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INIT: some initial work on web scrapper, tutorial-like
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@MKaczkow
MKaczkow committed May 24, 2024
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3 changes: 3 additions & 0 deletions .gitignore
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# Data
web_crawler/data.csv

# Binaries for programs and plugins
*.exe
*.exe~
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5 changes: 5 additions & 0 deletions README.md
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Expand Up @@ -3,6 +3,7 @@ repo for basic tutorial-based Golang study

### todo
- [ ] smth with `Hanoi tower`
- [ ] web crawler with `colly`
- [x] finish `book`
- [x] fix `web_app_bis` (if no JSON is provided, some routes crash)
- [x] init `book`
Expand Down Expand Up @@ -75,6 +76,10 @@ repo for basic tutorial-based Golang study
* [another gin tutorial yt](https://www.youtube.com/watch?v=LOn1GUsjOF4&ab_channel=DavidAlsh)
* [example REST API using gin](https://github.com/restuwahyu13/go-rest-api)
* [another example REST API using gin](https://github.com/gothinkster/golang-gin-realworld-example-app)
* `colly`
* [github examples](https://github.com/gocolly/colly/tree/master/_examples)
* [some tutorial](https://dev.to/claudbytes/build-a-web-scraper-with-go-3jod)
* [save data to csv after scrapping](https://webscraping.ai/faq/colly/how-do-i-save-the-scraped-data-to-a-file-using-colly)
* `misc`
* [blogpost on bulldogjob](https://bulldogjob.pl/readme/pisz-w-jezyku-go-jak-senior)
* [official docker image](https://hub.docker.com/_/golang)
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27 changes: 27 additions & 0 deletions web_crawler/Makefile
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.DEFAULT_GOAL := run

fmt:
go fmt ./...
.PHONY: fmt

lint: fmt
golint ./...
.PHONY: lint

vet: fmt
go vet ./...
.PHONY: vet

shadow: vet
shadow ./...
.PHONY: shadow

build: vet
go build main.go
.PHONY: build

run: vet
go run main.go
.PHONY: run


22 changes: 22 additions & 0 deletions web_crawler/go.mod
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module web-scrapper

go 1.23

require (
github.com/PuerkitoBio/goquery v1.5.1 // indirect
github.com/andybalholm/cascadia v1.2.0 // indirect
github.com/antchfx/htmlquery v1.2.3 // indirect
github.com/antchfx/xmlquery v1.2.4 // indirect
github.com/antchfx/xpath v1.1.8 // indirect
github.com/gobwas/glob v0.2.3 // indirect
github.com/gocolly/colly/v2 v2.1.0 // indirect
github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
github.com/golang/protobuf v1.4.2 // indirect
github.com/kennygrant/sanitize v1.2.4 // indirect
github.com/saintfish/chardet v0.0.0-20120816061221-3af4cd4741ca // indirect
github.com/temoto/robotstxt v1.1.1 // indirect
golang.org/x/net v0.0.0-20200602114024-627f9648deb9 // indirect
golang.org/x/text v0.3.2 // indirect
google.golang.org/appengine v1.6.6 // indirect
google.golang.org/protobuf v1.24.0 // indirect
)
114 changes: 114 additions & 0 deletions web_crawler/go.sum
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/PuerkitoBio/goquery v1.5.1 h1:PSPBGne8NIUWw+/7vFBV+kG2J/5MOjbzc7154OaKCSE=
github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
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google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.24.0 h1:UhZDfRO8JRQru4/+LlLE0BRKGF8L+PICnvYZmx/fEGA=
google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
52 changes: 52 additions & 0 deletions web_crawler/main.go
View file
Original file line number Diff line number Diff line change
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package main

import (
"encoding/csv"
"fmt"
"log"
"os"

"github.com/gocolly/colly/v2"
)

func main() {

// Create a file to save the scraped data
f, err := os.Create("data.csv")
if err != nil {
log.Fatal("Cannot create file", err)
}
defer f.Close()

// Create a CSV writer to write data to the file
writer := csv.NewWriter(f)
defer writer.Flush()

// Instantiate default collector
c := colly.NewCollector(
// Visit only domains: hackerspaces.org, wiki.hackerspaces.org
colly.AllowedDomains("hackerspaces.org", "wiki.hackerspaces.org"),
)

// On every a element which has href attribute call callback
c.OnHTML("a[href]", func(e *colly.HTMLElement) {
link := e.Attr("href")
linkText := e.Text
// Print link
fmt.Printf("Link found: %q -> %s\n", e.Text, link)
// Write the data to the CSV file
writer.Write([]string{linkText, link})
// Visit link found on page
// Only those links are visited which are in AllowedDomains
c.Visit(e.Request.AbsoluteURL(link))
})

// Before making a request print "Visiting ..."
c.OnRequest(func(r *colly.Request) {
fmt.Println("Visiting", r.URL.String())

})

// Start scraping on https://hackerspaces.org
c.Visit("https://hackerspaces.org/")
}

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