1 files changed, 277 insertions, 0 deletions
diff --git a/chef/lib/chef/client.rb b/chef/lib/chef/client.rb
new file mode 100644
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+++ b/chef/lib/chef/client.rb
@@ -0,0 +1,277 @@
+#
+# Author:: Adam Jacob (<adam@hjksolutions.com>)
+# Copyright:: Copyright (c) 2008 HJK Solutions, LLC
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+# 
+#     http://www.apache.org/licenses/LICENSE-2.0
+# 
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require File.join(File.dirname(__FILE__), "mixin", "params_validate")
+require File.join(File.dirname(__FILE__), "mixin", "generate_url")
+require File.join(File.dirname(__FILE__), "mixin", "checksum")
+
+require 'rubygems'
+require 'facter'
+
+class Chef
+  class Client
+    
+    include Chef::Mixin::GenerateURL
+    include Chef::Mixin::Checksum
+    
+    attr_accessor :node, :registration, :safe_name
+    
+    # Creates a new Chef::Client.
+    def initialize()
+      @node = nil
+      @safe_name = nil
+      @registration = nil
+      @rest = Chef::REST.new(Chef::Config[:registration_url])
+    end
+    
+    # Do a full run for this Chef::Client.  Calls:
+    # 
+    #  * build_node - Get the last known state, merge with local changes
+    #  * register - Make sure we have an openid
+    #  * authenticate - Authenticate with our openid
+    #  * sync_definitions - Populate the local cache with all the definitions
+    #  * sync_recipes - Populate the local cache with all the recipes
+    #  * do_attribute_files - Populate the local cache with all attributes, and execute them
+    #  * save_node - Store the new node configuration
+    #  * converge - Bring this system up to date, based on the local cache
+    #  * save_node - Store the node again, in case convergence altered future state
+    #
+    # === Returns
+    # true:: Always returns true.
+    def run
+      build_node
+      register
+      authenticate
+      sync_definitions
+      sync_recipes
+      do_attribute_files
+      save_node
+      converge
+      save_node
+      true
+    end
+    
+    # Builds a new node object for this client.  Starts with querying for the FQDN of the current
+    # host (unless it is supplied), then merges in the facts from Facter.
+    #
+    # === Parameters
+    # node_name<String>:: The name of the node to build - defaults to nil
+    #
+    # === Returns
+    # node:: Returns the created node object, also stored in @node
+    def build_node(node_name=nil)
+      node_name ||= Facter["fqdn"].value ? Facter["fqdn"].value : Facter["hostname"].value
+      @safe_name = node_name.gsub(/\./, '_')
+      Chef::Log.debug("Building node object for #{@safe_name}")
+      begin
+        @node = @rest.get_rest("nodes/#{@safe_name}")
+      rescue Net::HTTPServerException => e
+        unless e.message =~ /^404/
+          raise e
+        end
+      end
+      unless @node
+        @node ||= Chef::Node.new
+        @node.name(node_name)
+      end
+      Facter.each do |field, value|
+        @node[field] = value
+      end
+      @node
+    end
+    
+    # If this node has been registered before, this method will fetch the current registration
+    # data.
+    #
+    # If it has not, we register it by calling create_registration.
+    #
+    # === Returns
+    # true:: Always returns true
+    def register
+      Chef::Log.debug("Registering #{@safe_name} for an openid") 
+      @registration = nil
+      begin
+        @registration = @rest.get_rest("registrations/#{@safe_name}")
+      rescue Net::HTTPServerException => e
+        unless e.message =~ /^404/
+          raise e
+        end
+      end
+      
+      if @registration
+        reg = Chef::FileStore.load("registration", @safe_name)
+        @secret = reg["secret"]
+      else
+        create_registration
+      end
+      true
+    end
+    
+    # Generates a random secret, stores it in the Chef::Filestore with the "registration" key,
+    # and posts our nodes registration information to the server.
+    #
+    # === Returns
+    # true:: Always returns true
+    def create_registration
+      @secret = random_password(500)
+      Chef::FileStore.store("registration", @safe_name, { "secret" => @secret })
+      @rest.post_rest("registrations", { :id => @safe_name, :password => @secret })
+      true
+    end
+    
+    # Authenticates the node via OpenID.
+    #
+    # === Returns
+    # true:: Always returns true
+    def authenticate
+      Chef::Log.debug("Authenticating #{@safe_name} via openid") 
+      response = @rest.post_rest('openid/consumer/start', { 
+        "openid_identifier" => "#{Chef::Config[:openid_url]}/openid/server/node/#{@safe_name}",
+        "submit" => "Verify"
+      })
+      @rest.post_rest(
+        "#{Chef::Config[:openid_url]}#{response["action"]}",
+        { "password" => @secret }
+      )
+    end
+    
+    # Update the file caches for a given cache segment.  Takes a segment name
+    # and a hash that matches one of the cookbooks/_attribute_files style
+    # remote file listings.
+    #
+    # === Parameters
+    # segment<String>:: The cache segment to update
+    # remote_list<Hash>:: A cookbooks/_attribute_files style remote file listing
+    def update_file_cache(segment, remote_list)  
+      # We need the list of known good attribute files, so we can delete any that are
+      # just laying about.
+      file_canonical = Hash.new
+      
+      remote_list.each do |rf|
+        cache_file = File.join("cookbooks", rf['cookbook'], segment, rf['name'])
+        file_canonical[cache_file] = true
+      
+        current_checksum = nil
+        if Chef::FileCache.has_key?(cache_file)
+          current_checksum = checksum(Chef::FileCache.load(cache_file, false))
+        end
+      
+        rf_url = generate_cookbook_url(
+          rf['name'], 
+          rf['cookbook'], 
+          segment, 
+          @node, 
+          current_checksum ? { 'checksum' => current_checksum } : nil
+        )
+        Chef::Log.debug(rf_url)
+      
+        changed = true
+        begin
+          raw_file = @rest.get_rest(rf_url, true)
+        rescue Net::HTTPRetriableError => e
+          if e.response.kind_of?(Net::HTTPNotModified)
+            changed = false
+            Chef::Log.debug("Cache file #{cache_file} is unchanged")
+          else
+            raise e
+          end
+        end
+      
+        if changed
+          Chef::Log.info("Storing updated #{cache_file} in the cache.")
+          Chef::FileCache.move_to(raw_file.path, cache_file)
+        end
+      end
+      
+      Chef::FileCache.list.each do |cache_file|
+        if cache_file.match("cookbooks/.+?/#{segment}")
+          unless file_canonical[cache_file]
+            Chef::Log.info("Removing #{cache_file} from the cache; it is no longer on the server.")
+            Chef::FileCache.delete(cache_file)
+          end
+        end
+      end
+      
+    end
+    
+    # Gets all the attribute files included in all the cookbooks available on the server,
+    # and executes them.
+    #
+    # === Returns
+    # true:: Always returns true
+    def do_attribute_files
+      Chef::Log.debug("Synchronizing attributes")
+      update_file_cache("attributes", @rest.get_rest('cookbooks/_attribute_files'))
+      Chef::FileCache.list.each do |cache_file|
+        if cache_file.match("cookbooks/.+?/attributes")
+          Chef::Log.debug("Executing #{cache_file}")
+          @node.from_file(Chef::FileCache.load(cache_file, false))
+        end
+      end
+      true
+    end
+    
+    def sync_definitions
+      Chef::Log.debug("Synchronizing definitions") 
+      update_file_cache("definitions", @rest.get_rest('cookbooks/_definition_files'))
+    end
+    
+    def sync_recipes
+      Chef::Log.debug("Synchronizing attributes") 
+      update_file_cache("recipes", @rest.get_rest('cookbooks/_recipe_files'))
+    end
+    
+    # Updates the current node configuration on the server.
+    #
+    # === Returns
+    # true:: Always returns true
+    def save_node
+      Chef::Log.debug("Saving the current state of node #{@safe_name}")
+      @node = @rest.put_rest("nodes/#{@safe_name}", @node)
+      true
+    end
+    
+    # Compiles the full list of recipes for the server, and passes it to an instance of
+    # Chef::Runner.converge.
+    #
+    # === Returns
+    # true:: Always returns true
+    def converge
+      Chef::Log.debug("Compiling recipes for node #{@safe_name}")
+      Chef::Config[:cookbook_path] = File.join(Chef::Config[:file_cache_path], "cookbooks")
+      compile = Chef::Compile.new()
+      compile.node = @node
+      compile.load_definitions
+      compile.load_recipes
+
+      Chef::Log.debug("Executing recipes for node #{@safe_name}")
+      cr = Chef::Runner.new(@node, compile.collection)
+      cr.converge
+      true
+    end
+    
+    protected
+      # Generates a random password of "len" length.
+      def random_password(len)
+        chars = ("a".."z").to_a + ("A".."Z").to_a + ("0".."9").to_a
+        newpass = ""
+        1.upto(len) { |i| newpass << chars[rand(chars.size-1)] }
+        newpass
+      end
+
+  end
+end