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index_generator.go
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/
index_generator.go
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package opensearchutil
import (
_ "embed"
"encoding/json"
"github.com/pkg/errors"
)
type IndexGenerator struct {
optionContainer indexGeneratorOptionContainer
}
type (
indexDoc struct {
Mappings parentNode `json:"mappings"`
Settings *IndexSettings `json:"settings,omitempty"`
}
propertiesDoc struct {
// Property maps from a property name to another parentNode or to a leafNode
Properties map[string]interface{} `json:"properties"`
}
parentNode struct {
// Dynamic applies to the root mapping and can have a value "strict"
Dynamic *string `json:"dynamic,omitempty"`
// Property maps from a property name to another parentNode or to a leafNode
Properties map[string]interface{} `json:"properties"`
}
leafNode struct {
Type string `json:"type"`
Format *string `json:"format,omitempty"`
IndexPrefixes *map[string]string `json:"index_prefixes,omitempty"`
Analyzer *string `json:"analyzer,omitempty"`
}
)
func NewIndexGenerator(options ...IndexGeneratorOption) *IndexGenerator {
optContainer := indexGeneratorOptionContainer{}
for _, o := range options {
o.apply(&optContainer)
}
if optContainer.jsonFormatter == nil {
optContainer.jsonFormatter = NewMarshalIndentJsonFormatter()
}
return &IndexGenerator{optionContainer: optContainer}
}
// GenerateIndexJson generates a JSON document with fields "mappings" and "settings"
func (g *IndexGenerator) GenerateIndexJson(
mappingProperties []MappingProperty,
settings *IndexSettings,
options ...IndexGenerationOption,
) ([]byte, error) {
optContainer := indexGenerationOptionContainer{}
for _, o := range options {
o.apply(&optContainer)
}
var dynamic *string
if optContainer.strictMapping {
dynamic = MakePtr("strict")
}
jsonBytes, err := json.Marshal(indexDoc{
Mappings: parentNode{
Dynamic: dynamic,
Properties: g.buildProperties(mappingProperties),
},
Settings: settings,
})
if err != nil {
return nil, errors.Wrapf(err, "json.Marshal")
}
formattedJson, err := g.optionContainer.jsonFormatter.FormatJson(jsonBytes)
if err != nil {
return nil, errors.Wrapf(err, "formatJson")
}
return formattedJson, nil
}
// GenerateMappingsJson generates a JSON document with with a field "properties". This type of document is used to
// update an index mapping.
func (g *IndexGenerator) GenerateMappingsJson(mappingProperties []MappingProperty) ([]byte, error) {
jsonBytes, err := json.Marshal(propertiesDoc{
Properties: g.buildProperties(mappingProperties),
})
if err != nil {
return nil, errors.Wrapf(err, "json.Marshal")
}
formattedJson, err := g.optionContainer.jsonFormatter.FormatJson(jsonBytes)
if err != nil {
return nil, errors.Wrapf(err, "formatJson")
}
return formattedJson, nil
}
func (g *IndexGenerator) buildProperties(mappingProperties []MappingProperty) map[string]interface{} {
m := make(map[string]interface{}, len(mappingProperties))
for _, mp := range mappingProperties {
if mp.Children == nil {
node := leafNode{
Type: mp.FieldType,
Format: mp.FieldFormat,
Analyzer: mp.Analyzer,
IndexPrefixes: mp.IndexPrefixes,
}
m[mp.FieldName] = node
} else {
m[mp.FieldName] = parentNode{Properties: g.buildProperties(mp.Children)}
}
}
return m
}