telegraf/plugins/inputs/filecount/filecount.go

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package filecount
import (
"fmt"
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"os"
"path/filepath"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/internal/globpath"
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"github.com/influxdata/telegraf/plugins/inputs"
)
const sampleConfig = `
## Directory to gather stats about.
## deprecated in 1.9; use the directories option
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directory = "/var/cache/apt/archives"
## Directories to gather stats about.
## This accept standard unit glob matching rules, but with the addition of
## ** as a "super asterisk". ie:
## /var/log/** -> recursively find all directories in /var/log and count files in each directories
## /var/log/*/* -> find all directories with a parent dir in /var/log and count files in each directories
## /var/log -> count all files in /var/log and all of its subdirectories
directories = ["/var/cache/apt/archives"]
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## Only count files that match the name pattern. Defaults to "*".
name = "*.deb"
## Count files in subdirectories. Defaults to true.
recursive = false
## Only count regular files. Defaults to true.
regular_only = true
## Only count files that are at least this size. If size is
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## a negative number, only count files that are smaller than the
## absolute value of size. Acceptable units are B, KiB, MiB, KB, ...
## Without quotes and units, interpreted as size in bytes.
size = "0B"
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## Only count files that have not been touched for at least this
## duration. If mtime is negative, only count files that have been
## touched in this duration. Defaults to "0s".
mtime = "0s"
`
type FileCount struct {
Directory string // deprecated in 1.9
Directories []string
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Name string
Recursive bool
RegularOnly bool
Size internal.Size
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MTime internal.Duration `toml:"mtime"`
fileFilters []fileFilterFunc
}
type fileFilterFunc func(os.FileInfo) (bool, error)
func (_ *FileCount) Description() string {
return "Count files in a directory"
}
func (_ *FileCount) SampleConfig() string { return sampleConfig }
func rejectNilFilters(filters []fileFilterFunc) []fileFilterFunc {
filtered := make([]fileFilterFunc, 0, len(filters))
for _, f := range filters {
if f != nil {
filtered = append(filtered, f)
}
}
return filtered
}
func (fc *FileCount) nameFilter() fileFilterFunc {
if fc.Name == "*" {
return nil
}
return func(f os.FileInfo) (bool, error) {
match, err := filepath.Match(fc.Name, f.Name())
if err != nil {
return false, err
}
return match, nil
}
}
func (fc *FileCount) regularOnlyFilter() fileFilterFunc {
if !fc.RegularOnly {
return nil
}
return func(f os.FileInfo) (bool, error) {
return f.Mode().IsRegular(), nil
}
}
func (fc *FileCount) sizeFilter() fileFilterFunc {
if fc.Size.Size == 0 {
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return nil
}
return func(f os.FileInfo) (bool, error) {
if !f.Mode().IsRegular() {
return false, nil
}
if fc.Size.Size < 0 {
return f.Size() < -fc.Size.Size, nil
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}
return f.Size() >= fc.Size.Size, nil
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}
}
func (fc *FileCount) mtimeFilter() fileFilterFunc {
if fc.MTime.Duration == 0 {
return nil
}
return func(f os.FileInfo) (bool, error) {
age := absDuration(fc.MTime.Duration)
mtime := time.Now().Add(-age)
if fc.MTime.Duration < 0 {
return f.ModTime().After(mtime), nil
}
return f.ModTime().Before(mtime), nil
}
}
func absDuration(x time.Duration) time.Duration {
if x < 0 {
return -x
}
return x
}
func (fc *FileCount) count(acc telegraf.Accumulator, basedir string, recursive bool) {
numFiles := int64(0)
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walkFn := func(path string, file os.FileInfo, err error) error {
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
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if path == basedir {
return nil
}
match, err := fc.filter(file)
if err != nil {
acc.AddError(err)
return nil
}
if match {
numFiles++
}
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if !recursive && file.IsDir() {
return filepath.SkipDir
}
return nil
}
err := filepath.Walk(basedir, walkFn)
if err != nil {
acc.AddError(err)
return
}
acc.AddFields("filecount",
map[string]interface{}{
"count": numFiles,
},
map[string]string{
"directory": basedir,
},
)
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}
func (fc *FileCount) initFileFilters() {
filters := []fileFilterFunc{
fc.nameFilter(),
fc.regularOnlyFilter(),
fc.sizeFilter(),
fc.mtimeFilter(),
}
fc.fileFilters = rejectNilFilters(filters)
}
func (fc *FileCount) filter(file os.FileInfo) (bool, error) {
if fc.fileFilters == nil {
fc.initFileFilters()
}
for _, fileFilter := range fc.fileFilters {
match, err := fileFilter(file)
if err != nil {
return false, err
}
if !match {
return false, nil
}
}
return true, nil
}
func (fc *FileCount) Gather(acc telegraf.Accumulator) error {
globDirs := fc.getDirs()
dirs, err := getCompiledDirs(globDirs)
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if err != nil {
return err
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}
for _, dir := range dirs {
fc.count(acc, dir, fc.Recursive)
}
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return nil
}
func (fc *FileCount) getDirs() []string {
dirs := make([]string, len(fc.Directories))
for i, dir := range fc.Directories {
dirs[i] = dir
}
if fc.Directory != "" {
dirs = append(dirs, fc.Directory)
}
return dirs
}
func getCompiledDirs(dirs []string) ([]string, error) {
compiledDirs := []string{}
for _, dir := range dirs {
g, err := globpath.Compile(dir)
if err != nil {
return nil, fmt.Errorf("could not compile glob %v: %v", dir, err)
}
for path, file := range g.Match() {
if file.IsDir() {
compiledDirs = append(compiledDirs, path)
}
}
}
return compiledDirs, nil
}
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func NewFileCount() *FileCount {
return &FileCount{
Directory: "",
Directories: []string{},
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Name: "*",
Recursive: true,
RegularOnly: true,
Size: internal.Size{Size: 0},
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MTime: internal.Duration{Duration: 0},
fileFilters: nil,
}
}
func init() {
inputs.Add("filecount", func() telegraf.Input {
return NewFileCount()
})
}