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memory.go
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memory.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 local
import (
"bytes"
"context"
"io"
"net/url"
"time"
"github.com/golang/protobuf/ptypes"
"github.com/google/gapid/core/log"
"github.com/google/gapid/test/robot/stash"
)
type memoryStore struct {
entityIndex
data map[string][]byte
}
func init() {
stash.RegisterHandler("memory", DialMemoryService)
}
// DialMemoryService returns a file backed implementation of stash.Service from a url.
func DialMemoryService(ctx context.Context, location *url.URL) (*stash.Client, error) {
if location.Host != "" {
return nil, log.Err(ctx, nil, "Host not supported for memory servers")
}
if location.Path != "" {
//TODO: keep a persistent map of memory services by name?
return nil, log.Err(ctx, nil, "Path not supported for memory servers")
}
return NewMemoryService(), nil
}
// NewMemoryService returns a new purely in memory implementation of Store.
func NewMemoryService() *stash.Client {
store := &memoryStore{data: map[string][]byte{}}
store.entityIndex.init()
return &stash.Client{Service: store}
}
func (s *memoryStore) Close() {}
func (s *memoryStore) Open(ctx context.Context, id string) (io.ReadSeeker, error) {
s.mu.Lock()
defer s.mu.Unlock()
if data, found := s.data[id]; found {
return bytes.NewReader(data), nil
}
return nil, stash.ErrEntityNotFound
}
func (s *memoryStore) Read(ctx context.Context, id string) ([]byte, error) {
s.mu.Lock()
defer s.mu.Unlock()
data, found := s.data[id]
if !found {
return nil, stash.ErrEntityNotFound
}
return data, nil
}
func (s *memoryStore) Create(ctx context.Context, info *stash.Upload) (io.WriteCloser, error) {
s.mu.Lock()
defer s.mu.Unlock()
if _, found := s.byID[info.Id]; found {
return nil, log.Err(ctx, nil, "Stash entity already exists")
}
now, _ := ptypes.TimestampProto(time.Now())
w := &memoryStoreWriter{
store: s,
entity: &stash.Entity{
Upload: info,
Status: stash.Uploading,
Length: 0,
Timestamp: now,
},
}
s.lockedAddEntry(ctx, w.entity)
return w, nil
}
type memoryStoreWriter struct {
store *memoryStore
entity *stash.Entity
buf bytes.Buffer
}
func (w *memoryStoreWriter) Write(b []byte) (int, error) {
return w.buf.Write(b)
}
func (w *memoryStoreWriter) Close() error {
data := w.buf.Bytes()
w.entity.Status = stash.Present
w.entity.Length = int64(len(data))
w.store.data[w.entity.Upload.Id] = data
return nil
}