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device.go
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device.go
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// Copyright (C) 2017 Google Inc.
//
// 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 job
import (
"context"
"fmt"
"reflect"
"sync"
"github.com/google/gapid/core/event"
"github.com/google/gapid/core/os/device"
"github.com/google/gapid/test/robot/record"
"github.com/google/gapid/test/robot/search"
"github.com/google/gapid/test/robot/search/eval"
)
type devices struct {
mu sync.Mutex
ledger record.Ledger
entries []*Device
byID map[string]*Device
onChange event.Broadcast
}
func (l *devices) init(ctx context.Context, library record.Library) error {
ledger, err := library.Open(ctx, "devices", &Device{})
if err != nil {
return err
}
l.ledger = ledger
l.byID = map[string]*Device{}
apply := event.AsHandler(ctx, l.apply)
if err := ledger.Read(ctx, apply); err != nil {
return err
}
ledger.Watch(ctx, apply)
return nil
}
func (l *devices) apply(ctx context.Context, entry *Device) error {
l.entries = append(l.entries, entry)
l.byID[entry.Id] = entry
l.onChange.Send(ctx, entry)
return nil
}
func (l *devices) search(ctx context.Context, query *search.Query, handler DeviceHandler) error {
filter := eval.Filter(ctx, query, reflect.TypeOf(&Device{}), event.AsHandler(ctx, handler))
initial := event.AsProducer(ctx, l.entries)
if query.Monitor {
return event.Monitor(ctx, &l.mu, l.onChange.Listen, initial, filter)
}
return event.Feed(ctx, filter, initial)
}
func (l *devices) uniqueName(ctx context.Context, name string) string {
index := 0
id := name
for {
if _, found := l.byID[id]; !found {
return id
}
index++
id = fmt.Sprintf("%s-%d", name, index)
}
}
func sameDevice(match *Device, info *device.Instance) bool {
if match == nil {
return info == nil
}
if info == nil {
return false
}
return match.Information.SameAs(info)
}
func (l *devices) find(ctx context.Context, info *device.Instance) *Device {
for _, entry := range l.entries {
if sameDevice(entry, info) {
return entry
}
}
return nil
}
func (l *devices) get(ctx context.Context, info *device.Instance) (*Device, error) {
if info == nil {
return nil, nil
}
l.mu.Lock()
defer l.mu.Unlock()
entry := l.find(ctx, info)
if entry == nil {
entry = &Device{
Id: l.uniqueName(ctx, info.Id.ID().String()),
Information: info,
}
if err := l.ledger.Add(ctx, entry); err != nil {
return nil, err
}
}
return entry, nil
}