From 7674aac137910f3375454c2b916a12f41cb9028a Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <w.hottgenroth@krohne.com>
Date: Mon, 24 Jun 2019 16:03:57 +0200
Subject: [PATCH] cmd handler

---
 snippets/test8.py | 57 ++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 52 insertions(+), 5 deletions(-)

diff --git a/snippets/test8.py b/snippets/test8.py
index 4ee0d2a..f9f7391 100644
--- a/snippets/test8.py
+++ b/snippets/test8.py
@@ -1,6 +1,9 @@
 import queue
 import datetime
 import threading
+import socketserver
+import cmd
+import io
 
 class AbstractModbusDatapoint(object):
     def __init__(self, label, unit, address, count, scanRate):
@@ -73,6 +76,10 @@ class MqttProcessor(threading.Thread):
         self.registers = registers
         self.queue = queue
 
+    def registersChanged(self):
+        pass
+        # subscribe and/or unsubscribe according to register changes
+
     def run(self):
         pass
         # set mqtt callbacks
@@ -97,7 +104,14 @@ class ScanRateConsideringQueueFeeder(threading.Thread):
         self.queue = queue
         self.delayEvent = threading.Event()
 
+    def getMinimalScanrate(self):
+            return min([r.scanRate.total_seconds() for r in self.registers if r.scanRate])
+
+    def registersChanged(self):
+        self.delay = self.getMinimalScanrate()
+
     def run(self):
+        self.delay = self.getMinimalScanrate()
         while True:
             registersToBeHandled = [
                 r for r in self.registers if ((not r.enqueued) and
@@ -109,7 +123,7 @@ class ScanRateConsideringQueueFeeder(threading.Thread):
             for r in registersToBeHandled:
                 self.queue.put(r)
                 r.enqueued = True
-            self.delayEvent.wait(min([r.scanRate.total_seconds() for r in self.registers if r.scanRate]))
+            self.delayEvent.wait(self.delay)
 
 
 class CommunicationProcessor(threading.Thread):
@@ -127,6 +141,36 @@ class CommunicationProcessor(threading.Thread):
 
 
 
+class CmdInterpreter(cmd.Cmd):
+    def __init__(self, infile, outfile):
+        super(CmdInterpreter, self).__init__(stdin=infile, stdout=outfile)
+        self.use_rawinput = False
+
+    def do_test(self, arg):
+        self.stdout.write("This is the test response")
+
+    def do_bye(self, arg):
+        self.stdout.write("Bye!")
+        return True
+
+
+class CmdHandle(socketserver.StreamRequestHandler):
+    def handle(self):
+        print("About to handle cmd session")
+        cmd = CmdInterpreter(io.TextIOWrapper(self.rfile), io.TextIOWrapper(self.wfile))
+        cmd.cmdloop()
+
+    def finish(self):
+        super(CmdHandle, self).finish()
+        print("END")
+
+class CmdServer(object):
+    def __init__(self, address, port):
+        self.server = socketserver.ThreadingTCPServer((address, port), CmdHandle)
+        self.serverThread = threading.Thread(target=self.server.serve_forever())
+
+    def start(self):
+        self.serverThread.start()
 
 
 
@@ -161,8 +205,11 @@ queue = queue.PriorityQueue()
 
 
 if __name__ == "__main__":
-    cp = CommunicationProcessor(queue)
-    cp.start()
+    #cp = CommunicationProcessor(queue)
+    #cp.start()
 
-    qf = ScanRateConsideringQueueFeeder(datapoints, queue)
-    qf.start()
+    #qf = ScanRateConsideringQueueFeeder(datapoints, queue)
+    #qf.start()
+
+    cs = CmdServer('0.0.0.0',9999)
+    cs.start()
\ No newline at end of file