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pholcusvsferret

Apache-2.0 6 1 7,526
Feb 15 2020 v1.3.4(4 years ago)
5,606 7 52 Apache-2.0
v0.18.0(1 year, 9 days ago) Aug 06 2019 58.1 thousand (month)

Pholcus is a minimalistic web crawler library written in the Go programming language. It is designed to be flexible and easy to use, and it supports concurrent, distributed, and modular crawling.

Note that Pholcus is documented and maintained in the Chinese language and has no english resources other than the code source itself.

Ferret is a web scraping system. It aims to simplify data extraction from the web for UI testing, machine learning, analytics and more. ferret allows users to focus on the data. It abstracts away the technical details and complexity of underlying technologies using its own declarative language. It is extremely portable, extensible, and fast.

Features

  • Declarative language
  • Support of both static and dynamic web pages
  • Embeddable
  • Extensible

Ferret is always implemented in Python through pyfer

Example Use


package main

import (
    "github.com/henrylee2cn/pholcus/exec"
    _ "github.com/henrylee2cn/pholcus/spider/standard" // standard spider
)

func main() {
    // create spider object
    spider := exec.NewSpider(exec.NewTask("demo", "https://www.example.com"))
    // add a callback for URL route by regex pattern. In this case it's any route:
    spider.AddRule(".*", "Parse")
    // Start spider
    spider.Start()
}

// define callback here
func Parse(self *exec.Spider, doc *goquery.Document) {
    // callbacks receive HTMl document reference and 
}
// Example scraper for Google in Ferret:
LET google = DOCUMENT("https://www.google.com/", {
    driver: "cdp",
    userAgent: "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.87 Safari/537.36"
})

HOVER(google, 'input[name="q"]')
WAIT(RAND(100))
INPUT(google, 'input[name="q"]', @criteria, 30)
WAIT(RAND(100))
CLICK(google, 'input[name="btnK"]')

WAITFOR EVENT "navigation" IN google

WAIT_ELEMENT(google, "#res")

LET results = ELEMENTS(google, X("//*[text() = 'Search Results']/following-sibling::*/*"))

FOR el IN results
    RETURN {
        title: INNER_TEXT(el, 'h3')?,
        description: INNER_TEXT(el, X("//em/parent::*")),
        url: ELEMENT(el, 'a')?.attributes.href
    }

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