Let bolt do locking per each List Get etc op, instead of managing fil… (#1831)

This commit is contained in:
Janos Dobronszki 2020-07-14 10:35:46 +02:00 committed by GitHub
parent 0a79db498c
commit 3f4b58b58c
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@ -7,7 +7,6 @@ import (
"path/filepath"
"sort"
"strings"
"sync"
"time"
"github.com/micro/go-micro/v2/store"
@ -29,9 +28,7 @@ var (
// NewStore returns a memory store
func NewStore(opts ...store.Option) store.Store {
s := &fileStore{
handles: make(map[string]*fileHandle),
}
s := &fileStore{}
s.init(opts...)
return s
}
@ -39,10 +36,6 @@ func NewStore(opts ...store.Option) store.Store {
type fileStore struct {
options store.Options
dir string
// the database handle
sync.RWMutex
handles map[string]*fileHandle
}
type fileHandle struct {
@ -62,8 +55,8 @@ func key(database, table string) string {
return database + ":" + table
}
func (m *fileStore) delete(fd *fileHandle, key string) error {
return fd.db.Update(func(tx *bolt.Tx) error {
func (m *fileStore) delete(db *bolt.DB, key string) error {
return db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(dataBucket))
if b == nil {
return nil
@ -96,7 +89,7 @@ func (m *fileStore) init(opts ...store.Option) error {
return nil
}
func (f *fileStore) getDB(database, table string) (*fileHandle, error) {
func (f *fileStore) getDB(database, table string) (*bolt.DB, error) {
if len(database) == 0 {
database = f.options.Database
}
@ -104,23 +97,6 @@ func (f *fileStore) getDB(database, table string) (*fileHandle, error) {
table = f.options.Table
}
k := key(database, table)
f.RLock()
fd, ok := f.handles[k]
f.RUnlock()
// return the file handle
if ok {
return fd, nil
}
// double check locking
f.Lock()
defer f.Unlock()
if fd, ok := f.handles[k]; ok {
return fd, nil
}
// create a directory /tmp/micro
dir := filepath.Join(DefaultDir, database)
// create the database handle
@ -132,23 +108,13 @@ func (f *fileStore) getDB(database, table string) (*fileHandle, error) {
// create new db handle
// Bolt DB only allows one process to open the file R/W so make sure we're doing this under a lock
db, err := bolt.Open(dbPath, 0700, &bolt.Options{Timeout: 5 * time.Second})
if err != nil {
return nil, err
}
fd = &fileHandle{
key: k,
db: db,
}
f.handles[k] = fd
return fd, nil
return bolt.Open(dbPath, 0700, &bolt.Options{Timeout: 5 * time.Second})
}
func (m *fileStore) list(fd *fileHandle, limit, offset uint) []string {
func (m *fileStore) list(db *bolt.DB, limit, offset uint) []string {
var allItems []string
fd.db.View(func(tx *bolt.Tx) error {
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(dataBucket))
// nothing to read
if b == nil {
@ -199,10 +165,10 @@ func (m *fileStore) list(fd *fileHandle, limit, offset uint) []string {
return allKeys
}
func (m *fileStore) get(fd *fileHandle, k string) (*store.Record, error) {
func (m *fileStore) get(db *bolt.DB, k string) (*store.Record, error) {
var value []byte
fd.db.View(func(tx *bolt.Tx) error {
db.View(func(tx *bolt.Tx) error {
// @todo this is still very experimental...
b := tx.Bucket([]byte(dataBucket))
if b == nil {
@ -242,7 +208,7 @@ func (m *fileStore) get(fd *fileHandle, k string) (*store.Record, error) {
return newRecord, nil
}
func (m *fileStore) set(fd *fileHandle, r *store.Record) error {
func (m *fileStore) set(db *bolt.DB, r *store.Record) error {
// copy the incoming record and then
// convert the expiry in to a hard timestamp
item := &record{}
@ -261,7 +227,7 @@ func (m *fileStore) set(fd *fileHandle, r *store.Record) error {
// marshal the data
data, _ := json.Marshal(item)
return fd.db.Update(func(tx *bolt.Tx) error {
return db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(dataBucket))
if b == nil {
var err error
@ -275,12 +241,6 @@ func (m *fileStore) set(fd *fileHandle, r *store.Record) error {
}
func (f *fileStore) Close() error {
f.Lock()
defer f.Unlock()
for k, v := range f.handles {
v.db.Close()
delete(f.handles, k)
}
return nil
}
@ -294,12 +254,13 @@ func (m *fileStore) Delete(key string, opts ...store.DeleteOption) error {
o(&deleteOptions)
}
fd, err := m.getDB(deleteOptions.Database, deleteOptions.Table)
db, err := m.getDB(deleteOptions.Database, deleteOptions.Table)
if err != nil {
return err
}
defer db.Close()
return m.delete(fd, key)
return m.delete(db, key)
}
func (m *fileStore) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
@ -308,10 +269,11 @@ func (m *fileStore) Read(key string, opts ...store.ReadOption) ([]*store.Record,
o(&readOpts)
}
fd, err := m.getDB(readOpts.Database, readOpts.Table)
db, err := m.getDB(readOpts.Database, readOpts.Table)
if err != nil {
return nil, err
}
defer db.Close()
var keys []string
@ -319,7 +281,7 @@ func (m *fileStore) Read(key string, opts ...store.ReadOption) ([]*store.Record,
// TODO: do range scan here rather than listing all keys
if readOpts.Prefix || readOpts.Suffix {
// list the keys
k := m.list(fd, readOpts.Limit, readOpts.Offset)
k := m.list(db, readOpts.Limit, readOpts.Offset)
// check for prefix and suffix
for _, v := range k {
@ -338,7 +300,7 @@ func (m *fileStore) Read(key string, opts ...store.ReadOption) ([]*store.Record,
var results []*store.Record
for _, k := range keys {
r, err := m.get(fd, k)
r, err := m.get(db, k)
if err != nil {
return results, err
}
@ -354,10 +316,11 @@ func (m *fileStore) Write(r *store.Record, opts ...store.WriteOption) error {
o(&writeOpts)
}
fd, err := m.getDB(writeOpts.Database, writeOpts.Table)
db, err := m.getDB(writeOpts.Database, writeOpts.Table)
if err != nil {
return err
}
defer db.Close()
if len(opts) > 0 {
// Copy the record before applying options, or the incoming record will be mutated
@ -378,10 +341,10 @@ func (m *fileStore) Write(r *store.Record, opts ...store.WriteOption) error {
newRecord.Metadata[k] = v
}
return m.set(fd, &newRecord)
return m.set(db, &newRecord)
}
return m.set(fd, r)
return m.set(db, r)
}
func (m *fileStore) Options() store.Options {
@ -395,13 +358,14 @@ func (m *fileStore) List(opts ...store.ListOption) ([]string, error) {
o(&listOptions)
}
fd, err := m.getDB(listOptions.Database, listOptions.Table)
db, err := m.getDB(listOptions.Database, listOptions.Table)
if err != nil {
return nil, err
}
defer db.Close()
// TODO apply prefix/suffix in range query
allKeys := m.list(fd, listOptions.Limit, listOptions.Offset)
allKeys := m.list(db, listOptions.Limit, listOptions.Offset)
if len(listOptions.Prefix) > 0 {
var prefixKeys []string