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ca_mqtt_gw.py
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ca_mqtt_gw.py
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#!/usr/bin/env python
import cothread.catools as catools
import cothread
from cothread.catools import *
import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)
from PyQt4 import QtCore
import json
import time
import sys
import os
import array
import struct
import paho.mqtt.client as mqtt
import paho.mqtt.publish as publish
import traceback
import logging
chans = []
id = 0
waveforms = {}
class PvMqttChan:
def __init__(self,connection,servers,client):
self.chan = unicodeToStr(connection["mqtt"])
self.pv = unicodeToStr(connection["pv"])
if "datatype" in connection:
self.datatype = unicodeToStr(connection["datatype"])
else:
self.datatype = None
self.direction = unicodeToStr(connection["direction"])
if "qos" in connection:
self.qos = connection["qos"]
else:
self.qos = 0
self.retain = False;
if ("retain" in connection) and connection["retain"] == "true":
self.retain = True;
self.servers = servers
self.client = client
def setConnection(self):
try:
catools.connect(self.pv)
if self.direction=="mp":
if self.datatype == "wfint":
self.client.subscribe(self.chan+"#")
else:
self.client.subscribe(self.chan)
elif self.direction=="pm":
camonitor(self.pv,self.updateChan)
print(self.chan+" connection set")
except Exception as e:
print("Trouble with connection:\n" + traceback.format_exc())
#cothread.Quit()
def updateChan(self,value):
try:
if self.datatype=="wfint":
self.sendWf(value)
else:
self.client.publish(self.chan,value,self.qos, self.retain)
except Exception as e:
print("Trouble when Publishing to Mqtt with " + self.chan + ":\n" + traceback.format_exc())
logging.info("Trouble when Publishing to Mqtt with "+self.chan+": "+ str(e))
#cothread.Quit()
def updatePv(self,value):
try:
pv_val = value
if self.datatype == "wfint":
self.wfToWf(value)
else:
if self.datatype == "wfint1":
pv_val = self.wfToScalar(value)
elif self.datatype == "int":
pv_val = self.intToScalar(value)
cothread.Callback(caput,self.pv,pv_val)
except Exception as e:
print("Trouble in updatePv with " + self.pv + ":\n" + traceback.format_exc())
logging.info("Trouble when Publishing to PV with "+self.pv+": "+ str(e))
#cothread.Quit()
def findServer(self,type,name):
result = [x for x in self.servers if x.type == type and x.name == name]
if len(result) != 0:
return result[0]
def isChannelWorkDelayed(self):
server = self.findServer("ioc",self.pv.split("_",1)[0])
if not server.checkServer():
return True
server = self.findServer("mqtt",self.chan.split("/",1)[0])
if not server.checkServer():
return True
return False
def setServerDelay(self,error):
channelname = error.split(' ',1)[0]
servername = channelname.split("_",1)[0]
server = self.findServer("ioc",servername)
if not server:
servername = channelname.split("/",1)[0]
server = self.findServer("mqtt",servername)
if server:
server.delayServer()
return
def sendWf(self,wf):
global id
waveform = WaveForm(id,wf)
waveform.sendWfToMqtt(self.client,self.chan,self.qos,0.07)
id+=1
def wfToScalar(self,wf):
return float(struct.unpack(">iii",wf)[2])
def intToScalar(self,wf):
return float(struct.unpack(">i",wf)[0])
def wfToWf(self,wf):
global waveforms
wflen = len(wf)//4
message = struct.unpack(">%ui"%wflen,wf)
wfid = int(message[0])
msgsize = int(message[1])
if wfid in waveforms:
#print(wfid)
waveforms[wfid].appendMessage(message)
else:
waveforms[wfid] = WaveForm(id=wfid,msgsize=msgsize,first_msg=message)
if waveforms[wfid].sendWfToPv(self.pv):
del waveforms[wfid]
class WaveForm:
def __init__(self,id,msg=None,msgsize=None,maxsize=300,first_msg=None):
self.maxsize = maxsize
self.id = id
if first_msg:
self.msgsize = msgsize
self.messages = [first_msg]
self.msg = self.unpackWf()
else:
self.msg = msg
self.msgsize = len(msg)
self.messages = self.packWf()
def appendMessage(self,message):
self.messages.append(message)
self.msg = self.unpackWf()
def unpackWf(self):
wf = []
n_segments = (self.msgsize - 1)//self.maxsize + 1
#print(n_segments)
if n_segments > len(self.messages):
return wf
last_segment_size = self.msgsize%self.maxsize
segment_size = self.maxsize
for i in range(n_segments):
if(i==n_segments-1):
segment_size = last_segment_size
segment = self.messages[i]
wf = wf + list(segment[2:])#struct.unpack(">%ui"%(segment_size+2),segment)[2:]
return wf
def packWf(self):
pack = []
if self.msgsize==0:
return pack
n_segments = (self.msgsize - 1)//self.maxsize + 1
last_segment_size = self.msgsize%self.maxsize
segment_size = self.maxsize
for i in range(n_segments):
if(i==n_segments-1):
segment_size = last_segment_size
segment = []
for j in range(i*self.maxsize,i*self.maxsize+segment_size):
segment.append(self.msg[j])
sendline = [id,self.msgsize]+segment
pack.append(struct.pack(">%ui"%(segment_size+2),*sendline))
return pack
def sendWfToMqtt(self,client,address,qos,sleeptime):
for i in range(len(self.messages)):
msgaddress = address+"/"+str(i).zfill(3)
client.publish(msgaddress,self.messages[i],qos)
time.sleep(sleeptime)
def sendWfToPv(self,pv_name):
try:
#print("[debug] self.msg: %s" % self.msg);
#print("[debug] len(self.msg): %s" % len(self.msg));
if len(self.msg)!=0:
cothread.Callback(caput,pv_name,self.msg)
return True
return False
except Exception as e:
print("Trouble when Publishing to PV with "+pv_name+": "+ str(e))
logging.info("Trouble when Publishing to PV with "+pv_name+": "+ str(e))
class Server:
def __init__(self,type,name,timestamp=None):
self.type = type
self.name = name
self.timestamp = timestamp
def delayServer(self):
self.timestamp = time.time()
def checkServer(self):
if not self.timestamp:
return True
if time.time()-self.timestamp>10:
return True
return False
def openConfigFile(filename):
with open(filename) as data_file:
data = json.load(data_file)
return data
def unicodeToStr(name):
string = name.encode('ascii', 'ignore')
return string
def getChannel(channame):
global chans
for chan in chans:
if channame.startswith(chan.chan):
return chan
def on_connect(client, userdata, flags, rc):
global chans
print("Connected with result code "+str(rc))
#for channel in chans:
# channel.setConnection()
def on_message(client, userdata, msg):
print(msg.topic)
getChannel(msg.topic).updatePv(msg.payload)
script_dir = os.path.dirname(__file__)
config_info = openConfigFile(os.path.join(script_dir,"gateway_config.json"))
qapp = QtCore.QCoreApplication(sys.argv)
#app = cothread.iqt()#run_exec=False)
logging.basicConfig(filename=os.path.join(script_dir,'info.log'), level=logging.INFO)
logging.info("Start")
servers = []
servers.extend((Server("ioc","VEPP3"),Server("mqtt","VEPP3")))
client = mqtt.Client()
client.on_connect = on_connect
client.on_message = on_message
client.connect("192.168.176.128")
for connection in config_info:
channel = PvMqttChan(connection,servers,client)
channel.setConnection()
chans.append(channel)
client.loop_start()
try:
cothread.WaitForQuit()
finally:
client.loop_stop()