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shelf.go
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shelf.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 record
import (
"context"
"net/url"
"runtime"
"strings"
"github.com/google/gapid/core/log"
"github.com/google/gapid/core/os/file"
)
// Shelf is the interface to an object that maintains a set of ledgers stored in a
// consistent way.
type Shelf interface {
// Open is used to open a ledger by name.
// All records in the ledger must be of the same type as the null value.
Open(ctx context.Context, name string, null interface{}) (Ledger, error)
// Create is used to make and return a new ledger in the shelf.
// All records in the ledger must be of the same type as the null value.
Create(ctx context.Context, name string, null interface{}) (Ledger, error)
}
// NewShelf returns a new record shelf from the supplied url.
// The type of shelf will depend on the url given.
func NewShelf(ctx context.Context, shelfURL *url.URL) (Shelf, error) {
ctx = log.V{"ShelfURL": shelfURL.Path}.Bind(ctx)
switch shelfURL.Scheme {
case "", "file":
if shelfURL.Host != "" {
return nil, log.Err(ctx, nil, "Host not supported for file shelves")
}
if shelfURL.Path == "" {
return nil, log.Err(ctx, nil, "Path must be specified for file shelves")
}
if runtime.GOOS == "windows" && strings.IndexByte(shelfURL.Path, ':') == 2 {
// windows file urls have an extra slash before the volume label that needs to be removed
// see https://github.com/golang/go/issues/6027#issuecomment-66083310
shelfURL.Path = strings.TrimPrefix(shelfURL.Path, "/")
}
log.I(ctx, "Build a file record shelf on %s", shelfURL.Path)
return NewFileShelf(ctx, file.Abs(shelfURL.Path))
case "memory":
log.I(ctx, "Start an in memory record shelf")
return NewNullShelf(ctx)
default:
return nil, log.Err(ctx, nil, "Unknown record shelf url type")
}
}