#2716 Initial Implementation + Initial Tests and updated changelog and sphinx documentation.

src/primaite/game/agent/agent_log.py

@@ -0,0 +1,168 @@
+# © Crown-owned copyright 2024, Defence Science and Technology Laboratory UK
+import logging
+from pathlib import Path
+
+from prettytable import MARKDOWN, PrettyTable
+
+from primaite.simulator import LogLevel, SIM_OUTPUT
+
+
+class _NotJSONFilter(logging.Filter):
+    def filter(self, record: logging.LogRecord) -> bool:
+        """
+        Determines if a log message does not start and end with '{' and '}' (i.e., it is not a JSON-like message).
+
+        :param record: LogRecord object containing all the information pertinent to the event being logged.
+        :return: True if log message is not JSON-like, False otherwise.
+        """
+        return not record.getMessage().startswith("{") and not record.getMessage().endswith("}")
+
+
+class AgentLog:
+    """
+    A Agent Log class is a simple logger dedicated to managing and writing logging updates and information for an agent.
+
+    Each log message is written to a file located at: <simulation output directory>/agent/agent_name.log
+    """
+
+    def __init__(self, agent_name: str):
+        """
+        Constructs a Agent Log instance for a given hostname.
+
+        :param hostname: The hostname associated with the system logs being recorded.
+        """
+        self.agent_name = agent_name
+        self.current_episode: int = 1
+        self.setup_logger()
+
+    def setup_logger(self):
+        """
+        Configures the logger for this Agent Log instance.
+
+        The logger is set to the DEBUG level, and is equipped with a handler that writes to a file and filters out
+        JSON-like messages.
+        """
+        if not SIM_OUTPUT.save_agent_logs:
+            return
+
+        log_path = self._get_log_path()
+        file_handler = logging.FileHandler(filename=log_path)
+        file_handler.setLevel(logging.DEBUG)
+
+        log_format = "%(timestep)s::%(levelname)s::%(message)s"
+        file_handler.setFormatter(logging.Formatter(log_format))
+
+        self.logger = logging.getLogger(f"{self.agent_name}_log")
+        for handler in self.logger.handlers:
+            self.logger.removeHandler(handler)
+        self.logger.setLevel(logging.DEBUG)
+        self.logger.addHandler(file_handler)
+
+    def _get_log_path(self) -> Path:
+        """
+        Constructs the path for the log file based on the hostname.
+
+        :return: Path object representing the location of the log file.
+        """
+        root = SIM_OUTPUT.path / f"episode_{self.current_episode}" / "agent_logs" / self.agent_name
+        root.mkdir(exist_ok=True, parents=True)
+        return root / f"{self.agent_name}.log"
+
+    def _write_to_terminal(self, msg: str, timestep: int, level: str, to_terminal: bool = False):
+        if to_terminal or SIM_OUTPUT.write_agent_log_to_terminal:
+            print(f"{self.agent_name}: ({timestep}) ({level}) {msg}")
+
+    def debug(self, msg: str, time_step: int, to_terminal: bool = False):
+        """
+        Logs a message with the DEBUG level.
+
+        :param msg: The message to be logged.
+        :param to_terminal: If True, prints to the terminal too.
+        """
+        if SIM_OUTPUT.agent_log_level > LogLevel.DEBUG:
+            return
+
+        if SIM_OUTPUT.save_agent_logs:
+            self.logger.debug(msg, extra={"timestep": time_step})
+        self._write_to_terminal(msg, "DEBUG", to_terminal)
+
+    def info(self, msg: str, time_step: int, to_terminal: bool = False):
+        """
+        Logs a message with the INFO level.
+
+        :param msg: The message to be logged.
+        :param timestep: The current timestep.
+        :param to_terminal: If True, prints to the terminal too.
+        """
+        if SIM_OUTPUT.agent_log_level > LogLevel.INFO:
+            return
+
+        if SIM_OUTPUT.save_agent_logs:
+            self.logger.info(msg, extra={"timestep": time_step})
+        self._write_to_terminal(msg, "INFO", to_terminal)
+
+    def warning(self, msg: str, time_step: int, to_terminal: bool = False):
+        """
+        Logs a message with the WARNING level.
+
+        :param msg: The message to be logged.
+        :param timestep: The current timestep.
+        :param to_terminal: If True, prints to the terminal too.
+        """
+        if SIM_OUTPUT.agent_log_level > LogLevel.WARNING:
+            return
+
+        if SIM_OUTPUT.save_agent_logs:
+            self.logger.warning(msg, extra={"timestep": time_step})
+        self._write_to_terminal(msg, "WARNING", to_terminal)
+
+    def error(self, msg: str, time_step: int, to_terminal: bool = False):
+        """
+        Logs a message with the ERROR level.
+
+        :param msg: The message to be logged.
+        :param timestep: The current timestep.
+        :param to_terminal: If True, prints to the terminal too.
+        """
+        if SIM_OUTPUT.agent_log_level > LogLevel.ERROR:
+            return
+
+        if SIM_OUTPUT.save_agent_logs:
+            self.logger.error(msg, extra={"timestep": time_step})
+        self._write_to_terminal(msg, "ERROR", to_terminal)
+
+    def critical(self, msg: str, time_step: int, to_terminal: bool = False):
+        """
+        Logs a message with the CRITICAL level.
+
+        :param msg: The message to be logged.
+        :param timestep: The current timestep.
+        :param to_terminal: If True, prints to the terminal too.
+        """
+        if LogLevel.CRITICAL < SIM_OUTPUT.agent_log_level:
+            return
+
+        if SIM_OUTPUT.save_agent_logs:
+            self.logger.critical(msg, extra={"timestep": time_step})
+        self._write_to_terminal(msg, "CRITICAL", to_terminal)
+
+    def show(self, last_n: int = 10, markdown: bool = False):
+        """
+        Print an Agents Log as a table.
+
+        Generate and print PrettyTable instance that shows the agents behaviour log, with columns Time step,
+        Level and Message.
+
+        :param markdown: Use Markdown style in table output. Defaults to False.
+        """
+        table = PrettyTable(["Time Step", "Level", "Message"])
+        if markdown:
+            table.set_style(MARKDOWN)
+        table.align = "l"
+        table.title = f"{self.agent_name} Behaviour Log"
+        if self._get_log_path().exists():
+            with open(self._get_log_path()) as file:
+                lines = file.readlines()
+            for line in lines[-last_n:]:
+                table.add_row(line.strip().split("::"))
+        print(table)