44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
package infra
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import (
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"fmt"
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"net/http"
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"strings"
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)
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// SSESend escribe un evento SSE formateado al ResponseWriter y hace flush si es posible.
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// Sigue la spec W3C: campos opcionales (event, id, retry) solo se incluyen si tienen valor.
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// Data con saltos de linea se traduce a multiples lineas "data:" segun la spec.
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// Retorna error si la escritura falla.
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func SSESend(w http.ResponseWriter, event SSEEvent) error {
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var b strings.Builder
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if event.Event != "" {
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b.WriteString("event: ")
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b.WriteString(event.Event)
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b.WriteByte('\n')
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}
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if event.ID != "" {
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b.WriteString("id: ")
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b.WriteString(event.ID)
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b.WriteByte('\n')
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}
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if event.Retry > 0 {
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fmt.Fprintf(&b, "retry: %d\n", event.Retry)
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}
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// Data: cada salto de linea genera una nueva linea "data:"
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for _, line := range strings.Split(event.Data, "\n") {
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b.WriteString("data: ")
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b.WriteString(line)
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b.WriteByte('\n')
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}
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b.WriteByte('\n') // separador de eventos
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if _, err := w.Write([]byte(b.String())); err != nil {
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return fmt.Errorf("sse send: %w", err)
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}
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if flusher, ok := w.(http.Flusher); ok {
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flusher.Flush()
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}
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return nil
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}
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