Ruby上传进度条

Question

我有一个Dropbox，它可以执行块式上传，使用红宝石-进度条作为上传进度的指示符。

当文件小于4MB (块上传的默认块大小)时，它工作得很好，但是它在任何方面都有问题：

from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/ruby-progressbar-1.2.0/lib/ruby-progressbar/components/progressable.rb:45:in `progress='
from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/ruby-progressbar-1.2.0/lib/ruby-progressbar/base.rb:138:in `with_progressables'
from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/ruby-progressbar-1.2.0/lib/ruby-progressbar/base.rb:45:in `block in progress='
from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/ruby-progressbar-1.2.0/lib/ruby-progressbar/base.rb:148:in `with_update'
from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/ruby-progressbar-1.2.0/lib/ruby-progressbar/base.rb:45:in `progress='
from /Users/peterso/Projects/slipsquare/lib/slipsquare/middleware/chunked_upload.rb:20:in `block in call'
from /opt/rubies/2.0.0-p451/lib/ruby/gems/2.0.0/gems/dropbox-api-petems-1.1.0/lib/dropbox-api/client/files.rb:50:in `chunked_upload'

我想我是在做一些愚蠢的计算，我仍然在添加进度栏的总数，即使上传已经达到完整的大小和完成。

但是我已经看了很长一段时间了，我似乎找不到一种方法，从栏中获得当前的进展，然后“如果progressbar.current_size +偏移量>总计，完成进度栏”。

代码如下所示：

file_name = env['chunked_upload_file_name']
contents  = File.open(env['chunked_upload_file_name'])
total_size = File.size(env['chunked_upload_file_name'])

say "Total Size: #{total_size} bytes"
upload_progress_bar = ProgressBar.create(:title => "Upload progress",
  :format => '%a <%B> %p%% %t',
  :starting_at => 0,
  :total => total_size)

response = env['dropbox-client'].chunked_upload file_name, contents do |offset, upload|
  upload_progress_bar.progress += offset
end

Answer 1

在每次迭代中将当前的offset添加到progress中。想象一下，您有一个10K文件，并将其上传成10块。在第一个迭代中，我们的offset是0，在下一个1中，在第三个2中，然后是3。由于您总结了offsets，您的progress将显示60%，尽管它只做了40%。

与其将offset添加到progress中，不如将progress设置为当前的offset

upload_progress_bar.progress = offset

或者更正确，因为偏移量告诉在当前块上传之前上载了什么。

upload_progress_bar.progress = offset + default_chunk_size