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scandb.go
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scandb.go
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// Copyright 2023 cloudeng llc. All rights reserved.
// Use of this source code is governed by the Apache-2.0
// license that can be found in the LICENSE file.
package internal
import (
"bytes"
"context"
"fmt"
"log/slog"
"runtime"
"sync"
"time"
"cloudeng.io/cmd/idu/internal/config"
"cloudeng.io/cmd/idu/internal/database"
"cloudeng.io/cmd/idu/internal/database/badgerdb"
"cloudeng.io/cmd/idu/internal/prefixinfo"
"github.com/dgraph-io/badger/v4"
)
var badgerLogName = defaultLogName + "-badger"
func logDB(ctx context.Context, level slog.Level, msg string, args ...interface{}) {
if level < Verbosity {
return
}
var pcs [1]uintptr
if logSourceCode {
runtime.Callers(2, pcs[:]) // skip [Callers, infof]
}
r := slog.NewRecord(time.Now(), level, msg, pcs[0])
r.Add(args...)
_ = getOrCreateLogger(badgerLogName, ctx).Handler().Handle(ctx, r)
}
type badgerLogger struct{}
func (l *badgerLogger) Errorf(f string, a ...interface{}) {
m := fmt.Sprintf(f, a...)
logDB(context.Background(), LogError, "badger", "msg", m)
}
func (l *badgerLogger) Warningf(f string, a ...interface{}) {
m := fmt.Sprintf(f, a...)
logDB(context.Background(), slog.LevelWarn, "badger", "msg", m)
}
func (l *badgerLogger) Infof(f string, a ...interface{}) {
m := fmt.Sprintf(f, a...)
logDB(context.Background(), slog.LevelInfo, "badger", "msg", m)
}
func (l *badgerLogger) Debugf(f string, a ...interface{}) {
m := fmt.Sprintf(f, a...)
logDB(context.Background(), slog.LevelWarn, "badger", "msg", m)
}
func badgerdbOptions(readonly bool, opts ...badgerdb.Option) []badgerdb.Option {
if readonly {
opts = append(opts, badgerdb.ReadOnly())
}
return opts
}
func openBadgerDB(ctx context.Context, cfg config.Prefix, readonly bool) (database.DB, error) {
opts := badgerdbOptions(readonly)
bopts := badger.DefaultOptions(cfg.Database)
bopts = bopts.WithLogger(&badgerLogger{})
bopts = bopts.WithLoggingLevel(badger.ERROR)
opts = append(opts, badgerdb.WithBadgerOptions(bopts))
return badgerdb.Open(cfg.Database, opts...)
}
func UseBadgerDB() {
databaseFactory = openBadgerDB
}
var databaseFactory = openBadgerDB
func OpenDatabase(ctx context.Context, cfg config.Prefix, readonly bool) (database.DB, error) {
doneCh := make(chan struct {
db database.DB
err error
}, 1)
go func() {
db, err := databaseFactory(ctx, cfg, readonly)
doneCh <- struct {
db database.DB
err error
}{db, err}
}()
start := time.Now()
delayed := false
for {
select {
case <-ctx.Done():
return nil, ctx.Err()
case res := <-doneCh:
if delayed {
fmt.Println()
}
return res.db, res.err
case <-time.After(time.Second):
fmt.Printf("waiting for database to open: %v: %s\t\t\r", cfg.Database, time.Since(start).Truncate(time.Second))
delayed = true
}
}
}
func OpenPrefixAndDatabase(ctx context.Context, all config.T, prefix string, readonly bool) (context.Context, config.Prefix, database.DB, error) {
ctx, cfg, err := LookupPrefix(ctx, all, prefix)
if err != nil {
return ctx, config.Prefix{}, nil, err
}
db, err := OpenDatabase(ctx, cfg, readonly)
if err != nil {
return ctx, config.Prefix{}, nil, fmt.Errorf("failed to open database for %v in %v: %v\n", cfg.Prefix, cfg.Database, err)
}
return ctx, cfg, db, nil
}
type ScanDB interface {
GetPrefixInfo(ctx context.Context, key string, pi *prefixinfo.T) (bool, error)
SetPrefixInfo(ctx context.Context, key string, unchanged bool, pi *prefixinfo.T) error
LogError(ctx context.Context, key string, when time.Time, detail []byte) error
LogAndClose(ctx context.Context, start, stop time.Time, detail []byte) error
DeletePrefix(ctx context.Context, prefix string) error
DeleteErrors(ctx context.Context, prefix string) error
Close(ctx context.Context) error
}
type scanDB struct {
db database.DB
}
func NewScanDB(ctx context.Context, cfg config.Prefix) (ScanDB, error) {
db, err := OpenDatabase(ctx, cfg, false)
if err != nil {
return nil, err
}
return &scanDB{
db: db,
}, nil
}
func (sdb *scanDB) LogError(ctx context.Context, key string, when time.Time, detail []byte) error {
return sdb.db.LogError(ctx, key, when, detail)
}
func (sdb *scanDB) LogAndClose(ctx context.Context, start, stop time.Time, detail []byte) error {
if err := sdb.db.Log(ctx, start, stop, detail); err != nil {
return err
}
if err := sdb.db.Close(ctx); err != nil {
return err
}
return nil
}
func (sdb *scanDB) DeletePrefix(ctx context.Context, prefix string) error {
return sdb.db.DeletePrefix(ctx, prefix)
}
func (sdb *scanDB) DeleteErrors(ctx context.Context, prefix string) error {
return sdb.db.DeleteErrors(ctx, prefix)
}
func (sdb *scanDB) GetPrefixInfo(ctx context.Context, key string, pi *prefixinfo.T) (bool, error) {
select {
case <-ctx.Done():
return false, ctx.Err()
default:
}
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
if err := sdb.db.Get(ctx, key, buf); err != nil {
return false, err
}
if len(buf.Bytes()) == 0 {
// Key does not exist or is a bucket, which should never happen here.
return false, nil
}
return true, pi.UnmarshalBinary(buf.Bytes())
}
func (sdb *scanDB) SetPrefixInfo(ctx context.Context, key string, unchanged bool, pi *prefixinfo.T) error {
if unchanged {
return nil
}
select {
case <-ctx.Done():
return ctx.Err()
default:
}
buf := bufPool.Get().(*bytes.Buffer)
buf.Reset()
defer bufPool.Put(buf)
if err := pi.AppendBinary(buf); err != nil {
return err
}
return sdb.db.Set(ctx, key, buf.Bytes(), true)
}
func (sdb *scanDB) Close(ctx context.Context) error {
return sdb.db.Close(ctx)
}
var bufPool = sync.Pool{
New: func() any {
// The Pool's New function should generally only return pointer
// types, since a pointer can be put into the return interface
// value without an allocation:
return new(bytes.Buffer)
},
}