arb_watchdog

arb_watchdog is a Python package designed to monitor and manage the status of specified processes. It uses Redis as a backend for storing process data and provides a simple API for interacting with this data. The package is highly configurable and can be used to monitor and manage a wide range of processes.

Features

• Monitor the status of specified processes
• Store process data in Redis
• Configurable process monitoring interval
• Automatically reloads configuration when the config file is updated
• Supports multiple processes
• Provides a simple API for interacting with process data

Installation

To install the arb_watchdog package, you can use pip:

pip install arb_watchdog

Config File

First, create a configuration file in JSON format with the following keys:

• redis_host: The hostname of your Redis server (e.g., "localhost")
• redis_port: The port number of your Redis server (e.g., 6379)
• interval: The interval (in seconds) at which the processes will be monitored (e.g., 60)
• processes: A list of process names to monitor (e.g., ["fake_process", "another_fake_process"])

Example configuration file (config.json):

{
  "redis_host": "localhost",
  "redis_port": 6379,
  "interval": 60,
  "processes": ["fake_process", "another_fake_process"]
}

By default, arb_watchdog will look for a configuration file under the $ARB_CONFIGS_PATH directory. ($ARB_CONFIGS_PATH/arb_watchdog_config.json). If this variable is not set, it will use ./arb_watchdog_config.json.

Usage

To use arb_watchdog, import the package and create a ProcessWatcher instance with the path to your configuration file:

from arb_watchdog.process_watcher import ProcessWatcher

config_file = "config.json"
process_watcher = ProcessWatcher(config_file=config_file)

You can then use the ProcessWatcher instance to perform various operations, such as getting the process list, updating process data, and getting process data for specified processes:

# Get the list of processes to monitor
process_list = process_watcher.get_process_list()

# Update process data
process_data = ProcessData(name="fake_process", pid=12345, status="UP")
process_watcher.update_process_data(process_data)

# Get process data for a specified process
process_data = process_watcher.get_process_data("fake_process")

Console Scripts

arb_watchdog provides two console scripts for easy interaction with the package: arb_watchdog and arb_watchdog_cli.

arb_watchdog

arb_watchdog is a console script that runs the arb_watchdog process in the background, continuously monitoring the specified processes and updating their data in Redis. To run the script, simply execute the following command in your terminal, replacing <config_file> with the path to your configuration file:

arb_watchdog -f <config_file>

arb_watchdog_cli

arb_watchdog_cli is a console script that shows data stored in the Redis database based on the config.json file

To run the script, execute the following command in your terminal, replacing <config_file> with the path to your configuration file:

arb_watchdog_cli -f <config_file>

Example output:

Running Tests

To run the tests for the arb_watchdog package, use the following command:

python -m unittest discover -s tests