58 lines
1.4 KiB
Go
58 lines
1.4 KiB
Go
package routes
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import (
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"encoding/json"
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"io"
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"net/http"
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"github.com/tigorlazuardi/redmage/pkg/log"
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)
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func (routes *Routes) EventsAPI(rw http.ResponseWriter, r *http.Request) {
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ctx, span := tracer.Start(r.Context(), "*Routes.EventsAPI")
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defer span.End()
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flush, ok := rw.(http.Flusher)
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if !ok {
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rw.WriteHeader(http.StatusInternalServerError)
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_ = json.NewEncoder(rw).Encode(map[string]string{"error": "server does not support streaming"})
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return
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}
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log.New(ctx).Info("new event stream connection", "user_agent", r.UserAgent())
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rw.Header().Set("Content-Type", "text/event-stream")
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rw.Header().Set("Cache-Control", "no-cache")
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rw.Header().Set("Connection", "keep-alive")
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rw.WriteHeader(200)
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flush.Flush()
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downloadEvent, closeDownloadEvent := routes.API.SubscribeImageDownloadEvent()
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defer closeDownloadEvent()
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enc := json.NewEncoder(rw)
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for {
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select {
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case <-r.Context().Done():
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log.New(ctx).Info("event stream connection closed", "user_agent", r.UserAgent())
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return
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case event := <-downloadEvent:
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if _, err := io.WriteString(rw, "event: image_download\n"); err != nil {
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return
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}
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if _, err := io.WriteString(rw, "data: "); err != nil {
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return
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}
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if err := enc.Encode(event); err != nil {
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return
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}
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// Single '\n' because enc.Encode already append '\n'
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if _, err := io.WriteString(rw, "\n"); err != nil {
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return
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}
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}
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flush.Flush()
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}
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}
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