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https://github.com/warmbly/warmbly.git
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Matthew Meszaros
a552e69070
Transport-agnostic EventBus (Publish / Subscribe / Close / Name) with
two implementations:
KafkaBus - wraps the existing internal/infrastructure/kafka producer
and consumer. Existing call sites that use the kafka
package directly keep working.
NATSBus - JetStream-backed. File storage, 7d max age, durable
consumers per group, manual ack with redelivery on
handler error.
Factory FromEnv selects via EVENTBUS_PROVIDER (default kafka). NATS
needs NATS_URL; Kafka reuses the existing bootstrap+SASL config.
Subject naming converts Kafka colons to NATS dots so the existing
w:<uuid> topic naming works on both backends.
16 tests including round-trip ack-redelivery against an embedded
nats-server.
50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
package eventbus
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import (
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"fmt"
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"os"
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"github.com/warmbly/warmbly/internal/infrastructure/kafka"
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)
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// FromEnv constructs the active EventBus from environment variables.
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//
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// EVENTBUS_PROVIDER=kafka -> NewKafka (defaults: existing kafka package)
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// EVENTBUS_PROVIDER=nats -> NewNATS (JetStream)
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// (unset) -> defaults to "kafka" for backwards compatibility
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//
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// Kafka selection inputs:
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//
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// bootstrap, sasl — passed in by the caller (already loaded from secrets).
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//
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// NATS selection inputs (all env):
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//
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// NATS_URL -> nats://host:port (default: nats://localhost:4222)
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// NATS_STREAM_NAME -> JetStream stream name (default: "warmbly")
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// NATS_SUBJECT_PREFIX -> subject prefix under the stream (default: "warmbly")
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//
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// The Kafka inputs are passed positionally rather than via env to match the
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// existing wiring: bootstrap / SASL config already flow from cfg.Load* helpers
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// in cmd/*. Self-hosters who pick NATS will leave those unset.
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func FromEnv(bootstrap string, sasl *kafka.SASLConfig) (EventBus, error) {
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provider := os.Getenv("EVENTBUS_PROVIDER")
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if provider == "" {
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provider = "kafka"
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}
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switch provider {
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case "kafka":
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return NewKafka(KafkaConfig{
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Bootstrap: bootstrap,
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SASL: sasl,
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})
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case "nats":
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return NewNATS(NATSConfig{
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URL: natsURLFromEnv(),
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StreamName: os.Getenv("NATS_STREAM_NAME"),
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SubjectPrefix: os.Getenv("NATS_SUBJECT_PREFIX"),
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})
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default:
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return nil, fmt.Errorf("eventbus: unknown EVENTBUS_PROVIDER %q (want: kafka, nats)", provider)
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}
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}
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