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require 'thread'
require 'net/ssh/gateway'
require 'net/ssh/multi/server'
require 'net/ssh/multi/channel'
module Net; module SSH; module Multi
class Session
attr_reader :servers
attr_reader :default_gateway
attr_reader :groups
def initialize
@servers = []
@groups = {}
@gateway = nil
@connections_mutex = Mutex.new
@groups_mutex = Mutex.new
@active_groups = {}
@open_groups = []
end
def group(*args)
mapping = args.last.is_a?(Hash) ? args.pop : {}
if mapping.any? && block_given?
raise ArgumentError, "must provide group mapping OR block, not both"
elsif block_given?
begin
saved_groups = @open_groups.dup
@open_groups.concat(args.map { |a| a.to_sym }).uniq!
yield self if block_given?
ensure
@open_groups.replace(saved_groups)
end
else
mapping.each do |key, value|
(@open_groups + Array(key)).uniq.each do |grp|
(groups[grp.to_sym] ||= []).concat(Array(value))
end
end
end
end
def via(host, user, options={})
@default_gateway = Net::SSH::Gateway.new(host, user, options)
self
end
def use(host, user, options={})
server = Server.new(host, user, {:via => default_gateway}.merge(options))
unless servers.include?(server)
servers << server
group [] => server
end
server
end
def with(*groups)
saved_groups = @active_groups.dup
new_map = groups.inject({}) do |map, group|
if group.is_a?(Hash)
group.each do |gr, value|
raise ArgumentError, "the value for any group must be a Hash" unless value.is_a?(Hash)
map[gr] = (@active_groups[gr] || {}).merge(value)
end
else
map[group] = @active_groups[group] || {}
end
map
end
@active_groups.update(new_map)
yield self
ensure
@active_groups.replace(saved_groups)
end
def active_sessions
list = if @active_groups.empty?
servers
else
@active_groups.inject([]) do |list, (group, properties)|
list.concat(groups[group].select { |server| properties.all? { |prop, value| server[prop] == value } })
end
end
sessions_for(list.uniq)
end
def connect!
active_sessions
self
end
def close
servers.each { |server| server.close_channels }
loop(0) { busy?(true) }
servers.each { |server| server.close }
default_gateway.shutdown! if default_gateway
end
def busy?(include_invisible=false)
servers.any? { |server| server.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)
return false if servers.any? { |server| !server.preprocess(&block) }
readers = servers.map { |s| s.readers }.flatten
writers = servers.map { |s| s.writers }.flatten
readers, writers, = IO.select(readers, writers, nil, wait)
return servers.all? { |server| server.postprocess(readers, writers) }
end
def send_global_request(type, *extra, &callback)
active_sessions.each { |ssh| ssh.send_global_request(type, *extra, &callback) }
self
end
def open_channel(type="session", *extra, &on_confirm)
channels = active_sessions.map do |ssh|
channel = ssh.open_channel(type, *extra, &on_confirm)
channel[:server] = ssh[:server]
channel[:host] = ssh[:server].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[:server]] ||= ""
ch[:result][ch[:server]] << data
end
channel = exec(command, &block)
channel.wait
return channel[:result]
end
private
def sessions_for(servers)
threads = servers.map { |server| Thread.new { server.session(true) } }
threads.each { |thread| thread.join }
servers.map { |server| server.session }
end
end
end; end; end
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