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mem.go
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mem.go
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package http
import (
"context"
"strconv"
"sync"
"time"
"github.com/burlingtonbertie99/mykeys/tsutil"
"github.com/pkg/errors"
)
// Mem is a in memory key value store.
type Mem struct {
sync.Mutex
kv map[string]*entry
clock tsutil.Clock
}
// NonceCheck ...
func (m *Mem) NonceCheck(ctx context.Context, nonce string) error {
val, err := m.Get(ctx, nonce)
if err != nil {
return err
}
if val != "" {
return errors.Errorf("nonce collision")
}
if err := m.Set(ctx, nonce, "1"); err != nil {
return err
}
if err := m.Expire(ctx, nonce, time.Hour); err != nil {
return err
}
return nil
}
// NewMem creates a Mem key value store.
func NewMem(clock tsutil.Clock) *Mem {
return &Mem{
kv: map[string]*entry{},
clock: clock,
}
}
type entry struct {
Value string
Expire time.Time
}
// Get ...
func (m *Mem) Get(ctx context.Context, k string) (string, error) {
m.Lock()
defer m.Unlock()
e, err := m.get(ctx, k)
if err != nil {
return "", err
}
if e == nil {
return "", nil
}
return e.Value, nil
}
func (m *Mem) get(ctx context.Context, k string) (*entry, error) {
e, ok := m.kv[k]
if !ok {
return nil, nil
}
if e.Expire.IsZero() {
return e, nil
}
now := m.clock.Now()
if e.Expire.Equal(now) || now.After(e.Expire) {
return nil, nil
}
return e, nil
}
// Expire ...
func (m *Mem) Expire(ctx context.Context, k string, dt time.Duration) error {
m.Lock()
defer m.Unlock()
t := m.clock.Now()
t = t.Add(dt)
e, err := m.get(ctx, k)
if err != nil {
return err
}
e.Expire = t
return m.set(ctx, k, e)
}
// Delete ..
func (m *Mem) Delete(ctx context.Context, k string) error {
m.Lock()
defer m.Unlock()
delete(m.kv, k)
return nil
}
// Set ...
func (m *Mem) Set(ctx context.Context, k string, v string) error {
m.Lock()
defer m.Unlock()
return m.set(ctx, k, &entry{Value: v})
}
func (m *Mem) set(ctx context.Context, k string, e *entry) error {
m.kv[k] = e
return nil
}
// Increment ...
func (m *Mem) Increment(ctx context.Context, k string) (int64, error) {
m.Lock()
defer m.Unlock()
e, err := m.get(ctx, k)
if err != nil {
return 0, err
}
n, err := strconv.ParseInt(e.Value, 10, 64)
if err != nil {
return 0, err
}
n++
inc := strconv.FormatInt(n, 10)
e.Value = inc
return n, m.set(ctx, k, e)
}