Split backend service into checker and generator

Both are linked through a unix socket.

checker/generation.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"srs.epita.fr/fic-server/libfic"
+)
+
+var generatorSocket string
+
+func appendGenQueue(gs fic.GenStruct) error {
+	buf, err := json.Marshal(gs)
+	if err != nil {
+		return fmt.Errorf("Something is wrong with JSON encoder: %w", err)
+	}
+
+	sockType := "unix"
+	if strings.Contains(generatorSocket, ":") {
+		sockType = "tcp"
+	}
+
+	socket, err := net.Dial(sockType, generatorSocket)
+	if err != nil {
+		log.Printf("Unable to contact generator at: %s, retring in 1 second", generatorSocket)
+		time.Sleep(time.Second)
+		return appendGenQueue(gs)
+	}
+	defer socket.Close()
+
+	httpClient := &http.Client{
+		Transport: &http.Transport{
+			Dial: func(network, addr string) (net.Conn, error) {
+				return socket, nil
+			},
+		},
+	}
+
+	resp, err := httpClient.Post("http://localhost/enqueue", "application/json", bytes.NewReader(buf))
+	if err != nil {
+		return fmt.Errorf("Unable to enqueue new generation event: %w", err)
+	}
+	resp.Body.Close()
+
+	return nil
+}