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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| // Copyright 2023 Linkall 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 meta | ||
|
|
||
| import ( | ||
| // standard libraries. | ||
| "bytes" | ||
| "context" | ||
| "errors" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
|
|
||
| // this project. | ||
| walog "github.com/vanus-labs/vanus/internal/store/wal" | ||
| ) | ||
|
|
||
| var errFound = errors.New("found") | ||
|
|
||
| type ReviewWatcher = func(value interface{}, version int64) | ||
|
|
||
| func ReviewSyncStore(ctx context.Context, dir string, key []byte, watcher ReviewWatcher, opts ...walog.Option) error { | ||
| snapshot, err := reviewLatestSnapshot(ctx, dir, defaultCodec, key, watcher) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| opts = append([]walog.Option{ | ||
| walog.FromPosition(snapshot), | ||
| walog.WithRecoveryCallback(func(data []byte, r walog.Range) error { | ||
| err2 := defaultCodec.Unmarshal(data, func(k []byte, v interface{}) error { | ||
| if bytes.Equal(k, key) { | ||
| watcher(v, r.EO) | ||
| } | ||
| return nil | ||
| }) | ||
| if err2 != nil { | ||
| return err2 | ||
| } | ||
| return nil | ||
| }), | ||
| }, opts...) | ||
| wal, err := walog.Open(ctx, dir, opts...) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| wal.Close() | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func reviewLatestSnapshot( | ||
| _ context.Context, dir string, unmarshaler Unmarshaler, key []byte, watcher ReviewWatcher, | ||
| ) (int64, error) { | ||
| files, err := os.ReadDir(dir) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| latest, _ := filterLatestSnapshot(files) | ||
|
|
||
| if latest == nil { | ||
| return 0, nil | ||
| } | ||
|
|
||
| filename := latest.Name() | ||
| snapshot, err := strconv.ParseInt(filename[:len(filename)-len(snapshotExt)], 10, 64) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| path := filepath.Join(dir, filename) | ||
| data, err := os.ReadFile(path) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
|
|
||
| err = unmarshaler.Unmarshal(data, func(k []byte, v interface{}) error { | ||
| if bytes.Equal(k, key) { | ||
| watcher(v, -1) | ||
| // TODO(james.yin): don't skip remaind data? | ||
| return errFound | ||
| } | ||
| return nil | ||
| }) | ||
| if err != nil && err != errFound { //nolint:errorlint // compare to errFound is ok. | ||
| return 0, err | ||
| } | ||
|
|
||
| return snapshot, nil | ||
| } |
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