1
restaurant-search/tabelog.go

210 lines
5.0 KiB
Go

/*
* 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 (
"encoding/json"
"io/ioutil"
"log"
"net/url"
"strconv"
"strings"
"sync"
"github.com/FooSoft/scrape/geo"
"github.com/FooSoft/scrape/web"
"github.com/PuerkitoBio/goquery"
)
type tabelogParams struct {
Page int
}
type tabelogReview struct {
Name string
Address string
Url string
Dishes float64
Service float64
Atmosphere float64
Cost float64
Drinks float64
Latitude float64
Longitude float64
}
func makeAbsUrl(base, ref string) (string, error) {
b, err := url.Parse(base)
if err != nil {
return "", err
}
r, err := url.Parse(ref)
if err != nil {
return "", err
}
return b.ResolveReference(r).String(), nil
}
func dumpReviews(filename string, in chan tabelogReview) error {
var reviews []tabelogReview
for {
if review, ok := <-in; ok {
reviews = append(reviews, review)
} else {
break
}
}
js, err := json.MarshalIndent(reviews, "", " ")
if err != nil {
return err
}
if err := ioutil.WriteFile(filename, js, 0644); err != nil {
return err
}
return nil
}
func decodeReviews(in chan tabelogReview, out chan tabelogReview, gc *geo.Cache) {
for {
if review, ok := <-in; ok {
coord, err := gc.Decode(review.Address)
if err == nil {
review.Latitude = coord.Latitude
review.Longitude = coord.Longitude
out <- review
} else {
log.Printf("failed to decode address for %s (%v)", review.Url, err)
}
} else {
close(out)
return
}
}
}
func scrapeReview(url string, out chan tabelogReview, wc *web.Cache, wg *sync.WaitGroup) {
defer wg.Done()
doc, err := wc.Load(url)
if err != nil {
log.Printf("failed to scrape review at %s (%v)", url, err)
return
}
addresses := doc.Find("p.rd-detail-info__rst-address")
if addresses.Length() != 2 {
return
}
var review tabelogReview
review.Url = url
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 {
return
}
if review.Service, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(4)").Text(), 8); err != nil {
return
}
if review.Atmosphere, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(6)").Text(), 8); err != nil {
return
}
if review.Cost, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(8)").Text(), 8); err != nil {
return
}
if review.Drinks, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(10)").Text(), 8); err != nil {
return
}
out <- review
}
func scrapeIndex(url string, out chan tabelogReview, wc *web.Cache, wg *sync.WaitGroup) {
doc, err := wc.Load(url)
if err != nil {
log.Printf("failed to scrape index at %s (%v)", url, err)
return
}
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)
absUrl, err := makeAbsUrl(url, href)
if err != nil {
log.Fatal(err)
}
go scrapeReview(absUrl, out, wc, wg)
}
})
if href, ok := doc.Find("a.c-pagination__target--next").Attr("href"); ok {
absUrl, err := makeAbsUrl(url, href)
if err != nil {
log.Fatal(err)
}
scrapeIndex(absUrl, out, wc, wg)
}
}
func scrapeReviews(url string, out chan tabelogReview, wc *web.Cache) error {
var wg sync.WaitGroup
scrapeIndex(url, out, wc, &wg)
wg.Wait()
close(out)
return nil
}
func scrapeTabelog(url, resultFile, webCacheDir, geoCacheFile string) error {
wc, err := web.NewCache(webCacheDir)
if err != nil {
return err
}
gc, err := geo.NewCache(geoCacheFile)
if err != nil {
return err
}
scrapeChan := make(chan tabelogReview, 2000)
decodeChan := make(chan tabelogReview, 2000)
go decodeReviews(scrapeChan, decodeChan, gc)
scrapeReviews(url, scrapeChan, wc)
dumpReviews(resultFile, decodeChan)
return gc.Save()
}