Class: Riemann::Event

Inherits:
Object
  • Object
show all
Includes:
Beefcake::Message
Defined in:
lib/riemann/event.rb

Constant Summary collapse

VIRTUAL_FIELDS =

Fields which don’t really exist in protobufs, but which are reserved and can’t be used as attributes.

Set.new([:metric])
RESERVED_FIELDS =

Fields which are specially encoded in the Event protobuf–that is, they can’t be used as attributes.

fields.map do |i, field|
  field.name.to_sym
end.reduce(VIRTUAL_FIELDS) do |set, field|
  set << field
end

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash = nil) ⇒ Event

Returns a new instance of Event.



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
# File 'lib/riemann/event.rb', line 168

def initialize(hash = nil)
  if hash
    if hash[:metric]
      super hash
      self.metric = hash[:metric]
    else
      super hash
    end

    # Add extra attributes to the event as Attribute instances with values
    # converted to String
    self.attributes = hash.map do |key, value|
      unless RESERVED_FIELDS.include? key.to_sym
        Attribute.new(:key => key.to_s,
                      :value => (hash[key] || hash[key.to_sym]).to_s)
      end
    end.compact
  else
    super()
  end

  @time ||= Time.now.to_i
end

Class Method Details

.average(states, init = Event.new) ⇒ Object

Average a set of states together. Chooses the mean metric, the mode state, mode service, and the mean time. If init is provided, its values override (where present) the computed ones.



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/riemann/event.rb', line 33

def self.average(states, init = Event.new)
  init = case init
         when Event
           init.dup
         else
           Event.new init
         end

  # Metric
  init.metric_f ||= states.inject(0.0) { |a, state|
      a + (state.metric || 0)
    } / states.size
  if init.metric_f.nan?
    init.metric_f = 0.0
  end

  # Event
  init.state ||= mode states.map(&:state)
  init.service ||= mode states.map(&:service)

  # Time
  init.time = begin
    times = states.map(&:time).compact
    (times.inject(:+) / times.size).to_i
  rescue
  end
  init.time ||= Time.now.to_i

  init
end

.max(states, init = Event.new) ⇒ Object

Finds the maximum of a set of states. Metric is the maximum. Event is the highest, as defined by Dash.config.state_order. Time is the mean.



100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
 
# File 'lib/riemann/event.rb', line 100

def self.max(states, init = Event.new)
  init = case init
         when Event
           init.dup
         else
           Event.new init
         end

  # Metric
  init.metric_f ||= states.inject(0.0) { |a, state|
      a + (state.metric || 0)
    }
  if init.metric.nan?
    init.metric = 0.0
  end

  # Event
  init.state ||= states.inject(nil) do |max, state|
    state.state if Dash.config[:state_order][state.state] > Dash.config[:state_order][max]
  end

  # Time
  init.time = begin
    times = states.map(&:time).compact
    (times.inject(:+) / times.size).to_i
  rescue
  end
  init.time ||= Time.now.to_i

  init
end

.mode(array) ⇒ Object 



132
133
134
135
136
137
 
# File 'lib/riemann/event.rb', line 132

def self.mode(array)
  array.inject(Hash.new(0)) do |counts, e|
    counts[e] += 1
    counts
  end.sort_by { |e, count| count }.last.first rescue nil
end

.partition(states, field) ⇒ Object

Partition a list of states by a field Returns a hash of field_value => state



141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/riemann/event.rb', line 141

def self.partition(states, field)
  states.inject({}) do |p, state|
    k = state.send field
    if p.include? k
      p[k] << state
    else
      p[k] = [state]
    end
    p
  end
end

.sort(states, field) ⇒ Object

Sorts states by a field. nil values first.



154
155
156
157
158
159
160
161
162
163
164
165
166
 
# File 'lib/riemann/event.rb', line 154

def self.sort(states, field)
  states.sort do |a, b|
    a = a.send field
    b = b.send field
    if a.nil?
      -1
    elsif b.nil?
      1
    else
      a <=> b
    end
  end
end

.sum(states, init = Event.new) ⇒ Object

Sum a set of states together. Adds metrics, takes the mode state, mode service and the mean time. If init is provided, its values override (where present) the computed ones.



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
 
# File 'lib/riemann/event.rb', line 67

def self.sum(states, init = Event.new)
  init = case init
         when Event
           init.dup
         else
           Event.new init
         end

  # Metric
  init.metric_f ||= states.inject(0.0) { |a, state|
      a + (state.metric || 0)
    }
  if init.metric_f.nan?
    init.metric_f = 0.0
  end

  # Event
  init.state ||= mode states.map(&:state)
  init.service ||= mode states.map(&:service)

  # Time
  init.time = begin
    times = states.map(&:time).compact
    (times.inject(:+) / times.size).to_i
  rescue
  end
  init.time ||= Time.now.to_i

  init
end

Instance Method Details

#[](k) ⇒ Object

Look up attributes



210
211
212
213
214
215
216
 
# File 'lib/riemann/event.rb', line 210

def [](k)
  if RESERVED_FIELDS.include? k.to_sym
    super
  else
    r = attributes.find {|a| a.key.to_s == k.to_s }.value
  end
end

#[]=(k, v) ⇒ Object

Set attributes



219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/riemann/event.rb', line 219

def []=(k, v)
  if RESERVED_FIELDS.include? k.to_sym
    super
  else
    a = self.attributes.find {|a| a.key == k.to_s }
    if(a)
      a.value = v.to_s
    else
      self.attributes << Attribute.new(:key => k.to_s, :value => v.to_s)
    end
  end
end

#metric ⇒ Object 



192
193
194
195
196
 
# File 'lib/riemann/event.rb', line 192

def metric
  metric_d ||
    metric_sint64 ||
    metric_f
end

#metric=(m) ⇒ Object 



198
199
200
201
202
203
204
205
206
207
 
# File 'lib/riemann/event.rb', line 198

def metric=(m)
  if Integer === m and (-(2**63)...2**63) === m
    # Long
    self.metric_sint64 = m
    self.metric_f = m.to_f
  else
    self.metric_d = m.to_f
    self.metric_f = m.to_f
  end
end