telegraf/plugins/outputs/file/file_test.go

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package file
import (
"bytes"
"io"
"io/ioutil"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/serializers"
"github.com/influxdata/telegraf/testutil"
)
const (
expNewFile = "test1,tag1=value1 value=1 1257894000000000000\n"
expExistFile = "cpu,cpu=cpu0 value=100 1455312810012459582\n" +
"test1,tag1=value1 value=1 1257894000000000000\n"
)
func TestFileExistingFile(t *testing.T) {
fh := createFile()
s, _ := serializers.NewInfluxSerializer()
f := File{
Files: []string{fh.Name()},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
validateFile(fh.Name(), expExistFile, t)
err = f.Close()
assert.NoError(t, err)
}
func TestFileNewFile(t *testing.T) {
s, _ := serializers.NewInfluxSerializer()
fh := tmpFile()
f := File{
Files: []string{fh},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
validateFile(fh, expNewFile, t)
err = f.Close()
assert.NoError(t, err)
}
func TestFileExistingFiles(t *testing.T) {
fh1 := createFile()
fh2 := createFile()
fh3 := createFile()
s, _ := serializers.NewInfluxSerializer()
f := File{
Files: []string{fh1.Name(), fh2.Name(), fh3.Name()},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
validateFile(fh1.Name(), expExistFile, t)
validateFile(fh2.Name(), expExistFile, t)
validateFile(fh3.Name(), expExistFile, t)
err = f.Close()
assert.NoError(t, err)
}
func TestFileNewFiles(t *testing.T) {
s, _ := serializers.NewInfluxSerializer()
fh1 := tmpFile()
fh2 := tmpFile()
fh3 := tmpFile()
f := File{
Files: []string{fh1, fh2, fh3},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
validateFile(fh1, expNewFile, t)
validateFile(fh2, expNewFile, t)
validateFile(fh3, expNewFile, t)
err = f.Close()
assert.NoError(t, err)
}
func TestFileBoth(t *testing.T) {
fh1 := createFile()
fh2 := tmpFile()
s, _ := serializers.NewInfluxSerializer()
f := File{
Files: []string{fh1.Name(), fh2},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
validateFile(fh1.Name(), expExistFile, t)
validateFile(fh2, expNewFile, t)
err = f.Close()
assert.NoError(t, err)
}
func TestFileStdout(t *testing.T) {
// keep backup of the real stdout
old := os.Stdout
r, w, _ := os.Pipe()
os.Stdout = w
s, _ := serializers.NewInfluxSerializer()
f := File{
Files: []string{"stdout"},
serializer: s,
}
err := f.Connect()
assert.NoError(t, err)
err = f.Write(testutil.MockMetrics())
assert.NoError(t, err)
err = f.Close()
assert.NoError(t, err)
outC := make(chan string)
// copy the output in a separate goroutine so printing can't block indefinitely
go func() {
var buf bytes.Buffer
io.Copy(&buf, r)
outC <- buf.String()
}()
// back to normal state
w.Close()
// restoring the real stdout
os.Stdout = old
out := <-outC
assert.Equal(t, expNewFile, out)
}
func createFile() *os.File {
f, err := ioutil.TempFile("", "")
if err != nil {
panic(err)
}
f.WriteString("cpu,cpu=cpu0 value=100 1455312810012459582\n")
return f
}
func tmpFile() string {
d, err := ioutil.TempDir("", "")
if err != nil {
panic(err)
}
return d + internal.RandomString(10)
}
func validateFile(fname, expS string, t *testing.T) {
buf, err := ioutil.ReadFile(fname)
if err != nil {
panic(err)
}
assert.Equal(t, expS, string(buf))
}