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timeline_sensor.rb
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timeline_sensor.rb
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shared_examples_for "timeline sensor" do |extra_init_values, default_event|
class Dummy
include PulseMeter::Mixins::Dumper
def name; :dummy end
def redis; PulseMeter.redis; end
end
let(:name){ :some_value_with_history }
let(:ttl){ 100 }
let(:raw_data_ttl){ 30 }
let(:interval){ 5 }
let(:reduce_delay){ 3 }
let(:good_init_values){ {:ttl => ttl, :raw_data_ttl => raw_data_ttl, :interval => interval, :reduce_delay => reduce_delay}.merge(extra_init_values || {}) }
let!(:sensor){ described_class.new(name, good_init_values) }
let(:dummy) {Dummy.new}
let(:base_class){ PulseMeter::Sensor::Base }
let(:redis){ PulseMeter.redis }
let(:sample_event) {default_event || 123}
before(:each) do
@interval_id = (Time.now.to_i / interval) * interval
@raw_data_key = sensor.raw_data_key(@interval_id)
@next_raw_data_key = sensor.raw_data_key(@interval_id + interval)
@start_of_interval = Time.at(@interval_id)
end
describe "#dump" do
it "should be dumped succesfully" do
expect {sensor.dump!}.not_to raise_exception
end
end
describe ".restore" do
before do
# no need to call sensor.dump! explicitly for it
# will be called automatically after creation
@restored = base_class.restore(sensor.name)
end
it "should restore #{described_class} instance" do
@restored.should be_instance_of(described_class)
end
it "should restore object with the same data" do
def inner_data(obj)
obj.instance_variables.sort.map {|v| obj.instance_variable_get(v)}
end
inner_data(sensor).should == inner_data(@restored)
end
end
describe "#event" do
it "should write events to redis" do
expect{
sensor.event(sample_event)
}.to change{ redis.keys('*').count }.by(1)
end
it "should write data so that it totally expires after :raw_data_ttl" do
key_count = redis.keys('*').count
sensor.event(sample_event)
Timecop.freeze(Time.now + raw_data_ttl + 1) do
redis.keys('*').count.should == key_count
end
end
it "should write data to bucket indicated by truncated timestamp" do
key = sensor.raw_data_key(@interval_id)
expect{
Timecop.freeze(@start_of_interval) do
sensor.event(sample_event)
end
}.to change{ redis.ttl(key) }
end
end
describe "#summarize" do
it "should convert data stored by raw_data_key to a value defined only by stored data" do
Timecop.freeze(@start_of_interval) do
sensor.event(sample_event)
end
Timecop.freeze(@start_of_interval + interval) do
sensor.event(sample_event)
end
sensor.summarize(@raw_data_key).should == sensor.summarize(@next_raw_data_key)
sensor.summarize(@raw_data_key).should_not be_nil
end
end
describe "#reduce" do
it "should store summarized value into data_key" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
val = sensor.summarize(@raw_data_key)
val.should_not be_nil
sensor.reduce(@interval_id)
redis.get(sensor.data_key(@interval_id)).should == val.to_s
end
it "should remove original raw_data_key" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
expect{
sensor.reduce(@interval_id)
}.to change{ redis.keys(sensor.raw_data_key(@interval_id)).count }.from(1).to(0)
end
it "should expire stored summarized data" do
Timecop.freeze(@start_of_interval) do
sensor.event(sample_event)
sensor.reduce(@interval_id)
redis.keys(sensor.data_key(@interval_id)).count.should == 1
end
Timecop.freeze(@start_of_interval + ttl + 1) do
redis.keys(sensor.data_key(@interval_id)).count.should == 0
end
end
it "should not store data if there is no corresponding raw data" do
Timecop.freeze(@start_of_interval) do
sensor.reduce(@interval_id)
redis.keys(sensor.data_key(@interval_id)).count.should == 0
end
end
end
describe "#reduce_all_raw" do
it "should reduce all data older than reduce_delay" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
val0 = sensor.summarize(@raw_data_key)
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
val1 = sensor.summarize(@next_raw_data_key)
expect{
Timecop.freeze(@start_of_interval + interval + interval + reduce_delay + 1) { sensor.reduce_all_raw }
}.to change{ redis.keys(sensor.raw_data_key('*')).count }.from(2).to(0)
redis.get(sensor.data_key(@interval_id)).should == val0.to_s
redis.get(sensor.data_key(@interval_id + interval)).should == val1.to_s
end
it "should not reduce fresh data" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
expect{
Timecop.freeze(@start_of_interval + interval + reduce_delay - 1) { sensor.reduce_all_raw }
}.not_to change{ redis.keys(sensor.raw_data_key('*')).count }
expect{
Timecop.freeze(@start_of_interval + interval + reduce_delay - 1) { sensor.reduce_all_raw }
}.not_to change{ redis.keys(sensor.data_key('*')).count }
end
end
describe ".reduce_all_raw" do
it "should silently skip objects without reduce logic" do
dummy.dump!
expect {described_class.reduce_all_raw}.not_to raise_exception
end
it "should send reduce_all_raw to all dumped objects" do
described_class.any_instance.should_receive(:reduce_all_raw)
described_class.reduce_all_raw
end
end
describe "#timeline_within" do
it "should raise exception unless both arguments are Time objects" do
[:q, nil, -1].each do |bad_value|
expect{ sensor.timeline_within(Time.now, bad_value) }.to raise_exception(ArgumentError)
expect{ sensor.timeline_within(bad_value, Time.now) }.to raise_exception(ArgumentError)
end
end
it "should return an array of SensorData objects corresponding to stored data for passed interval" do
sensor.event(sample_event)
now = Time.now
timeline = sensor.timeline_within(now - 1, now)
timeline.should be_kind_of(Array)
timeline.each{|i| i.should be_kind_of(SensorData) }
end
it "should return array of results containing as many results as there are sensor interval beginnings in the passed interval" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
future = @start_of_interval + 3600
Timecop.freeze(future) do
sensor.timeline_within(
Time.at(@start_of_interval + interval - 1),
Time.at(@start_of_interval + interval + 1)
).size.should == 1
sensor.timeline_within(
Time.at(@start_of_interval - 1),
Time.at(@start_of_interval + interval + 1)
).size.should == 2
end
Timecop.freeze(@start_of_interval + interval + 2) do
sensor.timeline_within(
Time.at(@start_of_interval + interval + 1),
Time.at(@start_of_interval + interval + 2)
).size.should == 0
end
end
it "should not return more than #{PulseMeter::Sensor::Timeline::MAX_TIMESPAN_POINTS} points" do
max = PulseMeter::Sensor::Timeline::MAX_TIMESPAN_POINTS
(1..10).each do |i|
timespan = sensor.interval * max * (2**i)
sensor.timeline_within(Time.now, Time.now - timespan).size.should < max
end
end
end
describe "#timeline" do
it "should raise exception if passed interval is not a positive integer" do
[:q, nil, -1].each do |bad_interval|
expect{ sensor.timeline(bad_interval) }.to raise_exception(ArgumentError)
end
end
it "should request timeline within interval from given number of seconds ago till now" do
Timecop.freeze do
now = Time.now
ago = interval * 100
sensor.timeline(ago).should == sensor.timeline_within(now - ago, now)
end
end
it "should return array of results containing as many results as there are sensor interval beginnings in the passed interval" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + interval + 1) do
sensor.timeline(2).size.should == 1
end
Timecop.freeze(@start_of_interval + interval + 2) do
sensor.timeline(1).size.should == 0
end
Timecop.freeze(@start_of_interval + interval + 1) do
sensor.timeline(2 + interval).size.should == 2
end
end
end
describe "#drop_within" do
it "should raise exception unless both arguments are Time objects" do
[:q, nil, -1].each do |bad_value|
expect{ sensor.drop_within(Time.now, bad_value) }.to raise_exception(ArgumentError)
expect{ sensor.drop_within(bad_value, Time.now) }.to raise_exception(ArgumentError)
end
end
it "should drop as many raw results as there are sensor interval beginnings in the passed interval" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
future = @start_of_interval + interval * 3
Timecop.freeze(future) do
sensor.drop_within(
Time.at(@start_of_interval + interval - 1),
Time.at(@start_of_interval + interval + 1)
).should == 1
data = sensor.timeline_within(
Time.at(@start_of_interval + interval - 1),
Time.at(@start_of_interval + interval + 1)
)
data.size.should == 1
data.first.value.should be_nil # since data is dropped
end
Timecop.freeze(@start_of_interval + interval + 2) do
sensor.drop_within(
Time.at(@start_of_interval + interval + 1),
Time.at(@start_of_interval + interval + 2)
).should == 0
end
end
it "should drop as many reduced results as there are sensor interval beginnings in the passed interval" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
future = @start_of_interval
Timecop.freeze(future) do
sensor.reduce_all_raw
sensor.drop_within(
Time.at(@start_of_interval + interval - 1),
Time.at(@start_of_interval + interval + 1)
).should == 1
data = sensor.timeline_within(
Time.at(@start_of_interval + interval - 1),
Time.at(@start_of_interval + interval + 1)
)
data.size.should == 1
data.first.value.should be_nil # since data is dropped
end
Timecop.freeze(@start_of_interval + interval + 2) do
sensor.drop_within(
Time.at(@start_of_interval + interval + 1),
Time.at(@start_of_interval + interval + 2)
).should == 0
end
end
end
describe "SensorData value for an interval" do
def check_sensor_data(sensor, value)
data = sensor.timeline(2).first
data.value.should == value
data.start_time.to_i.should == @interval_id
end
it "should contain summarized value stored by data_key for reduced intervals" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
sensor.reduce(@interval_id)
Timecop.freeze(@start_of_interval + 1){
check_sensor_data(sensor, redis.get(sensor.data_key(@interval_id)))
}
end
it "should contain summarized value based on raw data for intervals not yet reduced" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
Timecop.freeze(@start_of_interval + 1){
check_sensor_data(sensor, sensor.summarize(@raw_data_key))
}
end
it "should contain nil for intervals without any data" do
Timecop.freeze(@start_of_interval + 1) {
check_sensor_data(sensor, nil)
}
end
end
describe "#cleanup" do
it "should remove all sensor data (raw data, reduced data, annotations) from redis" do
Timecop.freeze(@start_of_interval){ sensor.event(sample_event) }
sensor.reduce(@interval_id)
Timecop.freeze(@start_of_interval + interval){ sensor.event(sample_event) }
sensor.annotate("Fooo sensor")
sensor.cleanup
redis.keys('*').should be_empty
end
end
end