restic/vendor/github.com/pkg/errors
Alexander Neumann bff635bc5f Update dependencies, enable pruning for vendor/
So, `dep` got an nice new feature to remove tests and non-go files from
`vendor/`, and this brings the size of the vendor directory from ~300MiB
down to ~20MiB. We don that now.
2018-08-01 21:32:15 +02:00
..
.gitignore Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
.travis.yml Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
appveyor.yml Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
errors.go Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
LICENSE Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
README.md Vendor dependencies with dep 2017-07-23 14:25:38 +02:00
stack.go Vendor dependencies with dep 2017-07-23 14:25:38 +02:00

errors Travis-CI AppVeyor GoDoc Report card

Package errors provides simple error handling primitives.

go get github.com/pkg/errors

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. For example

_, 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.

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:

switch err := errors.Cause(err).(type) {
case *MyError:
        // handle specifically
default:
        // unknown error
}

Read the package documentation for more information.

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