/
file.go
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/
file.go
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//go:generate ../../../tools/readme_config_includer/generator
package file
import (
_ "embed"
"fmt"
"io"
"os"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/config"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/rotate"
"github.com/influxdata/telegraf/plugins/outputs"
"github.com/influxdata/telegraf/plugins/serializers"
)
//go:embed sample.conf
var sampleConfig string
type File struct {
Files []string `toml:"files"`
RotationInterval config.Duration `toml:"rotation_interval"`
RotationMaxSize config.Size `toml:"rotation_max_size"`
RotationMaxArchives int `toml:"rotation_max_archives"`
UseBatchFormat bool `toml:"use_batch_format"`
CompressionAlgorithm string `toml:"compression_algorithm"`
CompressionLevel int `toml:"compression_level"`
Log telegraf.Logger `toml:"-"`
encoder internal.ContentEncoder
writer io.Writer
closers []io.Closer
serializer serializers.Serializer
}
func (*File) SampleConfig() string {
return sampleConfig
}
func (f *File) SetSerializer(serializer serializers.Serializer) {
f.serializer = serializer
}
func (f *File) Init() error {
var err error
if len(f.Files) == 0 {
f.Files = []string{"stdout"}
}
var options []internal.EncodingOption
if f.CompressionAlgorithm == "" {
f.CompressionAlgorithm = "identity"
}
if f.CompressionLevel >= 0 {
options = append(options, internal.WithCompressionLevel(f.CompressionLevel))
}
f.encoder, err = internal.NewContentEncoder(f.CompressionAlgorithm, options...)
return err
}
func (f *File) Connect() error {
var writers []io.Writer
for _, file := range f.Files {
if file == "stdout" {
writers = append(writers, os.Stdout)
} else {
of, err := rotate.NewFileWriter(
file, time.Duration(f.RotationInterval), int64(f.RotationMaxSize), f.RotationMaxArchives)
if err != nil {
return err
}
writers = append(writers, of)
f.closers = append(f.closers, of)
}
}
f.writer = io.MultiWriter(writers...)
return nil
}
func (f *File) Close() error {
var err error
for _, c := range f.closers {
errClose := c.Close()
if errClose != nil {
err = errClose
}
}
return err
}
func (f *File) Write(metrics []telegraf.Metric) error {
var writeErr error
if f.UseBatchFormat {
octets, err := f.serializer.SerializeBatch(metrics)
if err != nil {
f.Log.Errorf("Could not serialize metric: %v", err)
}
octets, err = f.encoder.Encode(octets)
if err != nil {
f.Log.Errorf("Could not compress metrics: %v", err)
}
_, err = f.writer.Write(octets)
if err != nil {
f.Log.Errorf("Error writing to file: %v", err)
}
} else {
for _, metric := range metrics {
b, err := f.serializer.Serialize(metric)
if err != nil {
f.Log.Debugf("Could not serialize metric: %v", err)
}
b, err = f.encoder.Encode(b)
if err != nil {
f.Log.Errorf("Could not compress metrics: %v", err)
}
_, err = f.writer.Write(b)
if err != nil {
writeErr = fmt.Errorf("failed to write message: %w", err)
}
}
}
return writeErr
}
func init() {
outputs.Add("file", func() telegraf.Output {
return &File{
CompressionLevel: -1,
}
})
}