74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
// package sselog is work in progress to implement a writer that sends its logs
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// to a http server side event.
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// nolint:gochecknoglobals,godox
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package sselog
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import (
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"fmt"
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"net/http"
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"go.xsfx.dev/logginghandler"
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)
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// Log is the global sse logger struct.
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var Log *SSELog
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type SSELog struct {
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Receivers map[chan []byte]struct{}
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}
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func NewSSELog() *SSELog {
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return &SSELog{
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Receivers: make(map[chan []byte]struct{}),
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}
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}
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func (l SSELog) Write(p []byte) (n int, err error) {
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// Send log message to all receiver channels.
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for r := range l.Receivers {
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r <- p
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}
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return len(p), nil
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}
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func LogHandler(w http.ResponseWriter, r *http.Request) {
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logger := logginghandler.Logger(r)
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logger.Info().Msg("registering a new sse logger")
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flusher, ok := w.(http.Flusher)
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if !ok {
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logger.Error().Msg("streaming unsupported")
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http.Error(w, "streaming unsupported", http.StatusInternalServerError)
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return
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}
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w.Header().Set("Content-Type", "text/event-stream")
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w.Header().Set("Cache-Control", "no-cache")
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w.Header().Set("Connection", "keep-alive")
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// TODO: has to be something else!
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w.Header().Set("Access-Control-Allow-Origin", "*")
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cChan := make(chan []byte)
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Log.Receivers[cChan] = struct{}{}
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for {
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select {
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case e := <-cChan:
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// Send event to client.
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fmt.Fprintf(w, "data: %s\n\n", e)
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// Send it right now and not buffering it.
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flusher.Flush()
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case <-r.Context().Done():
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close(cChan)
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delete(Log.Receivers, cChan)
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return
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}
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}
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}
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