From 7d5c3dcd969161322deed6c43f8a6a3cb92c3369 Mon Sep 17 00:00:00 2001
From: Micah Anderson <micah@riseup.net>
Date: Tue, 11 Nov 2014 11:53:55 -0500
Subject: upgrade to 14.4.1

---
 examples/serialization/serialsocket.py | 74 ++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 examples/serialization/serialsocket.py

(limited to 'examples/serialization')

diff --git a/examples/serialization/serialsocket.py b/examples/serialization/serialsocket.py
new file mode 100644
index 0000000..7329bb9
--- /dev/null
+++ b/examples/serialization/serialsocket.py
@@ -0,0 +1,74 @@
+"""A Socket subclass that adds some serialization methods."""
+
+import zlib
+import pickle
+
+import numpy
+
+import zmq
+
+class SerializingSocket(zmq.Socket):
+    """A class with some extra serialization methods
+    
+    send_zipped_pickle is just like send_pyobj, but uses
+    zlib to compress the stream before sending.
+    
+    send_array sends numpy arrays with metadata necessary
+    for reconstructing the array on the other side (dtype,shape).
+    """
+    
+    def send_zipped_pickle(self, obj, flags=0, protocol=-1):
+        """pack and compress an object with pickle and zlib."""
+        pobj = pickle.dumps(obj, protocol)
+        zobj = zlib.compress(pobj)
+        print('zipped pickle is %i bytes' % len(zobj))
+        return self.send(zobj, flags=flags)
+    
+    def recv_zipped_pickle(self, flags=0):
+        """reconstruct a Python object sent with zipped_pickle"""
+        zobj = self.recv(flags)
+        pobj = zlib.decompress(zobj)
+        return pickle.loads(pobj)
+
+    def send_array(self, A, flags=0, copy=True, track=False):
+        """send a numpy array with metadata"""
+        md = dict(
+            dtype = str(A.dtype),
+            shape = A.shape,
+        )
+        self.send_json(md, flags|zmq.SNDMORE)
+        return self.send(A, flags, copy=copy, track=track)
+
+    def recv_array(self, flags=0, copy=True, track=False):
+        """recv a numpy array"""
+        md = self.recv_json(flags=flags)
+        msg = self.recv(flags=flags, copy=copy, track=track)
+        A = numpy.frombuffer(msg, dtype=md['dtype'])
+        return A.reshape(md['shape'])
+
+class SerializingContext(zmq.Context):
+    _socket_class = SerializingSocket
+
+def main():
+    ctx = SerializingContext()
+    req = ctx.socket(zmq.REQ)
+    rep = ctx.socket(zmq.REP)
+    
+    rep.bind('inproc://a')
+    req.connect('inproc://a')
+    A = numpy.ones((1024,1024))
+    print ("Array is %i bytes" % (len(A) * 8))
+    
+    # send/recv with pickle+zip
+    req.send_zipped_pickle(A)
+    B = rep.recv_zipped_pickle()
+    # now try non-copying version
+    rep.send_array(A, copy=False)
+    C = req.recv_array(copy=False)
+    print ("Checking zipped pickle...")
+    print ("Okay" if (A==B).all() else "Failed")
+    print ("Checking send_array...")
+    print ("Okay" if (C==B).all() else "Failed")
+
+if __name__ == '__main__':
+    main()
\ No newline at end of file
-- 
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