add restart service endpoint

Author: Eslam-Nawara

docs/manual/api.md

@@ -153,14 +153,22 @@ it means it can act like an access node to user private networks
 
 The next set of commands are ONLY possible to be called by the `farmer` only.
 
-### Reboot
+### Reboot Node
 
 | command |body| return|
 |---|---|---|
 | `zos.admin.reboot` | - | - |
 
 Stops all services then reboot the node
 
+### Restart Service
+
+| command |body| return|
+|---|---|---|
+| `zos.admin.reboot` | string | - |
+
+Restarts a service running on the node
+
 ### List Physical Interfaces
 
 | command |body| return|

pkg/zos_api/admin.go

@@ -8,6 +8,21 @@ import (
 	"github.com/threefoldtech/zos/pkg/zinit"
 )
 
+func (g *ZosAPI) adminRestartHandler(ctx context.Context, payload []byte) (interface{}, error) {
+	var service string
+	if err := json.Unmarshal(payload, &service); err != nil {
+		return nil, fmt.Errorf("failed to decode input, expecting string: %w", err)
+	}
+
+	zinit := zinit.Default()
+
+	if err := zinit.Stop(service); err != nil {
+		return nil, err
+	}
+
+	return nil, zinit.Start(service)
+}
+
 func (g *ZosAPI) adminRebootHandler(ctx context.Context, payload []byte) (interface{}, error) {
 	zinit := zinit.Default()
 

pkg/zos_api/routes.go

@@ -46,6 +46,7 @@ func (g *ZosAPI) SetupRoutes(router *peer.Router) {
 	admin := root.SubRoute("admin")
 	admin.Use(g.authorized)
 	admin.WithHandler("reboot", g.adminRebootHandler)
+	admin.WithHandler("restart", g.adminRestartHandler)
 	admin.WithHandler("interfaces", g.adminInterfacesHandler)
 	admin.WithHandler("set_public_nic", g.adminSetPublicNICHandler)
 	admin.WithHandler("get_public_nic", g.adminGetPublicNICHandler)