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replication.go
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replication.go
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// Copyright 2023 Linka Cloud All rights reserved.
//
// 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 replication
import (
"context"
"github.com/dgraph-io/badger/v3"
"google.golang.org/grpc"
"go.linka.cloud/protodb/internal/db/pending"
)
// MaxMsgSize is the maximum message size accepted by the gRPC server.
// It should be 4MiB, but we set it to 4MB to avoid exceeding the allowed size
const MaxMsgSize = 4 * 1000 * 1000
const (
ModeNone Mode = iota
ModeAsync
ModeSync
)
type Mode uint8
func (m Mode) String() string {
switch m {
case ModeAsync:
return "async"
case ModeSync:
return "sync"
default:
return "unknown"
}
}
type Replication interface {
IsLeader() bool
LeaderConn() (grpc.ClientConnInterface, bool)
CurrentLeader() string
Subscribe() <-chan string
LinearizableReads() bool
NewTx(ctx context.Context) (Tx, error)
Close() error
}
type Tx interface {
Iterator(tx *badger.Txn, readTs uint64, opt badger.IteratorOptions) pending.Iterator
New(ctx context.Context, readTs uint64) error
Set(ctx context.Context, key, value []byte, expiresAt uint64) error
Delete(ctx context.Context, key []byte) error
Commit(ctx context.Context, at uint64) error
Close(ctx context.Context) error
}