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main.go
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main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"reflect"
"regexp"
"strings"
"gopkg.in/yaml.v2"
)
const (
pipelinePath = "%s/module/%s/%s/ingest/pipeline.json"
fieldsYmlPath = "%s/module/%s/%s/_meta/fields.yml"
)
var (
types = map[string]string{
"group": "group",
"DATA": "text",
"GREEDYDATA": "text",
"GREEDYMULTILINE": "text",
"HOSTNAME": "keyword",
"IPHOST": "keyword",
"IPORHOST": "keyword",
"LOGLEVEL": "keyword",
"MULTILINEQUERY": "text",
"NUMBER": "long",
"POSINT": "long",
"SYSLOGHOST": "keyword",
"SYSLOGTIMESTAMP": "text",
"TIMESTAMP": "text",
"USERNAME": "keyword",
"WORD": "keyword",
}
)
type pipeline struct {
Description string `json:"description"`
Processors []map[string]interface{} `json:"processors"`
OnFailure interface{} `json:"on_failure"`
}
type field struct {
Type string
Elements []string
}
type fieldYml struct {
Name string `yaml:"name"`
Description string `yaml:"description,omitempty"`
Example string `yaml:"example,omitempty"`
Type string `yaml:"type,omitempty"`
Fields []*fieldYml `yaml:"fields,omitempty"`
}
func newFieldYml(name, typeName string, noDoc bool) *fieldYml {
if noDoc {
return &fieldYml{
Name: name,
Type: typeName,
}
}
return &fieldYml{
Name: name,
Type: typeName,
Description: "Please add description",
Example: "Please add example",
}
}
func newField(lp string) field {
lp = lp[1 : len(lp)-1]
ee := strings.Split(lp, ":")
e := strings.Split(ee[1], ".")
return field{
Type: ee[0],
Elements: e,
}
}
func readPipeline(beatsPath, module, fileset string) (*pipeline, error) {
pp := fmt.Sprintf(pipelinePath, beatsPath, module, fileset)
r, err := ioutil.ReadFile(pp)
if err != nil {
return nil, err
}
var p pipeline
err = json.Unmarshal(r, &p)
if err != nil {
return nil, err
}
return &p, nil
}
func addNewField(fs []field, f field) []field {
for _, ff := range fs {
if reflect.DeepEqual(ff, f) {
return fs
}
}
return append(fs, f)
}
func getElementsFromPatterns(patterns []string) ([]field, error) {
r, err := regexp.Compile("{[\\.\\w\\:]*}")
if err != nil {
return nil, err
}
var fs []field
for _, lp := range patterns {
pp := r.FindAllString(lp, -1)
for _, p := range pp {
f := newField(p)
fs = addNewField(fs, f)
}
}
return fs, nil
}
func accumulatePatterns(grok interface{}) ([]string, error) {
for k, v := range grok.(map[string]interface{}) {
if k == "patterns" {
vs := v.([]interface{})
var p []string
for _, s := range vs {
p = append(p, s.(string))
}
return p, nil
}
}
return nil, fmt.Errorf("No patterns in pipeline")
}
func accumulateRemoveFields(remove interface{}, out []string) []string {
for k, v := range remove.(map[string]interface{}) {
if k == "field" {
vs := v.(string)
return append(out, vs)
}
}
return out
}
func accumulateRenameFields(rename interface{}, out map[string]string) map[string]string {
var from, to string
for k, v := range rename.(map[string]interface{}) {
if k == "field" {
from = v.(string)
}
if k == "target_field" {
to = v.(string)
}
}
out[from] = to
return out
}
type processors struct {
patterns []string
remove []string
rename map[string]string
}
func (p *processors) processFields() ([]field, error) {
f, err := getElementsFromPatterns(p.patterns)
if err != nil {
return nil, err
}
for i, ff := range f {
fs := strings.Join(ff.Elements, ".")
for k, mv := range p.rename {
if k == fs {
ff.Elements = strings.Split(mv, ".")
}
}
for _, rm := range p.remove {
if fs == rm {
f = append(f[:i], f[i+1:]...)
}
}
}
return f, nil
}
func getProcessors(p []map[string]interface{}) (*processors, error) {
var patterns, rmFields []string
mvFields := make(map[string]string)
for _, e := range p {
if ee, ok := e["grok"]; ok {
pp, err := accumulatePatterns(ee)
if err != nil {
return nil, err
}
patterns = append(patterns, pp...)
}
if rm, ok := e["remove"]; ok {
rmFields = accumulateRemoveFields(rm, rmFields)
}
if mv, ok := e["rename"]; ok {
mvFields = accumulateRenameFields(mv, mvFields)
}
}
if patterns == nil {
return nil, fmt.Errorf("No patterns in pipeline")
}
return &processors{
patterns: patterns,
remove: rmFields,
rename: mvFields,
}, nil
}
func getFieldByName(f []*fieldYml, name string) *fieldYml {
for _, ff := range f {
if ff.Name == name {
return ff
}
}
return nil
}
func insertLastField(f []*fieldYml, name, typeName string, noDoc bool) []*fieldYml {
ff := getFieldByName(f, name)
if ff != nil {
return f
}
nf := newFieldYml(name, types[typeName], noDoc)
return append(f, nf)
}
func insertGroup(out []*fieldYml, field field, index, count int, noDoc bool) []*fieldYml {
g := getFieldByName(out, field.Elements[index])
if g != nil {
g.Fields = generateField(g.Fields, field, index+1, count, noDoc)
return out
}
var groupFields []*fieldYml
groupFields = generateField(groupFields, field, index+1, count, noDoc)
group := newFieldYml(field.Elements[index], "group", noDoc)
group.Fields = groupFields
return append(out, group)
}
func generateField(out []*fieldYml, field field, index, count int, noDoc bool) []*fieldYml {
if index+1 == count {
return insertLastField(out, field.Elements[index], field.Type, noDoc)
}
return insertGroup(out, field, index, count, noDoc)
}
func generateFields(f []field, noDoc bool) []*fieldYml {
var out []*fieldYml
for _, ff := range f {
out = generateField(out, ff, 1, len(ff.Elements), noDoc)
}
return out
}
func (p *pipeline) toFieldsYml(noDoc bool) ([]byte, error) {
pr, err := getProcessors(p.Processors)
if err != nil {
return nil, err
}
var fs []field
fs, err = pr.processFields()
if err != nil {
return nil, err
}
f := generateFields(fs, noDoc)
var d []byte
d, err = yaml.Marshal(&f)
return d, nil
}
func writeFieldsYml(beatsPath, module, fileset string, f []byte) error {
p := fmt.Sprintf(fieldsYmlPath, beatsPath, module, fileset)
err := ioutil.WriteFile(p, f, 0664)
if err != nil {
return err
}
return nil
}
func main() {
module := flag.String("module", "", "Name of the module")
fileset := flag.String("fileset", "", "Name of the fileset")
beatsPath := flag.String("beats_path", ".", "Path to elastic/beats")
noDoc := flag.Bool("nodoc", false, "Generate documentation for fields")
flag.Parse()
if *module == "" {
fmt.Println("Missing parameter: module")
os.Exit(1)
}
if *fileset == "" {
fmt.Println("Missing parameter: fileset")
os.Exit(1)
}
p, err := readPipeline(*beatsPath, *module, *fileset)
if err != nil {
fmt.Printf("Cannot read pipeline.yml of fileset: %v\n", err)
os.Exit(2)
}
var d []byte
d, err = p.toFieldsYml(*noDoc)
if err != nil {
fmt.Printf("Cannot generate fields.yml for fileset: %v\n", err)
os.Exit(3)
}
err = writeFieldsYml(*beatsPath, *module, *fileset, d)
if err != nil {
fmt.Printf("Cannot write field.yml of fileset: %v\n", err)
os.Exit(4)
}
fmt.Printf("Fields.yml generated for %s/%s\n", *module, *fileset)
}