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|
module Oxidized
class HookManager
class << self
def from_config cfg
mgr = new
cfg.hooks.each do |name,h_cfg|
h_cfg.events.each do |event|
mgr.register event.to_sym, name, h_cfg.type, h_cfg
end
end
mgr
end
end
# HookContext is passed to each hook. It can contain anything related to the
# event in question. At least it contains the event name
class HookContext < OpenStruct; end
# RegisteredHook is a container for a Hook instance
class RegisteredHook < Struct.new(:name, :hook); end
Events = [
:node_success,
:node_fail,
:post_store,
]
attr_reader :registered_hooks
def initialize
@registered_hooks = Hash.new {|h,k| h[k] = []}
end
def register event, name, hook_type, cfg
unless Events.include? event
raise ArgumentError,
"unknown event #{event}, available: #{Events.join ','}"
end
Oxidized.mgr.add_hook hook_type
begin
hook = Oxidized.mgr.hook.fetch(hook_type).new
rescue KeyError
raise KeyError, "cannot find hook #{hook_type.inspect}"
end
hook.cfg = cfg
@registered_hooks[event] << RegisteredHook.new(name, hook)
Log.debug "Hook #{name.inspect} registered #{hook.class} for event #{event.inspect}"
end
def handle event, ctx_params={}
ctx = HookContext.new ctx_params
ctx.event = event
@registered_hooks[event].each do |r_hook|
begin
r_hook.hook.run_hook ctx
rescue => e
Log.error "Hook #{r_hook.name} (#{r_hook.hook}) failed " +
"(#{e.inspect}) for event #{event.inspect}"
end
end
end
end
# Hook abstract base class
class Hook
attr_reader :cfg
def initialize
end
def cfg=(cfg)
@cfg = cfg
validate_cfg! if self.respond_to? :validate_cfg!
end
def run_hook ctx
raise NotImplementedError
end
def log(msg, level=:info)
Log.send(level, "#{self.class.name}: #{msg}")
end
end
end
|
