/
page_token.go
87 lines (79 loc) · 2.71 KB
/
page_token.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package elasticsearch
import (
"bytes"
"encoding/json"
"fmt"
"github.com/uber/cadence/common/types"
)
type (
// ElasticVisibilityPageToken holds the paging token for ElasticSearch
ElasticVisibilityPageToken struct {
// for ES API From+Size
From int
// for ES API searchAfter
SortValue interface{}
TieBreaker string // runID
// for ES scroll API
ScrollID string
}
)
// DeserializePageToken return the structural token
func DeserializePageToken(data []byte) (*ElasticVisibilityPageToken, error) {
var token ElasticVisibilityPageToken
dec := json.NewDecoder(bytes.NewReader(data))
dec.UseNumber()
err := dec.Decode(&token)
if err != nil {
return nil, &types.BadRequestError{
Message: fmt.Sprintf("unable to deserialize page token. err: %v", err),
}
}
return &token, nil
}
// SerializePageToken return the token blob
func SerializePageToken(token *ElasticVisibilityPageToken) ([]byte, error) {
data, err := json.Marshal(token)
if err != nil {
return nil, &types.BadRequestError{
Message: fmt.Sprintf("unable to serialize page token. err: %v", err),
}
}
return data, nil
}
// GetNextPageToken returns the structural token with nil handling
func GetNextPageToken(token []byte) (*ElasticVisibilityPageToken, error) {
var result *ElasticVisibilityPageToken
var err error
if len(token) > 0 {
result, err = DeserializePageToken(token)
if err != nil {
return nil, err
}
} else {
result = &ElasticVisibilityPageToken{}
}
return result, nil
}
// ShouldSearchAfter decides if should search after
func ShouldSearchAfter(token *ElasticVisibilityPageToken) bool {
return token.TieBreaker != ""
}