func (c *Crawler) Start() Enqueuer {
if c.Logger == nil {
c.Logger = newLogger(c.LogFormat, c.LogLevel)
}
c.mux.HandleErrors(c.newErrorHandler())
h := c.newRequestHandler()
f := fetchbot.New(h)
f.CrawlDelay = c.CrawlDelay
f.DisablePoliteness = !c.CrawlPoliteness
f.HttpClient = c.HTTPClient
f.UserAgent = c.UserAgent
c.f = f
c.q = c.f.Start()
if c.CrawlDuration > 0 {
go func() {
t := time.After(c.CrawlDuration)
<-t
c.q.Close()
}()
}
return &Queue{c.q}
}
func main() {
f := fetchbot.New(fetchbot.HandlerFunc(handler))
f.AutoClose = true
f.WorkerIdleTTL = time.Second
queue := f.Start()
queue.SendStringHead("http://google.com", "http://golang.org", "http://golang.org/doc")
queue.Block()
}
func main() {
var sql_Cmd string
runtime.GOMAXPROCS(runtime.NumCPU())
flag.Parse()
mux := fetchbot.NewMux()
fmt.Printf("Register a ErrorHandler\n")
mux.HandleErrors(fetchbot.HandlerFunc(err_Handler))
// 1. Handle GET requests for html responses
// 2. to parse the body and
// 3. enqueue all links as HEAD requests.
fmt.Printf("Register a GetHandler\n")
mux.Response().Method("GET").ContentType("text/html").Handler(fetchbot.HandlerFunc(get_Handler))
// 1. Handle HEAD requests for html responses coming from the source host.
// 2. We don't want to crawl links from other hosts.
fmt.Printf("Register a HeadHandler\n")
mux.Response().Method("HEAD").Host("golang.org").ContentType("text/html").Handler(fetchbot.HandlerFunc(head_Handler))
// Create the Fetcher, handle the logging first, then dispatch to the Muxer
fmt.Printf("Register a LogHandler\n")
h := logHandler(mux)
fmt.Printf("New a fetchbot\n")
f := fetchbot.New(h)
/* Start processing */
fmt.Printf("Start the fetchbot\n")
q := f.Start()
// Enqueue the seed, which is the first entry in the dup map
fmt.Printf("Enqueue the seed\n")
db = setupDB()
sql_Cmd = sql_Cmd_Select(consumer)
rows, err_DB := db.Query(sql_Cmd)
if err_DB != nil {
fmt.Printf("[ERR]DB select fail\n")
panicIF(err_DB)
}
for rows.Next() {
rows.Scan(&seed_URL)
dup_URLs[seed_URL] = true
_, err := q.SendStringGet(seed_URL)
if err != nil {
fmt.Printf("[ERR] GET %s - %s\n", seed_URL, err)
}
}
fmt.Printf("Start fetch Process\n")
q.Block()
fmt.Printf("End the process\n")
}
func main() {
var url string
f := fetchbot.New(fetchbot.HandlerFunc(handler))
f.DisablePoliteness = true
db1 = dbutils.NewDB1()
defer db1.Close()
db2 = dbutils.NewDB2()
defer db2.Close()
rows, _ := db1.Query("select url FROM urls")
defer rows.Close()
for rows.Next() {
rows.Scan(&url)
queue := f.Start()
queue.SendStringGet(url)
queue.Close()
}
}
// ProcessMessage initializes a crawler to parse a specific url and crawls its html looking for images.
func ProcessMessage(q queue.Connection, d db.Connection, msg *queue.Message) {
log.Printf("type=messageReceived msg=%v\n", msg)
view, err := d.ViewPage(msg.JobUUID, msg.URL)
if err != nil {
log.Printf("type=viewPageError jobUUID=%s url=%s err=%v\n", msg.JobUUID, msg.URL, err)
return
}
if !view {
log.Printf("type=pageAlreadyViewed jobUUID=%s url=%s\n", msg.JobUUID, msg.URL)
return
}
c := newCrawler(d, q, msg)
c.fetcher = fetchbot.New(fetchbot.HandlerFunc(c.crawlResponse))
c.fetcher.HttpClient = httpClient
c.Crawl()
}
func main() {
flag.Parse()
// Create the muxer
mux := fetchbot.NewMux()
// Handle all errors the same
mux.HandleErrors(fetchbot.HandlerFunc(func(ctx *fetchbot.Context, res *http.Response, err error) {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
}))
// Handle GET requests for html responses, to parse the body and enqueue all links as HEAD
// requests.
mux.Response().Method("GET").ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
// Process the body to find the links
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
return
}
// Enqueue all links as HEAD requests
enqueueLinks(ctx, doc)
}))
// Handle HEAD requests for html responses coming from the source host - we don't want
// to crawl links from other hosts.
mux.Response().Method("HEAD").Host("golang.org").ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
if _, err := ctx.Q.SendStringGet(ctx.Cmd.URL().String()); err != nil {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
}
}))
// Create the Fetcher, handle the logging first, then dispatch to the Muxer
h := logHandler(mux)
if *stopAtUrl != "" {
h = stopHandler(*stopAtUrl, logHandler(mux))
}
f := fetchbot.New(h)
// First mem stat print must be right after creating the fetchbot
if *memStats > 0 {
// Print starting stats
printMemStats(nil)
// Run at regular intervals
runMemStats(f, *memStats)
// On exit, print ending stats after a GC
defer func() {
runtime.GC()
printMemStats(nil)
}()
}
// Start processing
q := f.Start()
if *stopAfter > 0 {
go func() {
c := time.After(*stopAfter)
<-c
q.Close()
}()
}
// Enqueue the seed, which is the first entry in the dup map
_, err := q.SendStringGet(seed)
if err != nil {
fmt.Printf("[ERR] GET %s - %s\n", seed, err)
}
q.Block()
}
func main() {
f := fetchbot.New(fetchbot.HandlerFunc(handler))
queue := f.Start()
queue.SendStringHead("http://google.com", "http://golang.org", "http://golang.org/doc")
queue.Close()
}
func main() {
flag.Parse()
// Parse the provided seed
u, err := url.Parse(*seed)
if err != nil {
log.Fatal(err)
}
// Create the muxer
mux := fetchbot.NewMux()
// Handle all errors the same
mux.HandleErrors(fetchbot.HandlerFunc(func(ctx *fetchbot.Context, res *http.Response, err error) {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
}))
// Handle GET requests for html responses, to parse the body and enqueue all links as HEAD
// requests.
mux.Response().Method("GET").ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
// Process the body to find the links
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
return
}
// Enqueue all links as HEAD requests
enqueueLinks(ctx, doc)
}))
// Handle HEAD requests for html responses coming from the source host - we don't want
// to crawl links from other hosts.
mux.Response().Method("HEAD").Host(u.Host).ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
if _, err := ctx.Q.SendStringGet(ctx.Cmd.URL().String()); err != nil {
fmt.Printf("[ERR] %s %s - %s\n", ctx.Cmd.Method(), ctx.Cmd.URL(), err)
}
}))
// Create the Fetcher, handle the logging first, then dispatch to the Muxer
h := logHandler(mux)
if *stopAtURL != "" || *cancelAtURL != "" {
stopURL := *stopAtURL
if *cancelAtURL != "" {
stopURL = *cancelAtURL
}
h = stopHandler(stopURL, *cancelAtURL != "", logHandler(mux))
}
f := fetchbot.New(h)
// First mem stat print must be right after creating the fetchbot
if *memStats > 0 {
// Print starting stats
printMemStats(nil)
// Run at regular intervals
runMemStats(f, *memStats)
// On exit, print ending stats after a GC
defer func() {
runtime.GC()
printMemStats(nil)
}()
}
// Start processing
q := f.Start()
// if a stop or cancel is requested after some duration, launch the goroutine
// that will stop or cancel.
if *stopAfter > 0 || *cancelAfter > 0 {
after := *stopAfter
stopFunc := q.Close
if *cancelAfter != 0 {
after = *cancelAfter
stopFunc = q.Cancel
}
go func() {
c := time.After(after)
<-c
stopFunc()
}()
}
// Enqueue the seed, which is the first entry in the dup map
dup[*seed] = true
_, err = q.SendStringGet(*seed)
if err != nil {
fmt.Printf("[ERR] GET %s - %s\n", *seed, err)
}
q.Block()
}
func main() {
lf, err := os.OpenFile("testlogfile", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
log.Fatalf("error opening file: %v", err)
}
defer lf.Close()
log.SetOutput(lf)
log.Println("This is a test log entry")
seed := "http://github.com/golang/go/wiki"
u, err := url.Parse(seed)
fmt.Printf("Scanning: %v\n", u.String())
if err != nil {
log.Fatal(err)
}
mux := fetchbot.NewMux()
// Handle all errors the same
mux.HandleErrors(fetchbot.HandlerFunc(func(ctx *fetchbot.Context, res *http.Response, err error) {
fmt.Printf("[ERR - HandleErrors] %s\n", err)
}))
// Handle GET requests for html responses, to parse the body and enqueue all links as HEAD
// requests.
mux.Response().Method("GET").Host(u.Host).Path("/golang/go/wiki").ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
log.Printf("GET: %v - %v\n", res.Status, ctx.Cmd.URL())
doc, err := goquery.NewDocumentFromResponse(res)
if err != nil {
fmt.Printf("[GET] %s %s - %s\n", res.Status, ctx.Cmd.URL(), err)
return
}
// Enqueue all links as HEAD requests
enqueueLinks(ctx, doc)
}))
// Handle GET requests for html responses coming from the source host - we don't want
// to crawl links from other hosts.
mux.Response().ContentType("text/html").Handler(fetchbot.HandlerFunc(
func(ctx *fetchbot.Context, res *http.Response, err error) {
log.Printf("HEAD: %v - %v\n", res.Status, ctx.Cmd.URL())
if strings.HasPrefix(res.Status, "40") || strings.HasPrefix(res.Status, "50") {
fmt.Printf("[ERR] - %v - %v\n", res.Status, ctx.Cmd.URL())
}
}))
h := logHandler(mux)
f := fetchbot.New(h)
f.UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36"
f.DisablePoliteness = true
queue := f.Start()
queue.SendStringHead()
dup[seed] = true
_, err = queue.SendStringGet(seed)
if err != nil {
fmt.Printf("[ERR] GET %s - %s\n", seed, err)
}
queue.Block()
}