Add dummy mode to stm executable

It uses Dummy implementation of InterfaceCloser originally created by
amistewicz.

New boolean flag "-dummy" is provided.

It should be used when only logging of the commands used is desired.

Change-Id: If5dc582aef3e691282ed616c992c0e96d31dc087
Signed-off-by: Michal Sidor <m.sidor@samsung.com>

Author: Michal Sidor

sw/nanopi/cmd/stm/stm.go

@@ -29,13 +29,15 @@ var (
 	serviceSocket     string
 	serve             bool
 	remote            string
+	dummy             bool
 )
 
 func setGlobalFlags() {
 	flag.StringVar(&userServiceSocket, "user-listen", "/run/stm-user.socket", "path to socket on which user RPC interface will be served")
 	flag.StringVar(&serviceSocket, "listen", "/run/stm.socket", "path to socket on which user and admin RPC interface will be served")
 	flag.BoolVar(&serve, "serve", false, "start RPC service")
 	flag.StringVar(&remote, "remote", "", "path to socket to use as a RPC service instead of local connection")
+	flag.BoolVar(&dummy, "dummy", false, "log actions instead of performing them")
 }
 
 func checkErr(ctx string, err error) {
@@ -63,8 +65,14 @@ func main() {
 		log.Fatal("conflicting flags: serve and remote")
 	}
 
+	if (remote != "") && dummy {
+		log.Fatal("conflicting flags: dummy and remote")
+	}
+
 	var dev stm.InterfaceCloser
-	if remote != "" {
+	if dummy {
+		dev = stm.NewDummy("stm")
+	} else if remote != "" {
 		cl, err := rpc.Dial("unix", remote)
 		checkErr("failed to connect to RPC service: ", err)
 

sw/nanopi/stm/dummy.go

@@ -0,0 +1,112 @@
+/*
+ *  Copyright (c) 2018 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License
+ */
+
+package stm
+
+import (
+	"log"
+	"time"
+)
+
+// Dummy is a dummy implementation of Interface.
+// It logs to the standard logger from "log" package.
+type Dummy struct {
+	ctx string
+}
+
+// NewDummy return a dummy implementation of Interface.
+// Each message will be prefixed with context.
+func NewDummy(context string) InterfaceCloser {
+	return &Dummy{ctx: context}
+}
+
+// Close prints "Close" to the standard logger.
+func (d *Dummy) Close() error {
+	log.Println(d.ctx, "Close")
+	return nil
+}
+
+// PowerTick prints "PowerTick" and duration argument to the standard logger.
+func (d *Dummy) PowerTick(duration time.Duration) error {
+	log.Println(d.ctx, "PowerTick", duration)
+	return nil
+}
+
+// SetLED prints "SetLED" and arguments to the standard logger.
+func (d *Dummy) SetLED(led LED, r, g, b uint8) error {
+	log.Println(d.ctx, "SetLED", led, r, g, b)
+	return nil
+}
+
+// ClearDisplay prints "ClearDisplay" to the standard logger.
+func (d *Dummy) ClearDisplay() error {
+	log.Println(d.ctx, "ClearDisplay")
+	return nil
+}
+
+// PrintText prints "PrintText" and arguments to the standard logger.
+func (d *Dummy) PrintText(x, y uint, color Color, text string) error {
+	log.Println(d.ctx, "PrintText", x, y, color, text)
+	return nil
+}
+
+// DUT prints "DUT" to the standard logger.
+func (d *Dummy) DUT() error {
+	log.Println(d.ctx, "DUT")
+	return nil
+}
+
+// TS prints "TS" to the standard logger.
+func (d *Dummy) TS() error {
+	log.Println(d.ctx, "TS")
+	return nil
+}
+
+// GetCurrent prints "GetCurrent" to the standard logger and returns 0.
+func (d *Dummy) GetCurrent() (int, error) {
+	log.Println(d.ctx, "GetCurrent")
+	return 0, nil
+}
+
+// StartCurrentRecord prints "StartCurrentRecord" and arguments to the standard logger.
+func (d *Dummy) StartCurrentRecord(samples int, interval time.Duration) error {
+	log.Println(d.ctx, "StartCurrentRecord", samples, interval)
+	return nil
+}
+
+// StopCurrentRecord prints "StopCurrentRecord" to the standard logger.
+func (d *Dummy) StopCurrentRecord() error {
+	log.Println(d.ctx, "StopCurrentRecord")
+	return nil
+}
+
+// GetCurrentRecord prints "GetCurrentRecord" to the standard logger and returns nil.
+func (d *Dummy) GetCurrentRecord() ([]int, error) {
+	log.Println(d.ctx, "GetCurrentRecord")
+	return nil, nil
+}
+
+// HDMI prints "HDMI" and argument to the standard logger.
+func (d *Dummy) HDMI(on bool) (err error) {
+	log.Println(d.ctx, "HDMI", on)
+	return nil
+}
+
+// SetDyper prints "SetDyper" and arguments to the standard logger.
+func (d *Dummy) SetDyper(dyper Dyper, on bool) error {
+	log.Println(d.ctx, "SetDyper", dyper, on)
+	return nil
+}