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// URLs implements a breadth-first search webcrawler based on the
// example given in section 8.6 of The Go Programming Language.
package main
import (
"flag"
"fmt"
"log"
"net/url"
"runtime/pprof"
"strings"
"time"
)
func main() {
maxConcurrency := flag.Int("c", 0, "Maximum number of concurrent queue pushes")
startRawURL := flag.String("url", "", "Entry-point URL")
maxURLs := flag.Int("max", 0, "Maximum number of URLs to collect (omitted or 0 means no limit)")
flag.Parse()
if *maxConcurrency == 0 {
log.Fatal("Missing -c argument")
}
if *maxConcurrency < 1 {
log.Fatalf("Invalid -c argument: %d", *maxConcurrency)
}
if *startRawURL == "" {
log.Fatal("Missing -url argument")
}
if *maxURLs < 0 {
log.Fatalf("Invalid -max argument: %d", *maxURLs)
}
startURL, err := url.Parse(*startRawURL)
if err != nil {
log.Fatal(err)
}
getLeakProfile(func() {
classic(*startURL, *maxConcurrency, *maxURLs, 1)
})
}
// getLeakProfile runs a leaky program snippet, extracts the goroutine leak profile,
// and writes it to stdout.
func getLeakProfile(leakySnippet func()) {
prof := pprof.Lookup("goroutineleak")
defer func() {
time.Sleep(2 * time.Second)
var content strings.Builder
prof.WriteTo(&content, 2)
// Ignore non leaked goroutines
leaks := strings.SplitSeq(content.String(), "\n\n")
for leak := range leaks {
if strings.Contains(leak, "(leaked)") {
fmt.Println(leak + "\n")
}
}
}()
leakySnippet()
}
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