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reader.go
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/
reader.go
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package main
import (
"net"
"sync"
goTLD "github.com/jpillora/go-tld"
)
// concurrencyLimit limits the maximum number of concurrent reading process tasks
const concurrencyLimit = 50
// Row represents a row
type Row struct {
Subdomain string
Domain string
TLD string
IPRecords []net.IP
}
// Process processes all rows
// code is from https://github.com/google/gops/blob/5d514cabbb21de80cb27f529555ee090b60bbb80/goprocess/gp.go#L29
func Process() []Row {
domains := Domains()
input := make(chan string, len(domains))
output := make(chan Row, len(domains))
for _, domain := range domains {
input <- domain
}
close(input)
var wg sync.WaitGroup
wg.Add(concurrencyLimit)
// Run concurrencyLimit of workers until there
// is no more processes to be checked in the input channel.
for i := 0; i < concurrencyLimit; i++ {
go func() {
defer wg.Done()
for row := range input {
subdomain, domain, tld, IPRecords, ok := processDomain(row)
if !ok {
continue
}
output <- Row{
Subdomain: subdomain,
Domain: domain,
TLD: tld,
IPRecords: IPRecords,
}
}
}()
}
wg.Wait() // wait until all workers are finished
close(output) // no more results to be waited for
var results []Row
for p := range output {
results = append(results, p)
}
return results
}
// processDomain processes a row
func processDomain(row string) (subdomain, domain, tld string, IPRecords []net.IP, ok bool) {
u, err := goTLD.Parse("http://" + row)
if err != nil {
ok = false
return
}
var records []net.IP
ipRecords, err := net.LookupIP(row)
if err == nil {
for _, ip := range ipRecords {
records = append(records, ip)
}
}
return u.Subdomain, u.Domain, u.TLD, records, true
}