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linux: do not randomize order of returned discovered services/chars

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Previously the list of services and characteristics wasn't sorted, and
because of the way Go maps work they were in fact randomized.
This commit fixes the sorting for services and characteristics, which
both suffered from the same lack of sorting.

This fixes https://github.com/tinygo-org/bluetooth/issues/135.
This commit is contained in:
Ayke van Laethem 2023-05-04 21:33:45 +02:00 committed by Ron Evans
parent 5717af56e0
commit 8260f2fb93
1 changed files with 18 additions and 6 deletions
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24
gattc_linux.go
View file

@ -5,9 +5,11 @@ package bluetooth
import (
"errors"
"sort"
"strings"
"time"
"github.com/godbus/dbus/v5"
"github.com/muka/go-bluetooth/bluez"
"github.com/muka/go-bluetooth/bluez/profile/gatt"
)
@ -70,15 +72,20 @@ func (d *Device) DiscoverServices(uuids []UUID) ([]DeviceService, error) {
if err != nil {
return nil, err
}
objects := make([]string, 0, len(list))
for objectPath := range list {
if !strings.HasPrefix(string(objectPath), string(d.device.Path())+"/service") {
objects = append(objects, string(objectPath))
}
sort.Strings(objects)
for _, objectPath := range objects {
if !strings.HasPrefix(objectPath, string(d.device.Path())+"/service") {
continue
}
suffix := string(objectPath)[len(d.device.Path()+"/"):]
suffix := objectPath[len(d.device.Path()+"/"):]
if len(strings.Split(suffix, "/")) != 1 {
continue
}
service, err := gatt.NewGattService1(objectPath)
service, err := gatt.NewGattService1(dbus.ObjectPath(objectPath))
if err != nil {
return nil, err
}
@ -160,15 +167,20 @@ func (s *DeviceService) DiscoverCharacteristics(uuids []UUID) ([]DeviceCharacter
if err != nil {
return nil, err
}
objects := make([]string, 0, len(list))
for objectPath := range list {
if !strings.HasPrefix(string(objectPath), string(s.service.Path())+"/char") {
objects = append(objects, string(objectPath))
}
sort.Strings(objects)
for _, objectPath := range objects {
if !strings.HasPrefix(objectPath, string(s.service.Path())+"/char") {
continue
}
suffix := string(objectPath)[len(s.service.Path()+"/"):]
suffix := objectPath[len(s.service.Path()+"/"):]
if len(strings.Split(suffix, "/")) != 1 {
continue
}
characteristic, err := gatt.NewGattCharacteristic1(objectPath)
characteristic, err := gatt.NewGattCharacteristic1(dbus.ObjectPath(objectPath))
if err != nil {
return nil, err
}