added Tag classes for MySQL and SQLite

python/tag_sqlite.py

@@ -0,0 +1,79 @@
+#! /usr/bin/python
+from datetime import datetime
+import time
+import sqlite3 as lite
+from pycomm.ab_comm.clx import Driver as ClxDriver
+import micro800 as u800
+import traceback
+import pickle
+
+con = lite.connect("/mnt/usb/data.db")
+# con = lite.connect("/Users/patrickjmcd/Desktop/data.db")
+
+
+def readTag(addr, tag):
+    time.sleep(0.01)
+    c = ClxDriver()
+    if c.open(addr):
+        try:
+            v = c.read_tag(tag)
+            return v
+        except Exception:
+            print("ERROR RETRIEVING TAG: {}".format(tag))
+            err = c.get_status()
+            c.close()
+            print err
+            pass
+        c.close()
+
+class Tag():
+    global readTag, con
+
+    def __init__(self, name, tag, data_type, change_threshold, guarantee_sec, mapFn=None, plc_type='CLK'):
+        self.name = name
+        self.tag = tag
+        self.data_type = data_type
+        self.value = None
+        self.last_value = None
+        self.guarantee_sec = guarantee_sec
+        self.chg_threshold = change_threshold
+        self.last_send_time = 0
+        self.mapFn = mapFn
+        self.plc_type = plc_type
+        self.readFn = readTag
+        if self.plc_type == "u800":
+            self.readFn = u800.readTag
+
+    def read(self, forceSend):
+        writeToDB = False
+        if self.tag:
+            v = readFn(PLC_IP_ADDRESS, self.tag)
+            if v:
+                if self.data_type == 'BOOL' or self.data_type == 'STRING':
+                    val = v[0]
+                    if self.mapFn:
+                        val = self.mapFn[val]
+                    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):
+                        self.last_value = self.value
+                        self.value = val
+                        writeToDB =  True
+                    else:
+                        writeToDB =  False
+                else:
+                    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):
+                        self.last_value = self.value
+                        self.value = v[0]
+                        writeToDB =  True
+                    else:
+                        writeToDB =  False
+        if writeToDB:
+            self.sendToDB()
+
+    def sendToDB(self):
+        query = "INSERT INTO tag_vals (dtime, name, val) VALUES ({}, '{}', {})".format(time.time(), self.name, self.value)
+        print query
+        # TODO: CHECK ON THIS LOGIC -- with con:
+        cur = con.cursor()
+        cur.execute(query)
+        con.commit()
+        cur.close()