Class: OsCtld::Commands::Container::SendState

Inherits:
Base
  • Object
show all
Includes:
OsCtl::Lib::Utils::Log, OsCtl::Lib::Utils::Send, OsCtl::Lib::Utils::System
Defined in:
lib/osctld/commands/container/send_state.rb

Instance Attribute Summary

Attributes inherited from Base

#client, #client_handler, #id, #opts

Instance Method Summary collapse

Methods inherited from Base

#base_execute, #call_cmd, #call_cmd!, #error, #error!, handle, #handled, #indirect?, #initialize, #manipulate, #manipulation_holder, #ok, #progress, #request_stop, run, run!

Constructor Details

This class inherits a constructor from OsCtld::Commands::Base

Instance Method Details

#clear_failed_state_snapshot(ct) ⇒ Object (protected) 



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# File 'lib/osctld/commands/container/send_state.rb', line 100

def clear_failed_state_snapshot(ct)
  snap = ct.send_log.state_snapshot
  return if snap.nil?

  progress("Removing failed cutover snapshot #{snap}")

  ct.each_dataset do |ds|
    zfs(:destroy, nil, "#{ds}@#{snap}", valid_rcs: [1])
  end

  ct.exclusively do
    ct.send_log.state_snapshot = nil
    ct.save_config
  end
end

#execute ⇒ Object 



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# File 'lib/osctld/commands/container/send_state.rb', line 12

def execute
  ct = DB::Containers.find(opts[:id], opts[:pool])
  error!('container not found') unless ct
  running = false

  manipulate(ct) do
    ct.exclusively do
      if !ct.send_log || !ct.send_log.can_send_continue?(:incremental)
        error!('invalid send sequence')
      end

      if ct.send_log.state_running.nil?
        ct.send_log.state_running = ct.state == :running
        ct.save_config
      end

      running = ct.send_log.state_running
    end

    if !opts[:clone] || opts[:consistent]
      call_cmd!(Commands::Container::Stop, id: ct.id, pool: ct.pool.name)

      # Force write-out of dirtied pages
      if Daemon.get.config.writeout_dirtied_pages?
        begin
          ct.unmount(force: true)
        rescue SystemCommandFailed => e
          log(:warn, ct, "Unable to unmount dataset for writeback: #{e.message}")
          ct.mount(force: true)
        end
      end
    end

    clear_failed_state_snapshot(ct)

    snap = "osctl-send-incr-#{Time.now.to_i}"
    zfs(:snapshot, '-r', "#{ct.dataset}@#{snap}")

    ct.exclusively do
      ct.send_log.state_snapshot = snap
      ct.save_config
    end

    if opts[:clone] && opts[:restart] && running
      call_cmd!(Commands::Container::Start, id: ct.id, pool: ct.pool.name)
    end

    progress("Syncing #{ct.dataset.relative_name}")
    send_dataset(ct, ct.dataset, snap)

    ct.dataset.descendants.each do |ds|
      progress("Syncing #{ds.relative_name}")
      send_dataset(ct, ds, snap)
    end

    ct.exclusively do
      ct.send_log.state = :incremental
      ct.save_config

      unless ct.send_log.can_send_continue?(:transfer)
        error!('invalid send sequence')
      end
    end

    progress('Starting on the target node')
    ret = system(
      *send_ssh_cmd(
        ct.pool.send_receive_key_chain,
        ct.send_log.opts,
        ['receive', 'transfer', ct.send_log.token] + \
        (running && opts[:start] ? ['start'] : [])
      )
    )

    error!('transfer failed') if ret.nil? || $?.exitstatus != 0

    ct.exclusively do
      ct.send_log.state = :transfer
      ct.send_log.opts.cloned = opts[:clone]
      ct.save_config
    end

    ok
  end
end

#send_dataset(ct, ds, snap) ⇒ Object (protected) 



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# File 'lib/osctld/commands/container/send_state.rb', line 116

def send_dataset(ct, ds, snap)
  stream = OsCtl::Lib::Zfs::Stream.new(
    ds,
    snap,
    ct.send_log.snapshots.last,
    intermediary: ct.send_log.opts.snapshots
  )
  stream.progress do |total, _transfered, changed|
    progress(type: :progress, data: {
      time: Time.now.to_i,
      size: stream.size,
      transfered: total,
      changed:
    })
  end

  mbuf_opts = Daemon.get.config.send_receive.send_mbuffer.as_hash_options
  r, send = stream.spawn_with_mbuffer(**mbuf_opts)
  pid = Process.spawn(
    *send_ssh_cmd(
      ct.pool.send_receive_key_chain,
      ct.send_log.opts,
      ['receive', 'incremental', ct.send_log.token, ds.relative_name, snap]
    ),
    in: r
  )
  r.close
  stream.monitor(send)

  _, status = Process.wait2(pid)

  return unless status.exitstatus != 0

  error!('sync failed')
end