Handle operation failure in api.

api/async_bot.py

@@ -8,6 +8,7 @@ import asyncio
 from contextlib import contextmanager
 
 from bot_z.async_operator import AsyncOperator
+from bot_z.exceptions import OperationFailed
 
 
 @contextmanager
@@ -31,7 +32,10 @@ async def login(op: AsyncOperator, username: str, password: str) -> bool:
     the AsyncOperator object.
     """
     if not op.logged_in:
-        await op.login(username, password)
+        try:
+            await op.login(username, password)
+        except OperationFailed:
+            pass
     return op.logged_in
 
 
@@ -41,7 +45,10 @@ async def logout(op: AsyncOperator) -> bool:
     a bool showing the success or failure of the operation.
     """
     if op.logged_in:
-        await op.logout()
+        try:
+            await op.logout()
+        except OperationFailed:
+            pass
     return op.logged_in
 
 
@@ -51,7 +58,10 @@ async def checkin(op: AsyncOperator) -> bool:
     a bool showing the success or failure of the operation.
     """
     if op.logged_in and not op.checked_in:
-        await op.checkin()
+        try:
+            await op.checkin()
+        except OperationFailed:
+            pass
     return op.checked_in
 
 
@@ -61,5 +71,8 @@ async def checkout(op: AsyncOperator) -> bool:
     a bool showing the success or failure of the operation.
     """
     if op.logged_in and op.checked_in:
-        await op.checkout()
+        try:
+            await op.checkout()
+        except OperationFailed:
+            pass
     return not op.checked_in

bot_z/async_operator.py

@@ -12,6 +12,7 @@ import functools
 import logging
 
 from bot_z.operator import Operator
+from bot_z.exceptions import OperationFailed
 
 
 alog = logging.getLogger("asyncio")
@@ -26,6 +27,7 @@ async def _push_to_loop(loop, executor, func, *args, **kwargs):
     return res.result()
 
 
+# TODO: make it JSON-serializable
 class AsyncOperator(object):
     """
     This is the async version of the Operator.
@@ -47,7 +49,7 @@ class AsyncOperator(object):
             self.loop, self.executor, self.op.login, username, password
         )
         if not self.op.logged_in:
-            raise RuntimeError("Failed to login.")
+            raise OperationFailed("Failed to login.")
         alog.info("Logged in [%s]", self.name)
 
     async def logout(self) -> None:
@@ -55,7 +57,7 @@ class AsyncOperator(object):
         alog.debug("Logging out [%s]", self.name)
         _ = await _push_to_loop(self.loop, self.executor, self.op.logout)
         if self.op.logged_in:
-            raise RuntimeError("Failed to logout.")
+            raise OperationFailed("Failed to logout.")
         alog.info("Logged out [%s]", self.name)
 
     async def checkin(self) -> None:
@@ -63,7 +65,7 @@ class AsyncOperator(object):
         alog.debug("Checking in [%s]", self.name)
         _ = await _push_to_loop(self.loop, self.executor, self.op.check_in)
         if not self.op.checked_in:
-            raise RuntimeError("Failed to checkin.")
+            raise OperationFailed("Failed to checkin.")
         alog.info("Checked in [%s]", self.name)
 
     async def checkout(self) -> None:
@@ -71,7 +73,7 @@ class AsyncOperator(object):
         alog.debug("Checking out [%s]", self.name)
         _ = await _push_to_loop(self.loop, self.executor, self.op.check_out)
         if self.op.checked_in:
-            raise RuntimeError("Failed to checkout.")
+            raise OperationFailed("Failed to checkout.")
         alog.info("Checked out [%s]", self.name)
 
     @property

bot_z/exceptions.py

@@ -0,0 +1,2 @@
+class OperationFailed(RuntimeError):
+    pass