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factory.go
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factory.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 stash
import (
"context"
"net/url"
"runtime"
"strings"
"github.com/google/gapid/core/log"
)
// Builder is the function type that opens a stash from a url.
type Builder func(context.Context, *url.URL) (*Client, error)
var schemeMap = map[string]Builder{}
// ReigsterHandler adds a new scheme handler to the factory.
func RegisterHandler(scheme string, builder Builder) {
//TODO: complain about duplicates?
schemeMap[scheme] = builder
}
// Dial returns a new client for the given url.
func Dial(ctx context.Context, location *url.URL) (*Client, error) {
ctx = log.V{"Store": location.Path}.Bind(ctx)
if location.Scheme == "" {
switch {
case location.Host != "":
location.Scheme = "grpc"
case location.Path == "":
location.Scheme = "memory"
default:
location.Scheme = "file"
}
}
if location.Scheme == "file" {
if runtime.GOOS == "windows" && strings.IndexByte(location.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
location.Path = strings.TrimPrefix(location.Path, "/")
}
}
builder, found := schemeMap[location.Scheme]
if !found {
return nil, log.Errf(ctx, nil, "Invalid stash scheme")
}
return builder(ctx, location)
}