alex/restaurant-search
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Cache scraping

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This commit is contained in:
Alex Yatskov 2015-08-13 16:29:39 +09:00
parent 6b8e33b4d2
commit 27bf94505c
4 changed files with 131 additions and 47 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
search-scrape
web_cache

9
scrape.go
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@ -22,13 +22,6 @@
package main
import "log"
func main() {
urlFormat := "http://tabelog.com/en/kanagawa/rstLst/{{.Page}}/"
tabelogReviews := "tabelog.json"
if err := scrapeTabelog(tabelogReviews, urlFormat); err != nil {
log.Fatal(err)
}
scrapeTabelog("http://tabelog.com/en/kanagawa/rstLst/1/", "tabelog.json", "web_cache")
}

89
tabelog.go
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@ -23,14 +23,13 @@
package main
import (
"bytes"
"encoding/json"
"io/ioutil"
"log"
"net/url"
"strconv"
"strings"
"sync"
"text/template"
"github.com/PuerkitoBio/goquery"
)
@ -50,15 +49,31 @@ type tabelogReview struct {
Cost float64
Drinks float64
Url string
Raw string
}
func dumpReviews(filename string, in chan tabelogReview, out chan error) {
count := 1
func makeAbsUrl(base, ref string) string {
b, err := url.Parse(base)
if err != nil {
log.Fatal(err)
}
r, err := url.Parse(ref)
if err != nil {
log.Fatal(err)
}
return b.ResolveReference(r).String()
}
func dumpReviews(filename string, rc chan tabelogReview, cond *sync.Cond) {
defer cond.Signal()
count := 1
var reviews []tabelogReview
for {
if review, ok := <-in; ok {
log.Printf("%d\t%s", count, review.Name)
if review, ok := <-rc; ok {
log.Printf("%s (%d)", review.Name, count)
reviews = append(reviews, review)
count++
} else {
@ -68,19 +83,20 @@ func dumpReviews(filename string, in chan tabelogReview, out chan error) {
js, err := json.MarshalIndent(reviews, "", " ")
if err != nil {
out <- err
return
log.Fatal(err)
}
out <- ioutil.WriteFile(filename, js, 0644)
if err := ioutil.WriteFile(filename, js, 0644); err != nil {
log.Fatal(err)
}
}
func scrapeReview(url string, out chan tabelogReview, wg *sync.WaitGroup) {
func scrapeReview(url string, rc chan tabelogReview, wg *sync.WaitGroup, wc *webCache) {
defer wg.Done()
doc, err := goquery.NewDocument(url)
doc, err := wc.fetchUrl(url)
if err != nil {
return
log.Fatal(err)
}
addresses := doc.Find("p.rd-detail-info__rst-address")
@ -91,7 +107,7 @@ func scrapeReview(url string, out chan tabelogReview, wg *sync.WaitGroup) {
var review tabelogReview
review.Url = url
review.Name = doc.Find("div.rd-header__headline > h2 > a").Text()
review.Name = doc.Find("a.rd-header__rst-name-main").Text()
review.Address = strings.TrimSpace(addresses.First().Text())
if review.Dishes, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(2)").Text(), 8); err != nil {
@ -110,46 +126,41 @@ func scrapeReview(url string, out chan tabelogReview, wg *sync.WaitGroup) {
return
}
out <- review
rc <- review
}
func scrapeIndex(url string, out chan tabelogReview) error {
doc, err := goquery.NewDocument(url)
func scrapeIndex(url string, out chan tabelogReview, wc *webCache) {
doc, err := wc.fetchUrl(url)
if err != nil {
return err
log.Fatal(err)
}
var wg sync.WaitGroup
doc.Find("div.list-rst__header > p > a").Each(func(index int, sel *goquery.Selection) {
if href, ok := sel.Attr("href"); ok {
wg.Add(1)
go scrapeReview(href, out, &wg)
go scrapeReview(makeAbsUrl(url, href), out, &wg, wc)
}
})
wg.Wait()
return nil
if href, ok := doc.Find("a.c-pagination__target--next").Attr("href"); ok {
scrapeIndex(makeAbsUrl(url, href), out, wc)
}
}
func scrapeTabelog(filename, url string) error {
out := make(chan tabelogReview)
in := make(chan error)
go dumpReviews(filename, out, in)
t := template.New("tabelog")
t.Parse(url)
for i := 1; i <= 2; i++ {
var url bytes.Buffer
if err := t.Execute(&url, tabelogParams{i}); err != nil {
return err
}
if err := scrapeIndex(string(url.Bytes()), out); err != nil {
return err
}
func scrapeTabelog(url, jsonFile, cacheDir string) {
wc, err := newWebCache(cacheDir)
if err != nil {
log.Fatal(err)
}
close(out)
return <-in
var cond sync.Cond
rc := make(chan tabelogReview)
go dumpReviews(jsonFile, rc, &cond)
scrapeIndex(url, rc, wc)
close(rc)
cond.Wait()
}

79
webcache.go Normal file
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@ -0,0 +1,79 @@
/*
* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
* Author: Alex Yatskov <alex@foosoft.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package main
import (
"bytes"
"crypto/md5"
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"github.com/PuerkitoBio/goquery"
)
type webCache struct {
baseDir string
}
func newWebCache(baseDir string) (*webCache, error) {
if err := os.MkdirAll(baseDir, 0755); err != nil {
return nil, err
}
return &webCache{baseDir: baseDir}, nil
}
func (c *webCache) urlToLocal(url string) string {
hash := md5.New()
hash.Write([]byte(url))
return path.Join(c.baseDir, fmt.Sprintf("%x", hash.Sum(nil)))
}
func (c *webCache) fetchUrl(url string) (*goquery.Document, error) {
localPath := c.urlToLocal(url)
if file, err := os.Open(localPath); err == nil {
defer file.Close()
return goquery.NewDocumentFromReader(file)
} else {
res, err := http.Get(url)
if err != nil {
return nil, err
}
defer res.Body.Close()
var buff bytes.Buffer
if _, err := buff.ReadFrom(res.Body); err != nil {
return nil, err
}
if err := ioutil.WriteFile(localPath, buff.Bytes(), 0644); err != nil {
return nil, err
}
return goquery.NewDocumentFromReader(&buff)
}
}