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sqlite.go
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sqlite.go
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package timeline
import (
"context"
"encoding/json"
"fmt"
"log"
"os"
"path"
"time"
"github.com/glebarez/sqlite"
sparse "github.com/nnikolash/go-sparse"
"github.com/pkg/errors"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
type SqliteCacheOptions[Data any, Key any, ID comparable] struct {
CacheDir string // (Required) Directory to store cache files
GetTimestamp func(d *Data) time.Time // (Required) Get timestamp of data entry
GetID func(d *Data) ID // (Required) Get ID of data entry. Needed to properly order data in DB if timestamp is not unique.
GetFromSource CacheSource[Data, Key] // (Required) Fetch data from source
KeyToStr func(Key) string // (Optional) Convert key to string
SkipDataVerification bool
}
func NewSqliteCache[Data any, Key any, ID comparable](opts SqliteCacheOptions[Data, Key, ID]) (*SqliteCache[Data, Key, ID], error) {
if opts.KeyToStr == nil {
opts.KeyToStr = CreateConvertorToString[Key]()
}
if err := os.MkdirAll(opts.CacheDir, 0755); err != nil && !os.IsExist(err) {
return nil, errors.Wrapf(err, "failed to create cache directory %v", opts.CacheDir)
}
return &SqliteCache[Data, Key, ID]{
CacheBase: *NewCacheBase[Data, Key](CacheBaseOptions[Data, Key]{
KeyToStr: opts.KeyToStr,
GetTimestamp: opts.GetTimestamp,
GetFromSource: opts.GetFromSource,
Storage: &sqliteCacheStorage[Data, Key, ID]{
cacheDir: opts.CacheDir,
getID: opts.GetID,
getTimestamp: opts.GetTimestamp,
keyToStr: opts.KeyToStr,
connections: make(map[string]*gorm.DB),
},
SkipDataVerification: opts.SkipDataVerification,
}),
}, nil
}
type SqliteCache[Data any, Key any, ID comparable] struct {
CacheBase[Data, Key]
}
var _ Cache[struct{}, int64] = &SqliteCache[struct{}, int64, string]{}
type sqliteCacheStorage[Data any, Key any, ID comparable] struct {
cacheDir string
getID func(d *Data) ID
getTimestamp func(d *Data) time.Time
keyToStr func(Key) string
connections map[string]*gorm.DB
}
var _ CacheStorage[struct{}, int64] = &sqliteCacheStorage[struct{}, int64, string]{}
func (c *sqliteCacheStorage[Data, Key, ID]) Load(key Key) (*CacheState[Data], error) {
segments, err := c.getAllSegmentsFromDB(key)
if err != nil {
return nil, err
}
stateSegments := make([]*sparse.SeriesSegmentFields[Data, time.Time], 0, len(segments))
for _, segment := range segments {
stateSegments = append(stateSegments, &sparse.SeriesSegmentFields[Data, time.Time]{
PeriodBounds: sparse.PeriodBounds[time.Time]{
PeriodStart: segment.Start,
PeriodEnd: segment.End,
},
Data: newSqliteCacheData[Data](key, c),
Empty: segment.IsEmpty,
})
}
return &CacheState[Data]{
Segments: stateSegments,
}, nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) Save(key Key, state *CacheState[Data], updated []*CacheStateSegment[Data]) error {
segments := make([]dbSegmentT, 0, len(state.Segments))
for _, segment := range state.Segments {
segments = append(segments, dbSegmentT{
Start: segment.PeriodStart,
End: segment.PeriodEnd,
IsEmpty: segment.Empty,
})
}
return c.saveSegmentsToDB(key, segments)
}
func (c *sqliteCacheStorage[Data, Key, ID]) Add(key Key, periodStart, periodEnd time.Time, data []Data) (CacheData[Data], error) {
if err := c.saveDataToDB(key, data); err != nil {
return nil, err
}
return newSqliteCacheData[Data](key, c), nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) cacheFilePath(key Key) string {
return path.Join(c.cacheDir, fmt.Sprintf("sqlite_timeline_cache_%v.db", key))
}
func (c *sqliteCacheStorage[Data, Key, ID]) getConn(key Key) (*gorm.DB, error) {
keyStr := c.keyToStr(key)
db, connOpen := c.connections[keyStr]
if connOpen {
return db, nil
}
dbFilePath := c.cacheFilePath(key)
var err error
db, err = gorm.Open(sqlite.Open(dbFilePath), &gorm.Config{
Logger: &loggerWithFilename{
l: logger.Default.LogMode(logger.Warn),
filename: dbFilePath,
},
})
if err != nil {
return nil, errors.Wrapf(err, "failed to open db file %v", c.cacheFilePath(key))
}
if err := db.AutoMigrate(&dbSegmentT{}, &dbDataT[ID]{}); err != nil {
return nil, errors.Wrapf(err, "failed to migrate db schema")
}
c.connections[keyStr] = db // TODO: pool with ttl
return db, nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) dbRequest(key Key, request func(db *gorm.DB) error) error {
db, err := c.getConn(key)
if err != nil {
return err
}
return db.Transaction(func(tx *gorm.DB) error {
if err := request(tx); err != nil {
return errors.Wrapf(err, "failed to execute db request")
}
return nil
})
}
type dbSegmentT struct {
Start time.Time `gorm:"index"`
End time.Time
IsEmpty bool
}
func (c *sqliteCacheStorage[Data, Key, ID]) getAllSegmentsFromDB(key Key) ([]dbSegmentT, error) {
var segments []dbSegmentT
if err := c.dbRequest(key, func(db *gorm.DB) error {
return db.Order("start ASC").Find(&segments).Error
}); err != nil {
return nil, err
}
return segments, nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) saveSegmentsToDB(key Key, segments []dbSegmentT) error {
// TODO: what is there is more than 999 segments? We cant use batching here...
for i := range segments {
segments[i].Start = segments[i].Start.UTC()
segments[i].End = segments[i].End.UTC()
}
return c.dbRequest(key, func(db *gorm.DB) error {
if err := db.Where("1 = 1").Delete(&dbSegmentT{}).Error; err != nil {
return errors.Wrapf(err, "failed to delete segments from db for key %v", key)
}
if err := db.Save(segments).Error; err != nil {
return errors.Wrapf(err, "failed to save segments to db for key %v", key)
}
return nil
})
}
func (c *sqliteCacheStorage[Data, Key, ID]) getRangeFromDB(key Key, from, to time.Time) ([]Data, error) {
var data []dbDataT[ID]
if err := c.dbRequest(key, func(db *gorm.DB) error {
return db.Where("date >= ? AND date <= ?", from.UTC(), to.UTC()).Order("date ASC, id asc").Find(&data).Error
}); err != nil {
return nil, err
}
decoded := make([]Data, len(data))
for i := range data {
if err := json.Unmarshal(data[i].Content, &decoded[i]); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal data content")
}
}
return decoded, nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) getOneFromDB(key Key, getLast bool, query interface{}, args ...interface{}) (*Data, error) {
order := "ASC"
if getLast {
order = "DESC"
}
var data []dbDataT[ID]
if err := c.dbRequest(key, func(db *gorm.DB) error {
return db.Where(query, args...).Order("date " + order + ", id " + order).Limit(1).Find(&data).Error
}); err != nil {
return nil, err
}
if len(data) == 0 {
return nil, nil
}
if len(data) > 1 {
return nil, errors.Errorf("unexpected number of db entries: %v", len(data))
}
var decoded Data
if err := json.Unmarshal(data[0].Content, &decoded); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal data content")
}
return &decoded, nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) getFirstFromDB(key Key, t time.Time) (*Data, error) {
return c.getOneFromDB(key, false, "date >= ?", t.UTC())
}
func (c *sqliteCacheStorage[Data, Key, ID]) getLastFromDB(key Key, t time.Time) (*Data, error) {
return c.getOneFromDB(key, true, "date <= ?", t.UTC())
}
func (c *sqliteCacheStorage[Data, Key, ID]) saveDataToDB(key Key, data []Data) error {
encoded := make([]dbDataT[ID], 0, len(data))
for i := range data {
j, err := json.Marshal(data[i])
if err != nil {
return errors.Wrapf(err, "failed to marshal data content")
}
encoded = append(encoded, dbDataT[ID]{
ID: c.getID(&data[i]),
Date: c.getTimestamp(&data[i]).UTC(),
Content: j,
})
}
const batchSize = 500
for i := 0; i < len(encoded); i += batchSize {
batch := encoded[i:min(i+batchSize, len(encoded))]
if err := c.dbRequest(key, func(db *gorm.DB) error {
return db.Save(batch).Error
}); err != nil {
return err
}
}
return nil
}
func (c *sqliteCacheStorage[Data, Key, ID]) Close() {
for _, db := range c.connections {
sqlDB, err := db.DB()
if err != nil {
continue
}
if _, err := sqlDB.Exec("PRAGMA optimize"); err != nil {
log.Printf("ERROR: Failed to optimize db %v: %v", db.Name(), err)
}
sqlDB.Close()
}
}
type dbDataT[ID comparable] struct {
ID ID `gorm:"primaryKey;autoIncrement:false;index:sort,priority:2"`
Date time.Time `gorm:"index:sort,priority:1"`
Content []byte
}
func newSqliteCacheData[Data any, Key any, ID comparable](key Key, storage *sqliteCacheStorage[Data, Key, ID]) *sqliteCacheData[Data, Key, ID] {
return &sqliteCacheData[Data, Key, ID]{
key: key,
storage: storage,
}
}
type sqliteCacheData[Data any, Key any, ID comparable] struct {
storage *sqliteCacheStorage[Data, Key, ID]
key Key
}
var _ CacheData[struct{}] = &sqliteCacheData[struct{}, string, int64]{}
func (d *sqliteCacheData[Data, Key, ID]) Get(periodStart, periodEnd time.Time) ([]Data, error) {
return d.storage.getRangeFromDB(d.key, periodStart, periodEnd)
}
func (d *sqliteCacheData[Data, Key, ID]) GetEndOpen(periodStart, periodEnd time.Time) ([]Data, error) {
return d.storage.getRangeFromDB(d.key, periodStart, periodEnd.Add(time.Nanosecond))
}
func (d *sqliteCacheData[Data, Key, ID]) Merge(data []Data) error {
if len(data) == 0 {
return nil
}
if err := d.storage.saveDataToDB(d.key, data); err != nil {
return err
}
return nil
}
func (d *sqliteCacheData[Data, Key, ID]) First(idx time.Time) (*Data, error) {
return d.storage.getFirstFromDB(d.key, idx)
}
func (d *sqliteCacheData[Data, Key, ID]) Last(idx time.Time) (*Data, error) {
return d.storage.getLastFromDB(d.key, idx)
}
type loggerWithFilename struct {
l logger.Interface
filename string
}
var _ logger.Interface = &loggerWithFilename{}
func (l *loggerWithFilename) LogMode(level logger.LogLevel) logger.Interface {
return &loggerWithFilename{
l: l.l.LogMode(level),
filename: l.filename,
}
}
func (l *loggerWithFilename) Info(ctx context.Context, msg string, data ...interface{}) {
l.l.Info(ctx, fmt.Sprintf("%v: %v", l.filename, msg), data...)
}
func (l *loggerWithFilename) Warn(ctx context.Context, msg string, data ...interface{}) {
// TODO: wtf? why is it not used?
l.l.Warn(ctx, fmt.Sprintf("%v: %v", l.filename, msg), data...)
}
func (l *loggerWithFilename) Error(ctx context.Context, msg string, data ...interface{}) {
l.l.Error(ctx, fmt.Sprintf("%v: %v", l.filename, msg), data...)
}
func (l *loggerWithFilename) Trace(ctx context.Context, begin time.Time, fc func() (string, int64), err error) {
l.l.Trace(ctx, begin, fc, err)
}