ProdWatch

A faster, safer way to log and debug live code.

Installation & Setup

You can install prodwatch using pip:

pip install prodwatch

Prerequisites

• Python >= 3.13.
• A live monitoring server (host your own, or use ours).
• Environment variables:
  • PRODWATCH_API_TOKEN: Authentication for the monitoring server.
  • PRODWATCH_API_URL: Base URL (optional) for the monitoring server (yours or ours).

Basic Usage

from prodwatch import start_prodwatch

# Your application code
def some_function(a, b):
    return a + b

if __name__ == "__main__":
    start_prodwatch()

    # Hover over this function in your editor, and click to turn on logging.
    # ProdWatch will start logging these function calls immediately.
    # Wait a few moments, and you'll start seeing logs.
    # No added logging code, no config changes, no deploy required!
    some_function(4, 2)

Configuration

Environment Variables

Required for ProdWatch Operation

Variable	Description	Default	Required
PRODWATCH_API_TOKEN	Authentication token for monitoring server	None	Yes
PRODWATCH_API_URL	Base URL of monitoring server	https://getprodwatch.com	No

Optional for ProdWatch Internal Logging

These control how ProdWatch logs its own behavior (not your application's logs):

Variable	Description	Default	Required
PRODWATCH_LOG_LEVEL	Logging level (DEBUG, INFO, WARNING, ERROR)	INFO	No
PRODWATCH_LOG_FORMAT	Log output format (text, json)	text	No
PRODWATCH_LOG_FILE	Path to log file (enables file logging)	None	No

ProdWatch Internal Logging Configuration

You can configure logging for ProdWatch itself (as mentioned above, this is not to be confused with the logging ProdWatch does for your code).

Configuration Files

Place a prodwatch_logging.json file in your project root for custom logging setup:

{
  "version": 1,
  "formatters": {
    "standard": {
      "format": "%(asctime)s [%(name)s] [%(levelname)s] %(message)s"
    },
    "json": {
      "()": "prodwatch.logging_config.StructuredFormatter"
    }
  },
  "handlers": {
    "console": {
      "class": "logging.StreamHandler",
      "formatter": "standard"
    },
    "file": {
      "class": "logging.handlers.RotatingFileHandler",
      "filename": "prodwatch.log",
      "formatter": "json",
      "maxBytes": 10485760,
      "backupCount": 5
    }
  },
  "loggers": {
    "prodwatch": {
      "level": "DEBUG",
      "handlers": ["console", "file"]
    }
  }
}

Environment-Based Configuration

• PRODWATCH_LOG_FORMAT=json enables JSON structured logging
• PRODWATCH_LOG_FILE=app.log enables file logging with rotation

Server Endpoints

The monitoring server should implement the following endpoints:

• GET /pending-function-names?process_id={id}: Returns list of functions to monitor.
• POST /events: Receives monitoring events (process registration, function calls, confirmations).

API Reference

Just One Function!

start_prodwatch()

Initializes and starts ProdWatch.

Behavior:

• Creates Manager instance with monitoring server URL
• Checks server connection
• Starts polling loop in a background thread
• Listens for requests (from VS Code) to monitor specific functions.
• Sends function-call data to the monitoring server.

Exception Classes

ProdwatchError

Base exception for all Prodwatch-related errors.

TokenError

Raised when API token is missing or invalid.