From 6187faf20384b0c5a4966343b2d4ca47f8b11e45 Mon Sep 17 00:00:00 2001
From: Philip Paquette <pcpaquette@gmail.com>
Date: Wed, 26 Sep 2018 07:48:55 -0400
Subject: Release v1.0.0 - Diplomacy Game Engine - AGPL v3+ License

---
 diplomacy/engine/message.py | 115 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 diplomacy/engine/message.py

(limited to 'diplomacy/engine/message.py')

diff --git a/diplomacy/engine/message.py b/diplomacy/engine/message.py
new file mode 100644
index 0000000..2d6d644
--- /dev/null
+++ b/diplomacy/engine/message.py
@@ -0,0 +1,115 @@
+# ==============================================================================
+# Copyright (C) 2019 - Philip Paquette
+#
+#  This program is free software: you can redistribute it and/or modify it under
+#  the terms of the GNU Affero General Public License as published by the Free
+#  Software Foundation, either version 3 of the License, or (at your option) any
+#  later version.
+#
+#  This program is distributed in the hope that it will be useful, but WITHOUT
+#  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU Affero General Public License along
+#  with this program.  If not, see <https://www.gnu.org/licenses/>.
+# ==============================================================================
+""" Game message. Represent a message exchanged inside a game.
+
+    Possible messages exchanges:
+    - power 1 -> power 2
+    - power -> all game
+    - system -> power
+    - system -> all game
+    - system -> observers
+    - system -> omniscient observers
+
+    Sender `system` is identified with constant SYSTEM defined below.
+    Recipients `all game`, `observers` and `omniscient observers` are identified respectively with constants
+    GLOBAL, OBSERVER and OMNISCIENT defined below.
+
+    Consider using Game methods to generate appropriate messages instead of this class directly:
+    - Game.new_power_message() to send a message from a power to another.
+    - Game.new_global_message() to send a message from a power to all game.
+    - ServerGame.new_system_message() to send a server system message.
+      Use constant names defined below to specify recipient for system message when it's not a power name
+      (GLOBAL, OBSERVER or OMNISCIENT).
+"""
+from diplomacy.utils import parsing, strings
+from diplomacy.utils.jsonable import Jsonable
+
+SYSTEM = 'SYSTEM'  # sender
+GLOBAL = 'GLOBAL'  # recipient (all powers)
+OBSERVER = 'OBSERVER'  # recipient (all observer tokens)
+OMNISCIENT = 'OMNISCIENT'  # recipient (all omniscient tokens)
+
+class Message(Jsonable):
+    """ GameMessage class. Properties:
+        - sender: message sender name: either SYSTEM or a power name.
+        - recipient: message recipient name: either GLOBAL, OBSERVER, OMNISCIENT or a power name.
+        - time_sent: message timestamp in microseconds.
+        - phase: short name of game phase when message is sent.
+        - message: message body.
+
+        Note about timestamp management:
+        We assume a message has an unique timestamp inside one game. To respect this rule, the server is the only one
+        responsible for generating message timestamps. This allow to generate timestamp or only 1 same machine (server)
+        instead of managing timestamps from many user machines, to prevent timestamp inconsistency when messages
+        are stored on server. Therefore, message timestamp is the time when server stores the message, not the time
+        when message was sent by any client.
+    """
+    __slots__ = ['sender', 'recipient', 'time_sent', 'phase', 'message']
+    model = {
+        strings.SENDER: str,  # either SYSTEM or a power name.
+        strings.RECIPIENT: str,  # either GLOBAL, OBSERVER, OMNISCIENT or a power name.
+        strings.TIME_SENT: parsing.OptionalValueType(int),  # given by server.
+        strings.PHASE: str,  # phase short name.
+        strings.MESSAGE: str,
+    }
+
+    def __init__(self, **kwargs):
+        self.sender = None  # type: str
+        self.recipient = None  # type: str
+        self.time_sent = None  # type: int
+        self.phase = None  # type: str
+        self.message = None  # type: str
+        super(Message, self).__init__(**kwargs)
+
+    def __str__(self):
+        return '[%d/%s/%s->%s](%s)' % (
+            self.time_sent, self.phase, self.sender, self.recipient, self.message)
+
+    def __hash__(self):
+        return hash(self.time_sent)
+
+    def __eq__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent == other.time_sent
+
+    def __ne__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent != other.time_sent
+
+    def __lt__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent < other.time_sent
+
+    def __gt__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent > other.time_sent
+
+    def __le__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent <= other.time_sent
+
+    def __ge__(self, other):
+        assert isinstance(other, Message)
+        return self.time_sent >= other.time_sent
+
+    def is_global(self):
+        """ Return True if this message is global. """
+        return self.recipient == GLOBAL
+
+    def for_observer(self):
+        """ Return True if this message is sent to observers. """
+        return self.recipient == OBSERVER
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