jbrechtel
25881f3ff8
- Pub/sub broker with fan-out to SSE clients - POST /webhook — receives Gitea push events, optional HMAC verification - GET /events — SSE stream of push events - GET /health — health check endpoint - Zero external dependencies (stdlib only) - Docker-based build via goctl wrapper (golang:1.26-alpine) - systemd unit, README with deployment docs - Tests: broker pub/sub, slow subscriber drop, ref parsing, signature verification - 6.0M static binary
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"log/slog"
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"net/http"
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)
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func sseHandler(broker *Broker) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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flusher, ok := w.(http.Flusher)
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if !ok {
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http.Error(w, "streaming not supported", 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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w.Header().Set("X-Accel-Buffering", "no") // disable nginx buffering
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ch := broker.Subscribe()
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defer broker.Unsubscribe(ch)
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slog.Debug("SSE client connected")
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ctx := r.Context()
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for {
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select {
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case <-ctx.Done():
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slog.Debug("SSE client disconnected")
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return
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case evt, ok := <-ch:
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if !ok {
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// Broker shut down
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return
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}
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writeSSEEvent(w, flusher, "push", evt)
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}
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}
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}
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}
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func writeSSEEvent(w http.ResponseWriter, flusher http.Flusher, eventType string, data any) {
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jsonData, err := json.Marshal(data)
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if err != nil {
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slog.Warn("failed to marshal SSE event", "error", err)
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return
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}
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_, err = fmt.Fprintf(w, "event: %s\ndata: %s\n\n", eventType, jsonData)
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if err != nil {
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slog.Debug("failed to write SSE event, client likely disconnected", "error", err)
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return
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}
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flusher.Flush()
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}
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