Class: UState::Server::Index

Inherits:
Object
  • Object
show all
Defined in:
lib/ustate/server/index.rb

Defined Under Namespace

Classes: ParseFailed

Constant Summary collapse

THREADS = 
1000
BUFFER_SIZE = 
10
INSERT_RATE_INTERVAL =

Update metrics every

5
INSERT_TIMES_INTERVAL = 
5

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Index

Returns a new instance of Index.



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/ustate/server/index.rb', line 22

def initialize(opts = {})
  @db = Sequel.sqlite

  @server = opts[:server]
  @threads = opts[:threads] || THREADS
  @pool = []

  @on_state_change = []
  @on_state_once = []
  @on_state = []

  @insert_rate_interval = opts[:insert_rate_interval] || INSERT_RATE_INTERVAL
  @insert_times_interval = opts[:insert_times_interval] || INSERT_TIMES_INTERVAL
  setup_db
end

Instance Attribute Details

#db ⇒ Object (readonly)

Returns the value of attribute db.



18
19
20
 
# File 'lib/ustate/server/index.rb', line 18

def db
  @db
end

#insert_rate_interval ⇒ Object

Returns the value of attribute insert_rate_interval.



19
20
21
 
# File 'lib/ustate/server/index.rb', line 19

def insert_rate_interval
  @insert_rate_interval
end

#insert_times_interval ⇒ Object

Returns the value of attribute insert_times_interval.



20
21
22
 
# File 'lib/ustate/server/index.rb', line 20

def insert_times_interval
  @insert_times_interval
end

#queue ⇒ Object (readonly)

Returns the value of attribute queue.



18
19
20
 
# File 'lib/ustate/server/index.rb', line 18

def queue
  @queue
end

Instance Method Details

#<<(s) ⇒ Object 



42
43
44
45
46
47
48
 
# File 'lib/ustate/server/index.rb', line 42

def <<(s)
  t0 = Time.now
  process s
  dt = Time.now - t0
  @insert_times << dt
  @insert_rate << 1
end

#clear ⇒ Object 



38
39
40
 
# File 'lib/ustate/server/index.rb', line 38

def clear
  setup_db
end

#delete(state) ⇒ Object

Removes a state from the index.

Right now state is anything which responds to #host and #service. I’ll probably evolve the index to support arbitrary operations on all states matching a query, but haven’t thought out the API.



55
56
57
 
# File 'lib/ustate/server/index.rb', line 55

def delete(state)
  @db[:states].filter(host: state.host, service: state.service).delete
end

#on_state(state = nil, &block) ⇒ Object 



88
89
90
91
92
93
94
95
96
 
# File 'lib/ustate/server/index.rb', line 88

def on_state(state = nil, &block)
  if block_given?
    @on_state |= [block]
  else
    @on_state.each do |callback|
      callback.call state
    end
  end
end

#on_state_change(old = nil, new = nil, &block) ⇒ Object 



68
69
70
71
72
73
74
75
76
 
# File 'lib/ustate/server/index.rb', line 68

def on_state_change(old = nil, new = nil, &block)
  if block_given?
    @on_state_change |= [block]
  else
    @on_state_change.each do |callback|
      callback.call old, new
    end
  end
end

#on_state_once(state = nil, &block) ⇒ Object 



78
79
80
81
82
83
84
85
86
 
# File 'lib/ustate/server/index.rb', line 78

def on_state_once(state = nil, &block)
  if block_given?
    @on_state_once |= [block]
  else
    @on_state_once.each do |callback|
      callback.call state
    end
  end
end

#process(s) ⇒ Object 



98
99
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
131
132
 
# File 'lib/ustate/server/index.rb', line 98

def process(s)
  if s.once
    on_state_once s
    return on_state s
  end

  if current = @db[:states][host: s.host, service: s.service]
    # Update
    if current[:time] <= s.time
      if current[:state] != s.state
        on_state_change row_to_state(current), s
      end           

      # Update
      @db[:states].filter(host: s.host, service: s.service).update(
        state: s.state,
        time: s.time,
        description: s.description,
        metric_f: s.metric_f
      )
    end
  else
    # Insert
    @db[:states].insert(
      host: s.host,
      service: s.service,
      state: s.state,
      time: s.time,
      description: s.description,
      metric_f: s.metric_f
    )
  end

  on_state s
end

#query(q) ⇒ Object

Returns an array of States matching Query.



135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/ustate/server/index.rb', line 135

def query(q)
  parser = QueryStringParser.new
  if q.string
    unless expression = parser.parse(q.string)
      raise ParseFailed, "error parsing #{q.string.inspect} at line #{parser.failure_line}:#{parser.failure_column}: #{parser.failure_reason}"
    end
    filter = expression.sql
  else
    # No string? All states.
    filter = true
  end
  
  ds = @db[:states].filter filter
  ds.all.map do |row|
    row_to_state row
  end
end

#row_to_state(row) ⇒ Object

Converts a row to a State



154
155
156
 
# File 'lib/ustate/server/index.rb', line 154

def row_to_state(row)
  State.new(row)
end

#setup_db ⇒ Object 



158
159
160
161
162
163
164
165
166
167
168
169
 
# File 'lib/ustate/server/index.rb', line 158

def setup_db
  @db.drop_table :states rescue nil
  @db.create_table :states do
    String :host
    String :service
    String :state
    String :description, :text => true
    Integer :time
    Float :metric_f
    primary_key [:host, :service]
  end
end

#start ⇒ Object 



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
 
# File 'lib/ustate/server/index.rb', line 171

def start
  stop!
  @pool = []

  @insert_rate = MetricThread.new(Mtrc::Rate) do |r|
    self << State.new(
      service: "ustate insert rate",
      state: "ok",
      host: Socket.gethostname,
      time: Time.now.to_i,
      metric_f: r.rate.to_f,
    )
  end
  @insert_rate.interval = @insert_rate_interval
  
  @insert_times = MetricThread.new(Mtrc::SortedSamples) do |r|
    self << State.new(
      service: "ustate insert 50",
      state: "ok",
      host: Socket.gethostname,
      time: Time.now.to_i,
      metric_f: r % 50,
    )
    self << State.new(
      service: "ustate insert 95",
      state: "ok",
      host: Socket.gethostname,
      time: Time.now.to_i,
      metric_f: r % 95,
    )
    self << State.new(
      service: "ustate insert 99",
      state: "ok",
      host: Socket.gethostname,
      time: Time.now.to_i,
      metric_f: r % 99,
    )
  end
  @insert_times.interval = @insert_times_interval
end

#stop ⇒ Object

Finish up



213
214
215
216
 
# File 'lib/ustate/server/index.rb', line 213

def stop
  @insert_rate.stop rescue nil
  @insert_times.stop rescue nil
end

#stop! ⇒ Object 



218
219
220
221
222
 
# File 'lib/ustate/server/index.rb', line 218

def stop!
  @pool.each do |thread|
    thread.kill
  end
end

#thread(s) ⇒ Object 



59
60
61
62
63
64
65
66
 
# File 'lib/ustate/server/index.rb', line 59

def thread(s)
  Thread.new do
    process s
    @pooltex.synchronize do
      @pool.delete Thread.current
    end
  end
end