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rbdplugin: idempotent DeleteVolume

Browse Source 
When the initial DeleteVolume times out (as it does on slow clusters
due to the low 10 second limit), the external-provisioner calls it
again. The CSI standard requires the second call to succeed if the
volume has been deleted in the meantime. This didn't work because
DeleteVolume returned an error when failing to find the volume info
file:

  rbdplugin: E1008 08:05:35.631783       1 utils.go:100] GRPC error: rbd: open err /var/lib/kubelet/plugins/csi-rbdplugin/controller/csi-rbd-622a252c-cad0-11e8-9112-deadbeef0101.json/open /var/lib/kubelet/plugins/csi-rbdplugin/controller/csi-rbd-622a252c-cad0-11e8-9112-deadbeef0101.json: no such file or directory

The fix is to treat a missing volume info file as "volume already
deleted" and return success. To detect this, the original os error
must be wrapped, otherwise the caller of loadVolInfo cannot determine
the root cause.

Note that further work may be needed to make the driver really
resilient, for example there are probably concurrency issues.
But for now this fixes: #82
This commit is contained in:
Patrick Ohly 2018-10-09 12:08:56 +02:00
parent 239f295dd1
commit 25e3a961c3
15 changed files with 1941 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Gopkg.lock generated
View File

@ -48,6 +48,14 @@
revision = "e790cca94e6cc75c7064b1332e63811d4aae1a53"
version = "v1.1"
[[projects]]
digest = "1:7365acd48986e205ccb8652cc746f09c8b7876030d53710ea6ef7d0bd0dcd7ca"
name = "github.com/pkg/errors"
packages = ["."]
pruneopts = ""
revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
version = "v0.8.0"
[[projects]]
branch = "master"
digest = "1:96d281cfaaa12ac602772da38ac85f00d59b1d3aa7bfe69d8ba334d6ee41e3e6"
@ -179,6 +187,7 @@
"github.com/golang/glog",
"github.com/kubernetes-csi/drivers/pkg/csi-common",
"github.com/pborman/uuid",
"github.com/pkg/errors",
"golang.org/x/net/context",
"google.golang.org/grpc/codes",
"google.golang.org/grpc/status",

9
pkg/rbd/controllerserver.go
View File

@ -18,6 +18,7 @@ package rbd
import (
"fmt"
"os"
"os/exec"
"path"
"syscall"
@ -27,6 +28,7 @@ import (
"github.com/golang/glog"
"github.com/kubernetes-csi/drivers/pkg/csi-common"
"github.com/pborman/uuid"
"github.com/pkg/errors"
"golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
@ -156,17 +158,24 @@ func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVol
volumeID := req.GetVolumeId()
rbdVol := &rbdVolume{}
if err := loadVolInfo(volumeID, path.Join(PluginFolder, "controller"), rbdVol); err != nil {
if os.IsNotExist(errors.Cause(err)) {
// Must have been deleted already. This is not an error (idempotency!).
return &csi.DeleteVolumeResponse{}, nil
}
return nil, err
}
volName := rbdVol.VolName
// Deleting rbd image
glog.V(4).Infof("deleting volume %s", volName)
if err := deleteRBDImage(rbdVol, rbdVol.AdminId, req.GetControllerDeleteSecrets()); err != nil {
// TODO: can we detect "already deleted" situations here and proceed?
glog.V(3).Infof("failed to delete rbd image: %s/%s with error: %v", rbdVol.Pool, volName, err)
return nil, err
}
// Removing persistent storage file for the unmapped volume
if err := deleteVolInfo(volumeID, path.Join(PluginFolder, "controller")); err != nil {
// TODO: we can theoretically end up here when two DeleteVolume calls
// get invoked concurrently. Serialize?
return nil, err
}

33
pkg/rbd/rbd_util.go
View File

@ -26,6 +26,7 @@ import (
"time"
"github.com/golang/glog"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/kubernetes/pkg/util/keymutex"
)
@ -131,7 +132,7 @@ func createRBDImage(pOpts *rbdVolume, volSz int, adminId string, credentials map
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to create rbd image: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to create rbd image, command output: %s", string(output))
}
return nil
@ -308,13 +309,13 @@ func persistVolInfo(image string, persistentStoragePath string, volInfo *rbdVolu
fp, err := os.Create(file)
if err != nil {
glog.Errorf("rbd: failed to create persistent storage file %s with error: %v\n", file, err)
return fmt.Errorf("rbd: create err %s/%s", file, err)
return errors.Wrapf(err, "rbd: create error for %s", file)
}
defer fp.Close()
encoder := json.NewEncoder(fp)
if err = encoder.Encode(volInfo); err != nil {
glog.Errorf("rbd: failed to encode volInfo: %+v for file: %s with error: %v\n", volInfo, file, err)
return fmt.Errorf("rbd: encode err: %v", err)
return errors.Wrap(err, "rbd: encode error")
}
glog.Infof("rbd: successfully saved volInfo: %+v into file: %s\n", volInfo, file)
return nil
@ -324,13 +325,13 @@ func loadVolInfo(image string, persistentStoragePath string, volInfo *rbdVolume)
file := path.Join(persistentStoragePath, image+".json")
fp, err := os.Open(file)
if err != nil {
return fmt.Errorf("rbd: open err %s/%s", file, err)
return errors.Wrapf(err, "rbd: open error for %s", file)
}
defer fp.Close()
decoder := json.NewDecoder(fp)
if err = decoder.Decode(volInfo); err != nil {
return fmt.Errorf("rbd: decode err: %v.", err)
return errors.Wrap(err, "rbd: decode error")
}
return nil
@ -342,7 +343,7 @@ func deleteVolInfo(image string, persistentStoragePath string) error {
err := os.Remove(file)
if err != nil {
if err != os.ErrNotExist {
return fmt.Errorf("rbd: error removing file: %s/%s", file, err)
return errors.Wrapf(err, "rbd: error removing file %s", file)
}
}
return nil
@ -353,13 +354,13 @@ func persistSnapInfo(snapshot string, persistentStoragePath string, snapInfo *rb
fp, err := os.Create(file)
if err != nil {
glog.Errorf("rbd: failed to create persistent storage file %s with error: %v\n", file, err)
return fmt.Errorf("rbd: create err %s/%s", file, err)
return errors.Wrapf(err, "rbd: create error for %s", file)
}
defer fp.Close()
encoder := json.NewEncoder(fp)
if err = encoder.Encode(snapInfo); err != nil {
glog.Errorf("rbd: failed to encode snapInfo: %+v for file: %s with error: %v\n", snapInfo, file, err)
return fmt.Errorf("rbd: encode err: %v", err)
return errors.Wrap(err, "rbd: encode error")
}
glog.Infof("rbd: successfully saved snapInfo: %+v into file: %s\n", snapInfo, file)
return nil
@ -369,13 +370,13 @@ func loadSnapInfo(snapshot string, persistentStoragePath string, snapInfo *rbdSn
file := path.Join(persistentStoragePath, snapshot+".json")
fp, err := os.Open(file)
if err != nil {
return fmt.Errorf("rbd: open err %s/%s", file, err)
return errors.Wrapf(err, "rbd: open error for %s", file)
}
defer fp.Close()
decoder := json.NewDecoder(fp)
if err = decoder.Decode(snapInfo); err != nil {
return fmt.Errorf("rbd: decode err: %v.", err)
return errors.Wrap(err, "rbd: decode error")
}
return nil
}
@ -386,7 +387,7 @@ func deleteSnapInfo(snapshot string, persistentStoragePath string) error {
err := os.Remove(file)
if err != nil {
if err != os.ErrNotExist {
return fmt.Errorf("rbd: error removing file: %s/%s", file, err)
return errors.Wrapf(err, "rbd: error removing file %s", file)
}
}
return nil
@ -455,7 +456,7 @@ func protectSnapshot(pOpts *rbdSnapshot, adminId string, credentials map[string]
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to protect snapshot: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to protect snapshot, command output: %s", string(output))
}
return nil
@ -482,7 +483,7 @@ func createSnapshot(pOpts *rbdSnapshot, adminId string, credentials map[string]s
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to create snapshot: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to create snapshot, command output: %s", string(output))
}
return nil
@ -509,7 +510,7 @@ func unprotectSnapshot(pOpts *rbdSnapshot, adminId string, credentials map[strin
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to unprotect snapshot: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to unprotect snapshot, command output: %s", string(output))
}
return nil
@ -536,7 +537,7 @@ func deleteSnapshot(pOpts *rbdSnapshot, adminId string, credentials map[string]s
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to delete snapshot: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to delete snapshot, command output: %s", string(output))
}
return nil
@ -563,7 +564,7 @@ func restoreSnapshot(pVolOpts *rbdVolume, pSnapOpts *rbdSnapshot, adminId string
output, err = execCommand("rbd", args)
if err != nil {
return fmt.Errorf("failed to restore snapshot: %v, command output: %s", err, string(output))
return errors.Wrapf(err, "failed to restore snapshot, command output: %s", string(output))
}
return nil

24
vendor/github.com/pkg/errors/.gitignore generated vendored Normal file
View File

@ -0,0 +1,24 @@
# Compiled Object files, Static and Dynamic libs (Shared Objects)
*.o
*.a
*.so
# Folders
_obj
_test
# Architecture specific extensions/prefixes
*.[568vq]
[568vq].out
*.cgo1.go
*.cgo2.c
_cgo_defun.c
_cgo_gotypes.go
_cgo_export.*
_testmain.go
*.exe
*.test
*.prof

11
vendor/github.com/pkg/errors/.travis.yml generated vendored Normal file
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@ -0,0 +1,11 @@
language: go
go_import_path: github.com/pkg/errors
go:
- 1.4.3
- 1.5.4
- 1.6.2
- 1.7.1
- tip
script:
- go test -v ./...

23
vendor/github.com/pkg/errors/LICENSE generated vendored Normal file
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@ -0,0 +1,23 @@
Copyright (c) 2015, Dave Cheney <dave@cheney.net>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

52
vendor/github.com/pkg/errors/README.md generated vendored Normal file
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@ -0,0 +1,52 @@
# errors [![Travis-CI](https://travis-ci.org/pkg/errors.svg)](https://travis-ci.org/pkg/errors) [![AppVeyor](https://ci.appveyor.com/api/projects/status/b98mptawhudj53ep/branch/master?svg=true)](https://ci.appveyor.com/project/davecheney/errors/branch/master) [![GoDoc](https://godoc.org/github.com/pkg/errors?status.svg)](http://godoc.org/github.com/pkg/errors) [![Report card](https://goreportcard.com/badge/github.com/pkg/errors)](https://goreportcard.com/report/github.com/pkg/errors)
Package errors provides simple error handling primitives.
`go get github.com/pkg/errors`
The traditional error handling idiom in Go is roughly akin to
```go
if err != nil {
return err
}
```
which applied recursively up the call stack results in error reports without context or debugging information. The errors package allows programmers to add context to the failure path in their code in a way that does not destroy the original value of the error.
## Adding context to an error
The errors.Wrap function returns a new error that adds context to the original error. For example
```go
_, err := ioutil.ReadAll(r)
if err != nil {
return errors.Wrap(err, "read failed")
}
```
## Retrieving the cause of an error
Using `errors.Wrap` constructs a stack of errors, adding context to the preceding error. Depending on the nature of the error it may be necessary to reverse the operation of errors.Wrap to retrieve the original error for inspection. Any error value which implements this interface can be inspected by `errors.Cause`.
```go
type causer interface {
Cause() error
}
```
`errors.Cause` will recursively retrieve the topmost error which does not implement `causer`, which is assumed to be the original cause. For example:
```go
switch err := errors.Cause(err).(type) {
case *MyError:
// handle specifically
default:
// unknown error
}
```
[Read the package documentation for more information](https://godoc.org/github.com/pkg/errors).
## Contributing
We welcome pull requests, bug fixes and issue reports. With that said, the bar for adding new symbols to this package is intentionally set high.
Before proposing a change, please discuss your change by raising an issue.
## Licence
BSD-2-Clause

32
vendor/github.com/pkg/errors/appveyor.yml generated vendored Normal file
View File

@ -0,0 +1,32 @@
version: build-{build}.{branch}
clone_folder: C:\gopath\src\github.com\pkg\errors
shallow_clone: true # for startup speed
environment:
GOPATH: C:\gopath
platform:
- x64
# http://www.appveyor.com/docs/installed-software
install:
# some helpful output for debugging builds
- go version
- go env
# pre-installed MinGW at C:\MinGW is 32bit only
# but MSYS2 at C:\msys64 has mingw64
- set PATH=C:\msys64\mingw64\bin;%PATH%
- gcc --version
- g++ --version
build_script:
- go install -v ./...
test_script:
- set PATH=C:\gopath\bin;%PATH%
- go test -v ./...
#artifacts:
# - path: '%GOPATH%\bin\*.exe'
deploy: off

59
vendor/github.com/pkg/errors/bench_test.go generated vendored Normal file
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@ -0,0 +1,59 @@
// +build go1.7
package errors
import (
"fmt"
"testing"
stderrors "errors"
)
func noErrors(at, depth int) error {
if at >= depth {
return stderrors.New("no error")
}
return noErrors(at+1, depth)
}
func yesErrors(at, depth int) error {
if at >= depth {
return New("ye error")
}
return yesErrors(at+1, depth)
}
func BenchmarkErrors(b *testing.B) {
var toperr error
type run struct {
stack int
std bool
}
runs := []run{
{10, false},
{10, true},
{100, false},
{100, true},
{1000, false},
{1000, true},
}
for _, r := range runs {
part := "pkg/errors"
if r.std {
part = "errors"
}
name := fmt.Sprintf("%s-stack-%d", part, r.stack)
b.Run(name, func(b *testing.B) {
var err error
f := yesErrors
if r.std {
f = noErrors
}
b.ReportAllocs()
for i := 0; i < b.N; i++ {
err = f(0, r.stack)
}
b.StopTimer()
toperr = err
})
}
}

269
vendor/github.com/pkg/errors/errors.go generated vendored Normal file
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@ -0,0 +1,269 @@
// Package errors provides simple error handling primitives.
//
// The traditional error handling idiom in Go is roughly akin to
//
// if err != nil {
// return err
// }
//
// which applied recursively up the call stack results in error reports
// without context or debugging information. The errors package allows
// programmers to add context to the failure path in their code in a way
// that does not destroy the original value of the error.
//
// Adding context to an error
//
// The errors.Wrap function returns a new error that adds context to the
// original error by recording a stack trace at the point Wrap is called,
// and the supplied message. For example
//
// _, err := ioutil.ReadAll(r)
// if err != nil {
// return errors.Wrap(err, "read failed")
// }
//
// If additional control is required the errors.WithStack and errors.WithMessage
// functions destructure errors.Wrap into its component operations of annotating
// an error with a stack trace and an a message, respectively.
//
// Retrieving the cause of an error
//
// Using errors.Wrap constructs a stack of errors, adding context to the
// preceding error. Depending on the nature of the error it may be necessary
// to reverse the operation of errors.Wrap to retrieve the original error
// for inspection. Any error value which implements this interface
//
// type causer interface {
// Cause() error
// }
//
// can be inspected by errors.Cause. errors.Cause will recursively retrieve
// the topmost error which does not implement causer, which is assumed to be
// the original cause. For example:
//
// switch err := errors.Cause(err).(type) {
// case *MyError:
// // handle specifically
// default:
// // unknown error
// }
//
// causer interface is not exported by this package, but is considered a part
// of stable public API.
//
// Formatted printing of errors
//
// All error values returned from this package implement fmt.Formatter and can
// be formatted by the fmt package. The following verbs are supported
//
// %s print the error. If the error has a Cause it will be
// printed recursively
// %v see %s
// %+v extended format. Each Frame of the error's StackTrace will
// be printed in detail.
//
// Retrieving the stack trace of an error or wrapper
//
// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
// invoked. This information can be retrieved with the following interface.
//
// type stackTracer interface {
// StackTrace() errors.StackTrace
// }
//
// Where errors.StackTrace is defined as
//
// type StackTrace []Frame
//
// The Frame type represents a call site in the stack trace. Frame supports
// the fmt.Formatter interface that can be used for printing information about
// the stack trace of this error. For example:
//
// if err, ok := err.(stackTracer); ok {
// for _, f := range err.StackTrace() {
// fmt.Printf("%+s:%d", f)
// }
// }
//
// stackTracer interface is not exported by this package, but is considered a part
// of stable public API.
//
// See the documentation for Frame.Format for more details.
package errors
import (
"fmt"
"io"
)
// New returns an error with the supplied message.
// New also records the stack trace at the point it was called.
func New(message string) error {
return &fundamental{
msg: message,
stack: callers(),
}
}
// Errorf formats according to a format specifier and returns the string
// as a value that satisfies error.
// Errorf also records the stack trace at the point it was called.
func Errorf(format string, args ...interface{}) error {
return &fundamental{
msg: fmt.Sprintf(format, args...),
stack: callers(),
}
}
// fundamental is an error that has a message and a stack, but no caller.
type fundamental struct {
msg string
*stack
}
func (f *fundamental) Error() string { return f.msg }
func (f *fundamental) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
io.WriteString(s, f.msg)
f.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, f.msg)
case 'q':
fmt.Fprintf(s, "%q", f.msg)
}
}
// WithStack annotates err with a stack trace at the point WithStack was called.
// If err is nil, WithStack returns nil.
func WithStack(err error) error {
if err == nil {
return nil
}
return &withStack{
err,
callers(),
}
}
type withStack struct {
error
*stack
}
func (w *withStack) Cause() error { return w.error }
func (w *withStack) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v", w.Cause())
w.stack.Format(s, verb)
return
}
fallthrough
case 's':
io.WriteString(s, w.Error())
case 'q':
fmt.Fprintf(s, "%q", w.Error())
}
}
// Wrap returns an error annotating err with a stack trace
// at the point Wrap is called, and the supplied message.
// If err is nil, Wrap returns nil.
func Wrap(err error, message string) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: message,
}
return &withStack{
err,
callers(),
}
}
// Wrapf returns an error annotating err with a stack trace
// at the point Wrapf is call, and the format specifier.
// If err is nil, Wrapf returns nil.
func Wrapf(err error, format string, args ...interface{}) error {
if err == nil {
return nil
}
err = &withMessage{
cause: err,
msg: fmt.Sprintf(format, args...),
}
return &withStack{
err,
callers(),
}
}
// WithMessage annotates err with a new message.
// If err is nil, WithMessage returns nil.
func WithMessage(err error, message string) error {
if err == nil {
return nil
}
return &withMessage{
cause: err,
msg: message,
}
}
type withMessage struct {
cause error
msg string
}
func (w *withMessage) Error() string { return w.msg + ": " + w.cause.Error() }
func (w *withMessage) Cause() error { return w.cause }
func (w *withMessage) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
if s.Flag('+') {
fmt.Fprintf(s, "%+v\n", w.Cause())
io.WriteString(s, w.msg)
return
}
fallthrough
case 's', 'q':
io.WriteString(s, w.Error())
}
}
// Cause returns the underlying cause of the error, if possible.
// An error value has a cause if it implements the following
// interface:
//
// type causer interface {
// Cause() error
// }
//
// If the error does not implement Cause, the original error will
// be returned. If the error is nil, nil will be returned without further
// investigation.
func Cause(err error) error {
type causer interface {
Cause() error
}
for err != nil {
cause, ok := err.(causer)
if !ok {
break
}
err = cause.Cause()
}
return err
}

226
vendor/github.com/pkg/errors/errors_test.go generated vendored Normal file
View File

@ -0,0 +1,226 @@
package errors
import (
"errors"
"fmt"
"io"
"reflect"
"testing"
)
func TestNew(t *testing.T) {
tests := []struct {
err string
want error
}{
{"", fmt.Errorf("")},
{"foo", fmt.Errorf("foo")},
{"foo", New("foo")},
{"string with format specifiers: %v", errors.New("string with format specifiers: %v")},
}
for _, tt := range tests {
got := New(tt.err)
if got.Error() != tt.want.Error() {
t.Errorf("New.Error(): got: %q, want %q", got, tt.want)
}
}
}
func TestWrapNil(t *testing.T) {
got := Wrap(nil, "no error")
if got != nil {
t.Errorf("Wrap(nil, \"no error\"): got %#v, expected nil", got)
}
}
func TestWrap(t *testing.T) {
tests := []struct {
err error
message string
want string
}{
{io.EOF, "read error", "read error: EOF"},
{Wrap(io.EOF, "read error"), "client error", "client error: read error: EOF"},
}
for _, tt := range tests {
got := Wrap(tt.err, tt.message).Error()
if got != tt.want {
t.Errorf("Wrap(%v, %q): got: %v, want %v", tt.err, tt.message, got, tt.want)
}
}
}
type nilError struct{}
func (nilError) Error() string { return "nil error" }
func TestCause(t *testing.T) {
x := New("error")
tests := []struct {
err error
want error
}{{
// nil error is nil
err: nil,
want: nil,
}, {
// explicit nil error is nil
err: (error)(nil),
want: nil,
}, {
// typed nil is nil
err: (*nilError)(nil),
want: (*nilError)(nil),
}, {
// uncaused error is unaffected
err: io.EOF,
want: io.EOF,
}, {
// caused error returns cause
err: Wrap(io.EOF, "ignored"),
want: io.EOF,
}, {
err: x, // return from errors.New
want: x,
}, {
WithMessage(nil, "whoops"),
nil,
}, {
WithMessage(io.EOF, "whoops"),
io.EOF,
}, {
WithStack(nil),
nil,
}, {
WithStack(io.EOF),
io.EOF,
}}
for i, tt := range tests {
got := Cause(tt.err)
if !reflect.DeepEqual(got, tt.want) {
t.Errorf("test %d: got %#v, want %#v", i+1, got, tt.want)
}
}
}
func TestWrapfNil(t *testing.T) {
got := Wrapf(nil, "no error")
if got != nil {
t.Errorf("Wrapf(nil, \"no error\"): got %#v, expected nil", got)
}
}
func TestWrapf(t *testing.T) {
tests := []struct {
err error
message string
want string
}{
{io.EOF, "read error", "read error: EOF"},
{Wrapf(io.EOF, "read error without format specifiers"), "client error", "client error: read error without format specifiers: EOF"},
{Wrapf(io.EOF, "read error with %d format specifier", 1), "client error", "client error: read error with 1 format specifier: EOF"},
}
for _, tt := range tests {
got := Wrapf(tt.err, tt.message).Error()
if got != tt.want {
t.Errorf("Wrapf(%v, %q): got: %v, want %v", tt.err, tt.message, got, tt.want)
}
}
}
func TestErrorf(t *testing.T) {
tests := []struct {
err error
want string
}{
{Errorf("read error without format specifiers"), "read error without format specifiers"},
{Errorf("read error with %d format specifier", 1), "read error with 1 format specifier"},
}
for _, tt := range tests {
got := tt.err.Error()
if got != tt.want {
t.Errorf("Errorf(%v): got: %q, want %q", tt.err, got, tt.want)
}
}
}
func TestWithStackNil(t *testing.T) {
got := WithStack(nil)
if got != nil {
t.Errorf("WithStack(nil): got %#v, expected nil", got)
}
}
func TestWithStack(t *testing.T) {
tests := []struct {
err error
want string
}{
{io.EOF, "EOF"},
{WithStack(io.EOF), "EOF"},
}
for _, tt := range tests {
got := WithStack(tt.err).Error()
if got != tt.want {
t.Errorf("WithStack(%v): got: %v, want %v", tt.err, got, tt.want)
}
}
}
func TestWithMessageNil(t *testing.T) {
got := WithMessage(nil, "no error")
if got != nil {
t.Errorf("WithMessage(nil, \"no error\"): got %#v, expected nil", got)
}
}
func TestWithMessage(t *testing.T) {
tests := []struct {
err error
message string
want string
}{
{io.EOF, "read error", "read error: EOF"},
{WithMessage(io.EOF, "read error"), "client error", "client error: read error: EOF"},
}
for _, tt := range tests {
got := WithMessage(tt.err, tt.message).Error()
if got != tt.want {
t.Errorf("WithMessage(%v, %q): got: %q, want %q", tt.err, tt.message, got, tt.want)
}
}
}
// errors.New, etc values are not expected to be compared by value
// but the change in errors#27 made them incomparable. Assert that
// various kinds of errors have a functional equality operator, even
// if the result of that equality is always false.
func TestErrorEquality(t *testing.T) {
vals := []error{
nil,
io.EOF,
errors.New("EOF"),
New("EOF"),
Errorf("EOF"),
Wrap(io.EOF, "EOF"),
Wrapf(io.EOF, "EOF%d", 2),
WithMessage(nil, "whoops"),
WithMessage(io.EOF, "whoops"),
WithStack(io.EOF),
WithStack(nil),
}
for i := range vals {
for j := range vals {
_ = vals[i] == vals[j] // mustn't panic
}
}
}

205
vendor/github.com/pkg/errors/example_test.go generated vendored Normal file
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@ -0,0 +1,205 @@
package errors_test
import (
"fmt"
"github.com/pkg/errors"
)
func ExampleNew() {
err := errors.New("whoops")
fmt.Println(err)
// Output: whoops
}
func ExampleNew_printf() {
err := errors.New("whoops")
fmt.Printf("%+v", err)
// Example output:
// whoops
// github.com/pkg/errors_test.ExampleNew_printf
// /home/dfc/src/github.com/pkg/errors/example_test.go:17
// testing.runExample
// /home/dfc/go/src/testing/example.go:114
// testing.RunExamples
// /home/dfc/go/src/testing/example.go:38
// testing.(*M).Run
// /home/dfc/go/src/testing/testing.go:744
// main.main
// /github.com/pkg/errors/_test/_testmain.go:106
// runtime.main
// /home/dfc/go/src/runtime/proc.go:183
// runtime.goexit
// /home/dfc/go/src/runtime/asm_amd64.s:2059
}
func ExampleWithMessage() {
cause := errors.New("whoops")
err := errors.WithMessage(cause, "oh noes")
fmt.Println(err)
// Output: oh noes: whoops
}
func ExampleWithStack() {
cause := errors.New("whoops")
err := errors.WithStack(cause)
fmt.Println(err)
// Output: whoops
}
func ExampleWithStack_printf() {
cause := errors.New("whoops")
err := errors.WithStack(cause)
fmt.Printf("%+v", err)
// Example Output:
// whoops
// github.com/pkg/errors_test.ExampleWithStack_printf
// /home/fabstu/go/src/github.com/pkg/errors/example_test.go:55
// testing.runExample
// /usr/lib/go/src/testing/example.go:114
// testing.RunExamples
// /usr/lib/go/src/testing/example.go:38
// testing.(*M).Run
// /usr/lib/go/src/testing/testing.go:744
// main.main
// github.com/pkg/errors/_test/_testmain.go:106
// runtime.main
// /usr/lib/go/src/runtime/proc.go:183
// runtime.goexit
// /usr/lib/go/src/runtime/asm_amd64.s:2086
// github.com/pkg/errors_test.ExampleWithStack_printf
// /home/fabstu/go/src/github.com/pkg/errors/example_test.go:56
// testing.runExample
// /usr/lib/go/src/testing/example.go:114
// testing.RunExamples
// /usr/lib/go/src/testing/example.go:38
// testing.(*M).Run
// /usr/lib/go/src/testing/testing.go:744
// main.main
// github.com/pkg/errors/_test/_testmain.go:106
// runtime.main
// /usr/lib/go/src/runtime/proc.go:183
// runtime.goexit
// /usr/lib/go/src/runtime/asm_amd64.s:2086
}
func ExampleWrap() {
cause := errors.New("whoops")
err := errors.Wrap(cause, "oh noes")
fmt.Println(err)
// Output: oh noes: whoops
}
func fn() error {
e1 := errors.New("error")
e2 := errors.Wrap(e1, "inner")
e3 := errors.Wrap(e2, "middle")
return errors.Wrap(e3, "outer")
}
func ExampleCause() {
err := fn()
fmt.Println(err)
fmt.Println(errors.Cause(err))
// Output: outer: middle: inner: error
// error
}
func ExampleWrap_extended() {
err := fn()
fmt.Printf("%+v\n", err)
// Example output:
// error
// github.com/pkg/errors_test.fn
// /home/dfc/src/github.com/pkg/errors/example_test.go:47
// github.com/pkg/errors_test.ExampleCause_printf
// /home/dfc/src/github.com/pkg/errors/example_test.go:63
// testing.runExample
// /home/dfc/go/src/testing/example.go:114
// testing.RunExamples
// /home/dfc/go/src/testing/example.go:38
// testing.(*M).Run
// /home/dfc/go/src/testing/testing.go:744
// main.main
// /github.com/pkg/errors/_test/_testmain.go:104
// runtime.main
// /home/dfc/go/src/runtime/proc.go:183
// runtime.goexit
// /home/dfc/go/src/runtime/asm_amd64.s:2059
// github.com/pkg/errors_test.fn
// /home/dfc/src/github.com/pkg/errors/example_test.go:48: inner
// github.com/pkg/errors_test.fn
// /home/dfc/src/github.com/pkg/errors/example_test.go:49: middle
// github.com/pkg/errors_test.fn
// /home/dfc/src/github.com/pkg/errors/example_test.go:50: outer
}
func ExampleWrapf() {
cause := errors.New("whoops")
err := errors.Wrapf(cause, "oh noes #%d", 2)
fmt.Println(err)
// Output: oh noes #2: whoops
}
func ExampleErrorf_extended() {
err := errors.Errorf("whoops: %s", "foo")
fmt.Printf("%+v", err)
// Example output:
// whoops: foo
// github.com/pkg/errors_test.ExampleErrorf
// /home/dfc/src/github.com/pkg/errors/example_test.go:101
// testing.runExample
// /home/dfc/go/src/testing/example.go:114
// testing.RunExamples
// /home/dfc/go/src/testing/example.go:38
// testing.(*M).Run
// /home/dfc/go/src/testing/testing.go:744
// main.main
// /github.com/pkg/errors/_test/_testmain.go:102
// runtime.main
// /home/dfc/go/src/runtime/proc.go:183
// runtime.goexit
// /home/dfc/go/src/runtime/asm_amd64.s:2059
}
func Example_stackTrace() {
type stackTracer interface {
StackTrace() errors.StackTrace
}
err, ok := errors.Cause(fn()).(stackTracer)
if !ok {
panic("oops, err does not implement stackTracer")
}
st := err.StackTrace()
fmt.Printf("%+v", st[0:2]) // top two frames
// Example output:
// github.com/pkg/errors_test.fn
// /home/dfc/src/github.com/pkg/errors/example_test.go:47
// github.com/pkg/errors_test.Example_stackTrace
// /home/dfc/src/github.com/pkg/errors/example_test.go:127
}
func ExampleCause_printf() {
err := errors.Wrap(func() error {
return func() error {
return errors.Errorf("hello %s", fmt.Sprintf("world"))
}()
}(), "failed")
fmt.Printf("%v", err)
// Output: failed: hello world
}

535
vendor/github.com/pkg/errors/format_test.go generated vendored Normal file
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@ -0,0 +1,535 @@
package errors
import (
"errors"
"fmt"
"io"
"regexp"
"strings"
"testing"
)
func TestFormatNew(t *testing.T) {
tests := []struct {
error
format string
want string
}{{
New("error"),
"%s",
"error",
}, {
New("error"),
"%v",
"error",
}, {
New("error"),
"%+v",
"error\n" +
"github.com/pkg/errors.TestFormatNew\n" +
"\t.+/github.com/pkg/errors/format_test.go:26",
}, {
New("error"),
"%q",
`"error"`,
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.error, tt.format, tt.want)
}
}
func TestFormatErrorf(t *testing.T) {
tests := []struct {
error
format string
want string
}{{
Errorf("%s", "error"),
"%s",
"error",
}, {
Errorf("%s", "error"),
"%v",
"error",
}, {
Errorf("%s", "error"),
"%+v",
"error\n" +
"github.com/pkg/errors.TestFormatErrorf\n" +
"\t.+/github.com/pkg/errors/format_test.go:56",
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.error, tt.format, tt.want)
}
}
func TestFormatWrap(t *testing.T) {
tests := []struct {
error
format string
want string
}{{
Wrap(New("error"), "error2"),
"%s",
"error2: error",
}, {
Wrap(New("error"), "error2"),
"%v",
"error2: error",
}, {
Wrap(New("error"), "error2"),
"%+v",
"error\n" +
"github.com/pkg/errors.TestFormatWrap\n" +
"\t.+/github.com/pkg/errors/format_test.go:82",
}, {
Wrap(io.EOF, "error"),
"%s",
"error: EOF",
}, {
Wrap(io.EOF, "error"),
"%v",
"error: EOF",
}, {
Wrap(io.EOF, "error"),
"%+v",
"EOF\n" +
"error\n" +
"github.com/pkg/errors.TestFormatWrap\n" +
"\t.+/github.com/pkg/errors/format_test.go:96",
}, {
Wrap(Wrap(io.EOF, "error1"), "error2"),
"%+v",
"EOF\n" +
"error1\n" +
"github.com/pkg/errors.TestFormatWrap\n" +
"\t.+/github.com/pkg/errors/format_test.go:103\n",
}, {
Wrap(New("error with space"), "context"),
"%q",
`"context: error with space"`,
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.error, tt.format, tt.want)
}
}
func TestFormatWrapf(t *testing.T) {
tests := []struct {
error
format string
want string
}{{
Wrapf(io.EOF, "error%d", 2),
"%s",
"error2: EOF",
}, {
Wrapf(io.EOF, "error%d", 2),
"%v",
"error2: EOF",
}, {
Wrapf(io.EOF, "error%d", 2),
"%+v",
"EOF\n" +
"error2\n" +
"github.com/pkg/errors.TestFormatWrapf\n" +
"\t.+/github.com/pkg/errors/format_test.go:134",
}, {
Wrapf(New("error"), "error%d", 2),
"%s",
"error2: error",
}, {
Wrapf(New("error"), "error%d", 2),
"%v",
"error2: error",
}, {
Wrapf(New("error"), "error%d", 2),
"%+v",
"error\n" +
"github.com/pkg/errors.TestFormatWrapf\n" +
"\t.+/github.com/pkg/errors/format_test.go:149",
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.error, tt.format, tt.want)
}
}
func TestFormatWithStack(t *testing.T) {
tests := []struct {
error
format string
want []string
}{{
WithStack(io.EOF),
"%s",
[]string{"EOF"},
}, {
WithStack(io.EOF),
"%v",
[]string{"EOF"},
}, {
WithStack(io.EOF),
"%+v",
[]string{"EOF",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:175"},
}, {
WithStack(New("error")),
"%s",
[]string{"error"},
}, {
WithStack(New("error")),
"%v",
[]string{"error"},
}, {
WithStack(New("error")),
"%+v",
[]string{"error",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:189",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:189"},
}, {
WithStack(WithStack(io.EOF)),
"%+v",
[]string{"EOF",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:197",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:197"},
}, {
WithStack(WithStack(Wrapf(io.EOF, "message"))),
"%+v",
[]string{"EOF",
"message",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:205",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:205",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:205"},
}, {
WithStack(Errorf("error%d", 1)),
"%+v",
[]string{"error1",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:216",
"github.com/pkg/errors.TestFormatWithStack\n" +
"\t.+/github.com/pkg/errors/format_test.go:216"},
}}
for i, tt := range tests {
testFormatCompleteCompare(t, i, tt.error, tt.format, tt.want, true)
}
}
func TestFormatWithMessage(t *testing.T) {
tests := []struct {
error
format string
want []string
}{{
WithMessage(New("error"), "error2"),
"%s",
[]string{"error2: error"},
}, {
WithMessage(New("error"), "error2"),
"%v",
[]string{"error2: error"},
}, {
WithMessage(New("error"), "error2"),
"%+v",
[]string{
"error",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:244",
"error2"},
}, {
WithMessage(io.EOF, "addition1"),
"%s",
[]string{"addition1: EOF"},
}, {
WithMessage(io.EOF, "addition1"),
"%v",
[]string{"addition1: EOF"},
}, {
WithMessage(io.EOF, "addition1"),
"%+v",
[]string{"EOF", "addition1"},
}, {
WithMessage(WithMessage(io.EOF, "addition1"), "addition2"),
"%v",
[]string{"addition2: addition1: EOF"},
}, {
WithMessage(WithMessage(io.EOF, "addition1"), "addition2"),
"%+v",
[]string{"EOF", "addition1", "addition2"},
}, {
Wrap(WithMessage(io.EOF, "error1"), "error2"),
"%+v",
[]string{"EOF", "error1", "error2",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:272"},
}, {
WithMessage(Errorf("error%d", 1), "error2"),
"%+v",
[]string{"error1",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:278",
"error2"},
}, {
WithMessage(WithStack(io.EOF), "error"),
"%+v",
[]string{
"EOF",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:285",
"error"},
}, {
WithMessage(Wrap(WithStack(io.EOF), "inside-error"), "outside-error"),
"%+v",
[]string{
"EOF",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:293",
"inside-error",
"github.com/pkg/errors.TestFormatWithMessage\n" +
"\t.+/github.com/pkg/errors/format_test.go:293",
"outside-error"},
}}
for i, tt := range tests {
testFormatCompleteCompare(t, i, tt.error, tt.format, tt.want, true)
}
}
func TestFormatGeneric(t *testing.T) {
starts := []struct {
err error
want []string
}{
{New("new-error"), []string{
"new-error",
"github.com/pkg/errors.TestFormatGeneric\n" +
"\t.+/github.com/pkg/errors/format_test.go:315"},
}, {Errorf("errorf-error"), []string{
"errorf-error",
"github.com/pkg/errors.TestFormatGeneric\n" +
"\t.+/github.com/pkg/errors/format_test.go:319"},
}, {errors.New("errors-new-error"), []string{
"errors-new-error"},
},
}
wrappers := []wrapper{
{
func(err error) error { return WithMessage(err, "with-message") },
[]string{"with-message"},
}, {
func(err error) error { return WithStack(err) },
[]string{
"github.com/pkg/errors.(func·002|TestFormatGeneric.func2)\n\t" +
".+/github.com/pkg/errors/format_test.go:333",
},
}, {
func(err error) error { return Wrap(err, "wrap-error") },
[]string{
"wrap-error",
"github.com/pkg/errors.(func·003|TestFormatGeneric.func3)\n\t" +
".+/github.com/pkg/errors/format_test.go:339",
},
}, {
func(err error) error { return Wrapf(err, "wrapf-error%d", 1) },
[]string{
"wrapf-error1",
"github.com/pkg/errors.(func·004|TestFormatGeneric.func4)\n\t" +
".+/github.com/pkg/errors/format_test.go:346",
},
},
}
for s := range starts {
err := starts[s].err
want := starts[s].want
testFormatCompleteCompare(t, s, err, "%+v", want, false)
testGenericRecursive(t, err, want, wrappers, 3)
}
}
func testFormatRegexp(t *testing.T, n int, arg interface{}, format, want string) {
got := fmt.Sprintf(format, arg)
gotLines := strings.SplitN(got, "\n", -1)
wantLines := strings.SplitN(want, "\n", -1)
if len(wantLines) > len(gotLines) {
t.Errorf("test %d: wantLines(%d) > gotLines(%d):\n got: %q\nwant: %q", n+1, len(wantLines), len(gotLines), got, want)
return
}
for i, w := range wantLines {
match, err := regexp.MatchString(w, gotLines[i])
if err != nil {
t.Fatal(err)
}
if !match {
t.Errorf("test %d: line %d: fmt.Sprintf(%q, err):\n got: %q\nwant: %q", n+1, i+1, format, got, want)
}
}
}
var stackLineR = regexp.MustCompile(`\.`)
// parseBlocks parses input into a slice, where:
// - incase entry contains a newline, its a stacktrace
// - incase entry contains no newline, its a solo line.
//
// Detecting stack boundaries only works incase the WithStack-calls are
// to be found on the same line, thats why it is optionally here.
//
// Example use:
//
// for _, e := range blocks {
// if strings.ContainsAny(e, "\n") {
// // Match as stack
// } else {
// // Match as line
// }
// }
//
func parseBlocks(input string, detectStackboundaries bool) ([]string, error) {
var blocks []string
stack := ""
wasStack := false
lines := map[string]bool{} // already found lines
for _, l := range strings.Split(input, "\n") {
isStackLine := stackLineR.MatchString(l)
switch {
case !isStackLine && wasStack:
blocks = append(blocks, stack, l)
stack = ""
lines = map[string]bool{}
case isStackLine:
if wasStack {
// Detecting two stacks after another, possible cause lines match in
// our tests due to WithStack(WithStack(io.EOF)) on same line.
if detectStackboundaries {
if lines[l] {
if len(stack) == 0 {
return nil, errors.New("len of block must not be zero here")
}
blocks = append(blocks, stack)
stack = l
lines = map[string]bool{l: true}
continue
}
}
stack = stack + "\n" + l
} else {
stack = l
}
lines[l] = true
case !isStackLine && !wasStack:
blocks = append(blocks, l)
default:
return nil, errors.New("must not happen")
}
wasStack = isStackLine
}
// Use up stack
if stack != "" {
blocks = append(blocks, stack)
}
return blocks, nil
}
func testFormatCompleteCompare(t *testing.T, n int, arg interface{}, format string, want []string, detectStackBoundaries bool) {
gotStr := fmt.Sprintf(format, arg)
got, err := parseBlocks(gotStr, detectStackBoundaries)
if err != nil {
t.Fatal(err)
}
if len(got) != len(want) {
t.Fatalf("test %d: fmt.Sprintf(%s, err) -> wrong number of blocks: got(%d) want(%d)\n got: %s\nwant: %s\ngotStr: %q",
n+1, format, len(got), len(want), prettyBlocks(got), prettyBlocks(want), gotStr)
}
for i := range got {
if strings.ContainsAny(want[i], "\n") {
// Match as stack
match, err := regexp.MatchString(want[i], got[i])
if err != nil {
t.Fatal(err)
}
if !match {
t.Fatalf("test %d: block %d: fmt.Sprintf(%q, err):\ngot:\n%q\nwant:\n%q\nall-got:\n%s\nall-want:\n%s\n",
n+1, i+1, format, got[i], want[i], prettyBlocks(got), prettyBlocks(want))
}
} else {
// Match as message
if got[i] != want[i] {
t.Fatalf("test %d: fmt.Sprintf(%s, err) at block %d got != want:\n got: %q\nwant: %q", n+1, format, i+1, got[i], want[i])
}
}
}
}
type wrapper struct {
wrap func(err error) error
want []string
}
func prettyBlocks(blocks []string, prefix ...string) string {
var out []string
for _, b := range blocks {
out = append(out, fmt.Sprintf("%v", b))
}
return " " + strings.Join(out, "\n ")
}
func testGenericRecursive(t *testing.T, beforeErr error, beforeWant []string, list []wrapper, maxDepth int) {
if len(beforeWant) == 0 {
panic("beforeWant must not be empty")
}
for _, w := range list {
if len(w.want) == 0 {
panic("want must not be empty")
}
err := w.wrap(beforeErr)
// Copy required cause append(beforeWant, ..) modified beforeWant subtly.
beforeCopy := make([]string, len(beforeWant))
copy(beforeCopy, beforeWant)
beforeWant := beforeCopy
last := len(beforeWant) - 1
var want []string
// Merge two stacks behind each other.
if strings.ContainsAny(beforeWant[last], "\n") && strings.ContainsAny(w.want[0], "\n") {
want = append(beforeWant[:last], append([]string{beforeWant[last] + "((?s).*)" + w.want[0]}, w.want[1:]...)...)
} else {
want = append(beforeWant, w.want...)
}
testFormatCompleteCompare(t, maxDepth, err, "%+v", want, false)
if maxDepth > 0 {
testGenericRecursive(t, err, want, list, maxDepth-1)
}
}
}

178
vendor/github.com/pkg/errors/stack.go generated vendored Normal file
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@ -0,0 +1,178 @@
package errors
import (
"fmt"
"io"
"path"
"runtime"
"strings"
)
// Frame represents a program counter inside a stack frame.
type Frame uintptr
// pc returns the program counter for this frame;
// multiple frames may have the same PC value.
func (f Frame) pc() uintptr { return uintptr(f) - 1 }
// file returns the full path to the file that contains the
// function for this Frame's pc.
func (f Frame) file() string {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return "unknown"
}
file, _ := fn.FileLine(f.pc())
return file
}
// line returns the line number of source code of the
// function for this Frame's pc.
func (f Frame) line() int {
fn := runtime.FuncForPC(f.pc())
if fn == nil {
return 0
}
_, line := fn.FileLine(f.pc())
return line
}
// Format formats the frame according to the fmt.Formatter interface.
//
// %s source file
// %d source line
// %n function name
// %v equivalent to %s:%d
//
// Format accepts flags that alter the printing of some verbs, as follows:
//
// %+s path of source file relative to the compile time GOPATH
// %+v equivalent to %+s:%d
func (f Frame) Format(s fmt.State, verb rune) {
switch verb {
case 's':
switch {
case s.Flag('+'):
pc := f.pc()
fn := runtime.FuncForPC(pc)
if fn == nil {
io.WriteString(s, "unknown")
} else {
file, _ := fn.FileLine(pc)
fmt.Fprintf(s, "%s\n\t%s", fn.Name(), file)
}
default:
io.WriteString(s, path.Base(f.file()))
}
case 'd':
fmt.Fprintf(s, "%d", f.line())
case 'n':
name := runtime.FuncForPC(f.pc()).Name()
io.WriteString(s, funcname(name))
case 'v':
f.Format(s, 's')
io.WriteString(s, ":")
f.Format(s, 'd')
}
}
// StackTrace is stack of Frames from innermost (newest) to outermost (oldest).
type StackTrace []Frame
func (st StackTrace) Format(s fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case s.Flag('+'):
for _, f := range st {
fmt.Fprintf(s, "\n%+v", f)
}
case s.Flag('#'):
fmt.Fprintf(s, "%#v", []Frame(st))
default:
fmt.Fprintf(s, "%v", []Frame(st))
}
case 's':
fmt.Fprintf(s, "%s", []Frame(st))
}
}
// stack represents a stack of program counters.
type stack []uintptr
func (s *stack) Format(st fmt.State, verb rune) {
switch verb {
case 'v':
switch {
case st.Flag('+'):
for _, pc := range *s {
f := Frame(pc)
fmt.Fprintf(st, "\n%+v", f)
}
}
}
}
func (s *stack) StackTrace() StackTrace {
f := make([]Frame, len(*s))
for i := 0; i < len(f); i++ {
f[i] = Frame((*s)[i])
}
return f
}
func callers() *stack {
const depth = 32
var pcs [depth]uintptr
n := runtime.Callers(3, pcs[:])
var st stack = pcs[0:n]
return &st
}
// funcname removes the path prefix component of a function's name reported by func.Name().
func funcname(name string) string {
i := strings.LastIndex(name, "/")
name = name[i+1:]
i = strings.Index(name, ".")
return name[i+1:]
}
func trimGOPATH(name, file string) string {
// Here we want to get the source file path relative to the compile time
// GOPATH. As of Go 1.6.x there is no direct way to know the compiled
// GOPATH at runtime, but we can infer the number of path segments in the
// GOPATH. We note that fn.Name() returns the function name qualified by
// the import path, which does not include the GOPATH. Thus we can trim
// segments from the beginning of the file path until the number of path
// separators remaining is one more than the number of path separators in
// the function name. For example, given:
//
// GOPATH /home/user
// file /home/user/src/pkg/sub/file.go
// fn.Name() pkg/sub.Type.Method
//
// We want to produce:
//
// pkg/sub/file.go
//
// From this we can easily see that fn.Name() has one less path separator
// than our desired output. We count separators from the end of the file
// path until it finds two more than in the function name and then move
// one character forward to preserve the initial path segment without a
// leading separator.
const sep = "/"
goal := strings.Count(name, sep) + 2
i := len(file)
for n := 0; n < goal; n++ {
i = strings.LastIndex(file[:i], sep)
if i == -1 {
// not enough separators found, set i so that the slice expression
// below leaves file unmodified
i = -len(sep)
break
}
}
// get back to 0 or trim the leading separator
file = file[i+len(sep):]
return file
}

292
vendor/github.com/pkg/errors/stack_test.go generated vendored Normal file
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@ -0,0 +1,292 @@
package errors
import (
"fmt"
"runtime"
"testing"
)
var initpc, _, _, _ = runtime.Caller(0)
func TestFrameLine(t *testing.T) {
var tests = []struct {
Frame
want int
}{{
Frame(initpc),
9,
}, {
func() Frame {
var pc, _, _, _ = runtime.Caller(0)
return Frame(pc)
}(),
20,
}, {
func() Frame {
var pc, _, _, _ = runtime.Caller(1)
return Frame(pc)
}(),
28,
}, {
Frame(0), // invalid PC
0,
}}
for _, tt := range tests {
got := tt.Frame.line()
want := tt.want
if want != got {
t.Errorf("Frame(%v): want: %v, got: %v", uintptr(tt.Frame), want, got)
}
}
}
type X struct{}
func (x X) val() Frame {
var pc, _, _, _ = runtime.Caller(0)
return Frame(pc)
}
func (x *X) ptr() Frame {
var pc, _, _, _ = runtime.Caller(0)
return Frame(pc)
}
func TestFrameFormat(t *testing.T) {
var tests = []struct {
Frame
format string
want string
}{{
Frame(initpc),
"%s",
"stack_test.go",
}, {
Frame(initpc),
"%+s",
"github.com/pkg/errors.init\n" +
"\t.+/github.com/pkg/errors/stack_test.go",
}, {
Frame(0),
"%s",
"unknown",
}, {
Frame(0),
"%+s",
"unknown",
}, {
Frame(initpc),
"%d",
"9",
}, {
Frame(0),
"%d",
"0",
}, {
Frame(initpc),
"%n",
"init",
}, {
func() Frame {
var x X
return x.ptr()
}(),
"%n",
`\(\*X\).ptr`,
}, {
func() Frame {
var x X
return x.val()
}(),
"%n",
"X.val",
}, {
Frame(0),
"%n",
"",
}, {
Frame(initpc),
"%v",
"stack_test.go:9",
}, {
Frame(initpc),
"%+v",
"github.com/pkg/errors.init\n" +
"\t.+/github.com/pkg/errors/stack_test.go:9",
}, {
Frame(0),
"%v",
"unknown:0",
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.Frame, tt.format, tt.want)
}
}
func TestFuncname(t *testing.T) {
tests := []struct {
name, want string
}{
{"", ""},
{"runtime.main", "main"},
{"github.com/pkg/errors.funcname", "funcname"},
{"funcname", "funcname"},
{"io.copyBuffer", "copyBuffer"},
{"main.(*R).Write", "(*R).Write"},
}
for _, tt := range tests {
got := funcname(tt.name)
want := tt.want
if got != want {
t.Errorf("funcname(%q): want: %q, got %q", tt.name, want, got)
}
}
}
func TestTrimGOPATH(t *testing.T) {
var tests = []struct {
Frame
want string
}{{
Frame(initpc),
"github.com/pkg/errors/stack_test.go",
}}
for i, tt := range tests {
pc := tt.Frame.pc()
fn := runtime.FuncForPC(pc)
file, _ := fn.FileLine(pc)
got := trimGOPATH(fn.Name(), file)
testFormatRegexp(t, i, got, "%s", tt.want)
}
}
func TestStackTrace(t *testing.T) {
tests := []struct {
err error
want []string
}{{
New("ooh"), []string{
"github.com/pkg/errors.TestStackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:172",
},
}, {
Wrap(New("ooh"), "ahh"), []string{
"github.com/pkg/errors.TestStackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:177", // this is the stack of Wrap, not New
},
}, {
Cause(Wrap(New("ooh"), "ahh")), []string{
"github.com/pkg/errors.TestStackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:182", // this is the stack of New
},
}, {
func() error { return New("ooh") }(), []string{
`github.com/pkg/errors.(func·009|TestStackTrace.func1)` +
"\n\t.+/github.com/pkg/errors/stack_test.go:187", // this is the stack of New
"github.com/pkg/errors.TestStackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:187", // this is the stack of New's caller
},
}, {
Cause(func() error {
return func() error {
return Errorf("hello %s", fmt.Sprintf("world"))
}()
}()), []string{
`github.com/pkg/errors.(func·010|TestStackTrace.func2.1)` +
"\n\t.+/github.com/pkg/errors/stack_test.go:196", // this is the stack of Errorf
`github.com/pkg/errors.(func·011|TestStackTrace.func2)` +
"\n\t.+/github.com/pkg/errors/stack_test.go:197", // this is the stack of Errorf's caller
"github.com/pkg/errors.TestStackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:198", // this is the stack of Errorf's caller's caller
},
}}
for i, tt := range tests {
x, ok := tt.err.(interface {
StackTrace() StackTrace
})
if !ok {
t.Errorf("expected %#v to implement StackTrace() StackTrace", tt.err)
continue
}
st := x.StackTrace()
for j, want := range tt.want {
testFormatRegexp(t, i, st[j], "%+v", want)
}
}
}
func stackTrace() StackTrace {
const depth = 8
var pcs [depth]uintptr
n := runtime.Callers(1, pcs[:])
var st stack = pcs[0:n]
return st.StackTrace()
}
func TestStackTraceFormat(t *testing.T) {
tests := []struct {
StackTrace
format string
want string
}{{
nil,
"%s",
`\[\]`,
}, {
nil,
"%v",
`\[\]`,
}, {
nil,
"%+v",
"",
}, {
nil,
"%#v",
`\[\]errors.Frame\(nil\)`,
}, {
make(StackTrace, 0),
"%s",
`\[\]`,
}, {
make(StackTrace, 0),
"%v",
`\[\]`,
}, {
make(StackTrace, 0),
"%+v",
"",
}, {
make(StackTrace, 0),
"%#v",
`\[\]errors.Frame{}`,
}, {
stackTrace()[:2],
"%s",
`\[stack_test.go stack_test.go\]`,
}, {
stackTrace()[:2],
"%v",
`\[stack_test.go:225 stack_test.go:272\]`,
}, {
stackTrace()[:2],
"%+v",
"\n" +
"github.com/pkg/errors.stackTrace\n" +
"\t.+/github.com/pkg/errors/stack_test.go:225\n" +
"github.com/pkg/errors.TestStackTraceFormat\n" +
"\t.+/github.com/pkg/errors/stack_test.go:276",
}, {
stackTrace()[:2],
"%#v",
`\[\]errors.Frame{stack_test.go:225, stack_test.go:284}`,
}}
for i, tt := range tests {
testFormatRegexp(t, i, tt.StackTrace, tt.format, tt.want)
}
}