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require_relative '../../puppet/util/lockfile'
# This class provides a simple API for managing a lock file
# whose contents are a serialized JSON object. In addition
# to querying the basic state (#locked?) of the lock, managing
# the lock (#lock, #unlock), the contents can be retrieved at
# any time while the lock is held (#lock_data). This can be
# used to store structured data (state messages, etc.) about
# the lock.
#
# @see Puppet::Util::Lockfile
class Puppet::Util::JsonLockfile < Puppet::Util::Lockfile
# Lock the lockfile. You may optionally pass a data object, which will be
# retrievable for the duration of time during which the file is locked.
#
# @param [Hash] lock_data an optional Hash of data to associate with the lock.
# This may be used to store pids, descriptive messages, etc. The
# data may be retrieved at any time while the lock is held by
# calling the #lock_data method. <b>NOTE</b> that the JSON serialization
# does NOT support Symbol objects--if you pass them in, they will be
# serialized as Strings, so you should plan accordingly.
# @return [boolean] true if lock is successfully acquired, false otherwise.
def lock(lock_data = nil)
return false if locked?
super(Puppet::Util::Json.dump(lock_data))
end
# Retrieve the (optional) lock data that was specified at the time the file
# was locked.
# @return [Object] the data object. Remember that the serialization does not
# support Symbol objects, so if your data Object originally contained symbols,
# they will be converted to Strings.
def lock_data
return nil unless file_locked?
file_contents = super
return nil if file_contents.nil? or file_contents.empty?
Puppet::Util::Json.load(file_contents)
rescue Puppet::Util::Json::ParseError
Puppet.warning _("Unable to read lockfile data from %{path}: not in JSON") % { path: @file_path }
nil
end
end
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