telegraf/plugins/outputs/influxdb/udp_test.go

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package influxdb_test
import (
"bytes"
"context"
"fmt"
"net"
"net/url"
"sync"
"testing"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
"github.com/influxdata/telegraf/plugins/outputs/influxdb"
"github.com/influxdata/telegraf/plugins/serializers/influx"
"github.com/stretchr/testify/require"
)
var (
metricString = "cpu value=42 0\n"
)
func getMetric() telegraf.Metric {
metric, err := metric.New(
"cpu",
map[string]string{},
map[string]interface{}{
"value": 42.0,
},
time.Unix(0, 0),
)
if err != nil {
panic(err)
}
return metric
}
func getURL() *url.URL {
u, err := url.Parse("udp://localhost:0")
if err != nil {
panic(err)
}
return u
}
type MockConn struct {
WriteF func(b []byte) (n int, err error)
CloseF func() error
}
func (c *MockConn) Write(b []byte) (n int, err error) {
return c.WriteF(b)
}
func (c *MockConn) Close() error {
return c.CloseF()
}
type MockDialer struct {
DialContextF func(network, address string) (influxdb.Conn, error)
}
func (d *MockDialer) DialContext(ctx context.Context, network string, address string) (influxdb.Conn, error) {
return d.DialContextF(network, address)
}
type MockSerializer struct {
SerializeF func(metric telegraf.Metric) ([]byte, error)
SerializeBatchF func(metrics []telegraf.Metric) ([]byte, error)
}
func (s *MockSerializer) Serialize(metric telegraf.Metric) ([]byte, error) {
return s.SerializeF(metric)
}
func (s *MockSerializer) SerializeBatch(metrics []telegraf.Metric) ([]byte, error) {
return s.SerializeBatchF(metrics)
}
func TestUDP_NewUDPClientNoURL(t *testing.T) {
config := &influxdb.UDPConfig{}
_, err := influxdb.NewUDPClient(config)
require.Equal(t, err, influxdb.ErrMissingURL)
}
func TestUDP_URL(t *testing.T) {
u := getURL()
config := &influxdb.UDPConfig{
URL: u,
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
require.Equal(t, u.String(), client.URL())
}
func TestUDP_Simple(t *testing.T) {
var buffer bytes.Buffer
config := &influxdb.UDPConfig{
URL: getURL(),
Dialer: &MockDialer{
DialContextF: func(network, address string) (influxdb.Conn, error) {
conn := &MockConn{
WriteF: func(b []byte) (n int, err error) {
buffer.Write(b)
return 0, nil
},
}
return conn, nil
},
},
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
ctx := context.Background()
err = client.Write(ctx, []telegraf.Metric{
getMetric(),
getMetric(),
})
require.NoError(t, err)
require.Equal(t, metricString+metricString, buffer.String())
}
func TestUDP_DialError(t *testing.T) {
u, err := url.Parse("invalid://127.0.0.1:9999")
require.NoError(t, err)
config := &influxdb.UDPConfig{
URL: u,
Dialer: &MockDialer{
DialContextF: func(network, address string) (influxdb.Conn, error) {
return nil, fmt.Errorf(
`unsupported scheme [invalid://localhost:9999]: "invalid"`)
},
},
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
ctx := context.Background()
err = client.Write(ctx, []telegraf.Metric{getMetric()})
require.Error(t, err)
}
func TestUDP_WriteError(t *testing.T) {
closed := false
config := &influxdb.UDPConfig{
URL: getURL(),
Dialer: &MockDialer{
DialContextF: func(network, address string) (influxdb.Conn, error) {
conn := &MockConn{
WriteF: func(b []byte) (n int, err error) {
return 0, fmt.Errorf(
"write udp 127.0.0.1:52190->127.0.0.1:9999: write: connection refused")
},
CloseF: func() error {
closed = true
return nil
},
}
return conn, nil
},
},
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
ctx := context.Background()
err = client.Write(ctx, []telegraf.Metric{getMetric()})
require.Error(t, err)
require.True(t, closed)
}
func TestUDP_SerializeError(t *testing.T) {
config := &influxdb.UDPConfig{
URL: getURL(),
Dialer: &MockDialer{
DialContextF: func(network, address string) (influxdb.Conn, error) {
conn := &MockConn{}
return conn, nil
},
},
Serializer: &MockSerializer{
SerializeF: func(metric telegraf.Metric) ([]byte, error) {
return nil, influx.ErrNeedMoreSpace
},
},
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
ctx := context.Background()
err = client.Write(ctx, []telegraf.Metric{getMetric()})
require.Error(t, err)
require.Contains(t, err.Error(), influx.ErrNeedMoreSpace.Error())
}
func TestUDP_WriteWithRealConn(t *testing.T) {
conn, err := net.ListenPacket("udp", "127.0.0.0:0")
require.NoError(t, err)
metrics := []telegraf.Metric{
getMetric(),
getMetric(),
}
buf := make([]byte, 200)
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
var total int
for _, _ = range metrics {
n, _, err := conn.ReadFrom(buf[total:])
if err != nil {
break
}
total += n
}
buf = buf[:total]
}()
addr := conn.LocalAddr()
u, err := url.Parse(fmt.Sprintf("%s://%s", addr.Network(), addr))
require.NoError(t, err)
config := &influxdb.UDPConfig{
URL: u,
}
client, err := influxdb.NewUDPClient(config)
require.NoError(t, err)
ctx := context.Background()
err = client.Write(ctx, metrics)
require.NoError(t, err)
wg.Wait()
require.Equal(t, metricString+metricString, string(buf))
}