From 5974215c9864ca72945b553f5374dbc8ba9a191d Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sat, 16 May 2020 17:22:09 +0200
Subject: Initial commit: Basic Ouroboros API

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
---
 ouroboros/event.py | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 ouroboros/event.py

(limited to 'ouroboros/event.py')

diff --git a/ouroboros/event.py b/ouroboros/event.py
new file mode 100644
index 0000000..b707c1b
--- /dev/null
+++ b/ouroboros/event.py
@@ -0,0 +1,147 @@
+#
+# Ouroboros - Copyright (C) 2016 - 2020
+#
+# Python API for applications
+#
+#    Dimitri Staessens <dimitri@ouroboros.rocks>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public License
+# version 2.1 as published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., http://www.fsf.org/about/contact/.
+#
+
+from ouroboros.dev import *
+from ouroboros.qos import _fl_to_timespec
+
+
+# async API
+class FlowEventError(Exception):
+    pass
+
+
+class FEventType(IntFlag):
+    FlowPkt = lib.FLOW_PKT
+    FlowDown = lib.FLOW_DOWN
+    FlowUp = lib.FLOW_UP
+    FlowAlloc = lib.FLOW_ALLOC
+    FlowDealloc = lib.FLOW_DEALLOC
+
+
+class FEventQueue:
+    """
+    A queue of events waiting to be handled
+    """
+
+    def __init__(self):
+        self.__fq = lib.fqueue_create()
+        if self.__fq is ffi.NULL:
+            raise MemoryError("Failed to create FEventQueue")
+
+    def __del__(self):
+        lib.fqueue_destroy(self.__fq)
+
+    def next(self):
+        """
+        Get the next event
+        :return: Flow and eventtype on that flow
+        """
+        f = Flow()
+        f._Flow__fd = lib.fqueue_next(self.__fq)
+        if f._Flow__fd < 0:
+            raise FlowEventError
+
+        _type = lib.fqueue_type(self.__fq)
+        if _type < 0:
+            raise FlowEventError
+
+        return f, _type
+
+
+class FlowSet:
+    """
+    A set of flows that can be monitored for events
+    """
+    def __init__(self,
+                 flows: [Flow] = None):
+
+        self.__set = lib.fset_create()
+        if self.__set is ffi.NULL:
+            raise MemoryError("Failed to create FlowSet")
+
+        if flows is not None:
+            for flow in flows:
+                if lib.fset_add(self.__set, flow._Flow__fd) != 0:
+                    lib.fset_destroy(self.__set)
+                    self.__set = ffi.NULL
+                    raise MemoryError("Failed to add flow " + str(flow._Flow__fd) + ".")
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, tb):
+        lib.fset_destroy(self.__set)
+
+    def add(self,
+            flow: Flow):
+        """
+        Add a Flow
+
+        :param flow: The flow object to add
+        """
+
+        if self.__set is ffi.NULL:
+            raise ValueError
+
+        if lib.fset_add(self.__set, flow._Flow___fd) != 0:
+            raise MemoryError("Failed to add flow")
+
+    def zero(self):
+        """
+        Remove all Flows from this set
+        """
+
+        if self.__set is ffi.NULL:
+            raise ValueError
+
+        lib.fset_zero(self.__set)
+
+    def remove(self,
+               flow: Flow):
+        """
+        Remove a flow from a set
+
+        :param flow:
+        """
+
+        if self.__set is ffi.NULL:
+            raise ValueError
+
+        lib.fset_del(self.__set, flow._Flow__fd)
+
+    def wait(self,
+             fq: FEventType,
+             timeo: float = None):
+        """
+        Wait for at least one event on one of the monitored flows
+        """
+
+        if self.__set is ffi.NULL:
+            raise ValueError
+
+        _timeo = _fl_to_timespec(timeo)
+
+        ret = lib.fevent(self.__set, fq._FEventQueue__fq, _timeo)
+        if ret < 0:
+            raise FlowEventError
+
+    def destroy(self):
+        lib.fset_destroy(self.__set)
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