Py_XDECREF(pyreq->data);
 	PyObject_Del((PyObject *)pyreq);
 }
@@ -633,7 +644,8 @@ pyhttp_file_dealloc(struct pyhttp_file *pyfile)
 static int
 python_runtime_http_request(void *addr, struct http_request *req)
 {
-	PyObject	*pyret, *pyreq, *args, *callable;
+	struct reqcall		*rq;
+	PyObject		*pyret, *pyreq, *args, *callable;
 
 	if (req->py_coro != NULL) {
 		python_coro_wakeup(req->py_coro);
@@ -650,6 +662,26 @@ python_runtime_http_request(void *addr, struct http_request *req)
 	if ((pyreq = pyhttp_request_alloc(req)) == NULL)
 		fatal("python_runtime_http_request: pyreq alloc failed");
 
+	LIST_FOREACH(rq, &prereq, list) {
+		PyErr_Clear();
+		pyret = PyObject_CallFunctionObjArgs(rq->f, pyreq, NULL);
+
+		if (pyret == NULL) {
+			Py_DECREF(pyreq);
+			kore_python_log_error("prerequest");
+			http_response(req, HTTP_STATUS_INTERNAL_ERROR, NULL, 0);
+			return (KORE_RESULT_OK);
+		}
+
+		if (pyret == Py_False) {
+			Py_DECREF(pyreq);
+			Py_DECREF(pyret);
+			return (KORE_RESULT_OK);
+		}
+
+		Py_DECREF(pyret);
+	}
+
 	if ((args = PyTuple_New(1)) == NULL)
 		fatal("python_runtime_http_request: PyTuple_New failed");
 
@@ -1103,6 +1135,24 @@ python_kore_bind_unix(PyObject *self, PyObject *args)
 	Py_RETURN_TRUE;
 }
 
+static PyObject *
+python_kore_prerequest(PyObject *self, PyObject *args)
+{
+	PyObject		*f;
+	struct reqcall		*rq;
+
+	if (!PyArg_ParseTuple(args, "O", &f))
+		return (NULL);
+
+	rq = kore_calloc(1, sizeof(*rq));
+	rq->f = f;
+
+	Py_INCREF(f);
+	LIST_INSERT_HEAD(&prereq, rq, list);
+
+	return (f);
+}
+
 static PyObject *
 python_kore_task_create(PyObject *self, PyObject *args)
 {
@@ -3110,6 +3160,7 @@ pyhttp_request_alloc(const struct http_request *req)
 	ptr.cp = req;
 	pyreq->req = ptr.p;
 	pyreq->data = NULL;
+	pyreq->dict = NULL;
 
 	return ((PyObject *)pyreq);
 }