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index_pattern_generator.go
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/
index_pattern_generator.go
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package kibana
import (
"encoding/json"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"github.com/elastic/beats/libbeat/common"
)
type IndexPatternGenerator struct {
indexName string
beatVersion string
fieldsYaml string
version common.Version
targetDir string
targetFilename string
}
// Create an instance of the Kibana Index Pattern Generator
func NewGenerator(indexName, beatName, beatDir, beatVersion string, version common.Version) (*IndexPatternGenerator, error) {
beatName = clean(beatName)
fieldsYaml := filepath.Join(beatDir, "fields.yml")
if _, err := os.Stat(fieldsYaml); err != nil {
return nil, err
}
return &IndexPatternGenerator{
indexName: indexName,
fieldsYaml: fieldsYaml,
beatVersion: beatVersion,
version: version,
targetDir: createTargetDir(beatDir, version),
targetFilename: beatName + ".json",
}, nil
}
// Create the Index-Pattern for Kibana for 5.x and default.
func (i *IndexPatternGenerator) Generate() (string, error) {
commonFields, err := common.LoadFieldsYaml(i.fieldsYaml)
if err != nil {
return "", err
}
var path string
if i.version.Major >= 6 {
path, err = i.generateMinVersion6(commonFields)
} else {
path, err = i.generateMinVersion5(commonFields)
}
return path, err
}
func (i *IndexPatternGenerator) generateMinVersion5(fields common.Fields) (string, error) {
transformed, err := generate(i.indexName, &i.version, fields)
if err != nil {
return "", err
}
file5x := filepath.Join(i.targetDir, i.targetFilename)
err = dumpToFile(file5x, transformed)
return file5x, err
}
func (i *IndexPatternGenerator) generateMinVersion6(fields common.Fields) (string, error) {
transformed, err := generate(i.indexName, &i.version, fields)
if err != nil {
return "", err
}
out := common.MapStr{
"version": i.beatVersion,
"objects": []common.MapStr{
common.MapStr{
"type": "index-pattern",
"id": i.indexName,
"version": 1,
"attributes": transformed,
},
},
}
file6x := filepath.Join(i.targetDir, i.targetFilename)
err = dumpToFile(file6x, out)
return file6x, err
}
func generate(indexName string, version *common.Version, f common.Fields) (common.MapStr, error) {
transformer, err := newTransformer("@timestamp", indexName, version, f)
if err != nil {
return nil, err
}
transformed, err := transformer.transformFields()
if err != nil {
return nil, err
}
fieldsBytes, err := json.Marshal(transformed["fields"])
if err != nil {
return nil, err
}
transformed["fields"] = string(fieldsBytes)
fieldFormatBytes, err := json.Marshal(transformed["fieldFormatMap"])
if err != nil {
return nil, err
}
transformed["fieldFormatMap"] = string(fieldFormatBytes)
return transformed, nil
}
func clean(name string) string {
reg := regexp.MustCompile("[^a-zA-Z0-9_]+")
return reg.ReplaceAllString(name, "")
}
func dumpToFile(f string, pattern common.MapStr) error {
patternIndent, err := json.MarshalIndent(pattern, "", " ")
if err != nil {
return err
}
err = ioutil.WriteFile(f, patternIndent, 0644)
if err != nil {
return err
}
return nil
}
func createTargetDir(baseDir string, version common.Version) string {
targetDir := filepath.Join(baseDir, "_meta", "kibana", getVersionPath(version), "index-pattern")
if _, err := os.Stat(targetDir); os.IsNotExist(err) {
os.MkdirAll(targetDir, 0777)
}
return targetDir
}
func getVersionPath(version common.Version) string {
versionPath := "default"
if version.Major == 5 {
versionPath = "5.x"
}
return versionPath
}