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