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Added examples of integration with Go Colly https://github.com/gocoll…
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paramaw committed Aug 17, 2021
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6 changes: 4 additions & 2 deletions README.md
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Expand Up @@ -189,8 +189,10 @@ Read more about [certutil](https://web.archive.org/web/20160612045445/http://win

### Node.js

The [following example](examples/nodejs/) demonstrates how to integrate Till with Node.js based scrapers.
The [Node.js example](examples/nodejs/) demonstrates how to integrate Till with Node.js based scrapers.

### Go

The [following example](examples/go/standard) demonstrates how to integrate Till with Go's net/http standard library.
The [Go net/http example](examples/go/standard) demonstrates how to integrate Till with Go's net/http standard library.

The [Go Colly example](examples/go/colly) demonstrates how to integrate Till with [Colly](https://github.com/gocolly/colly).
13 changes: 13 additions & 0 deletions examples/go/colly/README.md
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# Integrating Till with Go Colly

You can integrate Till with [Colly](https://github.com/gocolly/colly)

## 1. Install Till
Follow the instructions to [install Till](https://till.datahen.com/docs/installation)

## 2. Run the example file

To run the example file:
```bash
$ go run main.go
```
12 changes: 12 additions & 0 deletions examples/go/colly/go.mod
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module github.com/DataHenHQ/till/examples/go/colly

go 1.16

require (
github.com/PuerkitoBio/goquery v1.7.1 // indirect
github.com/antchfx/xmlquery v1.3.6 // indirect
github.com/gocolly/colly/v2 v2.1.0
github.com/temoto/robotstxt v1.1.2 // indirect
golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d // indirect
google.golang.org/appengine v1.6.7 // indirect
)
132 changes: 132 additions & 0 deletions examples/go/colly/go.sum
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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
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=
56 changes: 56 additions & 0 deletions examples/go/colly/main.go
Original file line number Diff line number Diff line change
@@ -0,0 +1,56 @@
// Tutorial from from https://github.com/gocolly/colly/blob/master/_examples/basic/basic.go
// modified to integrate with Till
package main

import (
"crypto/tls"
"fmt"
"log"
"net/http"
"net/url"

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

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

// Integration with Till
proxyUrl, err := url.Parse("http://localhost:2933")
if err != nil {
log.Fatal(err)
}
tilltransport := http.Transport{
Proxy: http.ProxyURL(proxyUrl),
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
c.WithTransport(&tilltransport)

// Add custom headers to tell Till what to do
c.OnRequest(func(req *colly.Request) {
// Add the header to force a Cache Miss on Till
req.Headers.Add("X-DH-Cache-Freshness", "now")
})

// On every a element which has href attribute call callback
c.OnHTML("a[href]", func(e *colly.HTMLElement) {
link := e.Attr("href")
// Print link
fmt.Printf("Link found: %q -> %s\n", e.Text, 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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