Handling nonexistent destination user

src/ctb/ctb_action.py

@@ -422,6 +422,13 @@ def validate(self, is_pending=False):
                 self.save('failed')
                 return False
 
+            if self.u_to and not self.u_to.is_on_reddit():
+                msg = self.ctb.jenv.get_template('not-on-reddit.tpl').render(a=self, ctb=self.ctb)
+                lg.debug("CtbAction::validate(): %s", msg)
+                self.u_from.tell(subj="+tip failed", msg=msg)
+                self.save('failed')
+                return False
+
             # Verify that coin type is set
             if not self.coin:
                 msg = self.ctb.jenv.get_template('no-coin-balances.tpl').render(a=self, ctb=self.ctb)

src/ctb/ctb_misc.py

@@ -42,6 +42,9 @@ def praw_call(prawFunc, *extraArgs, **extraKwArgs):
             if str(e) == "403 Client Error: Forbidden":
                 lg.warning("praw_call(): 403 forbidden")
                 return False
+            if str(e) == "404 Client Error: Not Found":
+                lg.warning("praw_call(): 404 not found")
+                return False
             lg.warning("praw_call(): Reddit is down (%s), sleeping...", e)
             time.sleep(30)
             pass

src/ctb/ctb_user.py

@@ -130,6 +130,8 @@ def is_on_reddit(self):
             self.prawobj = ctb_misc.praw_call(self.ctb.reddit.get_redditor, self.name)
             if self.prawobj:
                 return True
+            else:
+                return False
 
         except Exception as e:
             lg.debug("< CtbUser::is_on_reddit(%s) DONE (no)", self.name)

src/tpl/jinja2/not-on-reddit.tpl

@@ -0,0 +1,5 @@
+{% set user_from = a.u_from.name %}
+{% set user_to = a.u_to.name %}
+I'm sorry {{ user_from | replace('_', '\_') }}, your tip has failed because user **{{ user_to | replace('_', '\_') }}** is not on Reddit.
+
+{% include 'footer.tpl' %}