testnode: move code from slapos.toolbox to testnode for communication with SlapOS master

- The base of this code comes from some work done by Rafael in here:
    https://lab.nexedi.com/nexedi/slapos.toolbox/blob/master/slapos/agent/tester.py
- Refactor in communication with slap objects for supply and request.
- Added method to check if instance is requested.
- Refactor in log calls.

erp5/util/testnode/SlapOSMasterCommunicator.py

+import datetime
 import json
-import httplib
-import urlparse
+import sys
+import traceback
 import time
+#import feedparser
+from uritemplate import expand
 
-TIMEOUT = 30
+import slapos.slap
+from slapos.slap import SoftwareProductCollection
+
+from slapos.slap.slap import ConnectionError
+from requests.exceptions import HTTPError
+from erp5.util.taskdistribution import SAFE_RPC_EXCEPTION_LIST
+
+
+SOFTWARE_PRODUCT_NAMESPACE = "product."
+
+
+SOFTWARE_STATE_UNKNOWN = "SOFTWARE_STATE_UNKNOWN"
+SOFTWARE_STATE_INSTALLING = "SOFTWARE_STATE_INSTALLING"
+SOFTWARE_STATE_INSTALLED = "SOFTWARE_STATE_INSTALLED"
+SOFTWARE_STATE_DESTROYING = "SOFTWARE_STATE_DESTROYING"
+
+INSTANCE_STATE_UNKNOWN = "INSTANCE_STATE_UNKNOWN"
+INSTANCE_STATE_STARTING = "INSTANCE_STATE_STARTING"
+INSTANCE_STATE_STARTED = "started"
+INSTANCE_STATE_STARTED_WITH_ERROR = "INSTANCE_STATE_STARTED_WITH_ERROR"
+INSTANCE_STATE_STOPPING = "INSTANCE_STATE_STOPPING"
+INSTANCE_STATE_STOPPED = "stopped"
+INSTANCE_STATE_DESTROYING = "INSTANCE_STATE_DESTROYING"
+
+TESTER_STATE_INITIAL = "TESTER_STATE_INITIAL"
+TESTER_STATE_NOTHING = "TESTER_STATE_NOTHING"
+TESTER_STATE_SOFTWARE_INSTALLED = "TESTER_STATE_SOFTWARE_INSTALLED"
+TESTER_STATE_INSTANCE_INSTALLED = "TESTER_STATE_INSTANCE_INSTALLED"
+TESTER_STATE_INSTANCE_STARTED = "TESTER_STATE_INSTANCE_STARTED"
+TESTER_STATE_INSTANCE_UNINSTALLED = "TESTER_STATE_INSTANCE_UNINSTALLED"
+
+
+# Simple decorator to prevent raise due small
+# network failures.
+def retryOnNetworkFailure(func):
+  def wrapper(*args, **kwargs):
+    retry_time = 64
+    while True:
+      try:
+        return func(*args, **kwargs)
+      except SAFE_RPC_EXCEPTION_LIST, e:
+        print 'Network failure: %s , %s' % (sys.exc_info(), e)
+      except HTTPError, e:
+        print 'Network failure: %s , %s' % (sys.exc_info(), e)
+      except ConnectionError, e:
+        print 'Network failure: %s , %s' % (sys.exc_info(), e)
+      except slapos.slap.ConnectionError, e:
+        print 'Network failure: %s , %s' % (sys.exc_info(), e)
+
+      print 'Retry method %s in %i seconds' % (func, retry_time)
+      time.sleep(retry_time)
+      retry_time = min(retry_time*1.5, 640)
+
+
+  wrapper.__name__ = func.__name__
+  wrapper.__doc__ = func.__doc__
+  return wrapper
 
-# TODO: News-> look list to get last news... (and not the first of the list)
 
 class SlapOSMasterCommunicator(object):
-  """
-  Communication with slapos Master using Hateoas.
-  
-  collection: collection of data (hosting_subscription, instance, software_release...)
-  hosting_subscription: result of a request
-  instance(s): instance(s) related to an hosting_subscription
-
-  usage: ex:
-    # Try to reuse same communicator, because initilization step may takes a lot of time
-    # due to listing of all instances (alive or not) related to the specified slapOS account.
-    communicator = SlapOSMasterCommunicator()
+
+
+  def __init__(self, slap, slap_supply, slap_order, url, logger ):
+
+    self._logger = logger
+    self.slap = slap
+    self.slap_order = slap_order
+    self.slap_supply = slap_supply
+    self.hateoas_navigator = self.slap._hateoas_navigator
+    self.hosting_subscription_url = None
+
+    if url is not None and \
+      url.startswith(SOFTWARE_PRODUCT_NAMESPACE):
+
+      product = SoftwareProductCollection(self._logger, self.slap)
+      try:
+        url = product.__getattr__(url[len(SOFTWARE_PRODUCT_NAMESPACE):])
+      except AttributeError as e:
+        self._logger.warning('Error on get software release : %s ' % e.message)
+
+    self.url = url  
+
+  @retryOnNetworkFailure
+  def _supply(self):
+    if self.computer_guid is None:
+      self._logger ('Nothing to supply for %s.' % (self.name))
+      return None
+    self._logger('Supply %s@%s', self.url, self.computer_guid)
+    return self.slap_supply.supply(self.url, self.computer_guid)
+
+  @retryOnNetworkFailure
+  def _request(self, state, instance_title=None, request_kw=None):
+    if instance_title is not None:
+      self.name = instance_title 
+    if request_kw is not None:
+      if isinstance(request_kw, str) or \
+        isinstance(request_kw, unicode):
+        self.request_kw = json.loads(request_kw)
+      else:
+        self.request_kw = request_kw
+    self._logger('Request %s@%s: %s', self.url, self.name, state)
+    self.latest_state = state
+    return self.slap_order.request(
+            software_release=self.url,
+            partition_reference=self.name,
+            state=state,
+            **self.request_kw)
+
+  def isInstanceRequested(self, instance_title):
+    hateoas = getattr(self.slap, '_hateoas_navigator', None)
+    return instance_title in hateoas.getHostingSubscriptionDict()
+
+  @retryOnNetworkFailure
+  def _hateoas_getComputer(self, reference):
+
+    root_document = self.hateoas_navigator.getRootDocument()
+    search_url = root_document["_links"]['raw_search']['href']
+
+    getter_link = expand(search_url, { 
+      "query": "reference:%s AND portal_type:Computer" % reference, 
+      "select_list": ["relative_url"],
+      "limit": 1})
+
+    result = self.hateoas_navigator.GET(getter_link)
+    content_list = json.loads(result)['_embedded']['contents']
+
+    if len(content_list) == 0:
+      raise Exception('No Computer found.')
+
+    computer_relative_url = content_list[0]["relative_url"]
     
-    # Print news related to 'TestScalability_21423104630420' all instances
-    instance_link_list =  communicator._getRelatedInstanceLink('TestScalability_21423104630420')
-    for instance_link in instance_link_list:
-      news = communicator.getNewsFromInstanceLink(instance_link)
-      print news['news']
-  """
-  def __init__(self, certificate_path, key_path, log,
-                     url):
-    # Create connection
-    api_scheme, api_netloc, api_path, api_query, api_fragment = urlparse.urlsplit(url)
-    self.log = log
-    self.certificate_path = certificate_path
-    self.key_path = key_path
-    self.url = url
-    self.connection = self._getConnection(self.certificate_path, self.key_path, self.url)
-    # Get master
-    master_link = {'href':api_path,'type':"application/vnd.slapos.org.hal+json; class=slapos.org.master"}
-    master = self._curl(master_link)
-    self.person_link = master['_links']['http://slapos.org/reg/me']
-    # Get person related to specified key/certificate provided
-    person = self._curl(self.person_link)
-    self.personnal_collection_link = person['_links']['http://slapos.org/reg/hosting_subscription']
-    # Get collection (of hosting subscriptions)
-    collection = self._curl(self.personnal_collection_link)
-    # XXX: This part may be extremly long (because here no hosting subscriptions
-    # has been visited)
-    self.hosting_subcriptions_dict = {}
-    self.visited_hosting_subcriptions_link_list = []
-    self.log("SlapOSMasterCommunicator will read all hosting subscriptions entries, "
-             "it may take several time...")
-    self._update_hosting_subscription_informations()
+    getter_url = self.hateoas_navigator.getDocumentAndHateoas(
+      computer_relative_url)
+
+    return json.loads(self.hateoas_navigator.GET(getter_url))
     
-  def _getConnection(self,certificate_path, key_path, url):
-    api_scheme, api_netloc, api_path, api_query, api_fragment = urlparse.urlsplit(url)
-    #self.log("HTTPS Connection with: %s, cert=%s, key=%s" %(api_netloc,key_path,certificate_path))
-    return httplib.HTTPSConnection(api_netloc, key_file=key_path, cert_file=certificate_path, timeout=TIMEOUT)
+ 
+  @retryOnNetworkFailure
+  def getSoftwareInstallationList(self):
+    # XXX Move me to slap.py API 
 
-  def _curl(self, link):
-    """
-    'link' must look like : {'href':url,'type':content_type}
-    """
-    # Set timeout
-    import socket
-    socket.setdefaulttimeout(1.0*TIMEOUT)
+    computer = self._hateoas_getComputer(self.computer_guid)
+
+    # Not a list ?
+    action = computer['_links']['action_object_slap']
+
+    if action.get('title') == 'getHateoasSoftwareInstallationList':
+      getter_link = action['href']
+    else:
+      raise Exception('No Link found found.')
+
+    result = self.hateoas_navigator.GET(getter_link)
+    return json.loads(result)['_links']['content']
+
+
+  @retryOnNetworkFailure
+  def getSoftwareInstallationNews(self):
+    getter_link = None
+    for si in self.getSoftwareInstallationList():
+      if si["title"] == self.url:
+        getter_link = si["href"]
+        break
+
+    # We could not find the document, so it is probably too soon.
+    if getter_link is None:
+      return ""
+    
+    result = self.hateoas_navigator.GET(getter_link)
+    action_object_slap_list = json.loads(result)['_links']['action_object_slap']
+
+    for action in action_object_slap_list:
+      if action.get('title') == 'getHateoasNews':
+        getter_link = action['href']
+        break
+    else:
+      raise Exception('getHateoasNews not found.')
+
+    result = self.hateoas_navigator.GET(getter_link)
+    if len(json.loads(result)['news']) > 0:
+      return json.loads(result)['news'][0]["text"]
+    return ""
+
+  @retryOnNetworkFailure
+  def getInstanceUrlList(self):
+
+    if self.hosting_subscription_url is None:
+      hosting_subscription_dict = self.hateoas_navigator._hateoas_getHostingSubscriptionDict()
+      for hs in hosting_subscription_dict:
+        if hs['title'] == self.name:
+          self.hosting_subscription_url = hs['href'] 
+          break 
+
+    if self.hosting_subscription_url is None:
+      return None
+
+    return self.hateoas_navigator.getHateoasInstanceList(
+            self.hosting_subscription_url)
+
+  @retryOnNetworkFailure
+  def getNewsFromInstance(self, url):
+
+    result = self.hateoas_navigator.GET(url)
+    result = json.loads(result)
+    if result['_links'].get('action_object_slap', None) is None:
+      return None
+
+    object_link = self.hateoas_navigator.hateoasGetLinkFromLinks(
+       result['_links']['action_object_slap'], 'getHateoasNews')
     
-    api_scheme, api_netloc, api_path, api_query, api_fragment = urlparse.urlsplit(link['href'])
-    max_retry = 10
-    # Try to use existing conection
+    result = self.hateoas_navigator.GET(object_link)
+    return json.loads(result)['news']
+
+  @retryOnNetworkFailure
+  def getInformationFromInstance(self, url):
+
+    result = self.hateoas_navigator.GET(url)
+    result = json.loads(result)
+    if result['_links'].get('action_object_slap', None) is None:
+      print result['links']
+      return None
+
+    object_link = self.hateoas_navigator.hateoasGetLinkFromLinks(
+       result['_links']['action_object_slap'], 'getHateoasInformation')
+
+    result = self.hateoas_navigator.GET(object_link)
+    return json.loads(result) 
+
+
+class SoftwareReleaseTester(SlapOSMasterCommunicator):
+  deadline = None
+  latest_state = None
+
+  def __init__(self,
+              name,
+              logger,
+              slap,
+              slap_order,
+              slap_supply,
+              url, # software release url
+              computer_guid=None, # computer for supply if desired
+              request_kw=None, # instance parameters, if instantiation
+                               # testing is desired
+              software_timeout=3600,
+              instance_timeout=3600,
+          ):
+
+    super(SoftwareReleaseTester, self).__init__( 
+      slap, slap_supply, slap_order, url, logger) 
+
+    self.name = name
+    self.computer_guid = computer_guid
+
+    if isinstance(request_kw, str) or \
+      isinstance(request_kw, unicode):
+      self.request_kw = json.loads(request_kw)
+    else:
+      self.request_kw = request_kw
+    self.message_history = []
+ 
+    self.state = TESTER_STATE_INITIAL
+    self.transition_dict = {
+      # step function
+      # delay
+      # next_state
+      # software_state
+      # instance_state
+      TESTER_STATE_INITIAL: (
+        lambda t: None,
+        None,
+        TESTER_STATE_NOTHING,
+        None,
+        None,
+      ),
+      TESTER_STATE_NOTHING: (
+        lambda t: t._supply("available"),
+        int(software_timeout),
+        request_kw is None and TESTER_STATE_INSTANCE_UNINSTALLED or \
+            TESTER_STATE_SOFTWARE_INSTALLED,
+        SOFTWARE_STATE_INSTALLED,
+        None,
+      ),
+      TESTER_STATE_SOFTWARE_INSTALLED: (
+        lambda t: t._request("started"),
+        int(instance_timeout),
+        TESTER_STATE_INSTANCE_STARTED,
+        None,
+        INSTANCE_STATE_STARTED,
+      ),
+      TESTER_STATE_INSTANCE_STARTED: (
+        lambda t: t._request("destroyed"),
+        int(1200),
+        TESTER_STATE_INSTANCE_UNINSTALLED,
+        None,
+        INSTANCE_STATE_STOPPED,
+      ),
+      TESTER_STATE_INSTANCE_UNINSTALLED: (
+        lambda t: t._supply("destroyed"),
+        int(1200),
+        None,
+        None,
+        None,
+      ),
+     }
+
+  def __repr__(self):
+      deadline = self.deadline
+      if deadline is not None:
+          deadline -= time.time()
+          deadline = '+%is' % (deadline, )
+      return '<%s(state=%s, deadline=%s) at %x>' % (
+          self.__class__.__name__, self.state, deadline, id(self))
+
+  def getInfo(self):
+    info = ""
+    info += "Software Release URL: %s\n" % (self.url)
+    if self.computer_guid is not None:
+      info += "Supply requested on: %s\n" % (self.computer_guid)
+    info += "Instance Requested (Parameters): %s\n" % self.request_kw
+    return info
+
+  def getFormatedLastMessage(self):
+    if len(self.message_history) == 0:
+      return "No message"
+
+    summary = "Summary about the test. Instance List and Status:\n"
+    message = "Last information about the tester:\n"
+    if self.message_history[-1] is not None:
+      message_list = self.message_history[-1]
+      for entry in message_list:
+        summary += "%s %s -> %s\n" % (
+          entry['title'], entry["slave"] and "(slave)" or "", entry['state'])
+        for prop in entry:
+          if prop != "information":
+            message += "%s = %s\n" % (prop, json.dumps(entry[prop], indent=2))
+          
+        message += "=== connection_dict === \n%s\n" % (
+          json.dumps(entry["information"]["connection_dict"], indent=2))
+        message += "\n"
+        message += "=== parameter_dict === \n%s\n" % (
+          json.dumps(entry["information"]["parameter_dict"], indent=2))
+        message += "\n"
+      message += "="*79
+      message += "\n\n\n"
+ 
+    return summary + message
+
+  def _getSoftwareState(self):
+    if self.computer_guid is None:
+      return SOFTWARE_STATE_INSTALLED
+
+    message = self.getSoftwareInstallationNews()
+    if message.startswith("#error no data found"):
+      return SOFTWARE_STATE_UNKNOWN
+
+    if message.startswith('#access software release'):
+      return SOFTWARE_STATE_INSTALLED
+
+    if message.startswith('#error'):
+      return SOFTWARE_STATE_INSTALLING
+
+    return SOFTWARE_STATE_UNKNOWN 
+
+  @retryOnNetworkFailure
+  def getRSSEntryFromMonitoring(self, base_url):
+    if base_url is None:
+      return {}
+
+    feed_url = base_url + '/monitor-public/rssfeed.html'
+    d = feedparser.parse(feed_url) 
+    
+    if len(d.entries) > 0:
+      return {"date": d.entries[0].published, 
+              "message": d.entries[0].description, 
+              "title" : d.entries[0].title}
+        
+    return {}
+
+  @retryOnNetworkFailure
+  def _getInstanceState(self):
+    latest_state = self.latest_state
+    self._logger('latest_state = %r', latest_state)
+
+    if latest_state is None:
+      return INSTANCE_STATE_UNKNOWN
+
+    message_list = [] 
     try:
-      self.connection.request(method='GET', url=api_path, headers={'Accept': link['type']}, body="")
-      response = self.connection.getresponse()
-      return json.loads(response.read())
-    # Create and use new connection
+      for instance in self.getInstanceUrlList():
+        news = self.getNewsFromInstance(instance["href"])
+        information = self.getInformationFromInstance(instance["href"])
+        state = INSTANCE_STATE_UNKNOWN
+        monitor_information_dict = {}
+
+        info_created_at = "-1"
+        is_slave = information['slave']
+        if is_slave:
+          if (information["connection_dict"]) > 0:
+            state =  INSTANCE_STATE_STARTED
+        else:
+          # not slave
+          instance_state = news[0]
+          if instance_state.get('created_at', '-1') != "-1":
+            # the following does NOT take TZ into account
+            created_at = datetime.datetime.strptime(instance_state['created_at'], 
+              '%a, %d %b %Y %H:%M:%S %Z')
+            gmt_now = datetime.datetime(*time.gmtime()[:6])
+
+            info_created_at = '%s (%d)' % (
+               instance_state['created_at'], (gmt_now - created_at).seconds)
+
+            if instance_state['text'].startswith('#access'):
+              state =  INSTANCE_STATE_STARTED
+
+            if instance_state['text'].startswith('#access Instance correctly stopped'):
+              state =  INSTANCE_STATE_STOPPED
+
+            if instance_state['text'].startswith('#error'):
+              state = INSTANCE_STATE_STARTED_WITH_ERROR
+
+        if state == INSTANCE_STATE_STARTED_WITH_ERROR:
+          # search for monitor url
+          monitor_v6_url = information["connection_dict"].get("monitor_v6_url")
+          try:
+            monitor_information_dict = self.getRSSEntryFromMonitoring(monitor_v6_url)
+          except Exception:
+            self._logger ('Unable to download promises for: %s' % (instance["title"]))
+            self._logger (traceback.format_exc())
+            monitor_information_dict = {"message": "Unable to download"}
+
+        message_list.append({
+          'title': instance["title"],
+          'slave': is_slave,
+          'news': news[0],
+          'information': information,
+          'monitor': monitor_information_dict,
+          'state': state
+        })
+
+    except slapos.slap.ServerError:
+      self._logger ('Got an error requesting partition for '
+            'its state')
+      return INSTANCE_STATE_UNKNOWN
     except:
-      retry = 0
-      # (re)Try several time to use new connection
-      while retry < max_retry:
-        try:
-          self.connection = self._getConnection(self.certificate_path, self.key_path, self.url)
-          self.connection.request(method='GET', url=api_path, headers={'Accept': link['type']}, body="")
-          response = self.connection.getresponse()
-          return json.loads(response.read())
-        except:
-          self.log("SlapOSMasterCommunicator: Connection failed..")
-          retry += 1
-          time.sleep(10)
-    self.log("SlapOSMasterCommunicator: All connection attempts failed after %d try.." %max_retry)
-    raise ValueError("SlapOSMasterCommunicator: Impossible to use connection")
-        
-  def _update_hosting_subscription_informations(self):
-    """
-    Add all not already visited hosting_subcription
-    # Visit all hosting subscriptions and fill a dict containing all
-    # new hosting subscriptions. ( like: {hs1_title:hs1_link, hs2_title:hs2_link, ..} )
-    # and a list of visited hosting_subsciption ( like: [hs1_link, hs2_link, ..] )
-    """
-    collection = self._curl(self.personnal_collection_link)
-    # For each hosting_subcription present in the collection
-    for hosting_subscription_link in collection['_links']['item']:
-      if hosting_subscription_link not in self.visited_hosting_subcriptions_link_list:
-        hosting_subscription = self._curl(hosting_subscription_link)
-        self.hosting_subcriptions_dict.update({hosting_subscription['title']:hosting_subscription_link})
-        self.visited_hosting_subcriptions_link_list.append(hosting_subscription_link)
-  
-  def _getRelatedInstanceLink(self, hosting_subscription_title):
-    """
-    Return a list of all related instance_url from an hosting_subscription_title
-    """
-    # Update informations
-    self._update_hosting_subscription_informations()
-    # Get specified hosting_subscription
-    hosting_subscription_link = self.hosting_subcriptions_dict[hosting_subscription_title]
-    hosting_subscription = self._curl(hosting_subscription_link)
-    assert(hosting_subscription_title == hosting_subscription['title'])
-    # Get instance collection related to this hosting_subscription
-    instance_collection_link = hosting_subscription['_links']['http://slapos.org/reg/instance']
-    instance_collection = self._curl(instance_collection_link)
-    related_instance_link_list = []
-    # For each instance present in the collection
-    for instance in instance_collection['_links']['item']:
-      related_instance_link_list.append(instance)
-    return related_instance_link_list
-
-  def getNewsFromInstanceLink(self, instance_link):
-      instance = self._curl(instance_link)
-      news_link = instance['_links']['http://slapos.org/reg/news']
-      return self._curl(news_link)
-
-  def isHostingSubsciptionStatusEqualTo(self, hosting_subscription_title, excepted_news_text):
-    """
-    Return True if all related instance state are equal to status,
-    or False if not or if there is are no related instances.
-    """
-    related_instance_link_list = _getRelatedInstanceLink(hosting_subscription_title)
-    # For each instance present in the collection
-    for instance_link in related_instance_link_list:
-      news = self.getNewsFromInstanceLink(instance_link)
-      if excepted_news_text != news['news'][0]['text']:
-        return False
-    return len(related_instance_link_list) > 0
-
-  def isInstanceReady(self, instance_link, status):
-    """
-    Return True if instance status and instance news text ~looks corresponding.
-    ( use the matching of 'correctly' and 'Instance' and status )
-    """
-    # XXX: SlapOS Master doesn't store any "news" about slave instances. Assume true.
-    if self._curl(instance_link)['slave']:
-      return True
-    text = self.getNewsFromInstanceLink(instance_link)['news'][0]['text']
-    return ('Instance' in text) and ('correctly' in text) and (status in text)
-
-  # check if provided 'status' = status
-  def isHostingSubscriptionReady(self, hosting_subscription_title, status):
-    """
-    Return True if all instance status and instance news text ~looks corresponding.
-    ( use the matching of 'correctly' and 'Instance' and status ).
-    """
-    instance_link_list = self._getRelatedInstanceLink(hosting_subscription_title)
-    for instance_link in instance_link_list:
-      if not self.isInstanceReady(instance_link, status):
-        return False
-    return len(instance_link_list) > 0
+      self._logger("ERROR getting instance state")
+      return INSTANCE_STATE_UNKNOWN
+ 
+    started = 0
+    stopped = 0
+    self.message_history.append(message_list)
+    for instance in message_list:
+      if not instance['slave'] and \
+        instance['state'] in (INSTANCE_STATE_UNKNOWN, INSTANCE_STATE_STARTED_WITH_ERROR):
+        return instance['state']
+      elif not instance['slave'] and instance['state'] == INSTANCE_STATE_STARTED:
+        started = 1
+      elif not instance['slave'] and instance['state'] == INSTANCE_STATE_STOPPED:
+        stopped = 1
+      
+      if instance['slave'] and instance['state'] == INSTANCE_STATE_UNKNOWN:
+        return instance['state']
+
+    if started and stopped:
+      return INSTANCE_STATE_STOPPED
+      return INSTANCE_STATE_UNKNOWN
     
-  def isRegisteredHostingSubscription(self, hosting_subscription_title):
-    """
-    Return True if the specified hosting_subscription is present on SlapOSMaster
-    """
-    self._update_hosting_subscription_informations()
-    if self.hosting_subcriptions_dict.get(hosting_subscription_title):
-      return True
-    return False
+    if started:
+      return INSTANCE_STATE_STARTED
 
-  def getHostingSubscriptionDict(self):
+    if stopped:
+      return INSTANCE_STATE_STOPPED
+
+  @retryOnNetworkFailure
+  def teardown(self):
     """
-    Return the dict of hosting subcription.
+    Interrupt a running test sequence, putting it in idle state.
     """
-    return self.hosting_subcriptions_dict
+    self._logger ('Invoking TearDown for %s@%s' % (self.url, self.name))
+    if self.request_kw is not None:
+       self._request('destroyed')
+    if self.computer_guid is not None:
+      self._supply('destroyed')
+    self.state = TESTER_STATE_INSTANCE_UNINSTALLED
 
-  def getHostingSubscriptionInformationDict(self, title):
+  def tic(self, now):
     """
-    Return a dict with informations about Hosting subscription
+    Check for missed deadlines (-> test failure), conditions for moving to
+    next state, and actually moving to next state (executing its payload).
     """
-    related_instance_link_list = self._getRelatedInstanceLink(title)
-    related_instance_link = None
-    # Get root instance
-    for link in related_instance_link_list:
-      instance = self._curl(link)
-      if title == instance['title']:
-        related_instance_link = link
-        break
-    # Return information dict
-    if related_instance_link:
-      related_instance = self._curl(related_instance_link)
-      return {
-        'title': related_instance['title'],
-        'status': related_instance['status'],
-        'software_url': related_instance['_links']['http://slapos.org/reg/release'],
-        'software_type': related_instance['software_type'],
-        'computer_guid': related_instance['sla']['computer_guid']
-      }
-    else:
-      return None
-  
\ No newline at end of file
+    self._logger ('[DEBUG] TIC')
+    deadline = self.deadline
+
+    if deadline < now and deadline is not None:
+      raise TestTimeout(self.state)
+
+    _, _, next_state, software_state, instance_state = self.transition_dict[
+        self.state]
+
+    if (software_state is None or
+          software_state == self._getSoftwareState()) and (
+          instance_state is None or
+          instance_state == self._getInstanceState()):
+
+      self._logger ('[DEBUG] Going to state %s (%r)', next_state, instance_state)
+      if next_state is None:
+        return None
+
+      self.state = next_state
+      stepfunc, delay, _, _, _ = self.transition_dict[next_state]
+      self.deadline = now + delay
+      stepfunc(self)
+    return self.deadline
+