Added logging and retry

flaskpagethread.py

@@ -1,27 +1,44 @@
 from time import sleep
 from threading import Thread
+from logging import getLogger
 
 class FlaskPageThread(Thread):
     def __init__(self, delay, func, *args, **kwargs):
-        self.delay    = delay
-        self.func     = func
-        self.args     = args
-        self.page     = ("init", 500)
-        self.hhealthy = False
         name  = kwargs.get("name", "FlaskPageThread")
+        self.delay      = delay
+        self.func       = func
+        self.args       = args
+        self.page       = ("init", 500)
+        self.healthy    = False
+        self.retrycount = kwargs.get("retrycount", 3)
+        self.retrydelay = kwargs.get("retrydelay", 1)
+        self.log        = kwargs.get("log", getLogger(name))
+        self.log.debug("FlaskPageThread.__init__(%s)" % name)
         super().__init__(target=self.run, daemon=True, name=name)
 
     def genpage(self):
-        try:
-            data = self.func(*self.args)
-            self.page = (data, 200)
-            self.hhealthy = True
-        except Exception as e:
-            print("Exception: %s" % e)
-            self.page = ("Internal error", 500)
-            self.hhealthy = False
+        c = self.retrycount
+        while c > 0:
+            c-=1
+            try:
+                self.log.debug("FlaskPageThread.genpage()")
+                data = self.func(*self.args)
+                self.page = (data, 200)
+                self.healthy = True
+                c=0
+            except Exception as e:
+                print("Exception: %s" % e)
+                if c == 0:
+                    self.page = ("Internal error", 500)
+                    self.healthy = False
+                else:
+                   # retry
+                   self.log.warn("FlaskPageThread.genpage(): Retry %s"
+                                 % self.name)
+                   sleep(self.retrydelay)
 
     def run(self):
+        self.log.debug("FlaskPageThread.run()")
         self.genpage()
         while True:
             sleep(self.delay)