From d12c9807f53d2b6948b7d7ec061c0aa8268a31b9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Krist=C3=B3f=20T=C3=B3th?= <kristof.toth@avatao.com>
Date: Fri, 12 Apr 2019 15:42:00 +0200
Subject: [PATCH] Implement Python bindings for pipe io client

---
 clients/python/example.py |  7 ++++
 clients/python/pipe_io.py | 69 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 clients/python/example.py
 create mode 100644 clients/python/pipe_io.py

diff --git a/clients/python/example.py b/clients/python/example.py
new file mode 100644
index 0000000..fff7cc8
--- /dev/null
+++ b/clients/python/example.py
@@ -0,0 +1,7 @@
+from pipe_io import PipeIO
+
+
+if __name__ == '__main__':
+    with PipeIO('in', 'out') as pipeio:
+        pipeio.reader.message_handler = pipeio.writer.send_message
+        pipeio.reader.run()
diff --git a/clients/python/pipe_io.py b/clients/python/pipe_io.py
new file mode 100644
index 0000000..cac23b4
--- /dev/null
+++ b/clients/python/pipe_io.py
@@ -0,0 +1,69 @@
+from typing import Callable
+
+
+class PipeReader:
+    def __init__(self, pipe_path):
+        self._pipe = open(pipe_path, 'rb')
+        self._message_handler = lambda msg: None
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type_, value, traceback):
+        self.close()
+
+    def close(self):
+        self._pipe.close()
+
+    @property
+    def message_handler(self):
+        return self._message_handler
+
+    @message_handler.setter
+    def message_handler(self, value):
+        if not isinstance(value, Callable):
+            raise ValueError("message_handler must be callable!")
+        self._message_handler = value
+
+    def run(self):
+        msg = self.recv_message()
+        while msg:
+            self._message_handler(msg)
+            msg = self.recv_message()
+
+    def recv_message(self):
+        return self._pipe.readline()[:-1]
+
+
+class PipeWriter:
+    def __init__(self, pipe_path):
+        self._pipe = open(pipe_path, 'wb')
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type_, value, traceback):
+        self.close()
+
+    def close(self):
+        self._pipe.close()
+
+    def send_message(self, message):
+        self._pipe.write(message + b'\n')
+        self._pipe.flush()
+
+
+class PipeIO:
+    def __init__(self, in_pipe_path, out_pipe_path):
+        self.reader = PipeReader(in_pipe_path)
+        self.writer = PipeWriter(out_pipe_path)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type_, value, traceback):
+        self.close()
+
+    def close(self):
+        self.reader.close()
+        self.writer.close()