Ryan
fb30e8e884
Move lesson source into the teaching structure, align the course path with the learner's Go and DevOps experience, and add the interactive lesson guides. Add advanced DevOps lifecycle study as a separate section. Bound MQTT message work and drain accepted jobs during shutdown; align the backend implementation with the revised course through Section 6.
39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
package dispatch
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import (
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"context"
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"fmt"
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"example.com/mqtt5-learning/internal/contracts"
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"example.com/mqtt5-learning/internal/mqtt"
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)
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type Processor func(context.Context, mqtt.Message) error
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// Receiver validates the route, selects a pool, and copies payload ownership.
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type Receiver struct {
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Telemetry *Pool
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Important *Pool
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Process Processor
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}
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func (r *Receiver) Submit(ctx context.Context, message mqtt.Message) (Outcome, error) {
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if r.Process == nil {
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return Stopping, fmt.Errorf("message processor is required")
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}
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topic, err := contracts.ParseTopic(message.Topic)
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if err != nil {
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return Stopping, err
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}
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pool := r.Telemetry
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if topic.Kind == contracts.KindCommands || topic.Kind == contracts.KindResponses || topic.Kind == contracts.KindSales {
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pool = r.Important
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}
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if pool == nil {
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return Stopping, fmt.Errorf("no queue configured for topic kind %q", topic.Kind)
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}
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copyOfMessage := message
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copyOfMessage.Payload = append([]byte(nil), message.Payload...)
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return pool.Submit(ctx, func(jobCtx context.Context) error { return r.Process(jobCtx, copyOfMessage) })
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}
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