From c252c9a9341a06755790eb067e9597d706914cef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Aur=C3=A9lie=20DELHAIE?= <aureliedelhaie3@gmail.com>
Date: Sun, 2 Nov 2025 14:35:20 +0100
Subject: [PATCH] add daemon config

---
 cmd/cli/config/config.go         | 10 ++++-
 cmd/server/api/api.go            |  4 +-
 cmd/server/core/config/config.go | 71 ++++++++++++++++++++++++++++++++
 cmd/server/main.go               | 25 +++++++++--
 4 files changed, 103 insertions(+), 7 deletions(-)
 create mode 100644 cmd/server/core/config/config.go

diff --git a/cmd/cli/config/config.go b/cmd/cli/config/config.go
index 3d60e9f..90f6d42 100644
--- a/cmd/cli/config/config.go
+++ b/cmd/cli/config/config.go
@@ -40,7 +40,7 @@ func Load() ClientConfiguration {
 		panic("failed to read the configuration file: " + err.Error())
 	}
 
-	return c
+	return fillDefault(c)
 }
 
 func Default() ClientConfiguration {
@@ -50,3 +50,11 @@ func Default() ClientConfiguration {
 		},
 	}
 }
+
+func fillDefault(c ClientConfiguration) ClientConfiguration {
+	if len(c.Deamon.URL) == 0 {
+		c.Deamon.URL = Default().Deamon.URL
+	}
+
+	return c
+}
diff --git a/cmd/server/api/api.go b/cmd/server/api/api.go
index 81e7f5f..d0fc31e 100644
--- a/cmd/server/api/api.go
+++ b/cmd/server/api/api.go
@@ -25,7 +25,7 @@ type (
 	}
 )
 
-func NewServer(data *storage.Repository, scheduler *cronruntime.Scheduler, port int) *HTTPServer {
+func NewServer(data *storage.Repository, scheduler *cronruntime.Scheduler, addr string, port int) *HTTPServer {
 	s := &HTTPServer{
 		data:      data,
 		scheduler: scheduler,
@@ -57,7 +57,7 @@ func NewServer(data *storage.Repository, scheduler *cronruntime.Scheduler, port
 		})
 	})
 	s.Server = &http.Server{
-		Addr:    fmt.Sprintf(":%d", port),
+		Addr:    fmt.Sprintf("%s:%d", addr, port),
 		Handler: router,
 	}
 	return s
diff --git a/cmd/server/core/config/config.go b/cmd/server/core/config/config.go
new file mode 100644
index 0000000..aad81c3
--- /dev/null
+++ b/cmd/server/core/config/config.go
@@ -0,0 +1,71 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type (
+	DaemonConfiguration struct {
+		Server   ServerConfiguration   `json:"server"`
+		Database DatabaseConfiguration `json:"database"`
+	}
+
+	ServerConfiguration struct {
+		Address string `json:"addr"`
+		Port    uint16 `json:"port"`
+	}
+
+	DatabaseConfiguration struct {
+		Path string `json:"path"`
+	}
+)
+
+func Load(path string) (DaemonConfiguration, error) {
+	path = filepath.Join(path, "config.json")
+
+	f, err := os.OpenFile(path, os.O_RDONLY, 0)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return Default(), nil
+		}
+		return DaemonConfiguration{}, fmt.Errorf("failed to load configuration file (%s): %s", path, err)
+	}
+	defer f.Close()
+
+	var c DaemonConfiguration
+	d := json.NewDecoder(f)
+	if err := d.Decode(&c); err != nil {
+		return DaemonConfiguration{}, fmt.Errorf("failed to read configuration file (%s): %s", path, err)
+	}
+
+	return fillDefault(c), nil
+}
+
+func Default() DaemonConfiguration {
+	return DaemonConfiguration{
+		Server: ServerConfiguration{
+			Address: "127.0.0.1",
+			Port:    25697,
+		},
+		Database: DatabaseConfiguration{
+			Path: "/var/lib/mirror-sync/data.db",
+		},
+	}
+}
+
+func fillDefault(c DaemonConfiguration) DaemonConfiguration {
+	if len(c.Database.Path) == 0 {
+		c.Database.Path = Default().Database.Path
+	}
+	if len(c.Server.Address) == 0 {
+		c.Server.Address = Default().Server.Address
+	}
+	if c.Server.Port == 0 {
+		c.Server.Port = Default().Server.Port
+	}
+	return c
+}
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 47114d7..6a628ce 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -1,9 +1,11 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"log/slog"
 	"mirror-sync/cmd/server/api"
+	"mirror-sync/cmd/server/core/config"
 	cronruntime "mirror-sync/cmd/server/core/runtime"
 	"mirror-sync/cmd/server/core/storage"
 	"mirror-sync/pkg/constants"
@@ -13,14 +15,29 @@ import (
 )
 
 func main() {
+	ecpath := os.Getenv("MIRRORSYNC_CONFIG_PATH")
+	if len(ecpath) == 0 {
+		ecpath = "/etc/mirror-sync"
+	}
+
+	var configPath string
+	flag.StringVar(&configPath, "config", ecpath, "path to the configuration folder")
+	flag.Parse()
+
+	c, err := config.Load(configPath)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, "failed to start server:", err.Error())
+		os.Exit(1)
+	}
+
 	dbPath := os.Getenv("MIRRORSYNC_DB_PATH")
 	if len(dbPath) == 0 {
-		dbPath = "/var/lib/mirror-sync/data.db"
+		dbPath = c.Database.Path
 	}
 
 	p := os.Getenv("MIRRORSYNC_PORT")
 	if len(p) == 0 {
-		p = "25697"
+		p = fmt.Sprintf("%d", c.Server.Port)
 	}
 
 	port, err := strconv.Atoi(p)
@@ -59,9 +76,9 @@ func main() {
 	slog.Info("daemon scheduler is running")
 
 	// api
-	s := api.NewServer(data, scheduler, port)
+	s := api.NewServer(data, scheduler, c.Server.Address, port)
 
-	slog.Info("daemon listening to :" + p)
+	slog.Info(fmt.Sprintf("daemon listening to %s:%s", c.Server.Address, p))
 	if err := s.Server.ListenAndServe(); err != nil {
 		fmt.Fprintln(os.Stderr, "failed to start server:", err.Error())
 		os.Exit(1)