Twitterで特定のユーザーのフォロワー名を全部取得する

OutputTwitterFollower.md

1. フォロワーIDを取得する => 5,000*15で15分で75,000フォロワー取得可能
2. IDからユーザーを検索 => 100*900で15分で90,000分のユーザー情報取得可能

OutputTwitterFollower.scala

class OutputTwitterFollower {
  def outputTwitterFollower = {
    val targetAccount = "yabaiwebyasan"

    def getFollower(ids: Seq[Long] = Seq.empty, nextCursor: Long = -1): Future[Seq[Long]] = {
      twitterClient.followerIdsForUser(targetAccount, nextCursor, 5000).flatMap { result =>
        val _ids = ids ++ result.data.ids
        val cursor = result.data.next_cursor
        if (cursor > 0) {
          print(s"next_cursor: $cursor")
          getFollower(_ids, cursor)
        } else {
          Future successful _ids
        }
      }
    }

    import java.io.{FileOutputStream => FileStream, OutputStreamWriter => StreamWriter}
    val fileName = s"$targetAccount.txt"
    val encode = "UTF-8"
    val append = true
    val fileOutPutStream = new FileStream(fileName, append)
    val writer = new StreamWriter(fileOutPutStream, encode)
    val ids = Await.result(getFollower(), Duration.Inf)
    println(s"users by ids request num: ${ids.length}")
    ids.grouped(100).toSeq.foreach { _ids =>
      val users = Await.result(twitterClient.usersByIds(_ids), Duration.Inf).data
      users.foreach(u => writer.write(s"${u.screen_name}\n"))
    }
    writer.close()
    Future successful "ok"
  }
}