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package redistool
import (
"context"
"errors"
"fmt"
"time"
"github.com/redis/rueidis"
"google.golang.org/protobuf/proto"
)
type BuilderKV[K2 any] struct {
HashKey K2
// Value is the value to store in Redis.
Value *ExpiringValue
}
type SetBuilder[K1 any, K2 any] interface {
// Set enqueues a HSET command. Does nothing if no kvs provided.
Set(key K1, ttl time.Duration, kvs ...BuilderKV[K2])
// Do executes enqueued commands. Does nothing if no commands have been enqueued.
// Builder must not be reused after this method has been called.
Do(context.Context) error
}
type RedisSetBuilder[K1 any, K2 any] struct {
client rueidis.Client
key1ToRedisKey KeyToRedisKey[K1]
key2ToRedisKey KeyToRedisKey[K2]
cmds []rueidis.Completed
setErr error
}
func (b *RedisSetBuilder[K1, K2]) Set(key K1, ttl time.Duration, kvs ...BuilderKV[K2]) {
if len(kvs) == 0 || b.setErr != nil {
return
}
redisKey := b.key1ToRedisKey(key)
hsetCmd := b.client.B().Hset().Key(redisKey).FieldValue()
for _, kv := range kvs {
redisValue, err := proto.Marshal(kv.Value)
if err != nil {
// This should never happen. Rather than returning an error here and complicating the API, we store the error
// and return it when Do() is called.
b.setErr = fmt.Errorf("failed to marshal ExpiringValue: %w", err)
return
}
hsetCmd.FieldValue(b.key2ToRedisKey(kv.HashKey), rueidis.BinaryString(redisValue))
}
b.cmds = append(b.cmds,
hsetCmd.Build(),
b.client.B().Pexpire().Key(redisKey).Milliseconds(ttl.Milliseconds()).Build(),
)
}
func (b *RedisSetBuilder[K1, K2]) Do(ctx context.Context) error {
if b.setErr != nil { // must be checked before the b.cmd length.
return b.setErr
}
if len(b.cmds) == 0 {
return nil
}
multi := make([]rueidis.Completed, 0, len(b.cmds)+2)
multi = append(multi, b.client.B().Multi().Build())
multi = append(multi, b.cmds...)
multi = append(multi, b.client.B().Exec().Build())
resp := b.client.DoMulti(ctx, multi...)
return errors.Join(MultiErrors(resp)...)
}
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