/
bucket.go
107 lines (87 loc) · 2.28 KB
/
bucket.go
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// Copyright 2015 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// 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 main
import (
"context"
"fmt"
"io/ioutil"
"sync"
"time"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"github.com/jacobsa/gcloud/gcs"
)
var g_bucketOnce sync.Once
var g_bucket gcs.Bucket
func makeTokenSource(
ctx context.Context) (ts oauth2.TokenSource, err error) {
cfg := getConfig()
// Attempt to read the JSON file.
contents, err := ioutil.ReadFile(cfg.KeyFile)
if err != nil {
err = fmt.Errorf("ReadFile(%q): %v", cfg.KeyFile, err)
return
}
// Create a config struct based on its contents.
jwtConfig, err := google.JWTConfigFromJSON(contents, gcs.Scope_FullControl)
if err != nil {
err = fmt.Errorf("JWTConfigFromJSON: %v", err)
return
}
// Create the token source.
ts = jwtConfig.TokenSource(ctx)
return
}
func makeBucket(ctx context.Context) (bucket gcs.Bucket, err error) {
cfg := getConfig()
// Create an oauth2 token source.
tokenSrc, err := makeTokenSource(ctx)
if err != nil {
err = fmt.Errorf("makeTokenSource: %v", err)
return
}
// Turn that into a connection.
connCfg := &gcs.ConnConfig{
TokenSource: tokenSrc,
MaxBackoffSleep: time.Minute,
}
conn, err := gcs.NewConn(connCfg)
if err != nil {
err = fmt.Errorf("NewConn: %v", err)
return
}
// Grab the bucket.
bucket, err = conn.OpenBucket(
ctx,
&gcs.OpenBucketOptions{
Name: cfg.BucketName,
})
if err != nil {
err = fmt.Errorf("OpenBucket: %v", err)
return
}
return
}
func initBucket(ctx context.Context) {
var err error
g_bucket, err = makeBucket(ctx)
if err != nil {
panic(err)
}
}
func getBucket(ctx context.Context) gcs.Bucket {
g_bucketOnce.Do(func() { initBucket(ctx) })
return g_bucket
}