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require 'thread'
require 'net/ssh'
require 'net/ssh/gateway'
require 'net/ssh/multi/channel'
module Net; module SSH; module Multi
class Session
attr_reader :connections
attr_reader :gateway
class Collector
attr_reader :specifications
def initialize
@specifications = []
end
def to(host, user, options={})
@specifications << [host, user, options]
self
end
end
def initialize
@connections = []
@gateway = nil
@mutex = Mutex.new
end
def via(*args)
if connection_specification?(args)
@gateway = Net::SSH::Gateway.new(*args)
elsif args.length == 1
@gateway = args.first
else
raise ArgumentError, "expected either a connection specification or a Net::SSH::Gateway instance"
end
self
end
def use(*list)
@connections += list.each { |c| c[:host] = c.host }
self
end
def connect(*args)
if connection_specification?(args)
establish_connection(*args)
elsif args.any?
raise ArgumentError, "expected either a connection specification or a block"
end
if block_given?
collector = Collector.new
yield collector
mutex = Mutex.new
threads = collector.specifications.map do |host, user, options|
Thread.new { establish_connection(host, user, options) }
end
threads.each { |t| t.join }
end
self
end
def close
connections.each { |connection| connection.channels.each { |id, channel| channel.close } }
loop(0) { busy?(true) }
connections.each { |connection| connection.transport.close }
gateway.shutdown! if gateway
end
def busy?(include_invisible=false)
connections.any? { |connection| connection.busy?(include_invisible) }
end
alias :loop_forever :loop
def loop(wait=nil, &block)
running = block || Proc.new { |c| busy? }
loop_forever { break unless process(wait, &running) }
end
def process(wait=nil, &block)
connections.each { |c| return false unless c.preprocess(&block) }
writers_by_connection, readers_by_connection = {}, {}
writers = connections.map do |c|
c.listeners.keys.select do |w|
writers_by_connection[c] ||= []
writers_by_connection[c] << w
w.respond_to?(:pending_write?) && w.pending_write?
end
end.flatten
readers = connections.map { |c| readers_by_connection[c] = c.listeners.keys }.flatten
readers, writers = IO.select(readers, writers, nil, wait)
connections.each do |c|
readers_for_this = readers_by_connection[c] & (readers || [])
writers_for_this = writers_by_connection[c] & (writers || [])
return false unless c.postprocess(readers_for_this, writers_for_this)
end
return true
end
def send_global_request(type, *extra, &callback)
connections.each { |connection| connection.send_global_request(type, *extra, &callback) }
self
end
def open_channel(type="session", *extra, &on_confirm)
channels = connections.map do |connection|
channel = connection.open_channel(type, *extra, &on_confirm)
channel[:host] = connection[:host]
channel
end
Multi::Channel.new(self, channels)
end
def exec(command, &block)
open_channel do |channel|
channel.exec(command) do |ch, success|
raise "could not execute command: #{command.inspect} (#{ch[:host]})" unless success
channel.on_data do |ch, data|
if block
block.call(ch, :stdout, data)
else
data.chomp.each_line do |line|
$stdout.puts("[#{ch[:host]}] #{line}")
end
end
end
channel.on_extended_data do |ch, type, data|
if block
block.call(ch, :stderr, data)
else
data.chomp.each_line do |line|
$stderr.puts("[#{ch[:host]}] #{line}")
end
end
end
channel.on_request("exit-status") do |ch, data|
ch[:exit_status] = data.read_long
end
end
end
end
def exec!(command, &block)
block ||= Proc.new do |ch, type, data|
ch[:result] ||= {}
ch[:result][ch.connection[:host]] ||= ""
ch[:result][ch.connection[:host]] << data
end
channel = exec(command, &block)
channel.wait
return channel[:result]
end
def send_message(message)
connections.each { |connection| connection.send_message(message) }
self
end
private
def connection_specification?(args)
args.length == 2 || (args.length == 3 && args.last.is_a?(Hash))
end
def establish_connection(host, user, options={})
connection = gateway ? gateway.ssh(host, user, options) :
Net::SSH.start(host, user, options)
connection[:host] = host
@mutex.synchronize { @connections.push(connection) }
return connection
end
end
end; end; end
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