telegraf/plugins/inputs/file/file.go

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package file
import (
"fmt"
"io/ioutil"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal/globpath"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
)
type File struct {
Files []string `toml:"files"`
FromBeginning bool
parser parsers.Parser
filenames []string
}
const sampleConfig = `
## Files to parse each interval.
## These accept standard unix glob matching rules, but with the addition of
## ** as a "super asterisk". ie:
## /var/log/**.log -> recursively find all .log files in /var/log
## /var/log/*/*.log -> find all .log files with a parent dir in /var/log
## /var/log/apache.log -> only tail the apache log file
files = ["/var/log/apache/access.log"]
## The dataformat to be read from files
## 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_INPUT.md
data_format = "influx"
`
// SampleConfig returns the default configuration of the Input
func (f *File) SampleConfig() string {
return sampleConfig
}
func (f *File) Description() string {
return "reload and gather from file[s] on telegraf's interval"
}
func (f *File) Gather(acc telegraf.Accumulator) error {
err := f.refreshFilePaths()
if err != nil {
return err
}
for _, k := range f.filenames {
metrics, err := f.readMetric(k)
if err != nil {
return err
}
for _, m := range metrics {
acc.AddFields(m.Name(), m.Fields(), m.Tags(), m.Time())
}
}
return nil
}
func (f *File) SetParser(p parsers.Parser) {
f.parser = p
}
func (f *File) refreshFilePaths() error {
var allFiles []string
for _, file := range f.Files {
g, err := globpath.Compile(file)
if err != nil {
return fmt.Errorf("could not compile glob %v: %v", file, err)
}
files := g.Match()
if len(files) <= 0 {
return fmt.Errorf("could not find file: %v", file)
}
for k := range files {
allFiles = append(allFiles, k)
}
}
f.filenames = allFiles
return nil
}
func (f *File) readMetric(filename string) ([]telegraf.Metric, error) {
fileContents, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("E! Error file: %v could not be read, %s", filename, err)
}
return f.parser.Parse(fileContents)
}
func init() {
inputs.Add("file", func() telegraf.Input {
return &File{}
})
}