From d3fb280a146759ca1468c1773f41599b4fabb5fa Mon Sep 17 00:00:00 2001
From: Julio Capote <jcapote@gmail.com>
Date: Sat, 17 Dec 2022 10:31:03 -0500
Subject: initial

---
 cgi/servers.go | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 cgi/servers.go

(limited to 'cgi')

diff --git a/cgi/servers.go b/cgi/servers.go
new file mode 100644
index 0000000..b18c6a3
--- /dev/null
+++ b/cgi/servers.go
@@ -0,0 +1,90 @@
+package cgi
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/http/cgi"
+	"os"
+	"sync"
+	"time"
+
+	"git.capotej.com/capotej/communique/config"
+)
+
+type Servers struct{}
+
+func NewServers() *Servers {
+	return &Servers{}
+}
+
+// Start iterates over all Handlers and starts an internal CGI server for each one
+// along with ticker for the configured handler interval and blocks forever
+func (s *Servers) Start(cfg config.Config) {
+	var wg sync.WaitGroup
+
+	for _, handler := range cfg.Handlers {
+		wg.Add(2)
+		go func(aHandler config.Handler) {
+			defer wg.Done()
+			startCGIServer(aHandler)
+		}(handler)
+		go func(aHandler config.Handler) {
+			defer wg.Done()
+			startTicker(aHandler)
+		}(handler)
+	}
+	wg.Wait()
+}
+
+func startCGIServer(h config.Handler) {
+	cgiHandler := cgi.Handler{Path: h.Exec}
+
+	server := http.Server{
+		Handler: &cgiHandler,
+	}
+
+	sock := fmt.Sprintf("%s.sock", h.Name)
+	os.Remove(sock)
+	unixListener, err := net.Listen("unix", sock)
+	if err != nil {
+		panic(err)
+	}
+	server.Serve(unixListener)
+}
+
+func startTicker(h config.Handler) {
+	// TODO add config for this
+	ticker := time.NewTicker(5 * time.Second)
+	done := make(chan bool)
+	func() {
+		for {
+			select {
+			case <-done:
+				return
+			case _ = <-ticker.C:
+				tick(h)
+			}
+		}
+	}()
+}
+
+func tick(h config.Handler) {
+	sock := fmt.Sprintf("%s.sock", h.Name)
+	httpc := http.Client{
+		Transport: &http.Transport{
+			DialContext: func(_ context.Context, _, _ string) (net.Conn, error) {
+				return net.Dial("unix", sock)
+			},
+		},
+	}
+	var response *http.Response
+	var err error
+	response, err = httpc.Get("http://unix/" + sock)
+	if err != nil {
+		panic(err)
+	}
+	io.Copy(os.Stdout, response.Body)
+}
-- 
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