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POUsing Twisted AMP with Database insertion
 

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    <p>I am learning how to use Twisted AMP. I am developing a program that sends data from a client to a server and inserts the data in a SQLite3 DB. The server then sends back a result to the client which indicates success or error (try and except might not be the best way to do this but it is only a temporary solution while I work out the main problem). In order to do this I modified an example I found that originally did a sum and returned the result, so I realize that this might not be the most efficient way to do what I am trying to do. In particular I am trying to do some timings on multiple insertions (i.e. send the data to the server multiple times for multiple insertions) and I have included the code I have written. It works but clearly it is not a good way to send multiple data for insertion since I am performing multiple connections before running the reactor.</p> <p>I have tried several ways to get around this including passing the ClientCreator to reactor.callWhenRunning() but you cannot do this with a deferred.</p> <p>Any suggestions, advice or help with how to do this would be much appreciated. Here is the code.</p> <p>Server:</p> <pre><code>from twisted.protocols import amp from twisted.internet import reactor from twisted.internet.protocol import Factory import sqlite3, time class Insert(amp.Command): arguments = [('data', amp.Integer())] response = [('insert_result', amp.Integer())] class Protocol(amp.AMP): def __init__(self): self.conn = sqlite3.connect('biomed1.db') self.c =self.conn.cursor() self.res=None @Insert.responder def dbInsert(self, data): self.InsertDB(data) #call the DB inserter result=self.res # send back the result of the insertion return {'insert_result': result} def InsertDB(self,data): tm=time.time() print "insert time:",tm chx=data PID=2 device_ID=5 try: self.c.execute("INSERT INTO btdata4(co2_data, patient_Id, sensor_Id) VALUES ('%s','%s','%s')" % (chx, PID, device_ID)) except Exception, err: print err self.res=0 else: self.res=1 self.conn.commit() pf = Factory() pf.protocol = Protocol reactor.listenTCP(1234, pf) reactor.run() </code></pre> <p>Client:</p> <pre><code>from twisted.internet import reactor from twisted.internet.protocol import ClientCreator from twisted.protocols import amp import time class Insert(amp.Command): arguments = [('data', amp.Integer())] response = [('insert_result', amp.Integer())] def connected(protocol): return protocol.callRemote(Insert, data=5555).addCallback(gotResult) def gotResult(result): print 'insert_result:', result['insert_result'] tm=time.time() print "stop", tm def error(reason): print "error", reason tm=time.time() print "start",tm for i in range (10): #send data over ten times ClientCreator(reactor, amp.AMP).connectTCP( '127.0.0.1', 1234).addCallback(connected).addErrback(error) reactor.run() </code></pre> <p>End of Code.</p> <p>Thank you.</p>
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