+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: AGPL-3.0
+
+require 'tempfile'
+
class Node < ArvadosModel
include HasUuid
include KindAndEtag
# Assign slot_number
if self.slot_number.nil?
- try_slot = 0
- begin
- self.slot_number = try_slot
+ while true
+ n = self.class.available_slot_number
+ if n.nil?
+ raise "No available node slots"
+ end
+ self.slot_number = n
begin
self.save!
break
rescue ActiveRecord::RecordNotUnique
- try_slot += 1
+ # try again
end
- raise "No available node slots" if try_slot == Rails.configuration.max_compute_nodes
- end while true
+ end
end
# Assign hostname
protected
+ def self.available_slot_number
+ # Join the sequence 1..max with the nodes table. Return the first
+ # (i.e., smallest) value that doesn't match the slot_number of any
+ # existing node.
+ connection.exec_query('SELECT n FROM generate_series(1, $1) AS slot(n)
+ LEFT JOIN nodes ON n=slot_number
+ WHERE slot_number IS NULL
+ LIMIT 1',
+ # query label:
+ 'Node.available_slot_number',
+ # [col_id, val] for $1 vars:
+ [[nil, Rails.configuration.max_compute_nodes]],
+ ).rows.first.andand.first
+ end
+
def ensure_ping_secret
self.info['ping_secret'] ||= rand(2**256).to_s(36)
end
}
if Rails.configuration.dns_server_conf_dir and Rails.configuration.dns_server_conf_template
+ tmpfile = nil
begin
begin
template = IO.read(Rails.configuration.dns_server_conf_template)
- rescue => e
+ rescue IOError, SystemCallError => e
logger.error "Reading #{Rails.configuration.dns_server_conf_template}: #{e.message}"
raise
end
hostfile = File.join Rails.configuration.dns_server_conf_dir, "#{hostname}.conf"
- File.open hostfile+'.tmp', 'w' do |f|
+ Tempfile.open(["#{hostname}-", ".conf.tmp"],
+ Rails.configuration.dns_server_conf_dir) do |f|
+ tmpfile = f.path
f.puts template % template_vars
end
- File.rename hostfile+'.tmp', hostfile
- rescue => e
+ File.rename tmpfile, hostfile
+ rescue IOError, SystemCallError => e
logger.error "Writing #{hostfile}: #{e.message}"
ok = false
+ ensure
+ if tmpfile and File.file? tmpfile
+ # Cleanup remaining temporary file.
+ File.unlink tmpfile
+ end
end
end
# Typically, this is used to trigger a dns server restart
f.puts Rails.configuration.dns_server_reload_command
end
- rescue => e
+ rescue IOError, SystemCallError => e
logger.error "Unable to write #{restartfile}: #{e.message}"
ok = false
end