telegraf/plugins/inputs/filestat/filestat.go

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package filestat
import (
"crypto/md5"
"fmt"
"io"
"os"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal/globpath"
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"github.com/influxdata/telegraf/plugins/inputs"
)
const sampleConfig = `
## Files to gather stats about.
## These accept standard unix glob matching rules, but with the addition of
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## ** 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" -> just tail the apache log file
##
## See https://github.com/gobwas/glob for more examples
##
files = ["/var/log/**.log"]
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## If true, read the entire file and calculate an md5 checksum.
md5 = false
`
type FileStat struct {
Md5 bool
Files []string
// maps full file paths to globmatch obj
globs map[string]*globpath.GlobPath
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}
func NewFileStat() *FileStat {
return &FileStat{
globs: make(map[string]*globpath.GlobPath),
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}
}
func (_ *FileStat) Description() string {
return "Read stats about given file(s)"
}
func (_ *FileStat) SampleConfig() string { return sampleConfig }
func (f *FileStat) Gather(acc telegraf.Accumulator) error {
var errS string
var err error
for _, filepath := range f.Files {
// Get the compiled glob object for this filepath
g, ok := f.globs[filepath]
if !ok {
if g, err = globpath.Compile(filepath); err != nil {
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errS += err.Error() + " "
continue
}
f.globs[filepath] = g
}
files := g.Match()
if len(files) == 0 {
acc.AddFields("filestat",
map[string]interface{}{
"exists": int64(0),
},
map[string]string{
"file": filepath,
})
continue
}
for fileName, fileInfo := range files {
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tags := map[string]string{
"file": fileName,
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}
fields := map[string]interface{}{
"exists": int64(1),
"size_bytes": fileInfo.Size(),
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}
if f.Md5 {
md5, err := getMd5(fileName)
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if err != nil {
errS += err.Error() + " "
} else {
fields["md5_sum"] = md5
}
}
acc.AddFields("filestat", fields, tags)
}
}
if errS != "" {
return fmt.Errorf(errS)
}
return nil
}
// Read given file and calculate an md5 hash.
func getMd5(file string) (string, error) {
of, err := os.Open(file)
if err != nil {
return "", err
}
defer of.Close()
hash := md5.New()
_, err = io.Copy(hash, of)
if err != nil {
// fatal error
return "", err
}
return fmt.Sprintf("%x", hash.Sum(nil)), nil
}
func init() {
inputs.Add("filestat", func() telegraf.Input {
return NewFileStat()
})
}