Refactor: Improve testability of LogTool

tools/log_tool.py

@@ -1,5 +1,4 @@
 # tools/log_tool.py
-
 from .base_tool import BaseTool
 from .metrics import metrics
 import logging
@@ -7,48 +6,39 @@ import os
 from datetime import datetime, timedelta
 
 class LogTool(BaseTool):
-    def __init__(self):
-        # Set up logging
-        self.logger = logging.getLogger(__name__)
-        self.logger.setLevel(logging.INFO)
+    # Default log format string that _get_log_contents expects for time-based filtering.
+    # Making it a class variable so it's visible and could be overridden by a subclass if needed,
+    # though the parser is still hardcoded in this version.
+    EXPECTED_LOG_TIMESTAMP_FORMAT = '%Y-%m-%d %H:%M:%S,%f'
 
-        # Create a file handler
-        file_handler = logging.FileHandler('log_tool.log')
-        file_handler.setLevel(logging.INFO)
-        
-        # Create a console handler
-        console_handler = logging.StreamHandler()
-        console_handler.setLevel(logging.INFO)
-        
-        # Create a formatting for the logs
-        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
-        file_handler.setFormatter(formatter)
-        console_handler.setFormatter(formatter)
-        
-        # Add the handlers to the logger
-        self.logger.addHandler(file_handler)
-        self.logger.addHandler(console_handler)
+    def __init__(self, log_file_path=None, logger=None):
+        self.configured_log_file_path = log_file_path if log_file_path else 'logs/output.log'
+        self.logger = logger if logger else logging.getLogger(__name__)
+        if not self.logger.handlers:
+            self.logger.addHandler(logging.NullHandler())
+        self.logger.info(f"LogTool initialized. Log file path: {self.configured_log_file_path}")
 
     def clear(self):
+        # No specific state to clear for LogTool in this version.
+        self.logger.debug("LogTool clear called, no action taken.")
         pass
 
     def get_functions(self):
-        
         return [
             {
                 "type": "function",
                 "function": {
                     "name": "get_log_contents",
-                    "description": "Get the contents of the log file.",
+                    "description": "Get the contents of the log file. If line_count is not provided, it attempts to return logs from the last 24 hours based on timestamp.",
                     "parameters": {
                         "type": "object",
                         "properties": {
                             "line_count": {
                                 "type": "integer",
-                                "description": "Number of lines from the end of the log file to retrieve"
+                                "description": "Number of lines from the end of the log file to retrieve. If omitted, logs from last 24 hours are returned."
                             }
                         },
-                        "required": []
+                        "required": [] # line_count is optional
                     }
                 }
             }
@@ -56,37 +46,60 @@ class LogTool(BaseTool):
 
     @metrics.measure
     def execute(self, function_name, **kwargs):
-        self.logger.info(f"Executing: {function_name}")
-        
+        self.logger.info(f"Executing LogTool function: {function_name} with args: {kwargs}")
         if function_name == "get_log_contents":
-            return self._get_log_contents(kwargs.get("line_count"))
+            # kwargs.get("line_count") will be None if not provided, which is handled by _get_log_contents
+            return self._get_log_contents(line_count=kwargs.get("line_count"))
         else:
             error_message = f"Unknown function: {function_name}"
             self.logger.error(error_message)
             return error_message
 
     @metrics.measure
-    def _get_log_contents(self, line_count=150):
-        log_file_path = 'logs/output.log'
+    def _get_log_contents(self, line_count=None): # Default line_count is None to trigger 24h logic if not specified
+        self.logger.info(f"Attempting to get log contents from: {self.configured_log_file_path}. Line count: {line_count if line_count is not None else 'Last 24 hours'}")
         
-        if not os.path.exists(log_file_path):
-            error_message = "Log file does not exist."
+        if not os.path.exists(self.configured_log_file_path):
+            error_message = f"Log file does not exist at path: {self.configured_log_file_path}"
             self.logger.error(error_message)
             return error_message
 
         try:
-            with open(log_file_path, 'r') as log_file:
+            with open(self.configured_log_file_path, 'r', encoding='utf-8') as log_file:
                 log_lines = log_file.readlines()
+            self.logger.debug(f"Read {len(log_lines)} total lines from log file.")
 
             if line_count is not None:
+                # Ensure line_count is positive if specified, otherwise could lead to unexpected slicing
+                if not isinstance(line_count, int) or line_count <= 0:
+                    self.logger.warning(f"Invalid line_count '{line_count}' provided, defaulting to fetch last 150 lines.")
+                    line_count = 150 # Default to a sensible number if invalid value provided
                 log_lines = log_lines[-line_count:]
+                self.logger.info(f"Returning last {len(log_lines)} lines based on line_count: {line_count}")
             else:
+                # Default to last 24 hours if line_count is explicitly None or not provided
+                self.logger.info(f"Filtering logs for the last 24 hours. Expected timestamp format: {self.EXPECTED_LOG_TIMESTAMP_FORMAT}")
                 now = datetime.now()
                 twenty_four_hours_ago = now - timedelta(days=1)
-                    log_lines = [line for line in log_lines if datetime.strptime(line.split(' - ')[0], '%Y-%m-%d %H:%M:%S,%f') > twenty_four_hours_ago]
+                
+                filtered_lines = []
+                for line in log_lines:
+                    try:
+                        # Attempt to parse timestamp from the beginning of the line
+                        timestamp_str = line.split(' - ', 1)[0]
+                        log_time = datetime.strptime(timestamp_str, self.EXPECTED_LOG_TIMESTAMP_FORMAT)
+                        if log_time > twenty_four_hours_ago:
+                            filtered_lines.append(line)
+                    except (ValueError, IndexError) as e:
+                        # This means the line doesn't start with a parsable timestamp in the expected format.
+                        # Depending on requirements, these lines might be skipped or included.
+                        # For strict 24-hour filtering, we skip them.
+                        self.logger.debug(f"Skipping line due to timestamp parse error ('{e}') or format mismatch: {line.strip()[:100]}...")
+                log_lines = filtered_lines
+                self.logger.info(f"Returning {len(log_lines)} lines from the last 24 hours.")
 
             return "".join(log_lines)
         except Exception as e:
-            error_message = f"An error occurred while reading the log file: {e}"
-            self.logger.error(error_message)
+            error_message = f"An error occurred while reading the log file '{self.configured_log_file_path}': {e}"
+            self.logger.error(error_message, exc_info=True)
             return error_message