зеркало из https://github.com/mozilla/libaudit-go.git
Merge pull request #30 from ameihm0912/errors
Use errors package from stdlib
This commit is contained in:
Aaron Meihm
GitHub
Коммит
fa62b711f5
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|
@ -5,11 +5,10 @@
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package libaudit
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import (
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"errors"
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"fmt"
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"strconv"
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"syscall"
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"github.com/pkg/errors"
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)
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// EventCallback is the function definition for any function that wants to receive an AuditEvent as soon as
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|
|
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@ -17,7 +17,6 @@ import (
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"github.com/lunixbochs/struc"
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"github.com/mozilla/libaudit-go/headers"
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"github.com/pkg/errors"
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)
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// fieldType denotes the integer values of various fields occuring in audit messages
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@ -1196,7 +1195,7 @@ func printIP6OptName(fieldValue string) (string, error) {
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func printTCPOptName(fieldValue string) (string, error) {
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ival, err := strconv.ParseInt(fieldValue, 16, 64)
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if err != nil {
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return "", errors.Wrap(err, "tcp opt parsing failed")
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return "", err
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}
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if _, ok := headers.TcpOptLookup[int(ival)]; !ok {
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return fmt.Sprintf("unknown tcpopt name (0x%s)", fieldValue), nil
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@ -1268,7 +1267,7 @@ func printSHMFlags(fieldValue string) (string, error) {
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partial = ival & 000777
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tmode, err := printModeShortInt(partial)
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if err != nil {
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return "", errors.Wrap(err, "shm parsing failed")
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return "", err
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}
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if len(name) > 0 {
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name += "|"
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|
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4
rules.go
4
rules.go
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@ -8,6 +8,7 @@ import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"errors"
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"fmt"
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"os"
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"os/user"
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@ -19,7 +20,6 @@ import (
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"github.com/lunixbochs/struc"
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"github.com/mozilla/libaudit-go/headers"
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"github.com/pkg/errors"
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)
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// AuditRules describes a set of audit rules in JSON format
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@ -373,7 +373,7 @@ func auditRuleFieldPairData(rule *auditRuleData, fpd *fieldPairData) error {
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} else {
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user, err := user.Lookup(val)
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if err != nil {
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return errors.Wrapf(err, "unknown user %v", user)
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return fmt.Errorf("bad user: %v: %v", user, err)
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}
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userID, err := strconv.Atoi(user.Uid)
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if err != nil {
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|
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@ -1,24 +0,0 @@
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# Compiled Object files, Static and Dynamic libs (Shared Objects)
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*.o
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*.a
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*.so
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# Folders
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_obj
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_test
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# Architecture specific extensions/prefixes
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*.[568vq]
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[568vq].out
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*.cgo1.go
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*.cgo2.c
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_cgo_defun.c
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_cgo_gotypes.go
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_cgo_export.*
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_testmain.go
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*.exe
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*.test
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*.prof
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@ -1,10 +0,0 @@
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language: go
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go_import_path: github.com/pkg/errors
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go:
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- 1.4.3
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- 1.5.4
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- 1.6.2
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- tip
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script:
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- go test -v ./...
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@ -1,24 +0,0 @@
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Copyright (c) 2015, Dave Cheney <dave@cheney.net>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
|
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modification, are permitted provided that the following conditions are met:
|
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|
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* Redistributions of source code must retain the above copyright notice, this
|
||||
list of conditions and the following disclaimer.
|
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|
||||
* 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.
|
||||
|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
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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
|
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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|
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@ -1,59 +0,0 @@
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# errors [](https://travis-ci.org/pkg/errors) [](http://godoc.org/github.com/pkg/errors) [](https://goreportcard.com/report/github.com/pkg/errors)
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Package errors provides simple error handling primitives.
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The traditional error handling idiom in Go is roughly akin to
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```go
|
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if err != nil {
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return err
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}
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```
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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.
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|
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## Adding context to an error
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The errors.Wrap function returns a new error that adds context to the original error. For example
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```go
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_, err := ioutil.ReadAll(r)
|
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if err != nil {
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return errors.Wrap(err, "read failed")
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}
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```
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## Retrieving the stack trace of an error or wrapper
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`New`, `Errorf`, `Wrap`, and `Wrapf` record a stack trace at the point they are invoked.
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This information can be retrieved with the following interface.
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```go
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type Stack interface {
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Stack() []uintptr
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}
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```
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## Retrieving the cause of an error
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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 recurse 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`.
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```go
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type causer interface {
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Cause() error
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}
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```
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`errors.Cause` will recursively retrieve the topmost error which does not implement `causer`, which is assumed to be the original cause. For example:
|
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```go
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switch err := errors.Cause(err).(type) {
|
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case *MyError:
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// handle specifically
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default:
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// unknown error
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}
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```
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Would you like to know more? Read the [blog post](http://dave.cheney.net/2016/04/27/dont-just-check-errors-handle-them-gracefully).
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## Contributing
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|
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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.
|
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|
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Before proposing a change, please discuss your change by raising an issue.
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## Licence
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MIT
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|
|
@ -1,259 +0,0 @@
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// Package errors provides simple error handling primitives.
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//
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// The traditional error handling idiom in Go is roughly akin to
|
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//
|
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// if err != nil {
|
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// return err
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// }
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//
|
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// which applied recursively up the call stack results in error reports
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// without context or debugging information. The errors package allows
|
||||
// programmers to add context to the failure path in their code in a way
|
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// that does not destroy the original value of the error.
|
||||
//
|
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// Adding context to an error
|
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//
|
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// The errors.Wrap function returns a new error that adds context to the
|
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// original error. For example
|
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//
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// _, err := ioutil.ReadAll(r)
|
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// if err != nil {
|
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// return errors.Wrap(err, "read failed")
|
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// }
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//
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// Retrieving the stack trace of an error or wrapper
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//
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// New, Errorf, Wrap, and Wrapf record a stack trace at the point they are
|
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// invoked. This information can be retrieved with the following interface.
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//
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// type Stack interface {
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// Stack() []uintptr
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// }
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//
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// Retrieving the cause of an error
|
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//
|
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// Using errors.Wrap constructs a stack of errors, adding context to the
|
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// preceding error. Depending on the nature of the error it may be necessary
|
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// to reverse the operation of errors.Wrap to retrieve the original error
|
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// for inspection. Any error value which implements this interface
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//
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// type Causer interface {
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// Cause() error
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// }
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//
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// can be inspected by errors.Cause. errors.Cause will recursively retrieve
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// the topmost error which does not implement causer, which is assumed to be
|
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// the original cause. For example:
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//
|
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// switch err := errors.Cause(err).(type) {
|
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// case *MyError:
|
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// // handle specifically
|
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// default:
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// // unknown error
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// }
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package errors
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import (
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"errors"
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"fmt"
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"io"
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"runtime"
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"strings"
|
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)
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|
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// stack represents a stack of programm counters.
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type stack []uintptr
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func (s *stack) Stack() []uintptr { return *s }
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|
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func (s *stack) Location() (string, int) {
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return location((*s)[0] - 1)
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}
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|
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// New returns an error that formats as the given text.
|
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func New(text string) error {
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return struct {
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error
|
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*stack
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}{
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errors.New(text),
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callers(),
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}
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}
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type cause struct {
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cause error
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message string
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}
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|
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func (c cause) Error() string { return c.Message() + ": " + c.Cause().Error() }
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func (c cause) Cause() error { return c.cause }
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func (c cause) Message() string { return c.message }
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|
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// Errorf formats according to a format specifier and returns the string
|
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// as a value that satisfies error.
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func Errorf(format string, args ...interface{}) error {
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return struct {
|
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error
|
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*stack
|
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}{
|
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fmt.Errorf(format, args...),
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callers(),
|
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}
|
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}
|
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|
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// Wrap returns an error annotating err with message.
|
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// If err is nil, Wrap returns nil.
|
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func Wrap(err error, message string) error {
|
||||
if err == nil {
|
||||
return nil
|
||||
}
|
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return struct {
|
||||
cause
|
||||
*stack
|
||||
}{
|
||||
cause{
|
||||
cause: err,
|
||||
message: message,
|
||||
},
|
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callers(),
|
||||
}
|
||||
}
|
||||
|
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// Wrapf returns an error annotating err with the format specifier.
|
||||
// If err is nil, Wrapf returns nil.
|
||||
func Wrapf(err error, format string, args ...interface{}) error {
|
||||
if err == nil {
|
||||
return nil
|
||||
}
|
||||
return struct {
|
||||
cause
|
||||
*stack
|
||||
}{
|
||||
cause{
|
||||
cause: err,
|
||||
message: fmt.Sprintf(format, args...),
|
||||
},
|
||||
callers(),
|
||||
}
|
||||
}
|
||||
|
||||
type causer interface {
|
||||
Cause() 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 {
|
||||
for err != nil {
|
||||
cause, ok := err.(causer)
|
||||
if !ok {
|
||||
break
|
||||
}
|
||||
err = cause.Cause()
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
// Fprint prints the error to the supplied writer.
|
||||
// If the error implements the Causer interface described in Cause
|
||||
// Print will recurse into the error's cause.
|
||||
// If the error implements the inteface:
|
||||
//
|
||||
// type Location interface {
|
||||
// Location() (file string, line int)
|
||||
// }
|
||||
//
|
||||
// Print will also print the file and line of the error.
|
||||
// If err is nil, nothing is printed.
|
||||
func Fprint(w io.Writer, err error) {
|
||||
type location interface {
|
||||
Location() (string, int)
|
||||
}
|
||||
type message interface {
|
||||
Message() string
|
||||
}
|
||||
|
||||
for err != nil {
|
||||
if err, ok := err.(location); ok {
|
||||
file, line := err.Location()
|
||||
fmt.Fprintf(w, "%s:%d: ", file, line)
|
||||
}
|
||||
switch err := err.(type) {
|
||||
case message:
|
||||
fmt.Fprintln(w, err.Message())
|
||||
default:
|
||||
fmt.Fprintln(w, err.Error())
|
||||
}
|
||||
|
||||
cause, ok := err.(causer)
|
||||
if !ok {
|
||||
break
|
||||
}
|
||||
err = cause.Cause()
|
||||
}
|
||||
}
|
||||
|
||||
func callers() *stack {
|
||||
const depth = 32
|
||||
var pcs [depth]uintptr
|
||||
n := runtime.Callers(3, pcs[:])
|
||||
var st stack = pcs[0:n]
|
||||
return &st
|
||||
}
|
||||
|
||||
// location returns the source file and line matching pc.
|
||||
func location(pc uintptr) (string, int) {
|
||||
fn := runtime.FuncForPC(pc)
|
||||
if fn == nil {
|
||||
return "unknown", 0
|
||||
}
|
||||
|
||||
// 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(fn.Name(), sep) + 2
|
||||
file, line := fn.FileLine(pc)
|
||||
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, line
|
||||
}
|
||||
|
|
@ -1,264 +0,0 @@
|
|||
package errors
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"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" }
|
||||
|
||||
type causeError struct {
|
||||
cause error
|
||||
}
|
||||
|
||||
func (e *causeError) Error() string { return "cause error" }
|
||||
func (e *causeError) Cause() error { return e.cause }
|
||||
|
||||
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: &causeError{cause: io.EOF},
|
||||
want: io.EOF,
|
||||
}, {
|
||||
err: x, // return from errors.New
|
||||
want: x,
|
||||
}}
|
||||
|
||||
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 TestFprint(t *testing.T) {
|
||||
x := New("error")
|
||||
tests := []struct {
|
||||
err error
|
||||
want string
|
||||
}{{
|
||||
// nil error is nil
|
||||
err: nil,
|
||||
}, {
|
||||
// explicit nil error is nil
|
||||
err: (error)(nil),
|
||||
}, {
|
||||
// uncaused error is unaffected
|
||||
err: io.EOF,
|
||||
want: "EOF\n",
|
||||
}, {
|
||||
// caused error returns cause
|
||||
err: &causeError{cause: io.EOF},
|
||||
want: "cause error\nEOF\n",
|
||||
}, {
|
||||
err: x, // return from errors.New
|
||||
want: "github.com/pkg/errors/errors_test.go:106: error\n",
|
||||
}, {
|
||||
err: Wrap(x, "message"),
|
||||
want: "github.com/pkg/errors/errors_test.go:128: message\ngithub.com/pkg/errors/errors_test.go:106: error\n",
|
||||
}, {
|
||||
err: Wrap(Wrap(x, "message"), "another message"),
|
||||
want: "github.com/pkg/errors/errors_test.go:131: another message\ngithub.com/pkg/errors/errors_test.go:131: message\ngithub.com/pkg/errors/errors_test.go:106: error\n",
|
||||
}, {
|
||||
err: Wrapf(x, "message"),
|
||||
want: "github.com/pkg/errors/errors_test.go:134: message\ngithub.com/pkg/errors/errors_test.go:106: error\n",
|
||||
}}
|
||||
|
||||
for i, tt := range tests {
|
||||
var w bytes.Buffer
|
||||
Fprint(&w, tt.err)
|
||||
got := w.String()
|
||||
if got != tt.want {
|
||||
t.Errorf("test %d: Fprint(w, %q): got %q, want %q", i+1, tt.err, 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 TestStack(t *testing.T) {
|
||||
type fileline struct {
|
||||
file string
|
||||
line int
|
||||
}
|
||||
tests := []struct {
|
||||
err error
|
||||
want []fileline
|
||||
}{{
|
||||
New("ooh"), []fileline{
|
||||
{"github.com/pkg/errors/errors_test.go", 200},
|
||||
},
|
||||
}, {
|
||||
Wrap(New("ooh"), "ahh"), []fileline{
|
||||
{"github.com/pkg/errors/errors_test.go", 204}, // this is the stack of Wrap, not New
|
||||
},
|
||||
}, {
|
||||
Cause(Wrap(New("ooh"), "ahh")), []fileline{
|
||||
{"github.com/pkg/errors/errors_test.go", 208}, // this is the stack of New
|
||||
},
|
||||
}, {
|
||||
func() error { return New("ooh") }(), []fileline{
|
||||
{"github.com/pkg/errors/errors_test.go", 212}, // this is the stack of New
|
||||
{"github.com/pkg/errors/errors_test.go", 212}, // this is the stack of New's caller
|
||||
},
|
||||
}, {
|
||||
Cause(func() error {
|
||||
return func() error {
|
||||
return Errorf("hello %s", fmt.Sprintf("world"))
|
||||
}()
|
||||
}()), []fileline{
|
||||
{"github.com/pkg/errors/errors_test.go", 219}, // this is the stack of Errorf
|
||||
{"github.com/pkg/errors/errors_test.go", 220}, // this is the stack of Errorf's caller
|
||||
{"github.com/pkg/errors/errors_test.go", 221}, // this is the stack of Errorf's caller's caller
|
||||
},
|
||||
}}
|
||||
for _, tt := range tests {
|
||||
x, ok := tt.err.(interface {
|
||||
Stack() []uintptr
|
||||
})
|
||||
if !ok {
|
||||
t.Errorf("expected %#v to implement Stack()", tt.err)
|
||||
continue
|
||||
}
|
||||
st := x.Stack()
|
||||
for i, want := range tt.want {
|
||||
file, line := location(st[i] - 1)
|
||||
if file != want.file || line != want.line {
|
||||
t.Errorf("frame %d: expected %s:%d, got %s:%d", i, want.file, want.line, file, line)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 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) {
|
||||
tests := []struct {
|
||||
err1, err2 error
|
||||
}{
|
||||
{io.EOF, io.EOF},
|
||||
{io.EOF, nil},
|
||||
{io.EOF, errors.New("EOF")},
|
||||
{io.EOF, New("EOF")},
|
||||
{New("EOF"), New("EOF")},
|
||||
{New("EOF"), Errorf("EOF")},
|
||||
{New("EOF"), Wrap(io.EOF, "EOF")},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
_ = tt.err1 == tt.err2 // mustn't panic
|
||||
}
|
||||
}
|
||||
|
|
@ -1,71 +0,0 @@
|
|||
package errors_test
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"os"
|
||||
|
||||
"github.com/pkg/errors"
|
||||
)
|
||||
|
||||
func ExampleNew() {
|
||||
err := errors.New("whoops")
|
||||
fmt.Println(err)
|
||||
|
||||
// Output: whoops
|
||||
}
|
||||
|
||||
func ExampleNew_fprint() {
|
||||
err := errors.New("whoops")
|
||||
errors.Fprint(os.Stdout, err)
|
||||
|
||||
// Output: github.com/pkg/errors/example_test.go:18: whoops
|
||||
}
|
||||
|
||||
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 ExampleFprint() {
|
||||
err := fn()
|
||||
errors.Fprint(os.Stdout, err)
|
||||
|
||||
// Output: github.com/pkg/errors/example_test.go:36: outer
|
||||
// github.com/pkg/errors/example_test.go:35: middle
|
||||
// github.com/pkg/errors/example_test.go:34: inner
|
||||
// github.com/pkg/errors/example_test.go:33: error
|
||||
}
|
||||
|
||||
func ExampleWrapf() {
|
||||
cause := errors.New("whoops")
|
||||
err := errors.Wrapf(cause, "oh noes #%d", 2)
|
||||
fmt.Println(err)
|
||||
|
||||
// Output: oh noes #2: whoops
|
||||
}
|
||||
|
||||
func ExampleErrorf() {
|
||||
err := errors.Errorf("whoops: %s", "foo")
|
||||
errors.Fprint(os.Stdout, err)
|
||||
|
||||
// Output: github.com/pkg/errors/example_test.go:67: whoops: foo
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче