checker.go

package main

import (
	"fmt"
	"sync"
)

type checkFn func(username string) bool

type SingleCheck struct {
	URL     string
	checkFn checkFn
}

func (s *SingleCheck) Check(username string, wg *sync.WaitGroup, results chan<- Result) {
	defer wg.Done()
	res := Result{
		URL:      s.URL,
		Function: s.checkFn,
		Found:    false,
	}
	if s.checkFn(username) {
		res.Found = true
	}
	results <- res
}

type Result struct {
	URL      string
	Found    bool
	Function checkFn
}

type Checker struct {
	Username string
	Results  chan Result
	Checks   []SingleCheck
}

func (c *Checker) Run() {
	done := make(chan struct{})

	go func() {
		for res := range c.Results {
			fmt.Println(res)
		}
		done <- struct{}{}
	}()

	var wg sync.WaitGroup
	wg.Add(len(c.Checks))
	for _, check := range c.Checks {
		check.Check(c.Username, &wg, c.Results)
	}
	wg.Wait()
	close(c.Results)
	<-done
}

func main() {
	checker := &Checker{
		Username: "Erhad",
		Results:  make(chan Result, 50),
		Checks: []SingleCheck{
			SingleCheck{
				URL:     "https://www.google.com",
				checkFn: checkStatusCode,
			},
			SingleCheck{
				URL:     "https://www.facebook.com",
				checkFn: checkRegex,
			},
			SingleCheck{
				URL:     "https://www.klix.ba",
				checkFn: checkStatusCode,
			},
		},
	}

	checker.Run()
}

func checkStatusCode(username string) bool {
	return true
}

func checkRegex(username string) bool {
	return true
}