91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
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package main
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/mediocregopher/radix/v4"
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)
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var errKeyCollision = errors.New("key collision")
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var errKeyNotFound = fmt.Errorf("key %w", errNotFound)
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type store interface {
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put(key string, data []byte, expire time.Duration) error
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get(key string) ([]byte, error)
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}
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type redisStore struct {
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client radixDoer
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}
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type radixDoer interface {
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Do(context.Context, radix.Action) error
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Close() error
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}
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func newRedisStore(connection string) (*redisStore, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
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defer cancel()
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connectionParts := strings.SplitN(connection, ":", 2)
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rtype := connectionParts[0]
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var client radixDoer
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var err error
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if rtype == "simple" {
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client, err = (radix.PoolConfig{}).New(ctx, "tcp", connectionParts[1])
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if err != nil {
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return nil, nil
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}
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} else if rtype == "cluster" {
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clusterAddrs := strings.Split(connectionParts[1], ",")
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client, err = (radix.ClusterConfig{}).New(ctx, clusterAddrs)
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}
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if err != nil {
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return nil, nil
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}
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return &redisStore{client}, nil
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}
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func (s *redisStore) put(key string, data []byte, expire time.Duration) error {
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ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
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defer cancel()
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exists := 0
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err := s.client.Do(ctx, radix.Cmd(&exists, "EXISTS", key))
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if err != nil {
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return err
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}
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if exists != 0 {
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return fmt.Errorf("%w: %s", errKeyCollision, key)
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}
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expireS := int64(expire / time.Second)
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err = s.client.Do(ctx, radix.FlatCmd(nil, "SETEX", key, expireS, data))
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if err != nil {
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return err
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}
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return nil
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}
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func (s *redisStore) get(key string) ([]byte, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
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defer cancel()
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var data []byte
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err := s.client.Do(ctx, radix.Cmd(&data, "GET", key))
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if err != nil {
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return nil, err
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}
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if len(data) == 0 {
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return nil, fmt.Errorf("%w: %s", errKeyNotFound, key)
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}
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return data, nil
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}
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