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blobstoreIterator.go
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blobstoreIterator.go
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// The MIT License (MIT)
//
// 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 store
import (
"bytes"
"context"
"encoding/json"
"github.com/uber/cadence/common/blobstore"
"github.com/uber/cadence/common/pagination"
"github.com/uber/cadence/common/reconciliation/entity"
)
type (
blobstoreIterator struct {
itr pagination.Iterator
}
)
// NewBlobstoreIterator constructs a new iterator backed by blobstore.
func NewBlobstoreIterator(
ctx context.Context,
client blobstore.Client,
keys Keys,
entity entity.Entity,
) ScanOutputIterator {
return &blobstoreIterator{
itr: pagination.NewIterator(ctx, keys.MinPage, getBlobstoreFetchPageFn(client, keys, entity)),
}
}
// Next returns the next ScanOutputEntity
func (i *blobstoreIterator) Next() (*ScanOutputEntity, error) {
exec, err := i.itr.Next()
if exec != nil {
return exec.(*ScanOutputEntity), err
}
return nil, err
}
// HasNext returns true if there is a next ScanOutputEntity false otherwise
func (i *blobstoreIterator) HasNext() bool {
return i.itr.HasNext()
}
func getBlobstoreFetchPageFn(
client blobstore.Client,
keys Keys,
entity entity.Entity,
) pagination.FetchFn {
return func(ctx context.Context, token pagination.PageToken) (pagination.Page, error) {
index := token.(int)
key := pageNumberToKey(keys.UUID, keys.Extension, index)
req := &blobstore.GetRequest{
Key: key,
}
resp, err := client.Get(ctx, req)
if err != nil {
return pagination.Page{}, err
}
parts := bytes.Split(resp.Blob.Body, SeparatorToken)
var executions []pagination.Entity
for _, p := range parts {
if len(p) == 0 {
continue
}
soe, err := deserialize(p, entity)
if err != nil {
return pagination.Page{}, err
}
executions = append(executions, soe)
}
var nextPageToken interface{} = index + 1
if nextPageToken.(int) > keys.MaxPage {
nextPageToken = nil
}
return pagination.Page{
CurrentToken: token,
NextToken: nextPageToken,
Entities: executions,
}, nil
}
}
func deserialize(data []byte, blob entity.Entity) (*ScanOutputEntity, error) {
soe := &ScanOutputEntity{
Execution: blob.Clone(),
}
if err := json.Unmarshal(data, soe); err != nil {
return nil, err
}
if err := soe.Execution.(entity.Entity).Validate(); err != nil {
return nil, err
}
return soe, nil
}