telegraf/plugins/outputs/file/file.go

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package file
import (
"fmt"
"io"
"os"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/outputs"
"github.com/influxdata/telegraf/plugins/serializers"
)
type File struct {
Files []string
writers []io.Writer
closers []io.Closer
serializer serializers.Serializer
}
var sampleConfig = `
## Files to write to, "stdout" is a specially handled file.
files = ["stdout", "/tmp/metrics.out"]
## Data format to output.
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## Each data format has its own unique set of configuration options, read
## more about them here:
## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
data_format = "influx"
`
func (f *File) SetSerializer(serializer serializers.Serializer) {
f.serializer = serializer
}
func (f *File) Connect() error {
if len(f.Files) == 0 {
f.Files = []string{"stdout"}
}
for _, file := range f.Files {
if file == "stdout" {
f.writers = append(f.writers, os.Stdout)
} else {
var of *os.File
var err error
if _, err := os.Stat(file); os.IsNotExist(err) {
of, err = os.Create(file)
} else {
of, err = os.OpenFile(file, os.O_APPEND|os.O_WRONLY, os.ModeAppend)
}
if err != nil {
return err
}
f.writers = append(f.writers, of)
f.closers = append(f.closers, of)
}
}
return nil
}
func (f *File) Close() error {
var errS string
for _, c := range f.closers {
if err := c.Close(); err != nil {
errS += err.Error() + "\n"
}
}
if errS != "" {
return fmt.Errorf(errS)
}
return nil
}
func (f *File) SampleConfig() string {
return sampleConfig
}
func (f *File) Description() string {
return "Send telegraf metrics to file(s)"
}
func (f *File) Write(metrics []telegraf.Metric) error {
if len(metrics) == 0 {
return nil
}
var writeErr error = nil
for _, metric := range metrics {
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b, err := f.serializer.Serialize(metric)
if err != nil {
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return fmt.Errorf("failed to serialize message: %s", err)
}
for _, writer := range f.writers {
_, err = writer.Write(b)
if err != nil && writer != os.Stdout {
writeErr = fmt.Errorf("E! failed to write message: %s, %s", b, err)
}
}
}
return writeErr
}
func init() {
outputs.Add("file", func() telegraf.Output {
return &File{}
})
}