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pindex_bleve_doc.go
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pindex_bleve_doc.go
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// Copyright (c) 2016 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an "AS
// IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language
// governing permissions and limitations under the License.
package cbft
import (
"bytes"
"encoding/json"
"fmt"
"reflect"
"regexp"
"strings"
)
type BleveInterface interface{}
type BleveDocument struct {
typ string
BleveInterface `'json:""`
}
func (c *BleveDocument) Type() string {
return c.typ
}
type BleveDocumentConfig struct {
Mode string `json:"mode"`
TypeField string `json:"type_field"`
DocIDPrefixDelim string `json:"docid_prefix_delim"`
DocIDRegexp *regexp.Regexp `json:"docid_regexp"`
}
func (b *BleveDocumentConfig) UnmarshalJSON(data []byte) error {
docIDRegexp := ""
if b.DocIDRegexp != nil {
docIDRegexp = b.DocIDRegexp.String()
}
tmp := struct {
Mode string `json:"mode"`
TypeField string `json:"type_field"`
DocIDPrefixDelim string `json:"docid_prefix_delim"`
DocIDRegexp string `json:"docid_regexp"`
}{
Mode: b.Mode,
TypeField: b.TypeField,
DocIDPrefixDelim: b.DocIDPrefixDelim,
DocIDRegexp: docIDRegexp,
}
err := json.Unmarshal(data, &tmp)
if err != nil {
return err
}
b.Mode = tmp.Mode
switch tmp.Mode {
case "type_field":
b.TypeField = tmp.TypeField
if b.TypeField == "" {
return fmt.Errorf("with mode type_field, type_field cannot be empty")
}
case "docid_prefix":
b.DocIDPrefixDelim = tmp.DocIDPrefixDelim
if b.DocIDPrefixDelim == "" {
return fmt.Errorf("with mode docid_prefix, docid_prefix_delim cannot be empty")
}
case "docid_regexp":
if tmp.DocIDRegexp != "" {
b.DocIDRegexp, err = regexp.Compile(tmp.DocIDRegexp)
if err != nil {
return err
}
} else {
return fmt.Errorf("with mode docid_regexp, docid_regexp cannot be empty")
}
default:
return fmt.Errorf("unknown mode: %s", tmp.Mode)
}
return nil
}
func (b *BleveDocumentConfig) MarshalJSON() ([]byte, error) {
docIDRegexp := ""
if b.DocIDRegexp != nil {
docIDRegexp = b.DocIDRegexp.String()
}
tmp := struct {
Mode string `json:"mode"`
TypeField string `json:"type_field"`
DocIDPrefixDelim string `json:"docid_prefix_delim"`
DocIDRegexp string `json:"docid_regexp"`
}{
Mode: b.Mode,
TypeField: b.TypeField,
DocIDPrefixDelim: b.DocIDPrefixDelim,
DocIDRegexp: docIDRegexp,
}
return json.Marshal(&tmp)
}
// buildCbftDocument returns a CbftDocument for the k/v pair
// NOTE: err may be non-nil AND a document is returned
// this allows the error to be logged, but a stub document to be indexed
func (b *BleveDocumentConfig) buildDocument(key, val []byte, defaultType string) (*BleveDocument, error) {
var v interface{}
err := json.Unmarshal(val, &v)
if err != nil {
v = map[string]interface{}{}
}
typ := b.determineType(key, v, defaultType)
doc := BleveDocument{
typ: typ,
BleveInterface: v,
}
return &doc, err
}
func (b *BleveDocumentConfig) determineType(key []byte, v interface{}, defaultType string) string {
switch b.Mode {
case "type_field":
typ, ok := mustString(lookupPropertyPath(v, b.TypeField))
if ok {
return typ
}
case "docid_prefix":
index := bytes.Index(key, []byte(b.DocIDPrefixDelim))
if index > 0 {
return string(key[0:index])
}
case "docid_regexp":
typ := b.DocIDRegexp.Find(key)
if typ != nil {
return string(typ)
}
}
return defaultType
}
// utility functions copied from bleve/reflect.go
func lookupPropertyPath(data interface{}, path string) interface{} {
pathParts := decodePath(path)
current := data
for _, part := range pathParts {
current = lookupPropertyPathPart(current, part)
if current == nil {
break
}
}
return current
}
func lookupPropertyPathPart(data interface{}, part string) interface{} {
val := reflect.ValueOf(data)
if !val.IsValid() {
return nil
}
typ := val.Type()
switch typ.Kind() {
case reflect.Map:
// FIXME can add support for other map keys in the future
if typ.Key().Kind() == reflect.String {
if key := reflect.ValueOf(part); key.IsValid() {
entry := val.MapIndex(key)
if entry.IsValid() {
return entry.Interface()
}
}
}
case reflect.Struct:
field := val.FieldByName(part)
if field.IsValid() && field.CanInterface() {
return field.Interface()
}
}
return nil
}
const pathSeparator = "."
func decodePath(path string) []string {
return strings.Split(path, pathSeparator)
}
func mustString(data interface{}) (string, bool) {
if data != nil {
str, ok := data.(string)
if ok {
return str, true
}
}
return "", false
}