/usr/share/gocode/src/github.com/jacobsa/gcloud/gcs/reqtrace_bucket.go is in golang-github-jacobsa-gcloud-dev 0.0~git20150709-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | // Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 gcs
import (
"errors"
"fmt"
"io"
"github.com/jacobsa/reqtrace"
"golang.org/x/net/context"
)
// A bucket that uses reqtrace.Trace to annotate calls.
type reqtraceBucket struct {
Wrapped Bucket
}
////////////////////////////////////////////////////////////////////////
// Reporting reader
////////////////////////////////////////////////////////////////////////
// An io.ReadCloser that reports the outcome of the read operation represented
// by the wrapped io.ReadCloser once it is known.
type reportingReadCloser struct {
Wrapped io.ReadCloser
// Set to nil after it is called.
Report reqtrace.ReportFunc
}
func (rc *reportingReadCloser) Read(p []byte) (n int, err error) {
// Have we already seen an error? Make sure we don't get ourselves into a
// state where we report twice.
if rc.Report == nil {
err = errors.New("reportingReadCloser already reported its outcome")
return
}
// Call through.
n, err = rc.Wrapped.Read(p)
// Special case: we don't treat EOF as an error, because the user should
// follow up with a call to Close.
if err == io.EOF {
return
}
// Report other errors.
if err != nil {
rc.Report(err)
rc.Report = nil
return
}
return
}
func (rc *reportingReadCloser) Close() (err error) {
// Have we already seen an error? Make sure we don't get ourselves into a
// state where we report twice.
if rc.Report == nil {
err = errors.New("reportingReadCloser already reported its outcome")
return
}
// Call through.
err = rc.Wrapped.Close()
// Report the outcome.
rc.Report(err)
rc.Report = nil
return
}
////////////////////////////////////////////////////////////////////////
// Bucket interface
////////////////////////////////////////////////////////////////////////
func (b *reqtraceBucket) Name() string {
return b.Wrapped.Name()
}
func (b *reqtraceBucket) NewReader(
ctx context.Context,
req *ReadObjectRequest) (rc io.ReadCloser, err error) {
var report reqtrace.ReportFunc
// Start a span.
desc := fmt.Sprintf("Read: %s", sanitizeObjectName(req.Name))
ctx, report = reqtrace.StartSpan(ctx, desc)
// Call the wrapped bucket.
rc, err = b.Wrapped.NewReader(ctx, req)
// If the bucket failed, we must report that now.
if err != nil {
report(err)
return
}
// Snoop on the outcome.
rc = &reportingReadCloser{
Wrapped: rc,
Report: report,
}
return
}
func (b *reqtraceBucket) CreateObject(
ctx context.Context,
req *CreateObjectRequest) (o *Object, err error) {
desc := fmt.Sprintf("CreateObject: %s", sanitizeObjectName(req.Name))
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
o, err = b.Wrapped.CreateObject(ctx, req)
return
}
func (b *reqtraceBucket) CopyObject(
ctx context.Context,
req *CopyObjectRequest) (o *Object, err error) {
desc := fmt.Sprintf("CopyObject: %q -> %q", req.SrcName, req.DstName)
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
o, err = b.Wrapped.CopyObject(ctx, req)
return
}
func (b *reqtraceBucket) ComposeObjects(
ctx context.Context,
req *ComposeObjectsRequest) (o *Object, err error) {
desc := fmt.Sprintf("ComposeObjects: -> %q", req.DstName)
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
o, err = b.Wrapped.ComposeObjects(ctx, req)
return
}
func (b *reqtraceBucket) StatObject(
ctx context.Context,
req *StatObjectRequest) (o *Object, err error) {
desc := fmt.Sprintf("StatObject: %s", sanitizeObjectName(req.Name))
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
o, err = b.Wrapped.StatObject(ctx, req)
return
}
func (b *reqtraceBucket) ListObjects(
ctx context.Context,
req *ListObjectsRequest) (listing *Listing, err error) {
desc := fmt.Sprintf("ListObjects")
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
listing, err = b.Wrapped.ListObjects(ctx, req)
return
}
func (b *reqtraceBucket) UpdateObject(
ctx context.Context,
req *UpdateObjectRequest) (o *Object, err error) {
desc := fmt.Sprintf("UpdateObject: %s", sanitizeObjectName(req.Name))
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
o, err = b.Wrapped.UpdateObject(ctx, req)
return
}
func (b *reqtraceBucket) DeleteObject(
ctx context.Context,
req *DeleteObjectRequest) (err error) {
desc := fmt.Sprintf("DeleteObject: %s", sanitizeObjectName(req.Name))
defer reqtrace.StartSpanWithError(&ctx, &err, desc)()
err = b.Wrapped.DeleteObject(ctx, req)
return
}
////////////////////////////////////////////////////////////////////////
// Helpers
////////////////////////////////////////////////////////////////////////
func sanitizeObjectName(
name string) (sanitized string) {
sanitized = fmt.Sprintf("%q", name)
return
}
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