56 lines
1.8 KiB
Go
56 lines
1.8 KiB
Go
package redis
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import (
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"context"
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"encoding/json"
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"fmt"
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"github.com/redis/go-redis/v9"
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"forgejo.riotpiao.com/rock/kmsvc-manage/internal/kafka"
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)
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// PutShardMap writes the active shard set for a queue (design.md §4's
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// `kmsvc:shardmap:` row) and publishes an invalidation so cached readers
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// refresh. Written by the queue-operator on every reconcile that changes
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// shard membership (initial create, split, close).
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func PutShardMap(ctx context.Context, rdb *redis.Client, queue string, shards []kafka.Shard) error {
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data, err := json.Marshal(shards)
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if err != nil {
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return fmt.Errorf("marshal shard map %s: %w", queue, err)
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}
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pipe := rdb.TxPipeline()
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pipe.Set(ctx, ShardMapKey(queue), data, 0)
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pipe.Publish(ctx, ShardMapChannel(queue), "invalidate")
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if _, err := pipe.Exec(ctx); err != nil {
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return fmt.Errorf("put shard map %s: %w", queue, err)
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}
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return nil
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}
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// GetShardMap reads the active shard set for a queue, or ok=false if the
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// queue has no shard map yet (not yet reconciled).
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func GetShardMap(ctx context.Context, rdb *redis.Client, queue string) ([]kafka.Shard, bool, error) {
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data, err := rdb.Get(ctx, ShardMapKey(queue)).Bytes()
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if err == redis.Nil {
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return nil, false, nil
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}
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if err != nil {
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return nil, false, fmt.Errorf("get shard map %s: %w", queue, err)
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}
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var shards []kafka.Shard
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if err := json.Unmarshal(data, &shards); err != nil {
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return nil, false, fmt.Errorf("unmarshal shard map %s: %w", queue, err)
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}
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return shards, true, nil
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}
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// DeleteShardMap removes a queue's shard map, used by the queue-operator on
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// Queue deletion.
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func DeleteShardMap(ctx context.Context, rdb *redis.Client, queue string) error {
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if err := rdb.Del(ctx, ShardMapKey(queue)).Err(); err != nil {
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return fmt.Errorf("delete shard map %s: %w", queue, err)
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}
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return nil
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}
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