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Copy pathcrawler.go
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249 lines (207 loc) · 5.01 KB
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package main
import (
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/PuerkitoBio/goquery"
)
const (
CNES_BASE_URL = "http://cnes.datasus.gov.br/"
WORKERS = 10
)
type NewState struct {
Name string
Url string
}
type NewCity struct {
Name string
Url string
IBGE string
}
var StateQueue chan NewState
var CityQueue chan NewCity
var CACHE_FOLDER = os.Getenv("CACHE_FOLDER")
func main() {
StateQueue = make(chan NewState)
CityQueue = make(chan NewCity)
StartRequestService(WORKERS)
Collector()
}
func Collector() {
doc, err := request(CNES_BASE_URL + "Lista_Tot_Es_Estado.asp")
if err != nil {
log.Println("Err", err, "Sleeping...")
time.Sleep(2 * time.Second)
Collector()
return
}
var wg sync.WaitGroup
for i := 0; i < WORKERS; i++ {
wg.Add(1)
go func() {
Workers()
wg.Done()
}()
}
getStates(doc)
wg.Wait()
}
func Workers() {
for {
select {
case state := <-StateQueue:
doc, err := request(state.Url)
if err != nil {
log.Println("ERROR", err)
time.Sleep(5 * time.Second)
StateQueue <- state
} else {
getCities(doc)
log.Println("TODO:", "Saving state url on DB", state)
}
case city := <-CityQueue:
doc, err := request(city.Url)
if err != nil {
log.Println("ERROR", err)
time.Sleep(5 * time.Second)
CityQueue <- city
} else {
getEntities(doc)
log.Println("TODO:", "Saving city url on DB", city)
}
}
}
}
func getStates(doc goquery.Document) {
doc.Find("div[style = 'width:300; height:209; POSITION: absolute; TOP: 185px; LEFT: 400px; overflow:auto'] table tr").Each(func(_ int, s *goquery.Selection) {
data := s.Find("td")
name := strings.TrimSpace(data.Eq(0).Text())
urlState, _ := data.Eq(0).Find("a").Attr("href")
StateQueue <- NewState{Name: name, Url: CNES_BASE_URL + urlState}
})
}
func getCities(doc goquery.Document) {
doc.Find("div[style = 'width:450; height:300; POSITION: absolute; TOP: 201px; LEFT: 180px; overflow:auto'] table tr").Each(func(_ int, s *goquery.Selection) {
go func(data *goquery.Selection) {
ibge := data.Eq(0).Text()
name := data.Eq(1).Text()
urlCity, _ := data.Eq(1).Find("a").Attr("href")
CityQueue <- NewCity{Name: strings.TrimSpace(name), Url: CNES_BASE_URL + urlCity, IBGE: ibge}
}(s.Find("td"))
})
}
func getEntities(doc goquery.Document) {
doc.Find("div[style='width:539; height:500; POSITION: absolute; TOP:198px; LEFT: 121px; overflow:auto'] table a").Each(func(_ int, s *goquery.Selection) {
urlEntity, ok := s.Attr("href")
if ok {
request(CNES_BASE_URL + urlEntity)
}
})
}
/// Requests
type NewRequest struct {
Url string
C chan Response
}
type Response struct {
Doc goquery.Document
Err error
}
var (
RequestQueue = make(chan NewRequest)
)
func StartRequestService(n int) {
client := http.Client{}
for i := 0; i < n; i++ {
go processRequestQueue(i, client)
}
}
func processRequestQueue(i int, client http.Client) {
workerID := strconv.Itoa(i)
log.Println("#"+workerID, "REQUEST WORKER STARTED")
for {
var (
doc goquery.Document
doc_ *goquery.Document
err error
)
r := <-RequestQueue
log.Println("#"+workerID, "GET", r.Url)
filename := urlToFilename(r.Url)
log.Println("trying", filename)
if _, err = os.Stat(filename); err == nil {
file, err := os.Open(filename)
if err == nil {
log.Println("#"+workerID, "FROM CACHE", r.Url)
doc_, err = goquery.NewDocumentFromReader(file)
doc = *doc_
}
} else {
doc, err = makeRequest(r.Url, client)
}
log.Println("#"+workerID, "DONE", r.Url)
r.C <- Response{
Doc: doc,
Err: err,
}
<-time.After(4 * time.Second)
}
}
func makeRequest(urlS string, client http.Client) (doc goquery.Document, err error) {
var (
req *http.Request
res *http.Response
doc_ *goquery.Document
)
urlP, err := url.Parse(urlS)
if err != nil {
log.Fatal(err)
}
q := urlP.Query()
urlP.RawQuery = q.Encode()
req, err = http.NewRequest("GET", urlP.String(), nil)
if err != nil {
log.Println("ERROR", err)
} else {
req.Header.Set("User-Agent", "Mozilla/5.0 (DataBr.io Crawler) AppleWebKit/537.13+ (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2")
res, err = client.Do(req)
if err != nil {
log.Println("ERROR", err)
} else {
data, _ := ioutil.ReadAll(res.Body)
ioutil.WriteFile(urlToFilename(urlS), data, os.ModePerm)
doc_, err = goquery.NewDocumentFromReader(res.Body)
doc = *doc_
res.Body.Close()
}
}
return doc, err
}
var urlToFileRegex = regexp.MustCompile(`\W`)
func urlToFilename(u string) string {
return CACHE_FOLDER + "/" + urlToFileRegex.ReplaceAllString(u, "-")
}
var Errors = make(map[string]int64, 0)
func request(u string) (goquery.Document, error) {
c := make(chan Response)
RequestQueue <- NewRequest{Url: u, C: c}
r := <-c
if r.Err != nil {
if Errors[u] > 3 {
return goquery.Document{}, r.Err
}
Errors[u] = Errors[u] + 1
log.Println("ERR", r.Err, ", counter:", Errors[u])
time.Sleep(2 * time.Second)
return request(u)
} else {
return r.Doc, r.Err
}
}