Add 'errors/' from commit 'dd131cce3d6f9c0b2351537cec85955ebc0be5e0'

Repo: github.com/lbryio/errors.go

git-subtree-dir: errors
git-subtree-mainline: f233e3b525
git-subtree-split: dd131cce3d

errors/.gitignore

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+/.idea
+/vendor

errors/Gopkg.lock

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+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "github.com/go-errors/errors"
+  packages = ["."]
+  revision = "3afebba5a48dbc89b574d890b6b34d9ee10b4785"
+  version = "v1.0.0"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "cdb8112723180cdbe98df0e74827b04930f26759f6c08fe39066835774c18175"
+  solver-name = "gps-cdcl"
+  solver-version = 1

errors/Gopkg.toml

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+[[constraint]]
+  name = "github.com/go-errors/errors"
+  version = "1.0.0"

errors/README.md

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+# errors
+
+Better error handling. Marries [go-errors/errors](https://github.com/go-errors/errors) to [pkg/errors](https://github.com/pkg/errors), and 
+adds a little bit of our own magic sauce.

errors/errors.go

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+package errors
+
+import (
+	base "errors"
+	"fmt"
+
+	"github.com/go-errors/errors"
+)
+
+// interop with pkg/errors
+type causer interface {
+	Cause() error
+}
+
+// Err intelligently creates/handles errors, while preserving the stack trace.
+// It works with errors from github.com/pkg/errors too.
+func Err(err interface{}, fmtParams ...interface{}) error {
+	if err == nil {
+		return nil
+	}
+
+	if _, ok := err.(causer); ok {
+		err = fmt.Errorf("%+v", err)
+	} else if errString, ok := err.(string); ok && len(fmtParams) > 0 {
+		err = fmt.Errorf(errString, fmtParams...)
+	}
+
+	return errors.Wrap(err, 1)
+}
+
+// Wrap calls errors.Wrap, in case you want to skip a different amount
+func Wrap(err interface{}, skip int) *errors.Error {
+	if err == nil {
+		return nil
+	}
+
+	if _, ok := err.(causer); ok {
+		err = fmt.Errorf("%+v", err)
+	}
+
+	return errors.Wrap(err, skip+1)
+}
+
+// Is compares two wrapped errors to determine if the underlying errors are the same
+// It also interops with errors from pkg/errors
+func Is(e error, original error) bool {
+	if c, ok := e.(causer); ok {
+		e = c.Cause()
+	}
+	if c, ok := original.(causer); ok {
+		original = c.Cause()
+	}
+	return errors.Is(e, original)
+}
+
+// Prefix prefixes the message of the error with the given string
+func Prefix(prefix string, err interface{}) error {
+	if err == nil {
+		return nil
+	}
+	return errors.WrapPrefix(Err(err), prefix, 0)
+}
+
+// Trace returns the stack trace
+func Trace(err error) string {
+	if err == nil {
+		return ""
+	}
+	return string(Err(err).(*errors.Error).Stack())
+}
+
+// FullTrace returns the error type, message, and stack trace
+func FullTrace(err error) string {
+	if err == nil {
+		return ""
+	}
+	return Err(err).(*errors.Error).ErrorStack()
+}
+
+// Base returns a simple error with no stack trace attached
+func Base(text string) error {
+	return base.New(text)
+}
+
+// HasTrace checks if error has a trace attached
+func HasTrace(err error) bool {
+	_, ok := err.(*errors.Error)
+	return ok
+}