wgevents

Overview

wgevents is a logging package for wireguard-go. It transforms format strings and args passed to logger methods into concrete events.

Key Features

• Event-based Logging: Converts format strings and arguments into concrete logging events.
• Structured Logging Support: logs format arguments separate slog records. Integrates with slog.Logger.
• Wireguard-go Version Pinning: The package is designed as a separate module to pin to a specific version of wireguard-go. This ensures compatibility and stability even when wireguard-go messages change.

Installation

To use wgevents in your Go project, install it using go get:

go get github.com/point-c/wgevents

Usage

Events Function

The Events function creates a new device.Logger capable of recognizing names and types of arguments passed to logging methods.

func Events(fn func(Event)) *device.Logger

Parameters:

• fn func(Event): A callback function that is called for each event logged.

Returns:

• *device.Logger: A logger compatible with wireguard-go.

Event Handling

Each logged event is handled through the provided callback function. The package handles known events with specific types, and unknown events are categorized as EventAny.

Example

Basic Usage

logger := wgevents.Events(func(e wgevents.Event) {
    // Handle logging event
})
// Use logger in your application

Recognizing Events

A type switch can be used to recognize specific events:

switch ev := ev.(type) {
case *wgevents.EventAssumingDefaultMTU:
case *wgevents.EventBindCloseFailed:
case *wgevents.EventBindUpdated:
// And so on...
}

Logging

logger := wgevents.Events(func(e wgevents.Event) {
    e.Slog(slog.Default())
})

Contributing

This package allows for updates and additions of events. Modify internal/events-generate/events.yml and regenerate events_generated.go to update event handling.

File Layout

Each section under the events key corresponds to a specific event that can be logged:

<event name>:
    type: string
    level: string
    nice: string (optional)
    format: string
    args: list (optional)
    custom: bool (optional)

Key Definitions

• type: The type of logging or messaging method to be used. Only errorf for error logging, and verbosef for verbose logging are valid.

• level: The level at which the logging should occur. Valid values are debug, info, warn, and error.

• nice: An optional human-readable message for the event. If not specified format will be used.

• format: The format string used by the wireguard-go library.

• args: The arguments used in the format string in the following format:

  - <name>: <type>
  - <name>: <type>

• custom: An optional flag indicating that parsing this event requires custom logic to be implemented.

Imports

The final section of the configuration file lists the external packages used as part of the event processing mechanism. These are mentioned under the imports key.

Testing

The package includes tests that demonstrate its functionality. Use Go's testing tools to run the tests:

go test ./...

Godocs

To regenerate godocs:

go generate -tags docs ./...

Code Generation

To regenerate generated packages:

go generate ./...