add counter app in python

example/python/app.py

@@ -0,0 +1,83 @@
+
+import sys
+sys.path.insert(0, './tmsp')
+
+from wire import *
+from server import *
+
+
+# tmsp application interface
+
+class CounterApplication():
+    def __init__(self):
+        self.hashCount = 0
+	self.txCount = 0
+	self.commitCount = 0
+
+    def open(self):
+	    return CounterAppContext(self)
+
+class CounterAppContext():
+	def __init__(self, app):
+	    self.app = app
+	    self.hashCount = app.hashCount
+	    self.txCount = app.txCount
+	    self.commitCount = app.commitCount
+	    self.serial = False
+	    
+	def echo(self, msg):
+		return msg, 0
+
+	def info(self):
+		return ["hash, tx, commit counts:%d, %d, %d"%(self.hashCount, self.txCount, self.commitCount)], 0
+
+	def set_option(self, key, value):
+		if key == "serial" and value == "on":
+			self.serial = True
+		return 0
+
+	def append_tx(self, txBytes):
+		if self.serial:
+			txValue = decode_big_endian(BytesReader(txBytes), len(txBytes))
+			if txValue != self.txCount:
+				return [], 1
+		self.txCount += 1
+		return None, 0
+
+	def get_hash(self):
+		self.hashCount += 1
+		if self.txCount == 0:
+			return "", 0
+		return str(encode_big_endian(self.txCount, 8)), 0
+
+	def commit(self):
+		return 0 
+
+	def rollback(self):
+		return 0
+
+	def add_listener(self):
+		return 0
+
+	def rm_listener(self):
+		return 0
+
+	def event(self):
+		return 
+
+ 
+if __name__ == '__main__':
+    l = len(sys.argv)
+    if l == 1:
+       port = 46658
+    elif l == 2: 
+        port = int(sys.argv[1])
+    else:
+        print "too many arguments"
+        quit()
+
+    print 'TMSP Demo APP (Python)'
+
+    app = CounterApplication()	
+    server = TMSPServer(app, port)
+    server.main_loop()