Ilia Denisov
74 lines
1.9 KiB
Go
74 lines
1.9 KiB
Go
package notificationintent
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import (
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"context"
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"errors"
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"fmt"
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"github.com/redis/go-redis/v9"
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)
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// RedisClient stores the minimal Redis command surface required by Publisher.
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type RedisClient interface {
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// XAdd appends one entry to a Redis Stream.
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XAdd(context.Context, *redis.XAddArgs) *redis.StringCmd
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}
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// PublisherConfig stores the dependencies and stream name used by Publisher.
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type PublisherConfig struct {
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// Client appends normalized intents to Redis Streams.
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Client RedisClient
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// Stream stores the Redis Stream name. When empty, DefaultIntentsStream is
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// used.
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Stream string
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}
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// Publisher publishes normalized notification intents into the Notification
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// Service ingress stream.
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type Publisher struct {
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client RedisClient
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stream string
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}
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// NewPublisher constructs a Publisher from cfg.
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func NewPublisher(cfg PublisherConfig) (*Publisher, error) {
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if cfg.Client == nil {
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return nil, errors.New("new notification intent publisher: nil redis client")
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}
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if cfg.Stream == "" {
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cfg.Stream = DefaultIntentsStream
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}
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return &Publisher{
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client: cfg.Client,
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stream: cfg.Stream,
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}, nil
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}
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// Publish validates intent and appends it with plain XADD. It does not trim
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// the stream and does not perform hidden retries.
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func (publisher *Publisher) Publish(ctx context.Context, intent Intent) (string, error) {
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if ctx == nil {
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return "", errors.New("publish notification intent: nil context")
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}
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if publisher == nil || publisher.client == nil {
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return "", errors.New("publish notification intent: nil publisher")
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}
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values, err := intent.Values()
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if err != nil {
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return "", fmt.Errorf("publish notification intent: %w", err)
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}
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entryID, err := publisher.client.XAdd(ctx, &redis.XAddArgs{
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Stream: publisher.stream,
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Values: values,
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}).Result()
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if err != nil {
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return "", fmt.Errorf("publish notification intent: xadd: %w", err)
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}
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return entryID, nil
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}
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