/usr/lib/ruby/vendor_ruby/net/sftp/operations/upload.rb is in ruby-net-sftp 1:2.1.2-2.
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module Net; module SFTP; module Operations
# A general purpose uploader module for Net::SFTP. It can upload IO objects,
# files, and even entire directory trees via SFTP, and provides a flexible
# progress reporting mechanism.
#
# To upload a single file to the remote server, simply specify both the
# local and remote paths:
#
# uploader = sftp.upload("/path/to/local.txt", "/path/to/remote.txt")
#
# By default, this operates asynchronously, so if you want to block until
# the upload finishes, you can use the 'bang' variant:
#
# sftp.upload!("/path/to/local.txt", "/path/to/remote.txt")
#
# Or, if you have multiple uploads that you want to run in parallel, you can
# employ the #wait method of the returned object:
#
# uploads = %w(file1 file2 file3).map { |f| sftp.upload(f, "remote/#{f}") }
# uploads.each { |u| u.wait }
#
# To upload an entire directory tree, recursively, simply pass the directory
# path as the first parameter:
#
# sftp.upload!("/path/to/directory", "/path/to/remote")
#
# This will upload "/path/to/directory", it's contents, it's subdirectories,
# and their contents, recursively, to "/path/to/remote" on the remote server.
#
# For uploading a directory without creating it, do
# sftp.upload!("/path/to/directory", "/path/to/remote", :mkdir => false)
#
# If you want to send data to a file on the remote server, but the data is
# in memory, you can pass an IO object and upload it's contents:
#
# require 'stringio'
# io = StringIO.new(data)
# sftp.upload!(io, "/path/to/remote")
#
# The following options are supported:
#
# * <tt>:progress</tt> - either a block or an object to act as a progress
# callback. See the discussion of "progress monitoring" below.
# * <tt>:requests</tt> - the number of pending SFTP requests to allow at
# any given time. When uploading an entire directory tree recursively,
# this will default to 16, otherwise it will default to 2. Setting this
# higher might improve throughput. Reducing it will reduce throughput.
# * <tt>:read_size</tt> - the maximum number of bytes to read at a time
# from the source. Increasing this value might improve throughput. It
# defaults to 32,000 bytes.
# * <tt>:name</tt> - the filename to report to the progress monitor when
# an IO object is given as +local+. This defaults to "<memory>".
#
# == Progress Monitoring
#
# Sometimes it is desirable to track the progress of an upload. There are
# two ways to do this: either using a callback block, or a special custom
# object.
#
# Using a block it's pretty straightforward:
#
# sftp.upload!("local", "remote") do |event, uploader, *args|
# case event
# when :open then
# # args[0] : file metadata
# puts "starting upload: #{args[0].local} -> #{args[0].remote} (#{args[0].size} bytes}"
# when :put then
# # args[0] : file metadata
# # args[1] : byte offset in remote file
# # args[2] : data being written (as string)
# puts "writing #{args[2].length} bytes to #{args[0].remote} starting at #{args[1]}"
# when :close then
# # args[0] : file metadata
# puts "finished with #{args[0].remote}"
# when :mkdir then
# # args[0] : remote path name
# puts "creating directory #{args[0]}"
# when :finish then
# puts "all done!"
# end
#
# However, for more complex implementations (e.g., GUI interfaces and such)
# a block can become cumbersome. In those cases, you can create custom
# handler objects that respond to certain methods, and then pass your handler
# to the uploader:
#
# class CustomHandler
# def on_open(uploader, file)
# puts "starting upload: #{file.local} -> #{file.remote} (#{file.size} bytes)"
# end
#
# def on_put(uploader, file, offset, data)
# puts "writing #{data.length} bytes to #{file.remote} starting at #{offset}"
# end
#
# def on_close(uploader, file)
# puts "finished with #{file.remote}"
# end
#
# def on_mkdir(uploader, path)
# puts "creating directory #{path}"
# end
#
# def on_finish(uploader)
# puts "all done!"
# end
# end
#
# sftp.upload!("local", "remote", :progress => CustomHandler.new)
#
# If you omit any of those methods, the progress updates for those missing
# events will be ignored. You can create a catchall method named "call" for
# those, instead.
class Upload
include Net::SSH::Loggable
# The source of the upload (on the local server)
attr_reader :local
# The destination of the upload (on the remote server)
attr_reader :remote
# The hash of options that were given when the object was instantiated
attr_reader :options
# The SFTP session object used by this upload instance
attr_reader :sftp
# The properties hash for this object
attr_reader :properties
# Instantiates a new uploader process on top of the given SFTP session.
# +local+ is either an IO object containing data to upload, or a string
# identifying a file or directory on the local host. +remote+ is a string
# identifying the location on the remote host that the upload should
# target.
#
# This will return immediately, and requires that the SSH event loop be
# run in order to effect the upload. (See #wait.)
def initialize(sftp, local, remote, options={}, &progress) #:nodoc:
@sftp = sftp
@local = local
@remote = remote
@progress = progress || options[:progress]
@options = options
@properties = options[:properties] || {}
@active = 0
self.logger = sftp.logger
@uploads = []
@recursive = local.respond_to?(:read) ? false : ::File.directory?(local)
if recursive?
@stack = [entries_for(local)]
@local_cwd = local
@remote_cwd = remote
@active += 1
if @options[:mkdir]
sftp.mkdir(remote) do |response|
@active -= 1
raise StatusException.new(response, "mkdir `#{remote}'") unless response.ok?
(options[:requests] || RECURSIVE_READERS).to_i.times do
break unless process_next_entry
end
end
else
@active -= 1
process_next_entry
end
else
raise ArgumentError, "expected a file to upload" unless local.respond_to?(:read) || ::File.exists?(local)
@stack = [[local]]
process_next_entry
end
end
# Returns true if a directory tree is being uploaded, and false if only a
# single file is being uploaded.
def recursive?
@recursive
end
# Returns true if the uploader is currently running. When this is false,
# the uploader has finished processing.
def active?
@active > 0 || @stack.any?
end
# Forces the transfer to stop.
def abort!
@active = 0
@stack.clear
@uploads.clear
end
# Blocks until the upload has completed.
def wait
sftp.loop { active? }
self
end
# Returns the property with the given name. This allows Upload instances
# to store their own state when used as part of a state machine.
def [](name)
@properties[name.to_sym]
end
# Sets the given property to the given name. This allows Upload instances
# to store their own state when used as part of a state machine.
def []=(name, value)
@properties[name.to_sym] = value
end
private
#--
# "ruby -w" hates private attributes, so we have to do this longhand.
#++
# The progress handler for this instance. Possibly nil.
def progress; @progress; end
# A simple struct for recording metadata about the file currently being
# uploaded.
LiveFile = Struct.new(:local, :remote, :io, :size, :handle)
# The default # of bytes to read from disk at a time.
DEFAULT_READ_SIZE = 32_000
# The number of readers to use when uploading a single file.
SINGLE_FILE_READERS = 2
# The number of readers to use when uploading a directory.
RECURSIVE_READERS = 16
# Examines the stack and determines what action to take. This is the
# starting point of the state machine.
def process_next_entry
if @stack.empty?
if @uploads.any?
write_next_chunk(@uploads.first)
elsif !active?
update_progress(:finish)
end
return false
elsif @stack.last.empty?
@stack.pop
@local_cwd = ::File.dirname(@local_cwd)
@remote_cwd = ::File.dirname(@remote_cwd)
process_next_entry
elsif recursive?
entry = @stack.last.shift
lpath = ::File.join(@local_cwd, entry)
rpath = ::File.join(@remote_cwd, entry)
if ::File.directory?(lpath)
@stack.push(entries_for(lpath))
@local_cwd = lpath
@remote_cwd = rpath
@active += 1
update_progress(:mkdir, rpath)
request = sftp.mkdir(rpath, &method(:on_mkdir))
request[:dir] = rpath
else
open_file(lpath, rpath)
end
else
open_file(@stack.pop.first, remote)
end
return true
end
# Prepares to send +local+ to +remote+.
def open_file(local, remote)
@active += 1
if local.respond_to?(:read)
file = local
name = options[:name] || "<memory>"
else
file = ::File.open(local, "rb")
name = local
end
if file.respond_to?(:stat)
size = file.stat.size
else
size = file.size
end
metafile = LiveFile.new(name, remote, file, size)
update_progress(:open, metafile)
request = sftp.open(remote, "w", &method(:on_open))
request[:file] = metafile
end
# Called when a +mkdir+ request finishes, successfully or otherwise.
# If the request failed, this will raise a StatusException, otherwise
# it will call #process_next_entry to continue the state machine.
def on_mkdir(response)
@active -= 1
dir = response.request[:dir]
raise StatusException.new(response, "mkdir #{dir}") unless response.ok?
process_next_entry
end
# Called when an +open+ request finishes. Raises StatusException if the
# open failed, otherwise it calls #write_next_chunk to begin sending
# data to the remote server.
def on_open(response)
@active -= 1
file = response.request[:file]
raise StatusException.new(response, "open #{file.remote}") unless response.ok?
file.handle = response[:handle]
@uploads << file
write_next_chunk(file)
if !recursive?
(options[:requests] || SINGLE_FILE_READERS).to_i.times { write_next_chunk(file) }
end
end
# Called when a +write+ request finishes. Raises StatusException if the
# write failed, otherwise it calls #write_next_chunk to continue the
# write.
def on_write(response)
@active -= 1
file = response.request[:file]
raise StatusException.new(response, "write #{file.remote}") unless response.ok?
write_next_chunk(file)
end
# Called when a +close+ request finishes. Raises a StatusException if the
# close failed, otherwise it calls #process_next_entry to continue the
# state machine.
def on_close(response)
@active -= 1
file = response.request[:file]
raise StatusException.new(response, "close #{file.remote}") unless response.ok?
process_next_entry
end
# Attempts to send the next chunk from the given file (where +file+ is
# a LiveFile instance).
def write_next_chunk(file)
if file.io.nil?
process_next_entry
else
@active += 1
offset = file.io.pos
data = file.io.read(options[:read_size] || DEFAULT_READ_SIZE)
if data.nil?
update_progress(:close, file)
request = sftp.close(file.handle, &method(:on_close))
request[:file] = file
file.io.close
file.io = nil
@uploads.delete(file)
else
update_progress(:put, file, offset, data)
request = sftp.write(file.handle, offset, data, &method(:on_write))
request[:file] = file
end
end
end
# Returns all directory entries for the given path, removing the '.'
# and '..' relative paths.
def entries_for(local)
::Dir.entries(local).reject { |v| %w(. ..).include?(v) }
end
# Attempts to notify the progress monitor (if one was given) about
# progress made for the given event.
def update_progress(event, *args)
on = "on_#{event}"
if progress.respond_to?(on)
progress.send(on, self, *args)
elsif progress.respond_to?(:call)
progress.call(event, self, *args)
end
end
end
end; end; end
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