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statsd_test.go
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statsd_test.go
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package statsd
import (
"bytes"
"errors"
"io"
"io/ioutil"
"net"
"sync"
"testing"
"time"
)
const (
testAddr = ":0"
testKey = "test_key"
)
var testDate = time.Date(2015, 10, 22, 16, 53, 0, 0, time.UTC)
func TestCount(t *testing.T) {
testOutput(t, "test_key:5|c", func(c *Client) {
c.Count(testKey, 5)
})
}
func TestIncrement(t *testing.T) {
testOutput(t, "test_key:1|c", func(c *Client) {
c.Increment(testKey)
})
}
func TestGauge(t *testing.T) {
testOutput(t, "test_key:5|g\ntest_key:0|g\ntest_key:-10|g", func(c *Client) {
c.Gauge(testKey, 5)
c.Gauge(testKey, -10)
})
}
func TestTiming(t *testing.T) {
testOutput(t, "test_key:6|ms", func(c *Client) {
c.Timing(testKey, 6)
})
}
func TestHistogram(t *testing.T) {
testOutput(t, "test_key:17|h", func(c *Client) {
c.Histogram(testKey, 17)
})
}
func TestNumbers(t *testing.T) {
testOutput(t,
"test_key:1|g\n"+
"test_key:1|g\n"+
"test_key:2|g\n"+
"test_key:2|g\n"+
"test_key:15|g\n"+
"test_key:15|g\n"+
"test_key:137|g\n"+
"test_key:137|g\n"+
"test_key:1|g\n"+
"test_key:1|g\n"+
"test_key:17.6|g\n"+
"test_key:0|g\n"+
"test_key:-42.5|g\n"+
"test_key:|g",
func(c *Client) {
c.Gauge(testKey, 1)
c.Gauge(testKey, uint(1))
c.Gauge(testKey, int64(2))
c.Gauge(testKey, uint64(2))
c.Gauge(testKey, int32(15))
c.Gauge(testKey, uint32(15))
c.Gauge(testKey, int16(137))
c.Gauge(testKey, uint16(137))
c.Gauge(testKey, int8(1))
c.Gauge(testKey, uint8(1))
c.Gauge(testKey, float64(17.6))
c.Gauge(testKey, float32(-42.5))
c.Gauge(testKey, "invalid")
})
}
func TestNewTiming(t *testing.T) {
i := 0
now = func() time.Time {
i++
switch i {
default:
return testDate
case 2:
return testDate.Add(10 * time.Millisecond)
case 3:
return testDate.Add(100 * time.Millisecond)
case 4:
return testDate.Add(time.Second)
}
}
defer func() { now = time.Now }()
testOutput(t, "test_key:10|ms\ntest_key:1000|ms", func(c *Client) {
timing := c.NewTiming()
timing.Send(testKey)
got := timing.Duration().Nanoseconds()
want := int64(100 * time.Millisecond)
if got != want {
t.Errorf("Duration() = %v, want %v", got, want)
}
timing.Send(testKey)
})
}
func TestUnique(t *testing.T) {
testOutput(t, "test_key:foo|s", func(c *Client) {
c.Unique(testKey, "foo")
})
}
func TestMute(t *testing.T) {
dialTimeout = func(string, string, time.Duration) (net.Conn, error) {
t.Fatal("net.Dial should not be called")
return nil, nil
}
defer func() { dialTimeout = net.DialTimeout }()
c, err := New(Mute(true))
if err != nil {
t.Errorf("New() = %v", err)
}
c.Increment(testKey)
c.Gauge(testKey, 1)
c.Timing(testKey, 1)
c.Histogram(testKey, 1)
c.Unique(testKey, "1")
c.Flush()
c.Close()
}
func TestSamplingRateOK(t *testing.T) {
testOutput(t, "test_key:3|c|@0.6\ntest_key:4|ms|@0.6", func(c *Client) {
randFloat = func() float32 { return 0.5 }
c.Count(testKey, 3)
c.Timing(testKey, 4)
}, SampleRate(0.6))
}
func TestSamplingRateKO(t *testing.T) {
testOutput(t, "", func(c *Client) {
randFloat = func() float32 { return 0.5 }
c.Count(testKey, 1)
c.Timing(testKey, 2)
}, SampleRate(0.3))
}
func TestPrefix(t *testing.T) {
testOutput(t, "foo.test_key:1|c", func(c *Client) {
c.Increment(testKey)
}, Prefix("foo"))
}
func TestNilTags(t *testing.T) {
testOutput(t, "test_key:1|c", func(c *Client) {
c.Increment(testKey)
}, TagsFormat(InfluxDB), Tags())
}
func TestInfluxDBTags(t *testing.T) {
testOutput(t, "test_key,tag1=value1,tag2=value2:1|c", func(c *Client) {
c.Increment(testKey)
}, TagsFormat(InfluxDB), Tags("tag1", "value1", "tag2", "value2"))
}
func TestDatadogTags(t *testing.T) {
testOutput(t, "test_key:1|c|#tag1:value1,tag2:value2", func(c *Client) {
c.Increment(testKey)
}, TagsFormat(Datadog), Tags("tag1", "value1", "tag2", "value2"))
}
func TestNoTagFormat(t *testing.T) {
testOutput(t, "test_key:1|c", func(c *Client) {
c.Increment(testKey)
}, Tags("tag1", "value1", "tag2", "value2"))
}
func TestOddTagsArgs(t *testing.T) {
dialTimeout = mockDial
defer func() { dialTimeout = net.DialTimeout }()
defer func() {
r := recover()
if r == nil {
t.Fatal("Tags should panic when only one argument is provided")
}
}()
_, _ = New(TagsFormat(InfluxDB), Tags("tag1"))
t.Fatal("A panic should occur")
}
func TestErrorHandler(t *testing.T) {
errorCount := 0
testClient(t, func(c *Client) {
getBuffer(c).err = errors.New("test error")
c.Increment(testKey)
c.Close()
if errorCount != 2 {
t.Errorf("Wrong error count, got %d, want 2", errorCount)
}
}, ErrorHandler(func(err error) {
if err == nil {
t.Error("Error should not be nil")
}
errorCount++
}))
}
func TestFlush(t *testing.T) {
testClient(t, func(c *Client) {
c.Increment(testKey)
c.Flush()
got := getOutput(c)
want := "test_key:1|c"
if got != want {
t.Errorf("Invalid output, got %q, want %q", got, want)
}
c.Close()
})
}
func TestFlushPeriod(t *testing.T) {
testClient(t, func(c *Client) {
c.Increment(testKey)
time.Sleep(time.Millisecond)
c.conn.mu.Lock()
got := getOutput(c)
want := "test_key:1|c"
if got != want {
t.Errorf("Invalid output, got %q, want %q", got, want)
}
c.conn.mu.Unlock()
c.Close()
}, FlushPeriod(time.Nanosecond))
}
func TestMaxPacketSize(t *testing.T) {
testClient(t, func(c *Client) {
c.Increment(testKey)
conn := getBuffer(c)
got := conn.buf.String()
if got != "" {
t.Errorf("Output should be empty, got %q", got)
}
c.Increment(testKey)
got = conn.buf.String()
want := "test_key:1|c"
if got != want {
t.Errorf("Invalid output, got %q, want %q", got, want)
}
conn.buf.Reset()
c.Close()
got = conn.buf.String()
if got != want {
t.Errorf("Invalid output, got %q, want %q", got, want)
}
}, MaxPacketSize(15))
}
func TestClone(t *testing.T) {
testOutput(t, "test_key:5|c", func(c *Client) {
c.Clone().Count(testKey, 5)
})
}
func TestCloneInherits(t *testing.T) {
testOutput(t, "app.test_key:5|c|@0.5|#tag1:value1", func(c *Client) {
clone := c.Clone()
randFloat = func() float32 { return 0.3 }
clone.Count(testKey, 5)
randFloat = func() float32 { return 0.8 }
clone.Count(testKey, 5)
},
TagsFormat(Datadog),
Prefix("app"),
SampleRate(0.5),
Tags("tag1", "value1"),
)
}
func TestCloneFromMuted(t *testing.T) {
testOutput(t, "", func(c *Client) {
c.Clone().Count(testKey, 5)
}, Mute(true))
}
func TestMuteClone(t *testing.T) {
testOutput(t, "", func(c *Client) {
c.Clone(Mute(true)).Count(testKey, 5)
})
}
func TestClonePrefix(t *testing.T) {
testOutput(t, "app.http.test_key:5|c", func(c *Client) {
c.Clone(Prefix("http")).Count(testKey, 5)
}, Prefix("app"))
}
func TestCloneRate(t *testing.T) {
testOutput(t, "", func(c *Client) {
randFloat = func() float32 { return 0.8 }
c.Clone(SampleRate(0.5)).Count(testKey, 5)
})
}
func TestCloneInfluxDBTags(t *testing.T) {
testOutput(t, "test_key,tag1=value1,tag2=value2:5|c", func(c *Client) {
clone := c.Clone(Tags("tag1", "value3", "tag2", "value2"))
clone.Count(testKey, 5)
}, TagsFormat(InfluxDB), Tags("tag1", "value1"))
}
func TestCloneDatadogTags(t *testing.T) {
testOutput(t, "test_key:5|c|#tag1:value1,tag2:value2", func(c *Client) {
clone := c.Clone(Tags("tag1", "value3", "tag2", "value2"))
clone.Count(testKey, 5)
}, TagsFormat(Datadog), Tags("tag1", "value1"))
}
func TestDialError(t *testing.T) {
dialTimeout = func(string, string, time.Duration) (net.Conn, error) {
return nil, errors.New("")
}
defer func() { dialTimeout = net.DialTimeout }()
c, err := New()
if c == nil || !c.muted {
t.Error("New() did not return a muted client")
}
if err == nil {
t.Error("New() did not return an error")
}
}
func TestConcurrency(t *testing.T) {
testOutput(t, "test_key:1|c\ntest_key:1|c\ntest_key:1|c", func(c *Client) {
var wg sync.WaitGroup
wg.Add(1)
c.Increment(testKey)
go func() {
c.Increment(testKey)
wg.Done()
}()
c.Increment(testKey)
wg.Wait()
})
}
func TestUDPNotListening(t *testing.T) {
dialTimeout = mockUDPClosed
defer func() { dialTimeout = net.DialTimeout }()
c, err := New()
if c == nil || !c.muted {
t.Error("New() did not return a muted client")
}
if err == nil {
t.Error("New should return an error")
}
}
type mockClosedUDPConn struct {
i int
net.Conn
}
func (c *mockClosedUDPConn) Write(p []byte) (int, error) {
c.i++
if c.i == 2 {
return 0, errors.New("test error")
}
return 0, nil
}
func (c *mockClosedUDPConn) Close() error {
return nil
}
func mockUDPClosed(string, string, time.Duration) (net.Conn, error) {
return &mockClosedUDPConn{}, nil
}
func testClient(t *testing.T, f func(*Client), options ...Option) {
dialTimeout = mockDial
defer func() { dialTimeout = net.DialTimeout }()
options = append([]Option{
FlushPeriod(0),
ErrorHandler(expectNoError(t)),
}, options...)
c, err := New(options...)
if err != nil {
t.Fatalf("New: %v", err)
}
f(c)
}
func testOutput(t *testing.T, want string, f func(*Client), options ...Option) {
testClient(t, func(c *Client) {
f(c)
c.Close()
got := getOutput(c)
if got != want {
t.Errorf("Invalid output, got:\n%q\nwant:\n%q", got, want)
}
}, options...)
}
func expectNoError(t *testing.T) func(error) {
return func(err error) {
t.Errorf("ErrorHandler should not receive an error: %v", err)
}
}
type testBuffer struct {
buf bytes.Buffer
err error
net.Conn
}
func (c *testBuffer) Write(p []byte) (int, error) {
if c.err != nil {
return 0, c.err
}
return c.buf.Write(p)
}
func (c *testBuffer) Close() error {
return c.err
}
func getBuffer(c *Client) *testBuffer {
if mock, ok := c.conn.w.(*testBuffer); ok {
return mock
}
return nil
}
func getOutput(c *Client) string {
if c.conn.w == nil {
return ""
}
return getBuffer(c).buf.String()
}
func mockDial(string, string, time.Duration) (net.Conn, error) {
return &testBuffer{}, nil
}
func TestUDP(t *testing.T) {
testNetwork(t, "udp")
}
func TestTCP(t *testing.T) {
testNetwork(t, "tcp")
}
func testNetwork(t *testing.T, network string) {
received := make(chan bool)
server := newServer(t, network, testAddr, func(p []byte) {
s := string(p)
if s != "test_key:1|c" {
t.Errorf("invalid output: %q", s)
}
received <- true
})
defer server.Close()
c, err := New(
Address(server.addr),
Network(network),
ErrorHandler(expectNoError(t)),
)
if err != nil {
t.Fatalf("New: %v", err)
}
c.Increment(testKey)
c.Close()
select {
case <-time.After(100 * time.Millisecond):
t.Error("server received nothing after 100ms")
case <-received:
}
}
type server struct {
t testing.TB
addr string
closer io.Closer
closed chan bool
}
func newServer(t testing.TB, network, addr string, f func([]byte)) *server {
s := &server{t: t, closed: make(chan bool)}
switch network {
case "udp":
laddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
t.Fatal(err)
}
conn, err := net.ListenUDP("udp", laddr)
if err != nil {
t.Fatal(err)
}
s.closer = conn
s.addr = conn.LocalAddr().String()
go func() {
buf := make([]byte, 1024)
for {
n, err := conn.Read(buf)
if err != nil {
s.closed <- true
return
}
if n > 0 {
f(buf[:n])
}
}
}()
case "tcp":
ln, err := net.Listen("tcp", addr)
if err != nil {
t.Fatal(err)
}
s.closer = ln
s.addr = ln.Addr().String()
go func() {
for {
conn, err := ln.Accept()
if err != nil {
s.closed <- true
return
}
p, err := ioutil.ReadAll(conn)
if err != nil {
t.Fatal(err)
}
if err := conn.Close(); err != nil {
t.Fatal(err)
}
f(p)
}
}()
default:
t.Fatalf("Invalid network: %q", network)
}
return s
}
func (s *server) Close() {
if err := s.closer.Close(); err != nil {
s.t.Error(err)
}
<-s.closed
}
func Benchmark(b *testing.B) {
serv := newServer(b, "udp", testAddr, func([]byte) {})
c, err := New(Address(serv.addr), FlushPeriod(0))
if err != nil {
b.Fatal(err)
}
for i := 0; i < b.N; i++ {
c.Increment(testKey)
c.Count(testKey, i)
c.Gauge(testKey, i)
c.Timing(testKey, i)
c.NewTiming().Send(testKey)
}
c.Close()
serv.Close()
}