Switch calls to use dbus library and add helpers for private connections

calls.go

@@ -1,85 +1,65 @@
 package main
 
 import (
-	"bufio"
+	"github.com/godbus/dbus/v5"
-	"encoding/json"
-	"fmt"
-	"os/exec"
-	"strconv"
-	"strings"
-
 	"github.com/rs/zerolog/log"
 	"go.arsenm.dev/infinitime"
 )
 
 func initCallNotifs(dev *infinitime.Device) error {
 	// Define rule to filter dbus messages
-	rule := "type='signal',sender='org.freedesktop.ModemManager1',interface='org.freedesktop.ModemManager1.Modem.Voice',member='CallAdded'"
+	//rule := "type='signal',sender='org.freedesktop.ModemManager1',interface='org.freedesktop.ModemManager1.Modem.Voice',member='CallAdded'"
 
-	// Use dbus-monitor command with profiling output as a workaround
+	// Connect to dbus session monitorConn
-	// because go-bluetooth seems to monopolize the system bus connection
+	monitorConn, err := newSystemBusConn()
-	// which makes monitoring show only bluez-related messages.
-	cmd := exec.Command("dbus-monitor", "--system", "--profile", rule)
-	// Get command output pipe
-	stdout, err := cmd.StdoutPipe()
-	if err != nil {
-		return err
-	}
-	// Run command asynchronously
-	err = cmd.Start()
 	if err != nil {
 		return err
 	}
 
-	// Create new scanner for command output
+	conn, err := newSystemBusConn()
-	scanner := bufio.NewScanner(stdout)
+	if err != nil {
+		return err
+	}
+
+	err = monitorConn.AddMatchSignal(
+		dbus.WithMatchSender("org.freedesktop.ModemManager1"),
+		dbus.WithMatchInterface("org.freedesktop.ModemManager1.Modem.Voice"),
+		dbus.WithMatchMember("CallAdded"),
+	)
+	if err != nil {
+		return err
+	}
+
+	c := make(chan *dbus.Message, 10)
+	monitorConn.Eavesdrop(c)
 	go func() {
-		// For each line in output
+		for x := range c {
-		for scanner.Scan() {
+			callPath := x.Body[0].(dbus.ObjectPath)
-			// Get line as string
+			callObj := conn.Object("org.freedesktop.ModemManager1", callPath)
-			text := scanner.Text()
 
-			// If line starts with "#", it is part of
+			phoneNum, err := getPhoneNum(conn, callObj)
-			// the field format, skip it.
+			if err != nil {
-			if strings.HasPrefix(text, "#") {
+				log.Fatal().Err(err).Send()
-				continue
 			}
 
-			// Split line into fields. The order is as follows:
-			// type timestamp serial sender destination path interface member
-			fields := strings.Fields(text)
-			// Field 7 is Member. Make sure it is "CallAdded".
-			if fields[7] == "CallAdded" {
-				// Get Modem ID from modem path
-				modemID := parseModemID(fields[5])
-				// Get call ID of current call
-				callID, err := getCurrentCallID(modemID)
-				if err != nil {
-					continue
-				}
-				// Get phone number of current call
-				phoneNum, err := getPhoneNum(callID)
-				if err != nil {
-					continue
-				}
-				// Send call notification to PineTime
 			resCh, err := dev.NotifyCall(phoneNum)
 			if err != nil {
 				continue
 			}
+
 			go func() {
 				// Wait for PineTime response
 				res := <-resCh
 				switch res {
 				case infinitime.CallStatusAccepted:
 					// Attempt to accept call
-						err = acceptCall(callID)
+					err = acceptCall(conn, callObj)
 					if err != nil {
 						log.Warn().Err(err).Msg("Error accepting call")
 					}
 				case infinitime.CallStatusDeclined:
 					// Attempt to decline call
-						err = declineCall(callID)
+					err = declineCall(conn, callObj)
 					if err != nil {
 						log.Warn().Err(err).Msg("Error declining call")
 					}
@@ -89,88 +69,31 @@ func initCallNotifs(dev *infinitime.Device) error {
 				}
 			}()
 		}
-		}
 	}()
 	return nil
 }
 
-func parseModemID(modemPath string) int {
+func getPhoneNum(conn *dbus.Conn, callObj dbus.BusObject) (string, error) {
-	// Split path by "/"
+	var out string
-	splitPath := strings.Split(modemPath, "/")
+	err := callObj.StoreProperty("org.freedesktop.ModemManager1.Call.Number", &out)
-	// Get last element and convert to integer
-	id, _ := strconv.Atoi(splitPath[len(splitPath)-1])
-	return id
-}
-
-func getCurrentCallID(modemID int) (int, error) {
-	// Create mmcli command
-	cmd := exec.Command("mmcli", "--voice-list-calls", "-m", fmt.Sprint(modemID), "-J")
-	// Run command and get output
-	data, err := cmd.Output()
-	if err != nil {
-		return 0, err
-	}
-	var calls map[string][]string
-	// Decode JSON from command output
-	err = json.Unmarshal(data, &calls)
-	if err != nil {
-		return 0, err
-	}
-	// Get first call in output
-	firstCall := calls["modem.voice.call"][0]
-	// Split path by "/"
-	splitCall := strings.Split(firstCall, "/")
-	// Return last element converted to integer
-	return strconv.Atoi(splitCall[len(splitCall)-1])
-}
-
-func getPhoneNum(callID int) (string, error) {
-	// Create dbus-send command
-	cmd := exec.Command("dbus-send",
-		"--dest=org.freedesktop.ModemManager1",
-		"--system",
-		"--print-reply=literal",
-		"--type=method_call",
-		fmt.Sprintf("/org/freedesktop/ModemManager1/Call/%d", callID),
-		"org.freedesktop.DBus.Properties.Get",
-		"string:org.freedesktop.ModemManager1.Call",
-		"string:Number",
-	)
-	// Run command and get output
-	numData, err := cmd.Output()
 	if err != nil {
 		return "", err
 	}
-	// Split output into fields
+	return out, nil
-	num := strings.Fields(string(numData))
-	// Return last field
-	return num[len(num)-1], nil
 }
 
-func acceptCall(callID int) error {
+func acceptCall(conn *dbus.Conn, callObj dbus.BusObject) error {
-	// Create dbus-send command
+	call := callObj.Call("org.freedesktop.ModemManager1.Call.Accept", 0)
-	cmd := exec.Command("dbus-send",
+	if call.Err != nil {
-		"--dest=org.freedesktop.ModemManager1",
+		return call.Err
-		"--print-reply",
+	}
-		"--system",
+	return nil
-		"--type=method_call",
-		fmt.Sprintf("/org/freedesktop/ModemManager1/Call/%d", callID),
-		"org.freedesktop.ModemManager1.Call.Accept",
-	)
-	// Run command and return errpr
-	return cmd.Run()
 }
 
-func declineCall(callID int) error {
+func declineCall(conn *dbus.Conn, callObj dbus.BusObject) error {
-	// Create dbus-send command
+	call := callObj.Call("org.freedesktop.ModemManager1.Call.Hangup", 0)
-	cmd := exec.Command("dbus-send",
+	if call.Err != nil {
-		"--dest=org.freedesktop.ModemManager1",
+		return call.Err
-		"--print-reply",
+	}
-		"--system",
+	return nil
-		"--type=method_call",
-		fmt.Sprintf("/org/freedesktop/ModemManager1/Call/%d", callID),
-		"org.freedesktop.ModemManager1.Call.Hangup",
-	)
-	// Run command and return errpr
-	return cmd.Run()
 }

dbus.go

@@ -0,0 +1,37 @@
+package main
+
+import "github.com/godbus/dbus/v5"
+
+func newSystemBusConn() (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SystemBusPrivate()
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}
+
+func newSessionBusConn() (*dbus.Conn, error) {
+	// Connect to dbus session bus
+	conn, err := dbus.SessionBusPrivate()
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Auth(nil)
+	if err != nil {
+		return nil, err
+	}
+	err = conn.Hello()
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}