151 lines
3.5 KiB
Go
151 lines
3.5 KiB
Go
package filepath
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import (
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"path/filepath"
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"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/processors"
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)
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type Options struct {
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BaseName []BaseOpts `toml:"basename"`
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DirName []BaseOpts `toml:"dirname"`
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Stem []BaseOpts
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Clean []BaseOpts
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Rel []RelOpts
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ToSlash []BaseOpts `toml:"toslash"`
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}
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type ProcessorFunc func(s string) string
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// BaseOpts contains options applicable to every function
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type BaseOpts struct {
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Field string
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Tag string
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Dest string
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}
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type RelOpts struct {
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BaseOpts
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BasePath string
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}
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const sampleConfig = `
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## Treat the tag value as a path and convert it to its last element, storing the result in a new tag
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# [[processors.filepath.basename]]
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# tag = "path"
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# dest = "basepath"
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## Treat the field value as a path and keep all but the last element of path, typically the path's directory
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# [[processors.filepath.dirname]]
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# field = "path"
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## Treat the tag value as a path, converting it to its the last element without its suffix
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# [[processors.filepath.stem]]
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# tag = "path"
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## Treat the tag value as a path, converting it to the shortest path name equivalent
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## to path by purely lexical processing
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# [[processors.filepath.clean]]
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# tag = "path"
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## Treat the tag value as a path, converting it to a relative path that is lexically
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## equivalent to the source path when joined to 'base_path'
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# [[processors.filepath.rel]]
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# tag = "path"
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# base_path = "/var/log"
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## Treat the tag value as a path, replacing each separator character in path with a '/' character. Has only
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## effect on Windows
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# [[processors.filepath.toslash]]
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# tag = "path"
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`
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func (o *Options) SampleConfig() string {
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return sampleConfig
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}
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func (o *Options) Description() string {
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return "Performs file path manipulations on tags and fields"
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}
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// applyFunc applies the specified function to the metric
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func (o *Options) applyFunc(bo BaseOpts, fn ProcessorFunc, metric telegraf.Metric) {
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if bo.Tag != "" {
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if v, ok := metric.GetTag(bo.Tag); ok {
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targetTag := bo.Tag
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if bo.Dest != "" {
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targetTag = bo.Dest
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}
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metric.AddTag(targetTag, fn(v))
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}
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}
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if bo.Field != "" {
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if v, ok := metric.GetField(bo.Field); ok {
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targetField := bo.Field
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if bo.Dest != "" {
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targetField = bo.Dest
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}
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// Only string fields are considered
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if v, ok := v.(string); ok {
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metric.AddField(targetField, fn(v))
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}
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}
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}
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}
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func stemFilePath(path string) string {
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return strings.TrimSuffix(filepath.Base(path), filepath.Ext(path))
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}
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// processMetric processes fields and tag values for a given metric applying the selected transformations
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func (o *Options) processMetric(metric telegraf.Metric) {
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// Stem
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for _, v := range o.Stem {
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o.applyFunc(v, stemFilePath, metric)
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}
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// Basename
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for _, v := range o.BaseName {
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o.applyFunc(v, filepath.Base, metric)
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}
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// Rel
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for _, v := range o.Rel {
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o.applyFunc(v.BaseOpts, func(s string) string {
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relPath, _ := filepath.Rel(v.BasePath, s)
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return relPath
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}, metric)
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}
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// Dirname
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for _, v := range o.DirName {
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o.applyFunc(v, filepath.Dir, metric)
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}
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// Clean
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for _, v := range o.Clean {
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o.applyFunc(v, filepath.Clean, metric)
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}
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// ToSlash
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for _, v := range o.ToSlash {
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o.applyFunc(v, filepath.ToSlash, metric)
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}
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}
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func (o *Options) Apply(in ...telegraf.Metric) []telegraf.Metric {
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for _, m := range in {
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o.processMetric(m)
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}
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return in
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}
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func init() {
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processors.Add("filepath", func() telegraf.Processor {
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return &Options{}
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})
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}
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