Crawler filter plugin for Embulk

Write short description here and build.gradle file.

• Plugin type: filter

• target_key: base_url column key name (string, require)
• max_depth_of_crawling: max depth of crawling (integer, default: unlimited)
• number_of_crawlers: parallelism (integer, default: 1)
• max_pages_to_fetch: max_pages_to_fetch (integer, default: unlimited)
• crawl_storage_folder: crawl_storage_folder (string, require)
• politeness_delay: politeness_delay (integer, default: null)
• user_agent_string: user_agent_string (string, default: null)
• output_prefix: output_prefix (string, default: "")
• connection_timeout: connection timeout millisecond (integer, default: 30000)
• socket_timeout: socket timeout millisecond (integer, default: 20000)

in:
  type: mysql
  host: dbs04
  user: application
  password: XXXXXXXX
  database: iap
  query: |
    select url from companies limit 100
filters:
  - type: crawler
    target_key: url
    number_of_crawlers: 10
    max_depth_of_crawling: 4
    politeness_delay: 100
    crawl_storage_folder: "/tmp/crawl/%s"
out:
  type: stdout

$ ./gradlew gem  # -t to watch change of files and rebuild continuously