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// Package errors provides common error handling tools
// NOTE: Subject to change, do not rely on this package from outside git-lfs source
package errors
// The LFS error system provides a simple wrapper around Go errors and the
// ability to inspect errors. It is strongly influenced by Dave Cheney's post
// at http://dave.cheney.net/2014/12/24/inspecting-errors.
//
// When passing errors out of lfs package functions, the return type should
// always be `error`. The wrappedError details are not exported. If an error is
// the kind of error a caller should need to investigate, an IsXError()
// function is provided that tells the caller if the error is of that type.
// There should only be a handful of cases where a simple `error` is
// insufficient.
//
// The error behaviors can be nested when created. For example, the not
// implemented error can also be marked as a fatal error:
//
// func LfsFunction() error {
// err := functionCall()
// if err != nil {
// return newFatalError(newNotImplementedError(err))
// }
// return nil
// }
//
// Then in the caller:
//
// err := lfs.LfsFunction()
// if lfs.IsNotImplementedError(err) {
// log.Print("feature not implemented")
// }
// if lfs.IsFatalError(err) {
// os.Exit(1)
// }
//
// Wrapped errors contain a context, which is a map[string]string. These
// contexts can be accessed through the Error*Context functions. Calling these
// functions on a regular Go error will have no effect.
//
// Example:
//
// err := lfs.SomeFunction()
// errors.ErrorSetContext(err, "foo", "bar")
// errors.ErrorGetContext(err, "foo") // => "bar"
// errors.ErrorDelContext(err, "foo")
//
// Wrapped errors also contain the stack from the point at which they are
// called. Use the '%+v' printf verb to display. See the github.com/pkg/errors
// docs for more info: https://godoc.org/github.com/pkg/errors
import (
"bytes"
"fmt"
"github.com/pkg/errors"
)
// New returns an error with the supplied message. New also records the stack
// trace at thepoint it was called.
func New(message string) error {
return errors.New(message)
}
// 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 errors.Errorf(format, args...)
}
// Wrap wraps an error with an additional message.
func Wrap(err error, msg string) error {
return newWrappedError(err, msg)
}
// Wrapf wraps an error with an additional formatted message.
func Wrapf(err error, format string, args ...interface{}) error {
if err == nil {
err = errors.New("")
}
message := fmt.Sprintf(format, args...)
return newWrappedError(err, message)
}
func StackTrace(err error) []string {
type stacktrace interface {
StackTrace() errors.StackTrace
}
if err, ok := err.(stacktrace); ok {
frames := err.StackTrace()
lines := make([]string, len(frames))
for i, f := range frames {
lines[i] = fmt.Sprintf("%+v", f)
}
return lines
}
return nil
}
func Combine(errs []error) error {
if len(errs) == 0 {
return nil
}
var buf bytes.Buffer
for i, err := range errs {
if i > 0 {
buf.WriteString("\n")
}
buf.WriteString(err.Error())
}
return fmt.Errorf(buf.String())
}
func Cause(err error) error {
type causer interface {
Cause() error
}
if cause, ok := err.(causer); ok {
return Cause(cause.Cause())
}
return err
}
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