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| Current File : //usr/share/ruby/vendor_ruby/puppet/environments.rb |
# @api private
module Puppet::Environments
class EnvironmentNotFound < Puppet::Error
def initialize(environment_name, original = nil)
environmentpath = Puppet[:environmentpath]
super("Could not find a directory environment named '#{environment_name}' anywhere in the path: #{environmentpath}. Does the directory exist?", original)
end
end
# @api private
module EnvironmentCreator
# Create an anonymous environment.
#
# @param module_path [String] A list of module directories separated by the
# PATH_SEPARATOR
# @param manifest [String] The path to the manifest
# @return A new environment with the `name` `:anonymous`
#
# @api private
def for(module_path, manifest)
Puppet::Node::Environment.create(:anonymous,
module_path.split(File::PATH_SEPARATOR),
manifest)
end
end
# Provide any common methods that loaders should have. It requires that any
# classes that include this module implement get
# @api private
module EnvironmentLoader
# @!macro loader_get_or_fail
def get!(name)
environment = get(name)
if environment
environment
else
raise EnvironmentNotFound, name
end
end
def clear_all
root = Puppet.lookup(:root_environment) { nil }
root.instance_variable_set(:@future_parser, nil) unless root.nil?
end
end
# @!macro [new] loader_search_paths
# A list of indicators of where the loader is getting its environments from.
# @return [Array<String>] The URIs of the load locations
#
# @!macro [new] loader_list
# @return [Array<Puppet::Node::Environment>] All of the environments known
# to the loader
#
# @!macro [new] loader_get
# Find a named environment
#
# @param name [String,Symbol] The name of environment to find
# @return [Puppet::Node::Environment, nil] the requested environment or nil
# if it wasn't found
#
# @!macro [new] loader_get_conf
# Attempt to obtain the initial configuration for the environment. Not all
# loaders can provide this.
#
# @param name [String,Symbol] The name of the environment whose configuration
# we are looking up
# @return [Puppet::Setting::EnvironmentConf, nil] the configuration for the
# requested environment, or nil if not found or no configuration is available
#
# @!macro [new] loader_get_or_fail
# Find a named environment or raise
# Puppet::Environments::EnvironmentNotFound when the named environment is
# does not exist.
#
# @param name [String,Symbol] The name of environment to find
# @return [Puppet::Node::Environment] the requested environment
# A source of pre-defined environments.
#
# @api private
class Static
include EnvironmentCreator
include EnvironmentLoader
def initialize(*environments)
@environments = environments
end
# @!macro loader_search_paths
def search_paths
["data:text/plain,internal"]
end
# @!macro loader_list
def list
@environments
end
# @!macro loader_get
def get(name)
@environments.find do |env|
env.name == name.intern
end
end
# Returns a basic environment configuration object tied to the environment's
# implementation values. Will not interpolate.
#
# @!macro loader_get_conf
def get_conf(name)
env = get(name)
if env
Puppet::Settings::EnvironmentConf.static_for(env, Puppet[:parser])
else
nil
end
end
end
# A source of unlisted pre-defined environments.
#
# Used only for internal bootstrapping environments which are not relevant
# to an end user (such as the fall back 'configured' environment).
#
# @api private
class StaticPrivate < Static
# Unlisted
#
# @!macro loader_list
def list
[]
end
end
# Old-style environments that come either from explicit stanzas in
# puppet.conf or from dynamic environments created from use of `$environment`
# in puppet.conf.
#
# @example Explicit Stanza
# [environment_name]
# modulepath=/var/my_env/modules
#
# @example Dynamic Environments
# [master]
# modulepath=/var/$environment/modules
#
# @api private
class Legacy
include EnvironmentCreator
# @!macro loader_search_paths
def search_paths
["file://#{Puppet[:config]}"]
end
# @note The list of environments for the Legacy environments is always
# empty.
#
# @!macro loader_list
def list
[]
end
# @note Because the Legacy system cannot list out all of its environments,
# get is able to return environments that are not returned by a call to
# {#list}.
#
# @!macro loader_get
def get(name)
Puppet::Node::Environment.new(name)
end
# @note Because the Legacy system cannot list out all of its environments,
# this method will never fail and is only calling get directly.
#
# @!macro loader_get_or_fail
def get!(name)
get(name)
end
# @note we could return something here, but since legacy environments
# are deprecated, there is no point.
#
# @!macro loader_get_conf
def get_conf(name)
nil
end
end
# Reads environments from a directory on disk. Each environment is
# represented as a sub-directory. The environment's manifest setting is the
# `manifest` directory of the environment directory. The environment's
# modulepath setting is the global modulepath (from the `[master]` section
# for the master) prepended with the `modules` directory of the environment
# directory.
#
# @api private
class Directories
include EnvironmentLoader
def initialize(environment_dir, global_module_path)
@environment_dir = environment_dir
@global_module_path = global_module_path
end
# Generate an array of directory loaders from a path string.
# @param path [String] path to environment directories
# @param global_module_path [Array<String>] the global modulepath setting
# @return [Array<Puppet::Environments::Directories>] An array
# of configured directory loaders.
def self.from_path(path, global_module_path)
environments = path.split(File::PATH_SEPARATOR)
environments.map do |dir|
Puppet::Environments::Directories.new(dir, global_module_path)
end
end
# @!macro loader_search_paths
def search_paths
["file://#{@environment_dir}"]
end
# @!macro loader_list
def list
valid_directories.collect do |envdir|
name = Puppet::FileSystem.basename_string(envdir).intern
create_environment(name)
end
end
# @!macro loader_get
def get(name)
if valid_directory?(File.join(@environment_dir, name.to_s))
create_environment(name)
end
end
# @!macro loader_get_conf
def get_conf(name)
envdir = File.join(@environment_dir, name.to_s)
if valid_directory?(envdir)
return Puppet::Settings::EnvironmentConf.load_from(envdir, @global_module_path)
end
nil
end
private
def create_environment(name, setting_values = nil)
env_symbol = name.intern
setting_values = Puppet.settings.values(env_symbol, Puppet.settings.preferred_run_mode)
env = Puppet::Node::Environment.create(
env_symbol,
Puppet::Node::Environment.split_path(setting_values.interpolate(:modulepath)),
setting_values.interpolate(:manifest),
setting_values.interpolate(:config_version)
)
env.watching = false
env
end
def valid_directory?(envdir)
name = Puppet::FileSystem.basename_string(envdir)
Puppet::FileSystem.directory?(envdir) &&
Puppet::Node::Environment.valid_name?(name)
end
def valid_directories
if Puppet::FileSystem.directory?(@environment_dir)
Puppet::FileSystem.children(@environment_dir).select do |child|
valid_directory?(child)
end
else
[]
end
end
end
# Combine together multiple loaders to act as one.
# @api private
class Combined
include EnvironmentLoader
def initialize(*loaders)
@loaders = loaders
end
# @!macro loader_search_paths
def search_paths
@loaders.collect(&:search_paths).flatten
end
# @!macro loader_list
def list
@loaders.collect(&:list).flatten
end
# @!macro loader_get
def get(name)
@loaders.each do |loader|
if env = loader.get(name)
return env
end
end
nil
end
# @!macro loader_get_conf
def get_conf(name)
@loaders.each do |loader|
if conf = loader.get_conf(name)
return conf
end
end
nil
end
def clear_all
@loaders.each {|loader| loader.clear_all}
end
end
class Cached
include EnvironmentLoader
INFINITY = 1.0 / 0.0
class DefaultCacheExpirationService
def created(env)
end
def expired?(env_name)
false
end
def evicted(env_name)
end
end
def self.cache_expiration_service=(service)
@cache_expiration_service = service
end
def self.cache_expiration_service
@cache_expiration_service || DefaultCacheExpirationService.new
end
# Returns the end of time (the next Mesoamerican Long Count cycle-end after 2012 (5125+2012) = 7137,
# of for a 32 bit machine using Ruby < 1.9.3, the year 2038.
def self.end_of_time
begin
Time.gm(7137)
rescue ArgumentError
Time.gm(2038)
end
end
END_OF_TIME = end_of_time
START_OF_TIME = Time.gm(1)
def initialize(loader)
@loader = loader
@cache_expiration_service = Puppet::Environments::Cached.cache_expiration_service
@cache = {}
# Holds expiration times in sorted order - next to expire is first
@expirations = SortedSet.new
# Infinity since it there are no entries, this is a cache of the first to expire time
@next_expiration = END_OF_TIME
end
# @!macro loader_list
def list
@loader.list
end
# @!macro loader_search_paths
def search_paths
@loader.search_paths
end
# @!macro loader_get
def get(name)
# Aggressively evict all that has expired
# This strategy favors smaller memory footprint over environment
# retrieval time.
clear_all_expired
if result = @cache[name]
# found in cache
return result.value
elsif (result = @loader.get(name))
# environment loaded, cache it
cache_entry = entry(result)
@cache_expiration_service.created(result)
add_entry(name, cache_entry)
result
end
end
# Adds a cache entry to the cache
def add_entry(name, cache_entry)
Puppet.debug("Caching environment '#{name}' #{cache_entry.label}")
@cache[name] = cache_entry
expires = cache_entry.expires
@expirations.add(expires)
if @next_expiration > expires
@next_expiration = expires
end
end
private :add_entry
# Clears the cache of the environment with the given name.
# (The intention is that this could be used from a MANUAL cache eviction command (TBD)
def clear(name)
@cache.delete(name)
end
# Clears all cached environments.
# (The intention is that this could be used from a MANUAL cache eviction command (TBD)
def clear_all()
super
@cache = {}
@expirations.clear
@next_expiration = END_OF_TIME
end
# Clears all environments that have expired, either by exceeding their time to live, or
# through an explicit eviction determined by the cache expiration service.
#
def clear_all_expired()
t = Time.now
return if t < @next_expiration && ! @cache.any? {|name, _| @cache_expiration_service.expired?(name.to_sym) }
to_expire = @cache.select { |name, entry| entry.expires < t || @cache_expiration_service.expired?(name.to_sym) }
to_expire.each do |name, entry|
Puppet.debug("Evicting cache entry for environment '#{name}'")
@cache_expiration_service.evicted(name)
clear(name)
@expirations.delete(entry.expires)
Puppet.settings.clear_environment_settings(name)
end
@next_expiration = @expirations.first || END_OF_TIME
end
# This implementation evicts the cache, and always gets the current
# configuration of the environment
#
# TODO: While this is wasteful since it
# needs to go on a search for the conf, it is too disruptive to optimize
# this.
#
# @!macro loader_get_conf
def get_conf(name)
evict_if_expired(name)
@loader.get_conf(name)
end
# Creates a suitable cache entry given the time to live for one environment
#
def entry(env)
ttl = (conf = get_conf(env.name)) ? conf.environment_timeout : Puppet.settings.value(:environment_timeout)
case ttl
when 0
NotCachedEntry.new(env) # Entry that is always expired (avoids syscall to get time)
when INFINITY
Entry.new(env) # Entry that never expires (avoids syscall to get time)
else
TTLEntry.new(env, ttl)
end
end
# Evicts the entry if it has expired
# Also clears caches in Settings that may prevent the entry from being updated
def evict_if_expired(name)
if (result = @cache[name]) && (result.expired? || @cache_expiration_service.expired?(name))
@cache.delete(name)
@cache_expiration_service.evicted(name)
Puppet.settings.clear_environment_settings(name)
end
end
# Never evicting entry
class Entry
attr_reader :value
def initialize(value)
@value = value
end
def expired?
false
end
def label
""
end
def expires
END_OF_TIME
end
end
# Always evicting entry
class NotCachedEntry < Entry
def expired?
true
end
def label
"(ttl = 0 sec)"
end
def expires
START_OF_TIME
end
end
# Time to Live eviction policy entry
class TTLEntry < Entry
def initialize(value, ttl_seconds)
super value
@ttl = Time.now + ttl_seconds
@ttl_seconds = ttl_seconds
end
def expired?
Time.now > @ttl
end
def label
"(ttl = #{@ttl_seconds} sec)"
end
def expires
@ttl
end
end
end
end