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main.go
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main.go
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package main
import (
"flag"
"log"
"strings"
"sync"
"time"
"github.com/aladh/domain_name_checker/domain"
"github.com/aladh/domain_name_checker/rdap"
)
func init() {
flag.Parse()
}
func main() {
domains := *new([]*domain.Domain)
for _, name := range strings.Split(flag.Arg(0), ",") {
domains = append(domains, domain.New(name))
}
err := rdap.Initialize()
if err != nil {
log.Fatalf("error initialzing rdap: %s", err)
}
tldsChan := make(chan *tld)
go partitionBy(domains, tldsChan, func(domain domain.Domain) string {
return domain.Tld
})
availableChan := checkAvailability(tldsChan)
for d := range availableChan {
log.Println(d.Name)
}
}
func checkAvailability(tldsChan chan *tld) chan *domain.Domain {
availableChan := make(chan *domain.Domain)
go checkAvailabilityAsync(tldsChan, availableChan)
return availableChan
}
func checkAvailabilityAsync(tldsChan chan *tld, availableChan chan *domain.Domain) {
wg := sync.WaitGroup{}
for t := range tldsChan {
wg.Add(1)
go func(t *tld) {
defer wg.Done()
checkAvailabilityForTld(t, availableChan)
}(t)
}
wg.Wait()
close(availableChan)
}
func checkAvailabilityForTld(t *tld, availableChan chan *domain.Domain) {
log.Printf("starting worker for tld: %s\n", t.Name)
for d := range t.Domains {
log.Printf("processing domain: %s\n", d.Name)
expiryDate, err := rdap.ExpiryDate(d)
if err != nil {
log.Printf("error checking expiry date for domain %s: %s\n", d.Name, err)
continue
}
log.Printf("domain %s expires on %s\n", d.Name, expiryDate)
time.Sleep(200 * time.Millisecond)
}
}
type tld struct {
Name string
Domains chan *domain.Domain
}
func NewTld(name string) *tld {
const tldBuffer = 100
return &tld{
Name: name,
Domains: make(chan *domain.Domain, tldBuffer),
}
}
func partitionBy(domainsChan []*domain.Domain, tldsChan chan *tld, partitionKey func(domain.Domain) string) {
tldMap := make(map[string]*tld)
for _, d := range domainsChan {
tldName := partitionKey(*d)
if tldForDomain, ok := tldMap[tldName]; ok {
tldForDomain.Domains <- d
} else {
tldForDomain = NewTld(tldName)
tldMap[tldName] = tldForDomain
tldsChan <- tldForDomain
tldForDomain.Domains <- d
}
}
for _, v := range tldMap {
close(v.Domains)
}
close(tldsChan)
}