mirror of
https://github.com/go-micro/go-micro.git
synced 2024-12-18 08:26:38 +02:00
292 lines
5.7 KiB
Go
292 lines
5.7 KiB
Go
package store
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import (
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"path/filepath"
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"sort"
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"strings"
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"time"
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"github.com/patrickmn/go-cache"
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"github.com/pkg/errors"
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)
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// NewMemoryStore returns a memory store
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func NewMemoryStore(opts ...Option) Store {
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s := &memoryStore{
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options: Options{
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Database: "micro",
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Table: "micro",
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},
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store: cache.New(cache.NoExpiration, 5*time.Minute),
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}
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for _, o := range opts {
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o(&s.options)
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}
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return s
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}
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type memoryStore struct {
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options Options
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store *cache.Cache
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}
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type storeRecord struct {
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key string
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value []byte
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metadata map[string]interface{}
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expiresAt time.Time
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}
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func (m *memoryStore) key(prefix, key string) string {
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return filepath.Join(prefix, key)
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}
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func (m *memoryStore) prefix(database, table string) string {
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if len(database) == 0 {
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database = m.options.Database
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}
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if len(table) == 0 {
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table = m.options.Table
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}
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return filepath.Join(database, table)
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}
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func (m *memoryStore) get(prefix, key string) (*Record, error) {
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key = m.key(prefix, key)
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var storedRecord *storeRecord
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r, found := m.store.Get(key)
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if !found {
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return nil, ErrNotFound
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}
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storedRecord, ok := r.(*storeRecord)
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if !ok {
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return nil, errors.New("Retrieved a non *storeRecord from the cache")
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}
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// Copy the record on the way out
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newRecord := &Record{}
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newRecord.Key = strings.TrimPrefix(storedRecord.key, prefix+"/")
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newRecord.Value = make([]byte, len(storedRecord.value))
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newRecord.Metadata = make(map[string]interface{})
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// copy the value into the new record
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copy(newRecord.Value, storedRecord.value)
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// check if we need to set the expiry
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if !storedRecord.expiresAt.IsZero() {
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newRecord.Expiry = time.Until(storedRecord.expiresAt)
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}
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// copy in the metadata
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for k, v := range storedRecord.metadata {
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newRecord.Metadata[k] = v
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}
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return newRecord, nil
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}
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func (m *memoryStore) set(prefix string, r *Record) {
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key := m.key(prefix, r.Key)
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// copy the incoming record and then
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// convert the expiry in to a hard timestamp
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i := &storeRecord{}
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i.key = r.Key
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i.value = make([]byte, len(r.Value))
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i.metadata = make(map[string]interface{})
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// copy the the value
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copy(i.value, r.Value)
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// set the expiry
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if r.Expiry != 0 {
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i.expiresAt = time.Now().Add(r.Expiry)
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}
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// set the metadata
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for k, v := range r.Metadata {
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i.metadata[k] = v
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}
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m.store.Set(key, i, r.Expiry)
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}
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func (m *memoryStore) delete(prefix, key string) {
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key = m.key(prefix, key)
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m.store.Delete(key)
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}
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func (m *memoryStore) list(prefix string, limit, offset uint) []string {
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allItems := m.store.Items()
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allKeys := make([]string, len(allItems))
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i := 0
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for k := range allItems {
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if !strings.HasPrefix(k, prefix+"/") {
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continue
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}
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allKeys[i] = strings.TrimPrefix(k, prefix+"/")
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i++
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}
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if limit != 0 || offset != 0 {
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sort.Slice(allKeys, func(i, j int) bool { return allKeys[i] < allKeys[j] })
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min := func(i, j uint) uint {
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if i < j {
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return i
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}
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return j
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}
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return allKeys[offset:min(limit, uint(len(allKeys)))]
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}
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return allKeys
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}
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func (m *memoryStore) Close() error {
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m.store.Flush()
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return nil
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}
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func (m *memoryStore) Init(opts ...Option) error {
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for _, o := range opts {
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o(&m.options)
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}
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return nil
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}
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func (m *memoryStore) String() string {
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return "memory"
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}
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func (m *memoryStore) Read(key string, opts ...ReadOption) ([]*Record, error) {
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readOpts := ReadOptions{}
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for _, o := range opts {
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o(&readOpts)
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}
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prefix := m.prefix(readOpts.Database, readOpts.Table)
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var keys []string
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// Handle Prefix / suffix
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if readOpts.Prefix || readOpts.Suffix {
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k := m.list(prefix, readOpts.Limit, readOpts.Offset)
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for _, kk := range k {
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if readOpts.Prefix && !strings.HasPrefix(kk, key) {
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continue
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}
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if readOpts.Suffix && !strings.HasSuffix(kk, key) {
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continue
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}
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keys = append(keys, kk)
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}
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} else {
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keys = []string{key}
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}
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var results []*Record
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for _, k := range keys {
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r, err := m.get(prefix, k)
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if err != nil {
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return results, err
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}
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results = append(results, r)
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}
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return results, nil
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}
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func (m *memoryStore) Write(r *Record, opts ...WriteOption) error {
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writeOpts := WriteOptions{}
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for _, o := range opts {
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o(&writeOpts)
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}
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prefix := m.prefix(writeOpts.Database, writeOpts.Table)
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if len(opts) > 0 {
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// Copy the record before applying options, or the incoming record will be mutated
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newRecord := Record{}
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newRecord.Key = r.Key
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newRecord.Value = make([]byte, len(r.Value))
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newRecord.Metadata = make(map[string]interface{})
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copy(newRecord.Value, r.Value)
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newRecord.Expiry = r.Expiry
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if !writeOpts.Expiry.IsZero() {
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newRecord.Expiry = time.Until(writeOpts.Expiry)
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}
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if writeOpts.TTL != 0 {
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newRecord.Expiry = writeOpts.TTL
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}
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for k, v := range r.Metadata {
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newRecord.Metadata[k] = v
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}
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m.set(prefix, &newRecord)
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return nil
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}
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// set
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m.set(prefix, r)
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return nil
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}
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func (m *memoryStore) Delete(key string, opts ...DeleteOption) error {
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deleteOptions := DeleteOptions{}
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for _, o := range opts {
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o(&deleteOptions)
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}
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prefix := m.prefix(deleteOptions.Database, deleteOptions.Table)
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m.delete(prefix, key)
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return nil
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}
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func (m *memoryStore) Options() Options {
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return m.options
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}
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func (m *memoryStore) List(opts ...ListOption) ([]string, error) {
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listOptions := ListOptions{}
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for _, o := range opts {
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o(&listOptions)
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}
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prefix := m.prefix(listOptions.Database, listOptions.Table)
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keys := m.list(prefix, listOptions.Limit, listOptions.Offset)
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if len(listOptions.Prefix) > 0 {
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var prefixKeys []string
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for _, k := range keys {
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if strings.HasPrefix(k, listOptions.Prefix) {
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prefixKeys = append(prefixKeys, k)
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}
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}
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keys = prefixKeys
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}
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if len(listOptions.Suffix) > 0 {
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var suffixKeys []string
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for _, k := range keys {
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if strings.HasSuffix(k, listOptions.Suffix) {
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suffixKeys = append(suffixKeys, k)
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}
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}
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keys = suffixKeys
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}
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return keys, nil
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}
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