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local.go
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local.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 subject
import (
"context"
"reflect"
"sync"
"github.com/google/gapid/core/event"
"github.com/google/gapid/core/log"
"github.com/google/gapid/core/os/android/apk"
"github.com/google/gapid/test/robot/record"
"github.com/google/gapid/test/robot/search"
"github.com/google/gapid/test/robot/search/eval"
"github.com/google/gapid/test/robot/stash"
)
type local struct {
mu sync.Mutex
store *stash.Client
ledger record.Ledger
subjects []*Subject
byID map[string]*Subject
onChange event.Broadcast
}
// NewLocal returns a new persistent store of Subjects.
func NewLocal(ctx context.Context, library record.Library, store *stash.Client) (Subjects, error) {
ledger, err := library.Open(ctx, "subjects", &Subject{})
if err != nil {
return nil, err
}
s := &local{
store: store,
ledger: ledger,
subjects: []*Subject{},
byID: map[string]*Subject{},
}
apply := event.AsHandler(ctx, s.apply)
if err := s.ledger.Read(ctx, apply); err != nil {
return nil, err
}
s.ledger.Watch(ctx, apply)
return s, nil
}
// apply is called with items coming out of the ledger
// it should be called with the mutation lock already held.
func (s *local) apply(ctx context.Context, subject *Subject) error {
old := s.byID[subject.Id]
if old == nil {
s.subjects = append(s.subjects, subject)
s.byID[subject.Id] = subject
s.onChange.Send(ctx, subject)
return nil
}
if subject.Hints != nil {
if old.Hints.TraceTime != subject.Hints.TraceTime {
old.Hints.TraceTime = subject.Hints.TraceTime
}
if old.Hints.API != subject.Hints.API {
old.Hints.API = subject.Hints.API
}
}
s.onChange.Send(ctx, old)
return nil
}
// Search implements Subjects.Search
// It searches the set of persisted subjects, and supports monitoring of subjects as they arrive.
func (s *local) Search(ctx context.Context, query *search.Query, handler Handler) error {
filter := eval.Filter(ctx, query, reflect.TypeOf(&Subject{}), event.AsHandler(ctx, handler))
initial := event.AsProducer(ctx, s.subjects)
if query.Monitor {
return event.Monitor(ctx, &s.mu, s.onChange.Listen, initial, filter)
}
return event.Feed(ctx, filter, initial)
}
// Add implements Subjects.Add
func (s *local) Add(ctx context.Context, id string, obbID string, hints *Hints) (*Subject, bool, error) {
s.mu.Lock()
defer s.mu.Unlock()
if subject, ok := s.byID[id]; ok {
return subject, false, nil
}
data, err := s.store.Read(ctx, id)
if err != nil {
return nil, false, err
}
if len(data) == 0 {
return nil, false, nil
}
// TODO: support non apk subjects
info, err := apk.Analyze(ctx, data)
if err != nil {
return nil, false, err
}
subject := &Subject{
Id: id,
Information: &Subject_APK{
APK: info,
},
Hints: hints,
Obb: obbID,
}
if err := s.ledger.Add(ctx, subject); err != nil {
return nil, false, err
}
return subject, true, nil
}
func (s *local) Update(ctx context.Context, subj *Subject) (*Subject, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, found := s.byID[subj.Id]; !found {
return nil, log.Err(ctx, nil, "Subject not found")
}
if err := s.ledger.Add(ctx, subj); err != nil {
return nil, err
}
return s.byID[subj.Id], nil
}