p2pool/util/graph.py

   1 from __future__ import absolute_import
   2 from __future__ import division
   3
   4 import math
   5
   6 from p2pool.util import math as math2
   7
   8
   9 class DataViewDescription(object):
  10     def __init__(self, bin_count, total_width):
  11         self.bin_count = bin_count
  12         self.bin_width = total_width/bin_count
  13
  14 def _shift(x, shift, pad_item):
  15     left_pad = math2.clip(shift, (0, len(x)))
  16     right_pad = math2.clip(-shift, (0, len(x)))
  17     return [pad_item]*left_pad + x[right_pad:-left_pad if left_pad else None] + [pad_item]*right_pad
  18
  19 combine_bins = math2.add_dicts_ext(lambda (a1, b1), (a2, b2): (a1+a2, b1+b2), (0, 0))
  20
  21 nothing = object()
  22 def keep_largest(n, squash_key=nothing, key=lambda x: x, add_func=lambda a, b: a+b):
  23     def _(d):
  24         items = sorted(d.iteritems(), key=lambda (k, v): (k != squash_key, key(v)), reverse=True)
  25         while len(items) > n:
  26             k, v = items.pop()
  27             if squash_key is not nothing:
  28                 items[-1] = squash_key, add_func(items[-1][1], v)
  29         return dict(items)
  30     return _
  31
  32 class DataView(object):
  33     def __init__(self, desc, ds_desc, last_bin_end, bins):
  34         assert len(bins) == desc.bin_count
  35
  36         self.desc = desc
  37         self.ds_desc = ds_desc
  38         self.last_bin_end = last_bin_end
  39         self.bins = bins
  40
  41     def _add_datum(self, t, value):
  42         if not self.ds_desc.multivalues:
  43             value = {'null': value}
  44         elif self.ds_desc.multivalue_undefined_means_0 and 'null' not in value:
  45             value = dict(value, null=0) # use null to hold sample counter
  46         shift = max(0, int(math.ceil((t - self.last_bin_end)/self.desc.bin_width)))
  47         self.bins = _shift(self.bins, shift, {})
  48         self.last_bin_end += shift*self.desc.bin_width
  49
  50         bin = int(math.ceil((self.last_bin_end - self.desc.bin_width - t)/self.desc.bin_width))
  51         if bin < self.desc.bin_count:
  52             self.bins[bin] = self.ds_desc.keep_largest_func(combine_bins(self.bins[bin], dict((k, (v, 1)) for k, v in value.iteritems())))
  53
  54     def get_data(self, t):
  55         shift = max(0, int(math.ceil((t - self.last_bin_end)/self.desc.bin_width)))
  56         bins = _shift(self.bins, shift, {})
  57         last_bin_end = self.last_bin_end + shift*self.desc.bin_width
  58
  59         assert last_bin_end - self.desc.bin_width <= t <= last_bin_end
  60
  61         def _((i, bin)):
  62             left, right = last_bin_end - self.desc.bin_width*(i + 1), min(t, last_bin_end - self.desc.bin_width*i)
  63             center, width = (left+right)/2, right-left
  64             if self.ds_desc.is_gauge and self.ds_desc.multivalue_undefined_means_0:
  65                 real_count = max([0] + [count for total, count in bin.itervalues()])
  66                 if real_count == 0:
  67                     val = None
  68                 else:
  69                     val = dict((k, total/real_count) for k, (total, count) in bin.iteritems())
  70                 default = 0
  71             elif self.ds_desc.is_gauge and not self.ds_desc.multivalue_undefined_means_0:
  72                 val = dict((k, total/count) for k, (total, count) in bin.iteritems())
  73                 default = None
  74             else:
  75                 val = dict((k, total/width) for k, (total, count) in bin.iteritems())
  76                 default = 0
  77             if not self.ds_desc.multivalues:
  78                 val = None if val is None else val.get('null', default)
  79             return center, val, width, default
  80         return map(_, enumerate(bins))
  81
  82
  83 class DataStreamDescription(object):
  84     def __init__(self, dataview_descriptions, is_gauge=True, multivalues=False, multivalues_keep=20, multivalues_squash_key=None, multivalue_undefined_means_0=False, default_func=None):
  85         self.dataview_descriptions = dataview_descriptions
  86         self.is_gauge = is_gauge
  87         self.multivalues = multivalues
  88         self.keep_largest_func = keep_largest(multivalues_keep, multivalues_squash_key, key=lambda (t, c): t/c if self.is_gauge else t, add_func=lambda (a1, b1), (a2, b2): (a1+a2, b1+b2))
  89         self.multivalue_undefined_means_0 = multivalue_undefined_means_0
  90         self.default_func = default_func
  91
  92 class DataStream(object):
  93     def __init__(self, desc, dataviews):
  94         self.desc = desc
  95         self.dataviews = dataviews
  96
  97     def add_datum(self, t, value=1):
  98         for dv_name, dv in self.dataviews.iteritems():
  99             dv._add_datum(t, value)
 100
 101
 102 class HistoryDatabase(object):
 103     @classmethod
 104     def from_obj(cls, datastream_descriptions, obj={}):
 105         def convert_bin(bin):
 106             if isinstance(bin, dict):
 107                 return bin
 108             total, count = bin
 109             if not isinstance(total, dict):
 110                 total = {'null': total}
 111             return dict((k, (v, count)) for k, v in total.iteritems()) if count else {}
 112         def get_dataview(ds_name, ds_desc, dv_name, dv_desc):
 113             if ds_name in obj:
 114                 ds_data = obj[ds_name]
 115                 if dv_name in ds_data:
 116                     dv_data = ds_data[dv_name]
 117                     if dv_data['bin_width'] == dv_desc.bin_width and len(dv_data['bins']) == dv_desc.bin_count:
 118                         return DataView(dv_desc, ds_desc, dv_data['last_bin_end'], map(convert_bin, dv_data['bins']))
 119             elif ds_desc.default_func is None:
 120                 return DataView(dv_desc, ds_desc, 0, dv_desc.bin_count*[{}])
 121             else:
 122                 return ds_desc.default_func(ds_name, ds_desc, dv_name, dv_desc, obj)
 123         return cls(dict(
 124             (ds_name, DataStream(ds_desc, dict(
 125                 (dv_name, get_dataview(ds_name, ds_desc, dv_name, dv_desc))
 126                 for dv_name, dv_desc in ds_desc.dataview_descriptions.iteritems()
 127             )))
 128             for ds_name, ds_desc in datastream_descriptions.iteritems()
 129         ))
 130
 131     def __init__(self, datastreams):
 132         self.datastreams = datastreams
 133
 134     def to_obj(self):
 135         return dict((ds_name, dict((dv_name, dict(last_bin_end=dv.last_bin_end, bin_width=dv.desc.bin_width, bins=dv.bins))
 136             for dv_name, dv in ds.dataviews.iteritems())) for ds_name, ds in self.datastreams.iteritems())