feng19 / spider_man

SpiderMan,a base-on Broadway fast high-level web crawling & scraping framework for Elixir.

SpiderMan

SpiderMan,a fast high-level web crawling & scraping framework for Elixir.

Inspired by Crawly(Elixir) and Scrapy(Python).

Usage

This example show how to crawly data from elixir-jobs website by use SpiderMan.

Use in livebook

Use in script or mix project

Mix.install([
  {:spider_man, "~> 0.6"},
  {:floki, "~> 0.34"},
  {:nimble_csv, "~> 1.2"}
])

defmodule SpiderList.ElixirJobs do
  @moduledoc false
  use SpiderMan
  require Logger
  alias SpiderMan.Response

  @base_url "https://elixirjobs.net/"

  def run do
    SpiderMan.run_until_zero(__MODULE__, [], 3_000)
  end

  @impl true
  def settings do
    requester_options = [
      base_url: @base_url,
      middlewares: [
        {SpiderMan.Middleware.UserAgent,
         [
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36",
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36",
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36",
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4389.82 Safari/537.36",
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4389.82 Safari/537.36",
           "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36"
         ]},
        {Tesla.Middleware.Headers,
         [
           {"referer", @base_url},
           {"accept",
            "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9"},
           {"accept-encoding", "gzip, deflate"},
           {"accept-language", "zh-CN,zh;q=0.9,zh-TW;q=0.8,en;q=0.7"}
         ]},
        Tesla.Middleware.DecompressResponse
      ]
    ]

    [
      downloader_options: [requester: {SpiderMan.Requester.Finch, requester_options}],
      spider_options: [pipelines: []],
      item_processor_options: [
        storage: [
          {SpiderMan.Storage.ETS, "./data/jobs.ets"},
          {SpiderMan.Storage.CSV,
           file: "./data/jobs.csv",
           headers: [
             :link,
             :title,
             :sub_title,
             :date,
             :workplace,
             :type
           ]}
        ]
      ]
    ]
  end

  @impl true
  def init(state) do
    build_request(@base_url)
    |> set_flag(:first_page)
    |> then(&SpiderMan.insert_request(__MODULE__, &1))

    state
  end

  @impl true
  def handle_response(%Response{env: env, flag: :first_page}, _context) do
    total_page =
      Regex.run(~r/Showing page 1 of (\d+)/, env.body, capture: :all_but_first)
      |> hd()
      |> String.to_integer()

    Logger.info("total: #{total_page}")

    requests =
      Enum.map(2..total_page, fn n ->
        build_request("/?page=#{n}")
        |> set_flag({:list_page, n})
      end)

    handle_list_page(env.body, 1)
    |> Map.put(:requests, requests)
  end

  def handle_response(%Response{env: env, flag: {:list_page, n}}, _context) do
    handle_list_page(env.body, n)
  end

  defp handle_list_page(body, n) do
    Logger.info("processing page #{n}")
    {:ok, document} = Floki.parse_document(body)

    jobs =
      Floki.find(document, ".offers-index")
      |> hd()
      |> Floki.children(include_text: false)
      |> Enum.filter(&match?({"a", _, _}, &1))

    items =
      Enum.map(jobs, fn job ->
        title = Floki.find(job, ".title strong") |> Floki.text() |> String.trim()
        sub_title = Floki.find(job, ".title small") |> Floki.text() |> String.trim()
        link = Floki.attribute(job, "a", "href") |> hd()

        [_, date, _, workplace, _, type] =
          Floki.find(job, ".control .tag")
          |> Enum.map(&(&1 |> Floki.text() |> String.trim()))

        build_item(
          link,
          %{
            link: @base_url <> String.slice(link, 1..-1),
            title: title,
            sub_title: sub_title,
            date: date,
            workplace: workplace,
            type: type
          }
        )
      end)

    %{items: items}
  end
end

SpiderList.ElixirJobs.run()

copy this script and save to elixir_jobs.exs and then start by command:

elixir elixir_jobs.exs

Copyright and License

Copyright (c) 2023 feng19

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.