Notifable handlers only run when something is changed. Awesome.
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Michael DeHaan
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commit
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3 changed files with 46 additions and 65 deletions
36
TODO.md
36
TODO.md
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@ -1,36 +0,0 @@
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TODO list and plans
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===================
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Playbook TODO:
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* error codes and failure summaries
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* handle 'changed' attributes
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* fail nodes on errors, i.e. remove from host list, rather than continuing to pound them
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* further improve output
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* more conditional capability (if statement) (?)
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* very good logging
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Command module:
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* magic to pull async & timeout options off of the command line and not feed them
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to the app we're executing
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General:
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* better logging
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* async options
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* modules for users, groups, and files, using puppet style ensure mechanics
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* think about how to build idempotency (aka Puppet-style 'creates') around command module?
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Bonus utilities:
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* ansible-inventory - gathering fact/hw info, storing in git, adding RSS
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* ansible-slurp - recursively rsync file trees for each host
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* maybe it's own fact engine, not required, that also feeds from facter
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Not so interested really, but maybe:
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* list available modules from command line
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* add/remove/list hosts from the command line
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* filter exclusion (run this only if fact is true/false)
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-- should be doable with playbooks (i.e. not neccessary)
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@ -6,17 +6,18 @@
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- do:
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- copy a file
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- copy /srv/a /srv/b
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notify:
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- restart apache
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- do:
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- template from local file template.j2 to remote location /srv/file.out
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- template /srv/template.j2 /srv/file.out
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- do:
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- update apache
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- command /usr/bin/yum update apache
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onchange:
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notify:
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- restart apache
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- quack like a duck
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handlers:
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- do:
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- restart apache
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- command /sbin/service apache restart
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- command /sbin/service httpd restart
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- do:
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- run bin false
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- command /bin/false
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- quack like a duck
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- command /bin/true
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@ -101,7 +101,7 @@ class PlayBook(object):
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timeout=self.timeout
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)
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def _run_task(self, pattern, task, host_list=None, conditional=False):
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def _run_task(self, pattern=None, task=None, host_list=None, handlers=None, conditional=False):
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'''
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run a single task in the playbook and
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recursively run any subtasks.
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@ -118,7 +118,7 @@ class PlayBook(object):
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namestr = "%s/%s" % (pattern, comment)
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if conditional:
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namestr = "subset/%s" % namestr
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namestr = "notified/%s" % namestr
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print "TASK [%s]" % namestr
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runner = self._get_task_runner(
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@ -130,15 +130,7 @@ class PlayBook(object):
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results = runner.run()
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dark = results.get("dark", [])
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contacted = results.get("contacted", [])
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# TODO: filter based on values that indicate
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# they have changed events to emulate Puppet
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# 'notify' behavior, super easy -- just
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# a list comprehension -- but we need complaint
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# modules first
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ok_hosts = contacted.keys()
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for host, msg in dark.items():
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@ -152,27 +144,51 @@ class PlayBook(object):
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print "FAIL: [%s/%s]" % (host, comment, results)
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subtasks = task.get('onchange', [])
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# flag which notify handlers need to be run
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subtasks = task.get('notify', [])
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if len(subtasks) > 0:
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for subtask in subtasks:
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self._run_task(pattern, subtask, ok_hosts, conditional=True)
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for host, results in contacted.items():
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if results.get('changed', False):
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for subtask in subtasks:
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self._flag_handler(handlers, subtask, host)
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# TODO: if a host fails in task 1, add it to an excludes
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# list such that no other tasks in the list ever execute
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# unlike Puppet, do not allow partial failure of the tree
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# and continuing as far as possible. Fail fast.
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# TODO: if a host fails in any task, remove it from
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# the host list immediately
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def _flag_handler(self, handlers, match_name, host):
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'''
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if a task has any notify elements, flag handlers for run
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at end of execution cycle for hosts that have indicated
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changes have been made
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'''
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for x in handlers:
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attribs = x["do"]
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name = attribs[0]
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if match_name == name:
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if not x.has_key("run"):
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x['run'] = []
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x['run'].append(host)
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def _run_pattern(self, pg):
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'''
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run a list of tasks for a given pattern, in order
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'''
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pattern = pg['pattern']
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tasks = pg['tasks']
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pattern = pg['pattern']
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tasks = pg['tasks']
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handlers = pg['handlers']
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for task in tasks:
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self._run_task(pattern, task)
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self._run_task(pattern=pattern, task=task, handlers=handlers)
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for task in handlers:
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if type(task.get("run", None)) == list:
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self._run_task(
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pattern=pattern,
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task=task,
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handlers=handlers,
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host_list=task.get('run',[]),
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conditional=True
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)
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