feat(users): implemented basic user creation promise

pkg/users.go

@@ -0,0 +1,95 @@
+package gonf
+
+import (
+	"log/slog"
+)
+
+// ----- Globals ---------------------------------------------------------------
+var users []*UserPromise
+
+// users management functions
+var user_add_function func(data UserData) (Status, error)
+
+// ----- Init ------------------------------------------------------------------
+func init() {
+	users = make([]*UserPromise, 0)
+}
+
+// ----- Public ----------------------------------------------------------------
+func SetUsersConfiguration(useradd func(data UserData) (Status, error)) {
+	user_add_function = useradd
+}
+
+func User(data UserData) *UserPromise {
+	if data.Name == "" {
+		panic("User() promise invoked without specifying a username")
+	}
+	return &UserPromise{
+		chain:  nil,
+		data:   data,
+		states: nil,
+		status: PROMISED,
+	}
+}
+
+type UserData struct {
+	HomeDir string
+	Name    string
+	System  bool
+}
+
+type UserPromise struct {
+	chain  []Promise
+	data   UserData
+	states []string
+	status Status
+}
+
+func (u *UserPromise) IfRepaired(p ...Promise) Promise {
+	u.chain = append(u.chain, p...)
+	return u
+}
+
+func (u *UserPromise) Promise() Promise {
+	users = append(users, u)
+	return u
+}
+
+func (u *UserPromise) Resolve() {
+	var err error
+	u.status, err = user_add_function(u.data)
+	switch u.status {
+	case BROKEN:
+		slog.Error("user", "name", u.data.Name, "status", u.status, "error", err)
+	case KEPT:
+		slog.Debug("user", "name", u.data.Name, "status", u.status)
+	case REPAIRED:
+		slog.Info("user", "name", u.data.Name, "status", u.status)
+		if u.status == REPAIRED {
+			for _, pp := range u.chain {
+				pp.Resolve()
+			}
+		}
+	}
+}
+
+func (u UserPromise) Status() Status {
+	return u.status
+}
+
+// ----- Internal --------------------------------------------------------------
+func resolveUsers() (status Status) {
+	status = KEPT
+	for _, c := range users {
+		if c.status == PROMISED {
+			c.Resolve()
+			switch c.status {
+			case BROKEN:
+				return BROKEN
+			case REPAIRED:
+				status = REPAIRED
+			}
+		}
+	}
+	return
+}