micro/store/memory/memory.go

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// Package memory is a in-memory store store
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package memory
import (
"sync"
"time"
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"github.com/micro/go-micro/config/options"
"github.com/micro/go-micro/store"
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)
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type memoryStore struct {
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options.Options
sync.RWMutex
values map[string]*memoryRecord
}
type memoryRecord struct {
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r *store.Record
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c time.Time
}
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func (m *memoryStore) Dump() ([]*store.Record, error) {
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m.RLock()
defer m.RUnlock()
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var values []*store.Record
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for _, v := range m.values {
// get expiry
d := v.r.Expiry
t := time.Since(v.c)
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if d > time.Duration(0) {
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// expired
if t > d {
continue
}
// update expiry
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v.r.Expiry -= t
v.c = time.Now()
}
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values = append(values, v.r)
}
return values, nil
}
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func (m *memoryStore) Read(key string) (*store.Record, error) {
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m.RLock()
defer m.RUnlock()
v, ok := m.values[key]
if !ok {
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return nil, store.ErrNotFound
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}
// get expiry
d := v.r.Expiry
t := time.Since(v.c)
// expired
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if d > time.Duration(0) {
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if t > d {
return nil, store.ErrNotFound
}
// update expiry
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v.r.Expiry -= t
v.c = time.Now()
}
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return v.r, nil
}
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func (m *memoryStore) Write(r *store.Record) error {
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m.Lock()
defer m.Unlock()
// set the record
m.values[r.Key] = &memoryRecord{
r: r,
c: time.Now(),
}
return nil
}
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func (m *memoryStore) Delete(key string) error {
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m.Lock()
defer m.Unlock()
// delete the value
delete(m.values, key)
return nil
}
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// NewStore returns a new store.Store
func NewStore(opts ...options.Option) store.Store {
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options := options.NewOptions(opts...)
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return &memoryStore{
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Options: options,
values: make(map[string]*memoryRecord),
}
}