Initial commit: Basic Ouroboros API0.18

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>

10 files changed, 1562 insertions, 0 deletions

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a618b2b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,344 @@
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diff --git a/README.md b/README.md
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+++ b/README.md
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+# pyOuroboros
+> a Python API for the Ouroboros recursive network prototype
+
+## Dependencies
+
+pyOuroboros requires <a href="https://ouroboros.rocks">Ouroboros</a>
+to be installed
+
+## Installation
+To build and install PyOuroboros:
+
+```shell
+./setup.py install
+```
+
+## Basic Usage
+
+```Python
+from ouroboros.dev import *
+```
+
+Server side: Accepting a flow:
+
+```Python
+f = flow_accept()
+```
+
+returns a new allocated flow object.
+
+Client side: Allocating a flow to a certain _name_:
+
+```Python
+f = flow_alloc("name")
+```
+
+returns a new allocated Flow object.
+
+Broadcast:
+
+```Python
+f = flow_join("name")
+```
+
+returns a new allocated Flow object.
+
+Deallocation:
+
+```Python
+f.dealloc()
+```
+To avoid having to call dealloc(), you can use the with statement:
+
+```Python
+with flow_alloc("dst") as f:
+    f.writeline("line")
+    print(f.readline())
+```
+
+deallocates the flow. After this call, the Flow object is not readable
+or writeable anymore.
+
+```Python
+f.alloc("name")
+```
+
+ will allocate a new flow for an existing Flow object.
+
+To read / write from a flow:
+
+```Python
+f.read(count)             # read up to _count_ bytes and return bytes
+f.readline(count)         # read up to _count_ characters as a string
+f.write(buf, count)       # write up to _count_ bytes from buffer
+f.writeline(str, count)   # write up to _count_ characters from string
+```
+
+## Quality of Service (QoS)
+
+The QoS spec details have not been finalized in Ouroboros. It is just
+here to give a general idea and to control some basics of the flow.
+You can specify a QoSSpec for flow allocation.
+
+For instance,
+
+```Python
+qos = QoSSpec(loss=0, cypher_s=256)
+f = flow_alloc("name", qos)
+```
+
+will create a new flow with FRCP retransmission enabled and encrypted
+using a 256-bit ECDHE-AES-SHA3 cypher.
+
+## Manipulating flows
+
+A number of methods are available for how to interact with Flow
+
+```Python
+f.set_snd_timeout(0.5) # set timeout for blocking write
+f.set_rcv_timeout(1.0) # set timeout for blocking read
+f.get_snd_timeout()    # get timeout for blocking write
+f.get_rcv_timeout()    # get timeout for blocking read
+f.get_qos()            # get the QoSSpec for this flow
+f.get_rx_queue_len()   # get the number of packets in the rx buffer
+f.get_tx_queue_len()   # get the number of packets in the tx buffer
+f.set_flags(flags)     # set a number of flags for this flow
+f.get_flags()          # get the flags for this flow
+```
+
+The flags are specified as an enum FlowProperties:
+
+```Python
+class FlowProperties(IntFlag):
+    ReadOnly
+    WriteOnly
+    ReadWrite
+    Down
+    NonBlockingRead
+    NonBlockingWrite
+    NonBlocking
+    NoPartialRead
+    NoPartialWrite
+```
+
+See the Ouroboros fccntl documentation for more details.
+
+```shell
+man fccntl
+```
+
+## Event API
+
+Multiple flows can be monitored for activity in parallel using a
+FlowSet and FEventQueue objects.
+
+FlowSets allow grouping a bunch of Flow objects together to listen for
+activity. It can be constructed with an optional list of Flows, or
+flows can be added or removed using the following methods:
+
+```Python
+set = FlowSet() # create a flow set,
+set.add(f)      # add a Flow 'f' to this set
+set.remove(f)   # remove a Flow 'f' from this set
+set.zero()      # remove all Flows in this set
+```
+
+An FEventQueue stores pending events on flows.
+
+The event types are defined as follows:
+```Python
+class FEventType(IntFlag):
+    FlowPkt
+    FlowDown
+    FlowUp
+    FlowAlloc
+    FlowDealloc
+```
+
+and can be obtained by calling the next method:
+
+```Python
+    f, t = fq.next() # Return active flow 'f' and type of event 't'
+```
+
+An FEventQueue is populated from a FlowSet.
+
+```Python
+fq = FEventQueue()            # Create an eventqueue
+set = FlowSet([f1, f2, f3])   # Create a new set with a couple of Flow objects
+set.wait(fq, timeo=1.0)       # Wait for 1 second or until event
+while f, t = fq.next():
+    if t == FEventType.FlowPkt:
+        msg = f.readline()
+    ...
+set.destroy()
+```
+
+A flow_set must be destroyed when it goes out of scope.
+To avoid having to call destroy, Python's with statement can be used:
+
+```Python
+fq = FEventQueue()
+with FlowSet([f]) as fs:
+    fs.wait(fq)
+f2, t = fq.next()
+if t == FEventType.FlowPkt:
+    line = f2.readline()
+```
+
+## Examples
+
+Some example code is in the examples folder.
+
+## License
+pyOuorboros is LGPLv2.1. The examples are 3-clause BSD.
diff --git a/examples/oecho.py b/examples/oecho.py
new file mode 100755
index 0000000..395930c
--- /dev/null
+++ b/examples/oecho.py
@@ -0,0 +1,62 @@
+#!/bin/python
+
+# Ouroboros - Copyright (C) 2016 - 2020
+#
+# A simple echo application
+#
+#    Dimitri Staessens <dimitri@ouroboros.rocks>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following
+# disclaimer in the documentation and/or other materials provided
+# with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+# OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from ouroboros.dev import *
+import argparse
+
+
+def client():
+    with flow_alloc("oecho") as f:
+        f.writeline("Hello, PyOuroboros!")
+        print(f.readline())
+
+
+def server():
+    print("Starting the server.")
+    while True:
+        with flow_accept() as f:
+            print("New flow.")
+            line = f.readline()
+            print("Message from client is " + line)
+            f.writeline(line)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='A simple echo client/server')
+    parser.add_argument('-l', '--listen', help='run as a server', action='store_true')
+    args = parser.parse_args()
+    server() if args.listen is True else client()
diff --git a/examples/oecho_set.py b/examples/oecho_set.py
new file mode 100755
index 0000000..4d9d1f7
--- /dev/null
+++ b/examples/oecho_set.py
@@ -0,0 +1,71 @@
+#!/bin/python
+
+# Ouroboros - Copyright (C) 2016 - 2020
+#
+# A simple echo application
+#
+#    Dimitri Staessens <dimitri@ouroboros.rocks>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following
+# disclaimer in the documentation and/or other materials provided
+# with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+# OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from ouroboros.event import *
+import argparse
+
+
+def client():
+    with flow_alloc("oecho") as f:
+        f.writeline("Hello, PyOuroboros!")
+        print(f.readline())
+
+
+def server():
+    print("Starting the server.")
+    while True:
+        with flow_accept() as f:
+            print("New flow.")
+            fq = FEventQueue()
+            with FlowSet([f]) as fs:
+                fs.wait(fq)
+            f2, t = fq.next()
+            if t != FEventType.FlowPkt:
+                continue
+            line = f2.readline()
+            print("Message from client is " + line)
+            f2.writeline(line)
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='A simple echo client/server')
+    parser.add_argument('-l', '--listen', help='run as a server', action='store_true')
+    args = parser.parse_args()
+    if args.listen is True:
+        server()
+    else:
+        client()
diff --git a/ffi/fccntl_wrap.h b/ffi/fccntl_wrap.h
new file mode 100644
index 0000000..ab227ea
--- /dev/null
+++ b/ffi/fccntl_wrap.h
@@ -0,0 +1,73 @@
+/*
+ * Ouroboros - Copyright (C) 2016 - 2020
+ *
+ * An fccntl wrapper
+ *
+ *    Dimitri Staessens <dimitri.staessens@ugent.be>
+ *    Sander Vrijders   <sander.vrijders@ugent.be>
+ *
+ * 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/.
+ */
+
+#include <ouroboros/fccntl.h>
+
+int flow_set_snd_timeout(int fd, struct timespec * ts)
+{
+        return fccntl(fd, FLOWSSNDTIMEO, ts);
+}
+
+int flow_set_rcv_timeout(int fd, struct timespec * ts)
+{
+        return fccntl(fd, FLOWSRCVTIMEO, ts);
+}
+
+int flow_get_snd_timeout(int fd, struct timespec * ts)
+{
+        return fccntl(fd, FLOWGSNDTIMEO, ts);
+}
+
+int flow_get_rcv_timeout(int fd, struct timespec * ts)
+{
+        return fccntl(fd, FLOWGRCVTIMEO, ts);
+}
+
+int flow_get_qos(int fd, qosspec_t * qs)
+{
+        return fccntl(fd, FLOWGQOSSPEC, qs);
+}
+
+int flow_get_rx_qlen(int fd, size_t * sz)
+{
+        return fccntl(fd, FLOWGRXQLEN, sz);
+}
+
+int flow_get_tx_qlen(int fd, size_t * sz)
+{
+        return fccntl(fd, FLOWGTXQLEN, sz);
+}
+
+int flow_set_flags(int fd, uint32_t flags)
+{
+        return fccntl(fd, FLOWSFLAGS, flags);
+}
+
+int flow_get_flags(int fd)
+{
+        uint32_t flags;
+
+        if (fccntl(fd, FLOWGFLAGS, &flags))
+                return -EPERM;
+
+        return (int) flags;
+}
diff --git a/ffi/pyouroboros_build.py b/ffi/pyouroboros_build.py
new file mode 100644
index 0000000..b4ace8e
--- /dev/null
+++ b/ffi/pyouroboros_build.py
@@ -0,0 +1,138 @@
+#
+# 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 cffi import FFI
+
+ffibuilder: FFI = FFI()
+
+ffibuilder.cdef("""
+/* OUROBOROS QOS.H */
+typedef struct qos_spec {
+        uint32_t delay;         /* In ms */
+        uint64_t bandwidth;     /* In bits/s */
+        uint8_t  availability;  /* Class of 9s */
+        uint32_t loss;          /* Packet loss */
+        uint32_t ber;           /* Bit error rate, errors per billion bits */
+        uint8_t  in_order;      /* In-order delivery, enables FRCT */
+        uint32_t max_gap;       /* In ms */
+        uint16_t cypher_s;      /* Cypher strength, 0 = no encryption */
+} qosspec_t;
+
+/* OUROBOROS DEV.H */
+/* Returns flow descriptor, qs updates to supplied QoS. */
+int     flow_alloc(const char *            dst_name,
+                   qosspec_t *             qs,
+                   const struct timespec * timeo);
+
+/* Returns flow descriptor, qs updates to supplied QoS. */
+int     flow_accept(qosspec_t *             qs,
+                    const struct timespec * timeo);
+
+/* Returns flow descriptor, qs updates to supplied QoS. */
+int     flow_join(const char *            bc,
+                  qosspec_t *             qs,
+                  const struct timespec * timeo);
+
+int     flow_dealloc(int fd);
+
+ssize_t flow_write(int          fd,
+                   const void * buf,
+                   size_t       count);
+
+ssize_t flow_read(int    fd,
+                  void * buf,
+                  size_t count);
+
+/*OUROBOROS FCCNTL.H, VIA WRAPPER */
+int flow_set_snd_timeout(int fd, struct timespec * ts);
+
+int flow_set_rcv_timeout(int fd, struct timespec * ts);
+
+int flow_get_snd_timeout(int fd, struct timespec * ts);
+
+int flow_get_rcv_timeout(int fd, struct timespec * ts);
+
+int flow_get_qos(int fd, qosspec_t * qs);
+
+int flow_get_rx_qlen(int fd, size_t * sz);
+
+int flow_get_tx_qlen(int fd, size_t * sz);
+
+int flow_set_flags(int fd, uint32_t flags);
+
+int flow_get_flags(int fd);
+
+/*OUROBOROS FQUEUE.H */
+enum fqtype {
+        FLOW_PKT     = (1 << 0),
+        FLOW_DOWN    = (1 << 1),
+        FLOW_UP      = (1 << 2),
+        FLOW_ALLOC   = (1 << 3),
+        FLOW_DEALLOC = (1 << 4)
+};
+
+struct flow_set;
+
+struct fqueue;
+
+typedef struct flow_set fset_t;
+typedef struct fqueue fqueue_t;
+
+fset_t *    fset_create(void);
+
+void        fset_destroy(fset_t * set);
+
+fqueue_t *  fqueue_create(void);
+
+void        fqueue_destroy(struct fqueue * fq);
+
+void        fset_zero(fset_t * set);
+
+int         fset_add(fset_t * set,
+                     int      fd);
+
+bool        fset_has(const fset_t * set,
+                     int            fd);
+
+void        fset_del(fset_t * set,
+                     int      fd);
+
+int         fqueue_next(fqueue_t * fq);
+
+int         fqueue_type(fqueue_t * fq);
+
+ssize_t     fevent(fset_t *                set,
+                   fqueue_t *              fq,
+                   const struct timespec * timeo);
+""")
+
+ffibuilder.set_source("_ouroboros_cffi",
+                      """
+#include "ouroboros/qos.h"
+#include "ouroboros/dev.h"
+#include "fccntl_wrap.h"
+#include "ouroboros/fqueue.h"
+                      """,
+                      libraries=['ouroboros-dev'],
+                      extra_compile_args=["-I./ffi/"])
+
+if __name__ == "__main__":
+    ffibuilder.compile(verbose=True)
diff --git a/ouroboros/dev.py b/ouroboros/dev.py
new file mode 100644
index 0000000..7d29624
--- /dev/null
+++ b/ouroboros/dev.py
@@ -0,0 +1,398 @@
+#
+# 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_cffi import ffi, lib
+import errno
+from enum import IntFlag
+from ouroboros.qos import *
+from ouroboros.qos import _qos_to_qosspec, _fl_to_timespec, _qosspec_to_qos, _timespec_to_fl
+
+# Some constants
+MILLION = 1000 * 1000
+BILLION = 1000 * 1000 * 1000
+
+
+# ouroboros exceptions
+class FlowAllocatedException(Exception):
+    pass
+
+
+class FlowNotAllocatedException(Exception):
+    pass
+
+
+class FlowDownException(Exception):
+    pass
+
+
+class FlowPermissionException(Exception):
+    pass
+
+
+class FlowException(Exception):
+    pass
+
+
+class FlowDeallocWarning(Warning):
+    pass
+
+
+def _raise(e: int) -> None:
+    if e >= 0:
+        return
+
+    print("error: " + str(e))
+    if e == -errno.ETIMEDOUT:
+        raise TimeoutError()
+    if e == -errno.EINVAL:
+        raise ValueError()
+    if e == -errno.ENOMEM:
+        raise MemoryError()
+    else:
+        raise FlowException()
+
+
+class FlowProperties(IntFlag):
+    ReadOnly = 0o0
+    WriteOnly = 0o1
+    ReadWrite = 0o2
+    Down = 0o4
+    NonBlockingRead = 0o1000
+    NonBlockingWrite = 0o2000
+    NonBlocking = NonBlockingRead | NonBlockingWrite
+    NoPartialRead = 0o10000
+    NoPartialWrite = 0o200000
+
+
+class Flow:
+
+    def __init__(self):
+        self.__fd: int = -1
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, tb):
+        lib.flow_dealloc(self.__fd)
+
+    def alloc(self,
+              dst: str,
+              qos: QoSSpec = None,
+              timeo: float = None) -> Optional[QoSSpec]:
+        """
+        Allocates a flow with a certain QoS to a destination
+
+        :param dst:   The destination name (string)
+        :param qos:   The QoS for the requested flow (QoSSpec)
+        :param timeo: The timeout for the flow allocation (None -> forever, 0->async)
+        :return:      The QoS for the new flow
+        """
+
+        if self.__fd >= 0:
+            raise FlowAllocatedException()
+
+        _qos = _qos_to_qosspec(qos)
+
+        _timeo = _fl_to_timespec(timeo)
+
+        self.__fd = lib.flow_alloc(dst.encode(), _qos, _timeo)
+
+        _raise(self.__fd)
+
+        return _qosspec_to_qos(_qos)
+
+    def accept(self,
+               timeo: float = None) -> QoSSpec:
+        """
+        Accepts new flows and returns the QoS
+
+        :param timeo: The timeout for the flow allocation (None -> forever, 0->async)
+        :return:      The QoS for the new flow
+        """
+
+        if self.__fd >= 0:
+            raise FlowAllocatedException()
+
+        _qos = ffi.new("qosspec_t *")
+
+        _timeo = _fl_to_timespec(timeo)
+
+        self.__fd = lib.flow_accept(_qos, _timeo)
+
+        _raise(self.__fd)
+
+        return _qosspec_to_qos(_qos)
+
+    def join(self,
+             dst: str,
+             qos: QoSSpec = None,
+             timeo: float = None) -> Optional[QoSSpec]:
+        """
+        Join a broadcast layer
+
+        :param dst:   The destination broadcast layer name (string)
+        :param qos:   The QoS for the requested flow (QoSSpec)
+        :param timeo: The timeout for the flow allocation (None -> forever, 0->async)
+        :return:      The QoS for the flow
+        """
+
+        if self.__fd >= 0:
+            raise FlowAllocatedException()
+
+        _qos = _qos_to_qosspec(qos)
+
+        _timeo = _fl_to_timespec(timeo)
+
+        self.__fd = lib.flow_join(dst.encode(), _qos, _timeo)
+
+        _raise(self.__fd)
+
+        return _qosspec_to_qos(_qos)
+
+    def dealloc(self):
+        """
+        Deallocate a flow
+
+        """
+
+        self.__fd = lib.flow_dealloc(self.__fd)
+
+        if self.__fd < 0:
+            raise FlowDeallocWarning
+
+        self.__fd = -1
+
+    def write(self,
+              buf: bytes,
+              count: int = None) -> int:
+        """
+        Attempt to write <count> bytes to a flow
+
+        :param buf:    Buffer to write from
+        :param count:  Number of bytes to write from the buffer
+        :return:       Number of bytes written
+        """
+
+        if self.__fd < 0:
+            raise FlowNotAllocatedException()
+
+        if count is None:
+            return lib.flow_write(self.__fd, ffi.from_buffer(buf), len(buf))
+        else:
+            return lib.flow_write(self.__fd, ffi.from_buffer(buf), count)
+
+    def writeline(self,
+                  ln: str) -> int:
+        """
+        Attempt to write a string to a flow
+
+        :param ln:  String to write
+        :return:    Number of bytes written
+        """
+
+        if self.__fd < 0:
+            raise FlowNotAllocatedException()
+
+        return self.write(ln.encode(), len(ln))
+
+    def read(self,
+             count: int = None) -> bytes:
+        """
+        Attempt to read bytes from a flow
+
+        :param count:   Maximum number of bytes to read
+        :return:        Bytes read
+        """
+
+        if self.__fd < 0:
+            raise FlowNotAllocatedException()
+
+        if count is None:
+            count = 2048
+
+        _buf = ffi.new("char []", count)
+
+        result = lib.flow_read(self.__fd, _buf, count)
+
+        return ffi.unpack(_buf, result)
+
+    def readline(self):
+        """
+
+        :return: A string
+        """
+        if self.__fd < 0:
+            raise FlowNotAllocatedException()
+
+        return self.read().decode()
+
+    # flow manipulation
+    def set_snd_timeout(self,
+                        timeo: float):
+        """
+        Set the timeout for blocking writes
+        """
+        _timeo = _fl_to_timespec(timeo)
+
+        if lib.flow_set_snd_timout(self.__fd, _timeo) != 0:
+            raise FlowPermissionException()
+
+    def get_snd_timeout(self) -> float:
+        """
+        Get the timeout for blocking writes
+
+        :return: timeout for blocking writes
+        """
+        _timeo = ffi.new("struct timespec *")
+
+        if lib.flow_get_snd_timeout(self.__fd, _timeo) != 0:
+            raise FlowPermissionException()
+
+        return _timespec_to_fl(_timeo)
+
+    def set_rcv_timeout(self,
+                        timeo: float):
+        """
+        Set the timeout for blocking writes
+        """
+        _timeo = _fl_to_timespec(timeo)
+
+        if lib.flow_set_rcv_timout(self.__fd, _timeo) != 0:
+            raise FlowPermissionException()
+
+    def get_rcv_timeout(self) -> float:
+        """
+        Get the timeout for blocking reads
+
+        :return: timeout for blocking writes
+        """
+        _timeo = ffi.new("struct timespec *")
+
+        if lib.flow_get_rcv_timeout(self.__fd, _timeo) != 0:
+            raise FlowPermissionException()
+
+        return _timespec_to_fl(_timeo)
+
+    def get_qos(self) -> QoSSpec:
+        """
+
+        :return: Current QoS on the flow
+        """
+        _qos = ffi.new("qosspec_t *")
+
+        if lib.flow_get_qos(self.__fd, _qos) != 0:
+            raise FlowPermissionException()
+
+        return _qosspec_to_qos(_qos)
+
+    def get_rx_queue_len(self) -> int:
+        """
+
+        :return:
+        """
+
+        size = ffi.new("size_t *")
+
+        if lib.flow_get_rx_qlen(self.__fd, size) != 0:
+            raise FlowPermissionException()
+
+        return int(size)
+
+    def get_tx_queue_len(self) -> int:
+        """
+
+        :return:
+        """
+
+        size = ffi.new("size_t *")
+
+        if lib.flow_get_tx_qlen(self.__fd, size) != 0:
+            raise FlowPermissionException()
+
+        return int(size)
+
+    def set_flags(self, flags: FlowProperties):
+        """
+        Set flags for this flow.
+        :param flags:
+        """
+
+        _flags = ffi.new("uint32_t *", int(flags))
+
+        if lib.flow_set_flag(self.__fd, _flags):
+            raise FlowPermissionException()
+
+    def get_flags(self) -> FlowProperties:
+        """
+        Get the flags for this flow
+        """
+
+        flags = lib.flow_get_flag(self.__fd)
+        if flags < 0:
+            raise FlowPermissionException()
+
+        return FlowProperties(int(flags))
+
+
+def flow_alloc(dst: str,
+               qos: QoSSpec = None,
+               timeo: float = None) -> Flow:
+    """
+
+    :param dst:    Destination name
+    :param qos:    Requested QoS
+    :param timeo:  Timeout to wait for the allocation
+    :return:       A new Flow()
+    """
+
+    f = Flow()
+    f.alloc(dst, qos, timeo)
+    return f
+
+
+def flow_accept(timeo: float = None) -> Flow:
+    """
+
+    :param timeo:  Timeout to wait for the allocation
+    :return:       A new Flow()
+    """
+
+    f = Flow()
+    f.accept(timeo)
+    return f
+
+
+def flow_join(dst: str,
+              qos: QoSSpec = None,
+              timeo: float = None) -> Flow:
+    """
+
+    :param dst:    Broadcast layer name
+    :param qos:    Requested QoS
+    :param timeo:  Timeout to wait for the allocation
+    :return:       A new Flow()
+    """
+
+    f = Flow()
+    f.join(dst, qos, timeo)
+    return f
+
+
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)
diff --git a/ouroboros/qos.py b/ouroboros/qos.py
new file mode 100644
index 0000000..f437ee2
--- /dev/null
+++ b/ouroboros/qos.py
@@ -0,0 +1,110 @@
+#
+# Ouroboros - Copyright (C) 2016 - 2020
+#
+# Python API for applications - QoS
+#
+#    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_cffi import ffi
+from math import modf
+from typing import Optional
+
+# Some constants
+MILLION = 1000 * 1000
+BILLION = 1000 * 1000 * 1000
+
+
+class QoSSpec:
+    """
+    delay:        In ms, default 1000s
+    bandwidth:    In bits / s, default 0
+    availability: Class of 9s, default 0
+    loss:         Packet loss in ppm, default MILLION
+    ber:          Bit error rate, errors per billion bits. default BILLION
+    in_order:     In-order delivery, enables FRCT, default 0
+    max_gap:      Maximum interruption in ms, default MILLION
+    cypher_s:     Requested encryption strength in bits
+    """
+
+    def __init__(self,
+                 delay: int = MILLION,
+                 bandwidth: int = 0,
+                 availability: int = 0,
+                 loss: int = 1,
+                 ber: int = MILLION,
+                 in_order: int = 0,
+                 max_gap: int = MILLION,
+                 cypher_s: int = 0):
+        self.delay = delay
+        self.bandwidth = bandwidth
+        self.availability = availability
+        self.loss = loss
+        self.ber = ber
+        self.in_order = in_order
+        self.max_gap = max_gap
+        self.cypher_s = cypher_s
+
+
+def _fl_to_timespec(timeo: float):
+    if timeo is None:
+        return ffi.NULL
+    elif timeo <= 0:
+        return ffi.new("struct timespec *", [0, 0])
+    else:
+        frac, whole = modf(timeo)
+        _timeo = ffi.new("struct timespec *")
+        _timeo.tv_sec = whole
+        _timeo.tv_nsec = frac * BILLION
+        return _timeo
+
+
+def _timespec_to_fl(_timeo) -> Optional[float]:
+    if _timeo is ffi.NULL:
+        return None
+    elif _timeo.tv_sec <= 0 and _timeo.tv_nsec == 0:
+        return 0
+    else:
+        return _timeo.tv_sec + _timeo.tv_nsec / BILLION
+
+
+def _qos_to_qosspec(qos: QoSSpec):
+    if qos is None:
+        return ffi.NULL
+    else:
+        return ffi.new("qosspec_t *",
+                       [qos.delay,
+                        qos.bandwidth,
+                        qos.availability,
+                        qos.loss,
+                        qos.ber,
+                        qos.in_order,
+                        qos.max_gap,
+                        qos.cypher_s])
+
+
+def _qosspec_to_qos(_qos) -> Optional[QoSSpec]:
+    if _qos is ffi.NULL:
+        return None
+    else:
+        return QoSSpec(delay=_qos.delay,
+                       bandwidth=_qos.bandwidth,
+                       availability=_qos.availability,
+                       loss=_qos.loss,
+                       ber=_qos.ber,
+                       in_order=_qos.in_order,
+                       max_gap=_qos.max_gap,
+                       cypher_s=_qos.cypher_s)
diff --git a/setup.py b/setup.py
new file mode 100755
index 0000000..023f3b4
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+
+import setuptools
+
+setuptools.setup(
+    name='PyOuroboros',
+    version=0.17,
+    url='https://ouroboros.rocks',
+    keywords='ouroboros IPC subsystem',
+    author='Dimitri Staessens',
+    author_email='dimitri@ouroboros.rocks',
+    license='LGPLv2.1',
+    description='Python API for Ouroboros',
+    packages=[
+        'ouroboros'
+    ],
+    setup_requires=[
+        "cffi>=1.0.0"
+    ],
+    cffi_modules=[
+        "ffi/pyouroboros_build.py:ffibuilder"
+    ],
+    install_requires=[
+        "cffi>=1.0.0"
+    ])