5 # this class is now used purely for upgrading from prior versions of rbot
6 # the new registry is split into multiple DBHash objects, one per plugin
14 # check for older versions of rbot with data formats that require updating
15 # NB this function is called _early_ in init(), pretty much all you have to
16 # work with is @bot.botclass.
18 if File.exist?("#{@bot.botclass}/registry.db")
19 log "upgrading old-style (rbot 0.9.5 or earlier) plugin registry to new format"
20 old = BDB::Hash.open("#{@bot.botclass}/registry.db", nil,
22 new = BDB::CIBtree.open("#{@bot.botclass}/plugin_registry.db", nil,
23 BDB::CREATE | BDB::EXCL,
30 File.delete("#{@bot.botclass}/registry.db")
35 if File.exist?("#{@bot.botclass}/plugin_registry.db")
36 Dir.mkdir("#{@bot.botclass}/registry") unless File.exist?("#{@bot.botclass}/registry")
37 env = BDB::Env.open("#{@bot.botclass}", BDB::INIT_TRANSACTION | BDB::CREATE | BDB::RECOVER)
39 log "upgrading previous (rbot 0.9.9 or earlier) plugin registry to new split format"
40 old = BDB::CIBtree.open("#{@bot.botclass}/plugin_registry.db", nil,
41 "r+", 0600, "env" => env)
43 prefix,key = k.split("/", 2)
45 # subregistries were split with a +, now they are in separate folders
46 if prefix.gsub!(/\+/, "/")
47 # Ok, this code needs to be put in the db opening routines
48 dirs = File.dirname("#{@bot.botclass}/registry/#{prefix}.db").split("/")
49 dirs.length.times { |i|
50 dir = dirs[0,i+1].join("/")+"/"
51 unless File.exist?(dir)
52 log "creating subregistry directory #{dir}"
57 unless dbs.has_key?(prefix)
58 log "creating db #{@bot.botclass}/registry/#{prefix}.db"
59 dbs[prefix] = BDB::CIBtree.open("#{@bot.botclass}/registry/#{prefix}.db",
60 nil, BDB::CREATE | BDB::EXCL,
66 File.rename("#{@bot.botclass}/plugin_registry.db", "#{@bot.botclass}/plugin_registry.db.old")
77 # This class provides persistent storage for plugins via a hash interface.
78 # The default mode is an object store, so you can store ruby objects and
79 # reference them with hash keys. This is because the default store/restore
80 # methods of the plugins' RegistryAccessor are calls to Marshal.dump and
85 # @registry[:blah] = blah
86 # then, even after the bot is shut down and disconnected, on the next run you
87 # can access the blah object as it was, with:
88 # blah = @registry[:blah]
89 # The registry can of course be used to store simple strings, fixnums, etc as
90 # well, and should be useful to store or cache plugin data or dynamic plugin
94 # in object store mode, don't make the mistake of treating it like a live
95 # object, e.g. (using the example above)
96 # @registry[:blah][:foo] = "flump"
97 # will NOT modify the object in the registry - remember that BotRegistry#[]
98 # returns a Marshal.restore'd object, the object you just modified in place
99 # will disappear. You would need to:
100 # blah = @registry[:blah]
101 # blah[:foo] = "flump"
102 # @registry[:blah] = blah
104 # If you don't need to store objects, and strictly want a persistant hash of
105 # strings, you can override the store/restore methods to suit your needs, for
106 # example (in your plugin):
117 # Your plugins section of the registry is private, it has its own namespace
118 # (derived from the plugin's class name, so change it and lose your data).
119 # Calls to registry.each etc, will only iterate over your namespace.
120 class BotRegistryAccessor
121 # plugins don't call this - a BotRegistryAccessor is created for them and
122 # is accessible via @registry.
123 def initialize(bot, name)
125 @name = name.downcase
126 dirs = File.dirname("#{@bot.botclass}/registry/#{@name}").split("/")
127 dirs.length.times { |i|
128 dir = dirs[0,i+1].join("/")+"/"
129 unless File.exist?(dir)
130 debug "creating subregistry directory #{dir}"
134 @registry = DBTree.new bot, "registry/#{@name}"
136 # debug "initializing registry accessor with name #{@name}"
148 # convert value to string form for storing in the registry
149 # defaults to Marshal.dump(val) but you can override this in your module's
150 # registry object to use any method you like.
151 # For example, if you always just handle strings use:
159 # restores object from string form, restore(store(val)) must return val.
160 # If you override store, you should override restore to reverse the
162 # For example, if you always just handle strings use:
169 rescue Exception => e
170 warning "failed to restore marshal data for #{val.inspect}, falling back to default"
172 debug e.backtrace.join("\n")
175 return Marshal.restore(@default)
185 # lookup a key in the registry
187 if @registry.has_key?(key)
188 return restore(@registry[key])
189 elsif @default != nil
190 return restore(@default)
196 # set a key in the registry
198 @registry[key] = store(value)
201 # set the default value for registry lookups, if the key sought is not
202 # found, the default will be returned. The default default (har) is nil.
203 def set_default (default)
204 @default = store(default)
207 # just like Hash#each
209 @registry.each {|key,value|
210 block.call(key, restore(value))
214 # just like Hash#each_key
216 @registry.each {|key, value|
221 # just like Hash#each_value
222 def each_value(&block)
223 @registry.each {|key, value|
224 block.call(restore(value))
228 # just like Hash#has_key?
230 return @registry.has_key?(key)
232 alias include? has_key?
233 alias member? has_key?
235 # just like Hash#has_both?
236 def has_both?(key, value)
237 return @registry.has_both?(key, store(value))
240 # just like Hash#has_value?
241 def has_value?(value)
242 return @registry.has_value?(store(value))
245 # just like Hash#index?
247 ind = @registry.index(store(value))
255 # delete a key from the registry
257 return @registry.delete(key)
260 # returns a list of your keys
262 return @registry.keys
265 # Return an array of all associations [key, value] in your namespace
268 @registry.each {|key, value|
269 ret << [key, restore(value)]
274 # Return an hash of all associations {key => value} in your namespace
277 @registry.each {|key, value|
278 ret[key] = restore(value)
283 # empties the registry (restricted to your namespace)
289 # returns an array of the values in your namespace of the registry
298 def sub_registry(prefix)
299 return BotRegistryAccessor.new(@bot, @name + "/" + prefix)
302 # returns the number of keys in your registry namespace