Add Dryad interface

User, Admin and Worker communication to Boruta was designed, but an
interface in opposite direction, from Server to Worker, was missing.

Change-Id: I915c31e12b0b49d6863d1162734db7a324d709d1
Signed-off-by: Aleksander Mistewicz <a.mistewicz@samsung.com>
Reviewed-on: https://mcdsrvbld02.digital.local/review/49405
Reviewed-by: Maciej Wereski <m.wereski@partner.samsung.com>
Tested-by: Maciej Wereski <m.wereski@partner.samsung.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/boruta.go b/boruta.go
index 90d34e4..a4d08c8 100644
--- a/boruta.go
+++ b/boruta.go
@@ -22,6 +22,7 @@
 package boruta
 
 import (
+	"crypto/rsa"
 	"time"
 )
 
@@ -187,3 +188,17 @@ type Server interface {
 	Superviser
 	Workers
 }
+
+// Dryad is a MuxPi management interface used by Boruta.
+type Dryad interface {
+	// PutInMaintenance prepares MuxPi for administrative action.
+	// It blinks LEDs, prints msg on the OLED display, etc.
+	PutInMaintenance(msg string) error
+	// Prepare creates appropriate user, generates RSA key, installs public key
+	// so that it can be used for SSH authentication and returns private key.
+	// It removes current instance of the user, etc.
+	Prepare() (*rsa.PrivateKey, error)
+	// Healthcheck tests Dryad for system state, STM functions and state on MuxPi.
+	// It may cause Dryad to call SetFail of Worker interface if the problem detected is critical.
+	Healthcheck() error
+}