func (self *Spider) RunPusher() error {
log.Printf("Spider.RunPusher()\n")
for {
// попробуем достать урлы, которые надо обойти
urls := self.urls.DequeueN(self.pushCnt)
if urls == nil {
time.Sleep(self.interval)
continue
}
log.Printf("Spider.RunPusher(): push urls %#v\n", urls)
// скажем менеджеру загрузки их обойти
if err := self.cg.PushUrls(urls); err != nil {
return err
}
// положим их в список ожидающих
self.waitMutex.Lock()
for _, url := range urls {
self.waitUrls[url] = struct{}{}
}
self.waitMutex.Unlock()
log.Printf("Spider.RunPusher(): pushed urls %#v\n", urls)
}
}
func (self *Caregiver) PushUrls(urls []string) error {
log.Printf("Caregiver.PushUrls(%#v)\n", urls)
data := map[string][]string{}
for _, u := range urls {
url, err := url.Parse(u)
if err != nil {
return errors.NewErr(err)
}
path := url.Path
if len(path) != 0 && path[0] == '/' {
path = path[1:]
}
if url.RawQuery != "" {
path += "?"
path += url.RawQuery
}
data[url.Host] = append(data[url.Host], path)
}
for host, urls := range data {
self.mutex.Lock()
hosts, ok := self.hosts[host]
if !ok {
hosts = self.getData(host)
self.hosts[host] = hosts
}
self.mutex.Unlock()
hosts.urls.EnqueueAll(urls...)
}
log.Printf("Caregiver.PushUrls(%#v) OK\n", urls)
return nil
}
func (self *Gatekeeper) Write(url, key string, data []byte) (Value, error) {
log.Printf("Gatekeeper.Write(%v, %v)\n", url, key)
if self.file.file == nil {
f, err := os.Create(self.dir + "/" + strconv.Itoa(int(self.fNum)))
if err != nil {
return Value{}, errors.NewErr(err)
}
self.file = gkFile{
file: f,
offset: 0,
end: time.Now().Add(self.maxTime),
}
} else if self.file.offset >= self.maxFileSize {
if err := self.nextFile(); err != nil {
return Value{}, err
}
} else if self.file.end.Before(time.Now()) {
if err := self.file.file.Sync(); err != nil {
return Value{}, errors.NewErr(err)
}
self.file.end = time.Now().Add(self.maxTime)
}
offset := self.file.offset
cnt := 0
n, err := self.file.WriteLenval([]byte(url))
if err != nil {
return Value{}, err
}
cnt += n
n, err = self.file.WriteLenval(data)
if err != nil {
return Value{}, err
}
cnt += n
self.file.offset += uint64(cnt)
res := Value{
FNum: self.fNum,
Offset: offset,
Len: uint64(cnt),
}
self.trie.Add([]byte(key), res)
// TODO: remove
self.file.file.Sync()
log.Printf("Gatekeeper.Write(%v, %v) OK (%+v)\n", url, key, res)
return res, nil
}
func (self *Gatekeeper) Find(key string) (Value, bool) {
log.Printf("Gatekeeper.Find(%+v)\n", key)
res, ok := self.trie.Find([]byte(key))
log.Printf("Gatekeeper.Find(%+v) OK (%v, %v)\n", key, res, ok)
if !ok {
return Value{}, false
}
return res.(Value), true
}
// TODO: тут эта штука должна распределять урлы по шардам и по сети раздавать
func (self *Spider) AddUrls(urls []string) {
log.Printf("Spider.AddUrls(%#v)\n", urls)
self.urls.EnqueueAll(urls...)
// положим их в список ожидающих
self.waitMutex.Lock()
for _, url := range urls {
self.waitUrls[url] = struct{}{}
}
self.waitMutex.Unlock()
log.Printf("Spider.AddUrls(%#v) OK\n", urls)
}
func (self *Resolver) ResolveAll(hosts []string) ([][]string, error) {
log.Printf("Resolver.ResolveAll(%#v)\n", hosts)
res := make([][]string, len(hosts))
for i, host := range hosts {
b, err := self.Resolve(host)
if err != nil {
return nil, err
}
res[i] = b
}
log.Printf("Resolver.ResolveAll(%#v) OK\n", hosts)
return res, nil
}
func (self *Downloader) DownloadAll(urls []string) ([]string, error) {
log.Printf("Downloader.DownloadAll(%#v)!\n", urls)
res := make([]string, len(urls))
for i, url := range urls {
b, err := self.Download(url)
if err != nil {
return nil, err
}
res[i] = b
}
log.Printf("Downloader.DownloadAll(%#v) OK!\n", urls)
return res, nil
}
func main() {
var help = flag.Bool("help", false, "print help")
var addr = flag.String("addr", "", "address to dial")
var method = flag.String("method", "", "rpc method")
var parg = flag.String("arg", "", "method argument")
flag.Parse()
if *help || *addr == "" || *method == "" || *parg == "" {
flag.PrintDefaults()
return
}
client, err := util.JsonRpcDial(*addr)
if err != nil {
log.Fatal(err)
}
var arg interface{}
if err := json.Unmarshal([]byte(*parg), &arg); err != nil {
log.Fatal(errors.NewErr(err))
}
var res interface{}
if err := client.Call(*method, arg, &res); err != nil {
log.Fatal(errors.NewErr(err))
}
log.Printf("%+v\n", res)
}
func (self *Downloader) Download(url string) (string, error) {
log.Printf("Downloader.Download(%s)\n", url)
resp, err := http.Get(url)
if err != nil {
return "", errors.NewErr(err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", errors.NewErr(err)
}
log.Printf("Downloader.Download(%s) OK!\n", url)
return string(body), nil
}
func (self *Resolver) Resolve(host string) ([]string, error) {
log.Printf("Resolver.Resolve(%s)\n", host)
self.mutex.RLock()
r, hacheHit := self.cache[host]
self.mutex.RUnlock()
var res []string
if hacheHit && time.Now().Before(r.end) {
self.load(&r, &res)
log.Printf("Resolver.Resolve(%s) OK (cache)!\n", host)
return res, nil
}
val, err := net.LookupIP(host)
if err != nil {
err = errors.NewErr(err)
if hacheHit {
self.load(&r, &res)
log.Errorln(err)
log.Printf("Resolver.Resolve(%s) OK (cache, but error)!\n", host)
return res, nil
}
return nil, err
}
d := dataT{
ips: make([]net.IP, 0, len(val)),
end: time.Now().Add(self.cacheTime),
}
for _, v := range val {
// if ip4 := v.To4(); len(ip4) == net.IPv4len {
d.ips = append(d.ips, v)
// }
}
self.mutex.Lock()
self.cache[host] = d
self.mutex.Unlock()
self.load(&d, &res)
log.Printf("Resolver.Resolve(%s) OK!\n", host)
return res, nil
}
func (self *Caregiver) PullUrls() map[string]string {
log.Printf("Caregiver.PullUrls()\n")
for {
self.dataMutex.RLock()
sleep := len(self.data) == 0
self.dataMutex.RUnlock()
if !sleep {
break
}
time.Sleep(self.pullTimeout)
}
self.dataMutex.Lock()
defer self.dataMutex.Unlock()
res := self.data
self.data = map[string]string{}
log.Printf("Caregiver.PullUrls() OK (%v)\n", len(res))
return res
}
func (self *Gatekeeper) Read(val Value) (string, error) {
log.Printf("Gatekeeper.Read(%+v)\n", val)
f, err := util.Open(self.dir + "/" + strconv.Itoa(int(val.FNum)))
if err != nil {
return "", err
}
if _, err := f.Seek(int64(val.Offset), 0); err != nil {
return "", err
}
if _, err := f.SkipLenval(); err != nil {
return "", err
}
_, res, err := f.ReadLenval()
if err != nil {
return "", err
}
log.Printf("Gatekeeper.Read(%+v) OK\n", val)
return string(res), nil
}
func (self *Gatekeeper) load(name string, num uint, counts map[uint]uint) error {
log.Printf("Gatekeeper.load(%v, %v)\n", name, num)
file, err := util.Open(name)
if err != nil {
return err
}
cnt := uint64(0)
for {
n1, key, err := file.ReadLenval()
if err == io.EOF {
break
}
if err != nil {
return err
}
u, err := UrlTransform(string(key))
if err != nil {
return err
}
n2, err := file.SkipLenval()
if err != nil {
return err
}
nv := Value{
FNum: num,
Offset: cnt,
Len: n1 + n2,
}
old := self.trie.Add([]byte(u), nv)
if old != nil {
old := old.(Value)
if old.Len != 0 {
counts[old.FNum] -= 1
}
}
cnt += n1 + n2
counts[num] += 1
}
return nil
}
func (self *Spider) RunPuller() error {
log.Printf("Spider.RunPuller()\n")
for {
now := time.Now()
// получим документы
urls, err := self.cg.PullUrls()
if err != nil {
return err
}
log.Printf("Spider.RunPuller(): pulled urls\n")
// запишем их в хранилище
toDel := []string{}
for url, v := range urls {
_, err := self.gk.Write(url, v)
if err != nil {
toDel = append(toDel, url)
}
}
if len(toDel) != 0 {
// те, что не получилось, попросим перекачать потом
log.Printf("Spider.RunPuller(): reenqueue urls %#v\n", toDel)
self.urls.EnqueueAll(toDel...)
for _, url := range toDel {
delete(urls, url)
}
}
// те, что получилось удалим из ожидания
self.waitMutex.Lock()
for url, _ := range urls {
delete(self.waitUrls, url)
}
self.waitMutex.Unlock()
// и отметим, что выкачали
for url, _ := range urls {
self.doneUrls[url] = struct{}{}
}
log.Printf("Spider.RunPuller(): find urls\n")
// теперь распарсим документы на предмет урлов и добавим их в список желаемых
newUrls := make([]string, 0, 100 /*TODO: ajust multiplier at runtime?*/ *len(urls))
for k, v := range urls {
curr, err := url.Parse(k)
if err != nil {
return err
}
matches := urlRegex.FindAllStringSubmatch(v, -1)
for _, v := range matches {
u := v[1]
if parsed, err := url.Parse(u); err == nil {
parsed.Fragment = ""
if parsed.Scheme == "" {
parsed.Scheme = curr.Scheme
}
if parsed.Host == "" {
parsed.Host = curr.Host
}
newUrls = append(newUrls, parsed.String())
}
}
}
// проверим, есть ли такие урлы в ожидании, если есть, отменим их
self.waitMutex.Lock()
for i := 0; i < len(newUrls); i += 1 {
if _, ok := self.waitUrls[newUrls[i]]; ok {
newUrls[i] = ""
}
}
self.waitMutex.Unlock()
// проверим, есть ли такие урлы в скачанных, если есть, отменим их
for i := 0; i < len(newUrls); i += 1 {
if newUrls[i] == "" {
continue
}
if _, ok := self.doneUrls[newUrls[i]]; ok {
newUrls[i] = ""
}
}
// TODO: тут еще по robots.txt для хоста вычистить урлы
// проверим, есть ли такие урлы в хранилище, если есть, отменим их
for i := 0; i < len(newUrls); i += 1 {
if newUrls[i] == "" {
continue
}
_, ok, err := self.gk.Find(newUrls[i])
if err != nil {
return err
}
if ok {
newUrls[i] = ""
}
}
tmp := map[string]struct{}{}
for _, url := range newUrls {
if url != "" {
tmp[url] = struct{}{}
}
}
// положим оставшиеся в очередь
toQ := make([]string, 0, len(tmp))
for url, _ := range tmp {
toQ = append(toQ, url)
}
if len(toQ) != 0 {
self.AddUrls(toQ)
}
passed := time.Now().Sub(now)
if self.interval > passed {
time.Sleep(self.interval - passed)
}
}
}
func (self *Caregiver) Start() error {
log.Printf("Caregiver.Start()\n")
for {
// выделим хосты, которын можно по таймауту качать
data := map[string]*hostData{}
self.mutex.Lock()
now := time.Now()
for k, v := range self.hosts {
if v.urls.Len() != 0 && v.end.Before(now) {
data[k] = v
}
}
self.mutex.Unlock()
if len(data) == 0 {
time.Sleep(self.WorkTimeout)
continue
}
log.Printf("Caregiver.Start(): start downloading\n")
// резолвим dns
hosts := make([]string, 0, len(data))
for k, _ := range data {
hosts = append(hosts, k)
}
var err error
ips := map[string][]string{}
// if self.dns != nil {
// ips, err = self.dns.ResolveAll(hosts)
// if err != nil {
// return err
// }
// }
now = time.Now()
// можно качать!
urls := []string{}
for k, v := range data {
/*
TODO: запросы по ip почему-то не работаютю.
Подозреваю, что сервер читает RequestURL и нужно будет реализовать свой стек http, чтобы все заработало.
*/
ip := k
if v, ok := ips[k]; ok && len(v) != 0 {
ip = v[0]
if strings.Contains(ip, ":") {
ip = "[" + ip + "]:80"
}
}
host := "http://" + ip
us := v.urls.DequeueN(v.maxCount)
for i := 0; i < len(us); i += 1 {
if len(us[i]) != 0 {
us[i] = host + "/" + us[i]
} else {
us[i] = host
}
}
urls = append(urls, us...)
}
log.Printf("Caregiver.Start(): collected urls %#v\n", urls)
docs, err := self.downloader.DownloadAll(urls)
if err != nil {
log.Errorln(err)
}
now = time.Now()
for _, v := range data {
v.end = now.Add(v.timeout)
}
for i, v := range docs {
if v != "" {
self.dataMutex.Lock()
self.data[urls[i]] = v
self.dataMutex.Unlock()
} else {
log.Errorln("Couldn't download url "+urls[i]+",", v)
}
}
log.Printf("Caregiver.Start(): downloaded urls %#v\n", urls)
}
}
