73 lines
2.7 KiB
Go
73 lines
2.7 KiB
Go
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package redis
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import (
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"context"
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"fmt"
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"strconv"
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"time"
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"github.com/redis/go-redis/v9"
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)
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// AddPending records a freshly-consumed offset as not-yet-acked, per design.md
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// §3/§4's `kmsvc:pending:` ZSET.
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func AddPending(ctx context.Context, rdb *redis.Client, queue, shardID string, partition int32, offset int64) error {
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key := PendingKey(queue, shardID, partition)
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if err := rdb.ZAdd(ctx, key, redis.Z{Score: float64(offset), Member: offset}).Err(); err != nil {
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return fmt.Errorf("add pending %s: %w", key, err)
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}
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return nil
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}
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// MinPending returns the lowest not-yet-acked offset for a (shard, partition),
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// or ok=false if nothing is pending — i.e. the watermark can advance to the
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// last consumed offset.
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func MinPending(ctx context.Context, rdb *redis.Client, queue, shardID string, partition int32) (offset int64, ok bool, err error) {
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res, err := rdb.ZRangeWithScores(ctx, PendingKey(queue, shardID, partition), 0, 0).Result()
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if err != nil {
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return 0, false, fmt.Errorf("min pending %s: %w", PendingKey(queue, shardID, partition), err)
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}
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if len(res) == 0 {
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return 0, false, nil
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}
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return int64(res[0].Score), true, nil
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}
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// SetWatermark stores the committable watermark for a (shard, partition),
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// per design.md §3's background committer.
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func SetWatermark(ctx context.Context, rdb *redis.Client, queue, shardID string, partition int32, offset int64) error {
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key := WatermarkKey(queue, shardID, partition)
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if err := rdb.Set(ctx, key, offset, 0).Err(); err != nil {
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return fmt.Errorf("set watermark %s: %w", key, err)
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}
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return nil
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}
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// GetWatermark returns the last-committed watermark for a (shard, partition),
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// or ok=false if none has been committed yet.
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func GetWatermark(ctx context.Context, rdb *redis.Client, queue, shardID string, partition int32) (offset int64, ok bool, err error) {
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v, err := rdb.Get(ctx, WatermarkKey(queue, shardID, partition)).Result()
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if err == redis.Nil {
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return 0, false, nil
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}
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if err != nil {
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return 0, false, fmt.Errorf("get watermark %s: %w", WatermarkKey(queue, shardID, partition), err)
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}
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n, err := strconv.ParseInt(v, 10, 64)
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if err != nil {
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return 0, false, fmt.Errorf("parse watermark %s: %w", WatermarkKey(queue, shardID, partition), err)
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}
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return n, true, nil
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}
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// AcquireFIFOLock claims the per-group exclusivity gate (design.md §3/§4's
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// `kmsvc:fifo_lock:` row) so only one in-flight message per MessageGroupId
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// is ever handed out.
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func AcquireFIFOLock(ctx context.Context, rdb *redis.Client, queue, groupID, receiptHandle string, ttl time.Duration) (bool, error) {
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ok, err := rdb.SetNX(ctx, FIFOLockKey(queue, groupID), receiptHandle, ttl).Result()
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if err != nil {
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return false, fmt.Errorf("acquire fifo lock %s: %w", groupID, err)
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}
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return ok, nil
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}
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