Making this be more modular
This commit is contained in:
parent
6ae001c044
commit
d0cf3364ef
12
scrape.go
12
scrape.go
@ -22,17 +22,5 @@
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package main
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import "log"
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func main() {
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err := scrapeTabelog(
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"http://tabelog.com/en/kanagawa/rstLst/1/",
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"data/tabelog.json",
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"cache/webcache",
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"cache/geocache.json",
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)
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if err != nil {
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log.Fatal(err)
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}
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}
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145
scraper.go
Normal file
145
scraper.go
Normal file
@ -0,0 +1,145 @@
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/*
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* Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package main
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import (
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"log"
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"net/url"
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"sync"
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"github.com/PuerkitoBio/goquery"
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)
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type review struct {
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name string
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address string
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url string
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features map[string]float64
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latitude float64
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longitude float64
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}
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type profiler interface {
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index(doc *goquery.Document) (string, []string)
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profile(doc *goquery.Document) review
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}
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func makeAbsUrl(base, ref string) (string, error) {
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b, err := url.Parse(base)
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if err != nil {
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return "", err
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}
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r, err := url.Parse(ref)
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if err != nil {
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return "", err
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}
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return b.ResolveReference(r).String(), nil
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}
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func decodeReviews(in chan review, out chan review, cache *geoCache) {
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for {
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if r, ok := <-in; ok {
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pos, err := cache.decode(r.address)
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if err == nil {
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r.latitude = pos.Latitude
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r.longitude = pos.Longitude
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out <- r
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} else {
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log.Printf("failed to decode address for %s (%v)", r.url, err)
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}
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} else {
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close(out)
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return
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}
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}
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}
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func scrapeReview(url string, out chan review, cache *webCache, group *sync.WaitGroup, prof profiler) {
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defer group.Done()
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doc, err := cache.load(url)
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if err != nil {
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log.Printf("failed to scrape review at %s (%v)", url, err)
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} else {
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out <- prof.profile(doc)
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}
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}
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func scrapeIndex(indexUrl string, out chan review, cache *webCache, prof profiler) {
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var group sync.WaitGroup
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doc, err := cache.load(indexUrl)
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if err != nil {
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log.Printf("failed to scrape index at %s (%v)", indexUrl, err)
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return
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}
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nextIndexUrl, reviewUrls := prof.index(doc)
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if err != nil {
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log.Fatal(err)
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}
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for _, reviewUrl := range reviewUrls {
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absUrl, err := makeAbsUrl(reviewUrl, indexUrl)
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if err != nil {
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log.Fatal(err)
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}
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group.Add(1)
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go scrapeReview(absUrl, out, cache, &group, prof)
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}
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group.Wait()
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if nextIndexUrl == "" {
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close(out)
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} else {
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absUrl, err := makeAbsUrl(nextIndexUrl, indexUrl)
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if err != nil {
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log.Fatal(err)
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}
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scrapeIndex(absUrl, out, cache, prof)
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}
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}
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func scrape(url string, wc *webCache, gc *geoCache, prof profiler) []review {
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scrapeChan := make(chan review)
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decodeChan := make(chan review)
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go scrapeIndex(url, scrapeChan, wc, prof)
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go decodeReviews(scrapeChan, decodeChan, gc)
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var reviews []review
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for {
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if r, ok := <-decodeChan; ok {
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reviews = append(reviews, r)
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} else {
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return reviews
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}
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}
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}
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188
tabelog.go
188
tabelog.go
@ -23,185 +23,59 @@
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package main
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import (
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"encoding/json"
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"io/ioutil"
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"log"
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"net/url"
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"strconv"
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"strings"
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"sync"
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"github.com/PuerkitoBio/goquery"
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)
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type tabelogParams struct {
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Page int
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type tabelog struct {
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}
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type tabelogReview struct {
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Name string
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Address string
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Url string
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Dishes float64
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Service float64
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Atmosphere float64
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Cost float64
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Drinks float64
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Latitude float64
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Longitude float64
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}
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func makeAbsUrl(base, ref string) (string, error) {
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b, err := url.Parse(base)
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if err != nil {
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return "", err
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}
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r, err := url.Parse(ref)
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if err != nil {
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return "", err
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}
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return b.ResolveReference(r).String(), nil
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}
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func dumpReviews(filename string, in chan tabelogReview) error {
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var reviews []tabelogReview
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for {
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if review, ok := <-in; ok {
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reviews = append(reviews, review)
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} else {
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break
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}
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}
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js, err := json.MarshalIndent(reviews, "", " ")
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if err != nil {
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return err
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}
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if err := ioutil.WriteFile(filename, js, 0644); err != nil {
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return err
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}
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return nil
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}
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func decodeReviews(in chan tabelogReview, out chan tabelogReview, gc *geoCache) {
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for {
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if review, ok := <-in; ok {
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pos, err := gc.decode(review.Address)
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if err == nil {
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review.Latitude = pos.Latitude
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review.Longitude = pos.Longitude
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out <- review
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} else {
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log.Printf("failed to decode address for %s (%v)", review.Url, err)
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}
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} else {
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close(out)
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return
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}
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}
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}
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func scrapeReview(url string, out chan tabelogReview, wc *webCache, wg *sync.WaitGroup) {
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defer wg.Done()
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doc, err := wc.load(url)
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if err != nil {
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log.Printf("failed to scrape review at %s (%v)", url, err)
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return
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}
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addresses := doc.Find("p.rd-detail-info__rst-address")
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if addresses.Length() != 2 {
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return
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}
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var review tabelogReview
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review.Url = url
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review.Name = doc.Find("a.rd-header__rst-name-main").Text()
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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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}
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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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}
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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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}
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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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}
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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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}
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out <- review
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}
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func scrapeIndex(url string, out chan tabelogReview, wc *webCache, wg *sync.WaitGroup) {
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doc, err := wc.load(url)
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if err != nil {
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log.Printf("failed to scrape index at %s (%v)", url, err)
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return
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}
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func (t *tabelog) index(doc *goquery.Document) (string, []string) {
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var reviewUrls []string
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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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absUrl, err := makeAbsUrl(url, href)
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if err != nil {
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log.Fatal(err)
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}
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go scrapeReview(absUrl, out, wc, wg)
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reviewUrls = append(reviewUrls, href)
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}
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})
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var nextIndexUrl string
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if href, ok := doc.Find("a.c-pagination__target--next").Attr("href"); ok {
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absUrl, err := makeAbsUrl(url, href)
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if err != nil {
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log.Fatal(err)
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nextIndexUrl = href
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}
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scrapeIndex(absUrl, out, wc, wg)
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}
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return nextIndexUrl, reviewUrls
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}
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func scrapeReviews(url string, out chan tabelogReview, wc *webCache) error {
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var wg sync.WaitGroup
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scrapeIndex(url, out, wc, &wg)
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wg.Wait()
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func (t *tabelog) profile(doc *goquery.Document) *review {
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var r review
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close(out)
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r.url = doc.Url.String()
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r.name = doc.Find("a.rd-header__rst-name-main").Text()
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if addresses := doc.Find("p.rd-detail-info__rst-address"); addresses.Length() == 2 {
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r.address = strings.TrimSpace(addresses.First().Text())
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} else {
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return nil
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}
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func scrapeTabelog(url, resultFile, webCacheDir, geoCacheFile string) error {
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wc, err := newWebCache(webCacheDir)
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if err != nil {
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return err
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}
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gc, err := newGeoCache(geoCacheFile)
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if err != nil {
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return err
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var err error
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if r.features["dishes"], err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(2)").Text(), 8); err != nil {
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return nil
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}
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if r.features["service"], err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(4)").Text(), 8); err != nil {
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return nil
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}
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if r.features["atmosphere"], err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(6)").Text(), 8); err != nil {
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return nil
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}
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if r.features["cost"], err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(8)").Text(), 8); err != nil {
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return nil
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}
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if r.features["drinks"], err = strconv.ParseFloat(doc.Find("#js-rating-detail > dd:nth-child(10)").Text(), 8); err != nil {
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return nil
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}
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scrapeChan := make(chan tabelogReview, 2000)
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decodeChan := make(chan tabelogReview, 2000)
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go decodeReviews(scrapeChan, decodeChan, gc)
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scrapeReviews(url, scrapeChan, wc)
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dumpReviews(resultFile, decodeChan)
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return gc.save()
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return &r
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}
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