hola-proxy/credservice.go

package main

import (
	"context"
	"sync"
	"time"
)

const DEFAULT_LIST_LIMIT = 3
const API_CALL_ATTEMPTS = 3

func CredService(interval, timeout time.Duration,
	country string,
	proxytype string,
	logger *CondLogger) (auth AuthProvider,
	tunnels *ZGetTunnelsResponse,
	err error) {
	var mux sync.Mutex
	var auth_header, user_uuid string
	auth = func() (res string) {
		(&mux).Lock()
		res = auth_header
		(&mux).Unlock()
		return
	}

	for i := 0; i < API_CALL_ATTEMPTS; i++ {
		ctx, _ := context.WithTimeout(context.Background(), timeout)
		tunnels, user_uuid, err = Tunnels(ctx, country, proxytype, DEFAULT_LIST_LIMIT)
		if err == nil {
			break
		}
	}
	if err != nil {
		logger.Critical("Configuration bootstrap failed: %v", err)
		return
	}
	auth_header = basic_auth_header(LOGIN_PREFIX+user_uuid,
		tunnels.AgentKey)
	go func() {
		var (
			err       error
			tuns      *ZGetTunnelsResponse
			user_uuid string
		)
		ticker := time.NewTicker(interval)
		defer ticker.Stop()
		for {
			<-ticker.C
			logger.Info("Rotating credentials...")
			for i := 0; i < API_CALL_ATTEMPTS; i++ {
				ctx, _ := context.WithTimeout(context.Background(), timeout)
				tuns, user_uuid, err = Tunnels(ctx, country, proxytype, DEFAULT_LIST_LIMIT)
				if err == nil {
					break
				}
			}
			if err != nil {
				logger.Error("Credential rotation failed after %d attempts. Error: %v",
					API_CALL_ATTEMPTS, err)
			} else {
				(&mux).Lock()
				auth_header = basic_auth_header(LOGIN_PREFIX+user_uuid,
					tuns.AgentKey)
				(&mux).Unlock()
				logger.Info("Credentials rotated successfully.")
			}
		}
	}()
	return
}