Merge branch 'daemon-rework' into develop

CHANGELOG.md

@@ -1,3 +1,7 @@
+## Unreleased
+### Added
+- Daemons can now accept an interval value, removing the need for a manual while True loop
+
 ## v0.1 (2020/08/26)
 
 ### Added

frank/frank.py

@@ -88,7 +88,10 @@ class Frank(discord.Client):
         except ValueError:
             return
 
-        if cmd and cmd[0] == self.PREFIX:
+        # Exit if no commands are given or prefix is wrong
+        if not (cmd and cmd[0] == self.PREFIX):
+            return
+
         module = next((mod for mod in self._loaded_modules
                        if mod.match(cmd[1])), None)
 

frank/module/decorators/classes.py

@@ -4,6 +4,13 @@ from __future__ import annotations
 
 # Built-in imports
 import re
+import asyncio
+
+# Typing imports
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    # Built-in imports
+    from typing import Union
 
 
 class Simple:
@@ -95,16 +102,37 @@ class RegexCommand(Command):
 
 class Daemon(Simple):
     """
-    Represents a daemon. Currently, it's only used as its own type, but writing
-    it this way allows us to easily expand upon its functionality later.
+    Represents a daemon a.k.a. a background process.
     """
 
-    pass
+    def __init__(self, func: callable, interval: Union[int, float] = 0):
+        """
+        Args
+            func: function to wrap
+            interval: time between calls of the function; if < 0, the function
+            is assumed to contain its own infinite loop, allowing for
+            fine-grained control of the daemon, if desired
+        """
+
+        super().__init__(func)
+        self.interval = interval
+
+        # If an interval > 0 is given, it wraps the function inside an infinite
+        # loop with the desired delay
+        if interval > 0:
+            async def loop(self, *args, **kwargs):
+                while True:
+                    # TODO: does this make func and sleep run at the same time?
+                    await func(self, *args, **kwargs)
+
+                    await asyncio.sleep(interval)
+
+            self.func = loop
 
 
 class Default(Simple):
     """
-    Represents a default command (a.k.a. when the module is called without a
+    Represents a default command a.k.a. when the module is called without a
     command.
     """
 

frank/module/decorators/functions.py

@@ -1,7 +1,16 @@
 # =====IMPORTS=====
+# Future imports
+from __future__ import annotations
+
 # Own imports
 from .classes import Command, RegexCommand, Daemon, Default
 
+# Typing imports
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    # Built-in imports
+    from typing import Union
+
 
 def command(cmd, help_str: str = None) -> callable:
     """
@@ -33,14 +42,14 @@ def regex_command(pattern: str, help_str: str = None) -> callable:
     return inner
 
 
-def daemon() -> callable:
+def daemon(interval: Union[int, float] = 0) -> callable:
     """
     Converts the method into a Daemon, which will then be run when the module
     is started.
     """
 
     def inner(func):
-        return Daemon(func)
+        return Daemon(func, interval)
 
     return inner
 

frank/module/module.py

@@ -100,7 +100,10 @@ class Module(ModuleMeta):
             func = next((func for func in self.commands
                          if func.match(cmd[0])), None)
 
-            if func:
+            # Throw error if no function is found
+            if not func:
+                raise InvalidCommand(f'Unknown command: {cmd}')
+
             # A RegexCommand can use the prefix, as it's not a fixed string
             if isinstance(func, RegexCommand):
                 await func(prefix=cmd[0], cmd=cmd[1:], author=author,
@@ -110,9 +113,6 @@ class Module(ModuleMeta):
                 await func(cmd=cmd[1:], author=author, channel=channel,
                            mid=mid)
 
-            else:
-                raise InvalidCommand(f'Unknown command: {cmd}')
-
         elif self.default:
             await self.default(author=author, channel=channel, mid=mid)
 
@@ -125,12 +125,12 @@ class Module(ModuleMeta):
             prefix: prefix to check
         """
 
-        if cls.PREFIX:
+        # Always return False if there's no PREFIX defined
+        if not cls.PREFIX:
+            return False
+
         if isinstance(cls.PREFIX, list):
             return prefix in cls.PREFIX
 
         else:
             return prefix == cls.PREFIX
-
-        else:
-            return False

tests/test_decorators.py

@@ -1,4 +1,7 @@
 # =====IMPORTS=====
+# Third-party imports
+import pytest
+
 # Own imports
 from frank import default, command, daemon
 
@@ -27,7 +30,7 @@ class TestDecorators:
         return 'daemon'
 
     @daemon()
-    def daemon_dec(self):
+    async def daemon_dec(self):
         return self.daemon_no_dec()
 
     def test_default(self):
@@ -36,5 +39,6 @@ class TestDecorators:
     def test_command(self):
         assert self.command_no_dec() == self.command_dec()
 
-    def test_daemon(self):
-        assert self.daemon_no_dec() == self.daemon_dec()
+    @pytest.mark.asyncio
+    async def test_daemon(self):
+        assert self.daemon_no_dec() == await self.daemon_dec()