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statsd_spec.rb
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statsd_spec.rb
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require 'helper'
describe Statsd do
class Statsd
public :socket
end
before do
@statsd = Statsd.new('localhost', 1234)
@socket = Thread.current[:statsd_socket] = FakeUDPSocket.new
end
after { Thread.current[:statsd_socket] = nil }
describe "#initialize" do
it "should set the host and port" do
@statsd.host.must_equal 'localhost'
@statsd.port.must_equal 1234
end
it "should default the host to 127.0.0.1 and port to 8125" do
statsd = Statsd.new
statsd.host.must_equal '127.0.0.1'
statsd.port.must_equal 8125
end
end
describe "#host and #port" do
it "should set host and port" do
@statsd.host = '1.2.3.4'
@statsd.port = 5678
@statsd.host.must_equal '1.2.3.4'
@statsd.port.must_equal 5678
end
it "should not resolve hostnames to IPs" do
@statsd.host = 'localhost'
@statsd.host.must_equal 'localhost'
end
it "should set nil host to default" do
@statsd.host = nil
@statsd.host.must_equal '127.0.0.1'
end
it "should set nil port to default" do
@statsd.port = nil
@statsd.port.must_equal 8125
end
end
describe "#increment" do
it "should format the message according to the statsd spec" do
@statsd.increment('foobar')
@socket.recv.must_equal ['foobar:1|c']
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.increment('foobar', 0.5)
@socket.recv.must_equal ['foobar:1|c|@0.5']
end
end
end
describe "#decrement" do
it "should format the message according to the statsd spec" do
@statsd.decrement('foobar')
@socket.recv.must_equal ['foobar:-1|c']
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.decrement('foobar', 0.5)
@socket.recv.must_equal ['foobar:-1|c|@0.5']
end
end
end
describe "#gauge" do
it "should send a message with a 'g' type, per the nearbuy fork" do
@statsd.gauge('begrutten-suffusion', 536)
@socket.recv.must_equal ['begrutten-suffusion:536|g']
@statsd.gauge('begrutten-suffusion', -107.3)
@socket.recv.must_equal ['begrutten-suffusion:-107.3|g']
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.gauge('begrutten-suffusion', 536, 0.1)
@socket.recv.must_equal ['begrutten-suffusion:536|g|@0.1']
end
end
end
describe "#timing" do
it "should format the message according to the statsd spec" do
@statsd.timing('foobar', 500)
@socket.recv.must_equal ['foobar:500|ms']
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.timing('foobar', 500, 0.5)
@socket.recv.must_equal ['foobar:500|ms|@0.5']
end
end
end
describe "#set" do
it "should format the message according to the statsd spec" do
@statsd.set('foobar', 765)
@socket.recv.must_equal ['foobar:765|s']
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.set('foobar', 500, 0.5)
@socket.recv.must_equal ['foobar:500|s|@0.5']
end
end
end
describe "#time" do
it "should format the message according to the statsd spec" do
@statsd.time('foobar') { 'test' }
@socket.recv.must_equal ['foobar:0|ms']
end
it "should return the result of the block" do
result = @statsd.time('foobar') { 'test' }
result.must_equal 'test'
end
describe "with a sample rate" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should format the message according to the statsd spec" do
@statsd.time('foobar', 0.5) { 'test' }
@socket.recv.must_equal ['foobar:0|ms|@0.5']
end
end
end
describe "#sampled" do
describe "when the sample rate is 1" do
before { class << @statsd; def rand; raise end; end }
it "should send" do
@statsd.timing('foobar', 500, 1)
@socket.recv.must_equal ['foobar:500|ms']
end
end
describe "when the sample rate is greater than a random value [0,1]" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should send" do
@statsd.timing('foobar', 500, 0.5)
@socket.recv.must_equal ['foobar:500|ms|@0.5']
end
end
describe "when the sample rate is less than a random value [0,1]" do
before { class << @statsd; def rand; 1; end; end } # ensure no delivery
it "should not send" do
@statsd.timing('foobar', 500, 0.5).must_equal nil
end
end
describe "when the sample rate is equal to a random value [0,1]" do
before { class << @statsd; def rand; 0; end; end } # ensure delivery
it "should send" do
@statsd.timing('foobar', 500, 0.5)
@socket.recv.must_equal ['foobar:500|ms|@0.5']
end
end
end
describe "with namespace" do
before { @statsd.namespace = 'service' }
it "should add namespace to increment" do
@statsd.increment('foobar')
@socket.recv.must_equal ['service.foobar:1|c']
end
it "should add namespace to decrement" do
@statsd.decrement('foobar')
@socket.recv.must_equal ['service.foobar:-1|c']
end
it "should add namespace to timing" do
@statsd.timing('foobar', 500)
@socket.recv.must_equal ['service.foobar:500|ms']
end
it "should add namespace to gauge" do
@statsd.gauge('foobar', 500)
@socket.recv.must_equal ['service.foobar:500|g']
end
end
describe "with postfix" do
before { @statsd.postfix = 'ip-23-45-56-78' }
it "should add postfix to increment" do
@statsd.increment('foobar')
@socket.recv.must_equal ['foobar.ip-23-45-56-78:1|c']
end
it "should add postfix to decrement" do
@statsd.decrement('foobar')
@socket.recv.must_equal ['foobar.ip-23-45-56-78:-1|c']
end
it "should add namespace to timing" do
@statsd.timing('foobar', 500)
@socket.recv.must_equal ['foobar.ip-23-45-56-78:500|ms']
end
it "should add namespace to gauge" do
@statsd.gauge('foobar', 500)
@socket.recv.must_equal ['foobar.ip-23-45-56-78:500|g']
end
end
describe '#postfix=' do
describe "when nil, false, or empty" do
it "should set postfix to nil" do
[nil, false, ''].each do |value|
@statsd.postfix = 'a postfix'
@statsd.postfix = value
@statsd.postfix.must_equal nil
end
end
end
end
describe "with logging" do
require 'stringio'
before { Statsd.logger = Logger.new(@log = StringIO.new)}
it "should write to the log in debug" do
Statsd.logger.level = Logger::DEBUG
@statsd.increment('foobar')
@log.string.must_match "Statsd: foobar:1|c"
end
it "should not write to the log unless debug" do
Statsd.logger.level = Logger::INFO
@statsd.increment('foobar')
@log.string.must_be_empty
end
end
describe "stat names" do
it "should accept anything as stat" do
@statsd.increment(Object, 1)
end
it "should replace ruby constant delimeter with graphite package name" do
class Statsd::SomeClass; end
@statsd.increment(Statsd::SomeClass, 1)
@socket.recv.must_equal ['Statsd.SomeClass:1|c']
end
it "should replace statsd reserved chars in the stat name" do
@statsd.increment('ray@hostname.blah|blah.blah:blah', 1)
@socket.recv.must_equal ['ray_hostname.blah_blah.blah_blah:1|c']
end
end
describe "handling socket errors" do
before do
require 'stringio'
Statsd.logger = Logger.new(@log = StringIO.new)
@socket.instance_eval { def send(*) raise SocketError end }
end
it "should ignore socket errors" do
@statsd.increment('foobar').must_equal nil
end
it "should log socket errors" do
@statsd.increment('foobar')
@log.string.must_match 'Statsd: SocketError'
end
end
describe "batching" do
it "should have a default batch size of 10" do
@statsd.batch_size.must_equal 10
end
it "should have a modifiable batch size" do
@statsd.batch_size = 7
@statsd.batch_size.must_equal 7
@statsd.batch do |b|
b.batch_size.must_equal 7
end
end
it "should flush the batch at the batch size or at the end of the block" do
@statsd.batch do |b|
b.batch_size = 3
# The first three should flush, the next two will be flushed when the
# block is done.
5.times { b.increment('foobar') }
@socket.recv.must_equal [(["foobar:1|c"] * 3).join("\n")]
end
@socket.recv.must_equal [(["foobar:1|c"] * 2).join("\n")]
end
it "should not flush to the socket if the backlog is empty" do
batch = Statsd::Batch.new(@statsd)
batch.flush
@socket.recv.must_be :nil?
batch.increment 'foobar'
batch.flush
@socket.recv.must_equal %w[foobar:1|c]
end
it "should support setting namespace for the underlying instance" do
batch = Statsd::Batch.new(@statsd)
batch.namespace = 'ns'
@statsd.namespace.must_equal 'ns'
end
it "should support setting host for the underlying instance" do
batch = Statsd::Batch.new(@statsd)
batch.host = '1.2.3.4'
@statsd.host.must_equal '1.2.3.4'
end
it "should support setting port for the underlying instance" do
batch = Statsd::Batch.new(@statsd)
batch.port = 42
@statsd.port.must_equal 42
end
end
describe "thread safety" do
it "should use a thread local socket" do
Thread.current[:statsd_socket].must_equal @socket
@statsd.send(:socket).must_equal @socket
end
it "should create a new socket when used in a new thread" do
sock = @statsd.send(:socket)
Thread.new { Thread.current[:statsd_socket] }.value.wont_equal sock
end
end
end
describe Statsd do
describe "with a real UDP socket" do
it "should actually send stuff over the socket" do
socket = UDPSocket.new
host, port = 'localhost', 12345
socket.bind(host, port)
statsd = Statsd.new(host, port)
statsd.increment('foobar')
message = socket.recvfrom(16).first
message.must_equal 'foobar:1|c'
end
end
end if ENV['LIVE']