add support for retrieving current brightness value prior to performing action

wemo.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"encoding/json"
+	"encoding/xml"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -17,6 +18,7 @@ import (
 	"git.lerch.org/lobo/wemo/wemodiscovery"
 )
 
+
 type basementPost struct {
 	MovieMode bool
 }
@@ -31,6 +33,7 @@ type controlData struct {
 
 type deviceAction struct {
 	Device, Action, Content string
+	StartAction, StartContent, StartField string
 	Steps, Seconds, Start, End int
 	EndOff bool
 }
@@ -39,10 +42,28 @@ type soapActions struct {
 	On, Off []deviceAction
 }
 
+type soapResponse struct {
+	XMLName xml.Name `xml:"Envelope"`
+    Body getBinaryStateBody `xml:"http://schemas.xmlsoap.org/soap/envelope/ Body"`
+}
+type getBinaryStateBody struct {
+	XMLName xml.Name
+    GetBinaryStateResponse getBinaryStateBodyResponse `xml:"urn:Belkin:service:basicevent:1 GetBinaryStateResponse"`
+}
+type getBinaryStateBodyResponse struct {
+	XMLName xml.Name
+    State bool `xml:"BinaryState"`
+    Brightness int `xml:"brightness"`
+    Fader string `xml:"fader"`
+}
+
+
 var command string
 var client http.Client
 
 func main() {
+	getState := "\"urn:Belkin:service:basicevent:1#GetBinaryState\""
+	getStateContent := "<?xml version=\"1.0\" encoding=\"utf-8\"?><s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\"><s:Body><u:GetBinaryState xmlns:u=\"urn:Belkin:service:basicevent:1\"></u:GetBinaryState></s:Body></s:Envelope>"
 	command = os.Getenv("CMD")
 	port := os.Getenv("PORT")
 	if port == "" { port = ":8081" } else { port = ":" + port }
@@ -50,10 +71,25 @@ func main() {
 	if len(os.Args) > 1 {
 		if os.Args[1] == "on" {
 			movieMode(true)
-		}else{
+			time.Sleep(10 * time.Second) // Allow the thread time to do magic
+		}else if os.Args[1] == "off" {
 			movieMode(false)
+			time.Sleep(10 * time.Second) // Allow the thread time to do magic
+		}else if os.Args[1] == "scan" {
+			refreshControl()
+			println("control file updated")
+		}else if os.Args[1] == "getState" {
+			logger.Infof("getState")
+			addresses := readAddresses()
+			for _, address := range addresses.Devices {
+				if address.Name == os.Args[2] {
+					dim := getCurrentDimValue(address.Url+addresses.BasicEvent, address.Name, getState, getStateContent)
+					println("dim value is ", dim)
+				}
+			}
+		}else{
+			println("wemo [on|off|scan|getState] [device name]")
 		}
-		time.Sleep(10 * time.Second)
 		// movieMode(false)
 		os.Exit(0)
 	}
@@ -131,13 +167,17 @@ func commandDevice(url string, device deviceAction) {
 		sendCommand(url, device, device.Content)
 		return
 	}
-	logger.Tracef("%s: Stepping the change. %d to %d over %d steps", device.Device, device.Start, device.End, device.Steps)
+	start := device.Start
+	if start == -1 {
+		start = getCurrentDimValue(url, device.Device, device.StartAction, device.StartContent)
+	}
+	logger.Tracef("%s: Stepping the change. %d to %d over %d steps", device.Device, start, device.End, device.Steps)
 	// We want to fade something...
 	millisecondsPerTick := device.Seconds * 1000 / device.Steps
 	logger.Tracef("%s: %d ms per step over %d seconds", device.Device, millisecondsPerTick, device.Seconds)
-	deltaPerTick := (device.End  - device.Start) / (device.Steps - 1)
+	deltaPerTick := (device.End  - start) / (device.Steps - 1)
 	logger.Tracef("%s: %d change per command", device.Device, deltaPerTick)
-	currentValue := device.Start
+	currentValue := start
 	currentSteps := 0
 	ticker := time.NewTicker(time.Duration(millisecondsPerTick) * time.Millisecond)
 	quit := make(chan struct{})
@@ -192,6 +232,35 @@ func sendCommand(url string, device deviceAction, content string) {
 	}
 }
 
+func getCurrentDimValue(url string, name string, action string, content string) int {
+	req, err := http.NewRequest("POST", url, nil)
+	rc := 0
+	if err != nil {
+		logger.Errorf("Error building http request to device %s: %s", name, err)
+	}
+	req.Header.Add("SOAPACTION", action)
+	req.Header.Add("Content-type", `text/xml; charset="utf-8"`)
+	req.Body = ioutil.NopCloser(bytes.NewBufferString(content))
+	res, err := client.Do(req)
+	if err != nil {
+		logger.Errorf("Error on http request to device %s: %s", name, err)
+	}else{
+		responseBytes, err := ioutil.ReadAll(res.Body)
+		logger.Tracef("%s: Response from lights: %s", name, responseBytes)
+		if err != nil {
+			logger.Errorf("Error reading response from device %s: %s", name, err)
+		}
+		var envelope soapResponse
+		xml.Unmarshal(responseBytes, &envelope)
+		rc = envelope.Body.GetBinaryStateResponse.Brightness
+		logger.Tracef("%s: Unmarshal: #v", name, envelope)
+		logger.Tracef("%s: Brightness: %d", name, rc)
+		logger.Tracef("%s: State: %t", name, envelope.Body.GetBinaryStateResponse.State)
+		logger.Tracef("%s: Fader: %s", name, envelope.Body.GetBinaryStateResponse.Fader)
+	}
+	return rc
+}
+
 func readAddresses() controlData {
 	var rc controlData
 	bytes, err := ioutil.ReadFile("controlData.json")