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|
# The interepreter's job is to convert from a parsed file to the configuration
# for a given client. It really doesn't do any work on its own, it just collects
# and calls out to other objects.
require 'puppet'
require 'puppet/parser/parser'
require 'puppet/parser/scope'
module Puppet
module Parser
class Interpreter
attr_accessor :ast
# just shorten the constant path a bit, using what amounts to an alias
AST = Puppet::Parser::AST
# create our interpreter
def initialize(hash)
unless hash.include?(:Manifest)
raise Puppet::DevError, "Interpreter was not passed a manifest"
end
@file = hash[:Manifest]
if hash.include?(:UseNodes)
@usenodes = hash[:UseNodes]
else
@usenodes = true
end
# Set it to either the value or nil. This is currently only used
# by the cfengine module.
@classes = hash[:Classes] || []
# Create our parser object
parsefiles
evaluate
end
# evaluate our whole tree
def run(client, facts)
parsefiles()
# Really, we should stick multiple names in here
# but for now just make a simple array
names = [client]
# if the client name is fully qualied (which is normally will be)
# add the short name
if client =~ /\./
names << client.sub(/\..+/,'')
end
begin
if @usenodes
unless client
raise Puppet::Error,
"Cannot evaluate nodes with a nil client"
end
# We've already evaluated the AST, in this case
retval = @scope.evalnode(names, facts)
if classes = @scope.classlist
retval.classes = classes
end
return retval
else
# We've already evaluated the AST, in this case
@scope = Puppet::Parser::Scope.new() # no parent scope
@scope.interp = self
@scope.type = "puppet"
@scope.name = "top"
retval = @scope.evaluate(@ast, facts, @classes)
if classes = @scope.classlist
retval.classes = classes + @classes
end
return retval
end
#@ast.evaluate(@scope)
rescue Puppet::DevError, Puppet::Error, Puppet::ParseError => except
#Puppet.err "File %s, line %s: %s" %
# [except.file, except.line, except.message]
if Puppet[:debug]
puts except.backtrace
end
#exit(1)
raise
rescue => except
error = Puppet::DevError.new("%s: %s" %
[except.class, except.message])
if Puppet[:debug]
puts except.backtrace
end
raise error
end
end
def scope
return @scope
end
private
# Evaluate the configuration. If there aren't any nodes defined, then
# this doesn't actually do anything, because we have to evaluate the
# entire configuration each time we get a connect.
def evaluate
# FIXME When this produces errors, it should specify which
# node caused those errors.
if @usenodes
@scope = Puppet::Parser::Scope.new() # no parent scope
@scope.name = "top"
@scope.type = "puppet"
@scope.interp = self
Puppet.debug "Nodes defined"
@ast.safeevaluate(@scope)
else
Puppet.debug "No nodes defined"
return
end
end
def parsefiles
if defined? @parser
unless @parser.reparse?
return false
end
end
unless FileTest.exists?(@file)
if @ast
Puppet.warning "Manifest %s has disappeared" % @file
return
else
raise Puppet::Error, "Manifest %s must exist" % @file
end
end
if defined? @parser
Puppet.info "Reloading files"
end
# should i be creating a new parser each time...?
@parser = Puppet::Parser::Parser.new()
@parser.file = @file
@ast = @parser.parse
# Reevaluate the config. This is what actually replaces the
# existing scope.
evaluate
end
end
end
end
# $Id$
|
