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token_writers.go
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187 lines (159 loc) · 4.7 KB
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// Copyright 2024 Aerospike, 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 backup
import (
"bytes"
"errors"
"fmt"
"io"
"log/slog"
"github.com/aerospike/backup-go/internal/logging"
"github.com/aerospike/backup-go/models"
"github.com/aerospike/backup-go/pipe"
"github.com/google/uuid"
)
// statsSetterToken is an interface for setting the stats of a backup job.
//
//go:generate mockery --name statsSetterToken --inpackage --exported=false
type statsSetterToken interface {
AddUDFs(uint32)
AddSIndexes(uint32)
}
// tokenStatsWriter is used to count UDFs and SIndexes.
type tokenStatsWriter[T models.TokenConstraint] struct {
writer pipe.Writer[T]
stats statsSetterToken
logger *slog.Logger
}
func newWriterWithTokenStats[T models.TokenConstraint](
writer pipe.Writer[T],
stats statsSetterToken,
logger *slog.Logger,
) *tokenStatsWriter[T] {
id := uuid.NewString()
logger = logging.WithWriter(logger, id, logging.WriterTypeTokenStats)
logger.Debug("created new token stats writer")
return &tokenStatsWriter[T]{
writer: writer,
stats: stats,
logger: logger,
}
}
func (tw *tokenStatsWriter[T]) Write(data T) (int, error) {
n, err := tw.writer.Write(data)
if err != nil {
return 0, err
}
// We set stats only for ASB Tokens at the moment.
t, ok := any(data).(*models.Token)
if ok {
switch t.Type {
case models.TokenTypeRecord:
case models.TokenTypeUDF:
tw.stats.AddUDFs(1)
case models.TokenTypeSIndex:
tw.stats.AddSIndexes(1)
case models.TokenTypeInvalid:
return 0, errors.New("invalid token")
}
}
return n, nil
}
func (tw *tokenStatsWriter[T]) Close() error {
return tw.writer.Close()
}
// tokenWriter satisfies the DataWriter interface.
// It writes the types from the models package as encoded data
// to an io.Writer. It uses an Encoder to encode the data.
type tokenWriter[T models.TokenConstraint] struct {
encoder Encoder[T]
output io.WriteCloser
logger *slog.Logger
stateInfo *stateInfo
buf bytes.Buffer
}
type stateInfo struct {
// Channel to send save signal.
recordsStateChan chan<- models.PartitionFilterSerialized
// Number of writer.
n int
}
func newStateInfo(recordsStateChan chan<- models.PartitionFilterSerialized, n int) *stateInfo {
return &stateInfo{
recordsStateChan: recordsStateChan,
n: n,
}
}
// newTokenWriter creates a new tokenWriter.
func newTokenWriter[T models.TokenConstraint](
encoder Encoder[T],
output io.WriteCloser,
logger *slog.Logger,
stateInfo *stateInfo,
) *tokenWriter[T] {
id := uuid.NewString()
logger = logging.WithWriter(logger, id, logging.WriterTypeToken)
logger.Debug("created new token writer")
return &tokenWriter[T]{
encoder: encoder,
output: output,
logger: logger,
stateInfo: stateInfo,
}
}
// Write encodes v and writes it to the output.
func (w *tokenWriter[T]) Write(v T) (int, error) {
w.buf.Reset()
if err := w.encoder.EncodeToken(v, &w.buf); err != nil {
return 0, fmt.Errorf("failed to encode token: %w", err)
}
// We set state only for ASB Tokens at the moment.
t, ok := any(v).(*models.Token)
if ok {
if w.stateInfo != nil && t.Filter != nil {
// Set a worker number.
t.Filter.N = w.stateInfo.n
w.stateInfo.recordsStateChan <- *t.Filter
}
}
return w.output.Write(w.buf.Bytes())
}
// Close releases resources associated with the tokenWriter and ensures the underlying writer is properly closed.
func (w *tokenWriter[T]) Close() error {
w.logger.Debug("try to close token writer")
if err := w.output.Close(); err != nil {
return fmt.Errorf("failed to close token writer: %w", err)
}
w.logger.Debug("closed token writer")
return nil
}
// noCloseWriter wraps an io.Writer and provides a no-op Close method.
// It is used when writing UDF and SIndexes to the first file.
type noCloseWriter struct {
writer io.Writer
}
// newNoCloseWriter wraps an io.Writer, disabling the Close operation while preserving Write functionality.
func newNoCloseWriter(w io.Writer) io.WriteCloser {
return &noCloseWriter{
writer: w,
}
}
// Write writes bytes to the underlying writer.
func (w *noCloseWriter) Write(p []byte) (n int, err error) {
return w.writer.Write(p)
}
// Close is a no-op for noCloseWriter.
func (w *noCloseWriter) Close() error {
return nil
}