Class: COS::Slice

Inherits:
Checkpoint show all
Includes:
Logging
Defined in:
lib/cos/slice.rb

Overview

分片大文件上传, 支持断点续传, 支持多线程

Constant Summary collapse

DEFAULT_SLICE_SIZE =

默认分片大小 3M

3 * 1024 * 1024

Constants included from Logging

Logging::DEFAULT_LOG_FILE, Logging::MAX_NUM_LOG, Logging::ROTATE_SIZE

Constants inherited from Checkpoint

Checkpoint::DEFAULT_THREADS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

#logger, set_logger

Methods included from COS::Struct::Base::AttrHelper

#optional_attrs, #required_attrs

Constructor Details

#initialize(opts = {}) ⇒ Slice

Returns a new instance of Slice.



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# File 'lib/cos/slice.rb', line 20

def initialize(opts = {})
  super(opts)

  @cpt_file = options[:cpt_file] || "#{File.expand_path(file_src)}.cpt"
end

Instance Attribute Details

#cpt_file ⇒ Object

Returns the value of attribute cpt_file.



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# File 'lib/cos/slice.rb', line 18

def cpt_file
  @cpt_file
end

#offset ⇒ Object

Returns the value of attribute offset.



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# File 'lib/cos/slice.rb', line 18

def offset
  @offset
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/cos/slice.rb', line 18

def result
  @result
end

#session ⇒ Object

Returns the value of attribute session.



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# File 'lib/cos/slice.rb', line 18

def session
  @session
end

#slice_size ⇒ Object

Returns the value of attribute slice_size.



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# File 'lib/cos/slice.rb', line 18

def slice_size
  @slice_size
end

Instance Method Details

#checkpoint ⇒ Object

断点续传状态记录

Examples:

states = {
  :session => 'session',
  :offset => 0,
  :slice_size => 2048,
  :file => 'file',
  :file_meta => {
    :mtime => Time.now,
    :sha1 => 'file sha1',
    :size => 10000,
  },
  :parts => [
    {:number => 1, :range => [0, 100], :done => false},
    {:number => 2, :range => [100, 200], :done => true}
  ],
  :sha1 => 'checkpoint file sha1'
}


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# File 'lib/cos/slice.rb', line 103

def checkpoint
  logger.debug("Make checkpoint, options[:disable_cpt]: #{options[:disable_cpt] == true}")

  ensure_file_not_changed

  parts = sync_get_all_parts
  states = {
      :session    => session,
      :slice_size => slice_size,
      :offset     => offset,
      :file       => file_src,
      :file_meta  => @file_meta,
      :parts      => parts
  }

  done = parts.count { |p| p[:done] }

  # 上传进度回调
  if progress
    percent = (offset + done*slice_size).to_f / states[:file_meta][:size]
    progress.call(percent > 1 ? 1.to_f : percent)
  end

  write_checkpoint(states, cpt_file) unless options[:disable_cpt]

  logger.debug("Upload Parts #{done}/#{states[:parts].count}")
end

#upload ⇒ Object

开始上传



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# File 'lib/cos/slice.rb', line 27

def upload
  logger.info("Begin upload, file: #{file_src}, threads: #{@num_threads}")

  # 重建断点续传或重新从服务器初始化分片上传
  # 有可能sha命中直接完成
  data = rebuild
  return data if data

  # 文件分片
  divide_parts if @parts.empty?

  # 未完成的片段
  @todo_parts = @parts.reject { |p| p[:done] }

  # 多线程上传
  Thread.abort_on_exception = true

  threads = []
  @num_threads.times do
    threads << Thread.new do
      loop do
        # 获取下一个未上传的片段
        p = sync_get_todo_part
        break unless p

        # 上传片段
        upload_part(p)
      end
    end
  end

  threads.each do |thread|
    begin
      thread.join
    rescue => error
      unless finish?
        # 部分服务端异常需要重新初始化, 可能上传已经完成了
        if error.is_a?(ServerError) and error.error_code == -288
          File.delete(cpt_file) unless options[:disable_cpt]
        end
        threads.each {|t| t.exit}
        raise error
      end
    end
  end

  # 返回100%的进度
  progress.call(1.to_f) if progress

  # 上传完成, 删除checkpoint文件
  File.delete(cpt_file) unless options[:disable_cpt]

  logger.info("Done upload, file: #{@file_src}")

  # 返回文件信息
  result
end