Class: S3snapshot::DirDownload

Inherits:
SyncOp
  • Object
show all
Defined in:
lib/s3snapshot/dir_download.rb

Constant Summary

Constants inherited from SyncOp

SyncOp::COMPLETE_EXTENSION, SyncOp::COMPLETE_FILE, SyncOp::COMPLETE_MARKER

Instance Method Summary collapse

Methods inherited from SyncOp

#aws, #bucket, #complete_path, #complete_prefix, #timepath

Constructor Details

#initialize(aws_id, aws_key, bucket_name, prefix, time, local_dir) ⇒ DirDownload

Returns a new instance of DirDownload.



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# File 'lib/s3snapshot/dir_download.rb', line 15

def initialize(aws_id, aws_key, bucket_name, prefix, time, local_dir )
  super(aws_id, aws_key, bucket_name)
  @prefix = prefix
  @time = time
  @local_dir = local_dir
end

Instance Method Details

#download ⇒ Object 



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# File 'lib/s3snapshot/dir_download.rb', line 22

def download
  
  
  #Check if the backup is complete
  manager = BackupManager.new(@aws_id, @aws_key, @bucket_name)
  
  unless manager.exists?(@prefix, @time)
    $stderr.puts "Backup with prefix '#{@prefix}' and time #{@time.iso8601} does not exist.  Please check the prefix and time"
    return
  end
  
  unless manager.complete?(@prefix, @time)
    $stderr.puts "Backup with prefix '#{@prefix}' and time #{@time.iso8601} is not complete.  The backup is either in progress or never finished.  This snapshot is not safe to restore!"
    return
  end
  
  
  #Get all files from this backup
  files = manager.list_files(@prefix, @time)
  
  #Make the local directory
  unless File.directory?(@local_dir)
    FileUtils.mkdir(@local_dir)
  end
  
  prefix_path = timepath(@prefix, @time)
  
  
  files.each do |remotefile|
    #We have to reload state from s3.  Otherwise we can't download when the restore process takes a while
    destination_path = "#{@local_dir}/#{remotefile.key[prefix_path.length+1..-1]}"
    
    directory = destination_path[0..-File.basename(destination_path).length-1]
    
    #Create the parent directory for the file if it doesn't exist
    unless File.directory?(directory)
      FileUtils.mkdir(directory)
    end
    
    puts "downloading '#{remotefile.key}' to '#{destination_path}'"
    
    File.open(destination_path, File::RDWR|File::CREAT) do |file|
      bucket.files.get(remotefile.key) do |chunk, remaining_bytes, total_bytes|
        file.write(chunk)
        puts "#{remaining_bytes}b of #{total_bytes}b remaining"
      end
    end
    
  end
  
  
  
  puts "Writing complete marker"
  
  
  puts "backup complete!"
end