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healthcheck.go
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healthcheck.go
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package main
import (
"bufio"
"io"
"net"
"os"
"strings"
)
func isLinkUp(interfaceName string) bool {
content, err := os.ReadFile("/sys/class/net/" + interfaceName + "/carrier")
if err != nil {
return false
}
return strings.TrimSpace(string(content)) == "1"
}
func handleConnection(conn net.Conn) {
defer conn.Close() // Ensure each connection is closed after handling
// Read the request (we don't need to parse it for this simple healthcheck)
bufio.NewReader(conn).ReadString('\n')
status := "KO"
statusCode := "503 Service Unavailable"
if isLinkUp("wg0") {
status = "OK"
statusCode = "200 OK"
}
// Write HTTP response
io.WriteString(conn, "HTTP/1.1 "+statusCode+"\r\n")
io.WriteString(conn, "Content-Type: text/plain\r\n")
io.WriteString(conn, "\r\n")
io.WriteString(conn, "status: "+status+"\n")
}
func main() {
port := "8080" // Default port
if envPort := os.Getenv("HEALTHCHECK_PORT"); envPort != "" {
port = envPort
}
listener, err := net.Listen("tcp", ":"+port)
if err != nil {
os.Stderr.WriteString("Failed to start server: " + err.Error() + "\n")
os.Exit(1)
}
defer listener.Close()
// Accept new connections and handle each in a separate goroutine
for {
conn, err := listener.Accept()
if err != nil {
continue // If accept fails, continue to next connection
}
go handleConnection(conn)
}
}