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blobstoreWriter.go
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/
blobstoreWriter.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"
"fmt"
"github.com/uber/cadence/common/blobstore"
"github.com/uber/cadence/common/pagination"
)
type (
blobstoreWriter struct {
writer pagination.Writer
uuid string
extension Extension
}
)
// NewBlobstoreWriter constructs a new blobstore writer
func NewBlobstoreWriter(
uuid string,
extension Extension,
client blobstore.Client,
flushThreshold int,
) ExecutionWriter {
return &blobstoreWriter{
writer: pagination.NewWriter(
getBlobstoreWriteFn(uuid, extension, client),
getBlobstoreShouldFlushFn(flushThreshold),
0),
uuid: uuid,
extension: extension,
}
}
// Add adds an entity to blobstore writer
func (bw *blobstoreWriter) Add(e interface{}) error {
return bw.writer.Add(e)
}
// Flush flushes contents of writer to blobstore.
// Only triggers flush if page contains some contents.
func (bw *blobstoreWriter) Flush() error {
return bw.writer.FlushIfNotEmpty()
}
// FlushedKeys returns the keys that have been successfully flushed.
// Returns nil if no keys have been flushed.
func (bw *blobstoreWriter) FlushedKeys() *Keys {
if len(bw.writer.FlushedPages()) == 0 {
return nil
}
return &Keys{
UUID: bw.uuid,
MinPage: bw.writer.FirstFlushedPage().(int),
MaxPage: bw.writer.LastFlushedPage().(int),
Extension: bw.extension,
}
}
func getBlobstoreWriteFn(
uuid string,
extension Extension,
client blobstore.Client,
) pagination.WriteFn {
return func(page pagination.Page) (pagination.PageToken, error) {
blobIndex := page.CurrentToken.(int)
key := pageNumberToKey(uuid, extension, blobIndex)
buffer := &bytes.Buffer{}
for _, e := range page.Entities {
data, err := json.Marshal(e)
if err != nil {
return nil, err
}
buffer.Write(data)
buffer.Write(SeparatorToken)
}
req := &blobstore.PutRequest{
Key: key,
Blob: blobstore.Blob{
Body: buffer.Bytes(),
},
}
ctx, cancel := context.WithTimeout(context.Background(), Timeout)
defer cancel()
if _, err := client.Put(ctx, req); err != nil {
return nil, err
}
return blobIndex + 1, nil
}
}
func getBlobstoreShouldFlushFn(
flushThreshold int,
) pagination.ShouldFlushFn {
return func(page pagination.Page) bool {
return len(page.Entities) > flushThreshold
}
}
func pageNumberToKey(uuid string, extension Extension, pageNum int) string {
return fmt.Sprintf("%v_%v.%v", uuid, pageNum, extension)
}