How do I set up notify to watch a directory recursively in Go?

Use the Watch function with a path and event channel, and enable recursive watching via flags; the GoDoc provides code examples for configuring this with event filtering for specific changes.

Notify vs fsnotify: which is better for file monitoring in Go?

Notify offers a more abstracted API with built-in recursive watching and cross-platform consistency, while fsnotify is simpler but may require manual handling for some features. Choose notify for robust multi-OS support and advanced filtering.

Does notify work on Windows with network or virtual drives?

It relies on ReadDirectoryChangesW on Windows, which has limitations with remote paths; support varies by OS and filesystem, so test thoroughly for network drive scenarios.

How can I filter only file write events with notify?

Set up your watcher to listen only to the notify.Write event constant, and use the event channel to handle those specific notifications, as detailed in the library's documentation.

Is notify actively maintained and stable for production use?

Based on the README with build status badges and usage by projects like Syncthing, it appears well-maintained, but check GitHub for recent commits and issue activity to confirm.

What are the performance costs of using notify on large directory trees?

While native APIs are efficient, monitoring thousands of files can incur overhead; benchmark with your use case and consider rate limiting or selective watching to optimize.

notify — Cross-Platform File Events for Go

What is notify?

Notify is a Go library that provides cross-platform file system event notifications by abstracting native OS APIs like inotify (Linux), FSEvents (macOS), kqueue (BSD), and ReadDirectoryChangesW (Windows). It solves the problem of writing portable file monitoring code that works consistently across different operating systems without requiring platform-specific implementations.

Target Audience

Go developers who need to monitor file system changes in applications that must run on multiple operating systems, such as build tools, sync utilities, or development servers.

Value Proposition

Developers choose Notify because it offers a single, unified API for file system event handling across all major platforms, eliminating the need to write and maintain separate code for each OS. Its use of native OS APIs ensures high performance and reliability.

File system event notification library on steroids.

Use Cases

Best For

Building cross-platform file synchronization tools
Creating development servers that reload on file changes
Implementing real-time file monitoring for backup applications
Writing build tools that react to source code modifications
Developing utilities that watch configuration files for updates
Monitoring log files for new entries in multi-OS environments

Not Ideal For

Projects exclusively targeting a single OS where native APIs offer more control and less overhead
Applications requiring real-time monitoring of non-file system events like network sockets or processes
Embedded or resource-constrained environments where the cross-platform abstraction adds unnecessary complexity
Teams needing a zero-dependency solution for minimalistic or security-critical codebases

Pros & Cons

Pros

Cross-Platform Unified API

Abstracts inotify, FSEvents, kqueue, and ReadDirectoryChangesW into a single interface, enabling portable code without OS-specific implementations, as highlighted in the GitHub description.

High Performance Native Integration

Leverages OS-native file system event mechanisms for efficient, low-latency notifications, ensuring reliability in performance-critical applications like sync tools.

Recursive Directory Watching

Supports monitoring entire directory trees, which is essential for build tools and development servers that react to changes in nested files.

Event Type Filtering

Allows filtering specific events like create, write, rename, or remove, reducing callback noise and improving application efficiency.

Cons

Platform-Specific Quirks

Underlying OS APIs have inherent differences, which can lead to inconsistent behavior across platforms (e.g., event ordering or support for network drives), requiring thorough cross-platform testing.

Dependency Overhead

Adds an external library dependency, which might be undesirable for projects aiming for minimalism or those with strict security review processes.

Limited to File System

Only handles file system events, not other system notifications (e.g., process or network changes), potentially necessitating additional libraries for broader monitoring needs.

Frequently Asked Questions

What is notify?

Target Audience

Go developers who need to monitor file system changes in applications that must run on multiple operating systems, such as build tools, sync utilities, or development servers.

Value Proposition

Use Cases

Best For

Building cross-platform file synchronization tools
Creating development servers that reload on file changes
Implementing real-time file monitoring for backup applications
Writing build tools that react to source code modifications
Developing utilities that watch configuration files for updates
Monitoring log files for new entries in multi-OS environments

Not Ideal For

Projects exclusively targeting a single OS where native APIs offer more control and less overhead
Applications requiring real-time monitoring of non-file system events like network sockets or processes
Embedded or resource-constrained environments where the cross-platform abstraction adds unnecessary complexity
Teams needing a zero-dependency solution for minimalistic or security-critical codebases

Pros & Cons

Pros

Cross-Platform Unified API

Abstracts inotify, FSEvents, kqueue, and ReadDirectoryChangesW into a single interface, enabling portable code without OS-specific implementations, as highlighted in the GitHub description.

High Performance Native Integration

Leverages OS-native file system event mechanisms for efficient, low-latency notifications, ensuring reliability in performance-critical applications like sync tools.

Recursive Directory Watching

Supports monitoring entire directory trees, which is essential for build tools and development servers that react to changes in nested files.

Event Type Filtering

Allows filtering specific events like create, write, rename, or remove, reducing callback noise and improving application efficiency.

Cons

Platform-Specific Quirks

Underlying OS APIs have inherent differences, which can lead to inconsistent behavior across platforms (e.g., event ordering or support for network drives), requiring thorough cross-platform testing.

Dependency Overhead

Adds an external library dependency, which might be undesirable for projects aiming for minimalism or those with strict security review processes.

Limited to File System

Only handles file system events, not other system notifications (e.g., process or network changes), potentially necessitating additional libraries for broader monitoring needs.

Frequently Asked Questions

notify

What is notify?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

notify

What is notify?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?