godoxy-yusing/agent/pkg/handler

agent/pkg/handler

HTTP request handler package for the GoDoxy Agent.

Overview

This package provides the HTTP handler for the GoDoxy Agent server, including endpoints for:

• Version information
• Agent name and runtime
• Health checks
• System metrics (via SSE)
• HTTP proxy routing
• Docker socket proxying

Architecture

graph TD
    A[HTTP Request] --> B[NewAgentHandler]
    B --> C{ServeMux Router}

    C --> D[GET /version]
    C --> E[GET /name]
    C --> F[GET /runtime]
    C --> G[GET /health]
    C --> H[GET /system-info]
    C --> I[GET /proxy/http/#123;path...#125;]
    C --> J[ /#42; Docker Socket]

    H --> K[Gin Router]
    K --> L[WebSocket Upgrade]
    L --> M[SystemInfo Poller]

Public Types

ServeMux

type ServeMux struct{ *http.ServeMux }

Wrapper around http.ServeMux with agent-specific endpoint helpers.

Methods:

• HandleEndpoint(method, endpoint string, handler http.HandlerFunc) - Registers handler with API base path
• HandleFunc(endpoint string, handler http.HandlerFunc) - Registers GET handler with API base path

Public Functions

NewAgentHandler

func NewAgentHandler() http.Handler

Creates and configures the HTTP handler for the agent server. Sets up:

• Gin-based metrics handler with WebSocket support for SSE
• All standard agent endpoints
• HTTP proxy endpoint
• Docker socket proxy fallback

Endpoints

Endpoint	Method	Description
/version	GET	Returns agent version
/name	GET	Returns agent name
/runtime	GET	Returns container runtime
/health	GET	Health check with scheme query param
/system-info	GET	System metrics via SSE or WebSocket
/proxy/http/{path...}	GET/POST	HTTP proxy with config from headers
/*	*	Docker socket proxy

Sub-packages

proxy_http.go

Handles HTTP proxy requests by reading configuration from request headers and proxying to the configured upstream.

Key Function:

• ProxyHTTP(w, r) - Proxies HTTP requests based on X-Proxy-* headers

check_health.go

Handles health check requests for various schemes.

Key Function:

• CheckHealth(w, r) - Performs health checks with configurable scheme

Supported Schemes:

• http, https - HTTP health check
• h2c - HTTP/2 cleartext health check
• tcp, udp, tcp4, udp4, tcp6, udp6 - TCP/UDP health check
• fileserver - File existence check

Usage Example

package main

import (
    "net/http"
    "github.com/yusing/godoxy/agent/pkg/handler"
)

func main() {
    mux := http.NewServeMux()
    mux.Handle("/", handler.NewAgentHandler())

    http.ListenAndServe(":8890", mux)
}

WebSocket Support

The handler includes a permissive WebSocket upgrader for internal use (no origin check). This enables real-time system metrics streaming via Server-Sent Events (SSE).

Docker Socket Integration

All unmatched requests fall through to the Docker socket handler, allowing the agent to proxy Docker API calls when configured.