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restaurant-search/tabelog.go

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/*
* 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"
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"encoding/json"
"io/ioutil"
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"log"
"strconv"
"strings"
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"sync"
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"text/template"
"github.com/PuerkitoBio/goquery"
)
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const ()
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type tabelogParams struct {
Page int
}
type tabelogReview struct {
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Name string
Address string
Dishes float64
Service float64
Atmosphere float64
Cost float64
Drinks float64
Url string
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}
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func dumpReviews(filename string, in chan tabelogReview, out chan error) {
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count := 1
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var reviews []tabelogReview
for {
if review, ok := <-in; ok {
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log.Printf("%d\t%s", count, review.Name)
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reviews = append(reviews, review)
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count++
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} else {
break
}
}
js, err := json.MarshalIndent(reviews, "", " ")
if err != nil {
out <- err
return
}
out <- ioutil.WriteFile(filename, js, 0644)
}
func scrapeReview(url string, out chan tabelogReview, wg *sync.WaitGroup) {
defer wg.Done()
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doc, err := goquery.NewDocument(url)
if err != nil {
return
}
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addresses := doc.Find("p.rd-detail-info__rst-address")
if addresses.Length() != 2 {
return
}
var review tabelogReview
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review.Url = url
review.Name = doc.Find("div.rd-header__headline > h2 > a").Text()
review.Address = strings.TrimSpace(addresses.First().Text())
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if review.Dishes, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(2)").Text(), 8); err != nil {
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return
}
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if review.Service, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(4)").Text(), 8); err != nil {
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return
}
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if review.Atmosphere, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(6)").Text(), 8); err != nil {
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return
}
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if review.Cost, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(8)").Text(), 8); err != nil {
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return
}
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if review.Drinks, err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(10)").Text(), 8); err != nil {
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return
}
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out <- review
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}
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func scrapeIndex(url string, out chan tabelogReview) error {
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doc, err := goquery.NewDocument(url)
if err != nil {
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return err
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}
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var wg sync.WaitGroup
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doc.Find("div.list-rst__header > p > a").Each(func(index int, sel *goquery.Selection) {
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if href, ok := sel.Attr("href"); ok {
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wg.Add(1)
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go scrapeReview(href, out, &wg)
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}
})
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wg.Wait()
return nil
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}
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func scrapeTabelog(filename, url string) error {
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out := make(chan tabelogReview)
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in := make(chan error)
go dumpReviews(filename, out, in)
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t := template.New("tabelog")
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t.Parse(url)
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for i := 1; i <= 2; i++ {
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var url bytes.Buffer
if err := t.Execute(&url, tabelogParams{i}); err != nil {
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return err
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}
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if err := scrapeIndex(string(url.Bytes()), out); err != nil {
return err
}
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}
close(out)
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return <-in
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}