qcg/utils.py

   1 from django.core.paginator import Paginator
   2 from django.db import transaction
   3 from django.utils.timezone import now
   4 from pyqcg.service import Registry
   5 from pyqcg.utils import Credential, TimePeriod
   6
   7 from qcg import constants
   8
   9
  10 def get_attributes(obj, attrs):
  11     return {name: getattr(obj, name) for name in attrs if getattr(obj, name) is not None}
  12
  13
  14 def username_from_dn(dn):
  15     _, username = dn.rsplit('=', 1)
  16
  17     return username
  18
  19
  20 @transaction.atomic
  21 def update_user_data(user, proxy):
  22     from qcg.models import User, Job, Task, Allocation, NodeInfo
  23
  24     credential = Credential(proxy)
  25     registry = Registry(credential)
  26
  27     # put lock on user record (hopefully..?)
  28     user = User.objects.select_for_update().get(pk=user.pk)
  29
  30     changed_filter = {'changed': TimePeriod(after=user.last_update)}
  31
  32     ###################################
  33     # Jobs
  34     ###################################
  35     for qcg_job in registry.jobs(**changed_filter):
  36         params = Job.qcg_map(qcg_job, user)
  37         job_id = params.pop('job_id')
  38
  39         Job.objects.update_or_create(job_id=job_id, defaults=params)
  40
  41     ###################################
  42     # Tasks
  43     ###################################
  44     jobs_cache = {j.job_id: j for j in Job.objects.filter(owner=user)}
  45     for qcg_task in registry.tasks(**changed_filter):
  46         params = Task.qcg_map(qcg_task, jobs_cache)
  47         task_id = params.pop('task_id')
  48
  49         task, created = Task.objects.update_or_create(job__job_id=qcg_task.job_id, task_id=task_id, defaults=params)
  50
  51         if not created:
  52             task.allocations.all().delete()
  53
  54         for qcg_alloc in qcg_task.allocations:
  55             alloc = task.allocations.create(**Allocation.qcg_map(qcg_alloc))
  56
  57             for qcg_node in qcg_alloc.nodes:
  58                 alloc.nodes.create(**NodeInfo.qcg_map(qcg_node))
  59
  60     # release user lock
  61     user.last_update = now()
  62     user.save()
  63
  64
  65 def try_parse_int(s, default=None, base=10):
  66     try:
  67         return int(s, base)
  68     except (TypeError, ValueError):
  69         return default
  70
  71
  72 def paginator_context(request, objects, per_page=constants.PER_PAGE):
  73     paginator = Paginator(objects, per_page)
  74
  75     page_num = try_parse_int(request.GET.get('page'), 1)
  76     if not (1 <= page_num <= paginator.num_pages):
  77         page_num = 1
  78
  79     pages_range = range(max(2, min(page_num - 2, paginator.num_pages - 4)),
  80                         min(max(page_num + 2, 5), paginator.num_pages) + 1)
  81
  82     return {'page': paginator.page(page_num), 'num_pages': paginator.num_pages, 'pages_range': pages_range}