117 lines
4.1 KiB
Python
117 lines
4.1 KiB
Python
#!/usr/bin/env python
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'''
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MySQL Tag Server
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Created on April 7, 2016
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@author: Patrick McDonagh
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@description: Continuously loops through a list of tags to store values from a PLC into a MySQL database
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'''
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from tag.tag_mysql import Tag
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import traceback
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import time
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import random
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import requests
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import json
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# DEFAULTS
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web_address = "http://localhost:3000"
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scan_rate = 30 # seconds
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save_all = "test" # use True, False, or any string
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class Sample(Tag):
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def read(self, forceSend):
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writeToDB = False
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if self.tag:
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v = 0.0
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if not (self.value is None):
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v = [self.value + (10.0 * (random.random() - 0.5))]
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else:
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v = [random.random() * 100.0]
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if v:
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val = v[0]
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if self.data_type == 'BOOL' or self.data_type == 'STRING':
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if self.mapFn:
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val = self.mapFn[val]
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if (self.last_send_time == 0) or (self.value is None) or not (self.value == val) or ((time.time() - self.last_send_time) > self.guarantee_sec) or (forceSend is True):
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self.last_value = self.value
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self.value = val
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writeToDB = True
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else:
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writeToDB = False
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else:
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if (self.last_send_time == 0) or (self.value is None) or (abs(self.value - v[0]) > self.chg_threshold) or ((time.time() - self.last_send_time) > self.guarantee_sec) or (forceSend is True):
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self.last_value = self.value
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self.value = v[0]
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writeToDB = True
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else:
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writeToDB = False
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if forceSend is False:
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writeToDB = False
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if writeToDB:
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self.sendToDB()
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return self.value
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def sendToDB(self):
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data = {}
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data['val'] = self.value
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data['tagID'] = self.db_id
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r = requests.post('{}/tag_val'.format(web_address), data=data)
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resp = json.loads(r.text)
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print("Stored {} for {} at {}".format(resp['val'], self.name, resp['createdAt']))
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tag_store = {}
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def main():
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global web_address, scan_rate, save_all
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try:
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# Get tags stored in database
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get_tag_request_data = {'where': '{"tag_class": 5}'}
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get_tag_request = requests.get('{}/tag'.format(web_address), params=get_tag_request_data)
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tags = json.loads(get_tag_request.text)
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except Exception, e:
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print("Error getting tags: {}".format(e))
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time.sleep(10)
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main()
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try:
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sr_req_data = 'where={"parameter": "scan_rate"}'
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sr_req = requests.get('{}/config?{}'.format(web_address, sr_req_data))
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sr_try = json.loads(sr_req.text)
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if len(sr_try) > 0:
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scan_rate = int(sr_try[0]['val'])
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except Exception, e:
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print("Error getting scan rage: {}".format(e))
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print("I'll just use {} seconds as the scan rate...".format(scan_rate))
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try:
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sa_req_data = {"where": {"parameter": "save_all"}}
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sa_req = requests.get('{}/config'.format(web_address), params=sa_req_data)
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sa_try = json.loads(sa_req.text)
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if len(sa_try) > 0:
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if sa_try[0]['val'].lower() == "true":
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save_all = True
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elif sa_try[0]['val'].lower() == "false":
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save_all = False
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except Exception, e:
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print("Error getting save-all: {}".format(e))
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print("I'll just use {} as the save-all parameter...".format(save_all))
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for t in tags:
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# name, tag, db_id, data_type, change_threshold, guarantee_sec, mapFn=None, device_type='CLX', ip_address='192.168.1.10'):
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tag_store[t['name']] = Sample(t['name'], t['tag'], t['id'], t['data_type'], t['change_threshold'], t['guarantee_sec'], mapFn=t['map_function'], ip_address=t['deviceID']['address'])
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while True:
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for tag in tag_store:
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try:
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tag_store[tag].read('test')
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except:
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print("ERROR EVALUATING {}".format(tag))
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traceback.print_exc()
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time.sleep(scan_rate)
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if __name__ == '__main__':
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main()
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