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135 lines
3.2 KiB
135 lines
3.2 KiB
/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"fmt"
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"io"
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"net"
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"os"
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)
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// uiErr is a structure which contains all information
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// to print a fatal error message in json or pretty mode
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// uiErr implements error so we can use it anywhere
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type uiErr struct {
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msg string
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detail string
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action string
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help string
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}
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// Return the error message
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func (u uiErr) Error() string {
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if u.detail == "" {
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return u.msg
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}
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return u.detail
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}
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// Replace the current error's message
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func (u uiErr) Msg(m string, args ...interface{}) uiErr {
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return uiErr{
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msg: fmt.Sprintf(m, args...),
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detail: u.detail,
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action: u.action,
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help: u.help,
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}
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}
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type uiErrFn func(err error) uiErr
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// Create a UI error generator, this is needed to simplify
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// the update of the detailed error message in several places
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// in Minio code
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func newUIErrFn(msg, action, help string) uiErrFn {
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return func(err error) uiErr {
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u := uiErr{
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msg: msg,
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action: action,
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help: help,
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}
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if err != nil {
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u.detail = err.Error()
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}
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return u
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}
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}
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// errorToUIError inspects the passed error and transforms it
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// to the appropriate UI error.
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func errorToUIErr(err error) uiErr {
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// If this is already a uiErr, do nothing
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if e, ok := err.(uiErr); ok {
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return e
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}
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// Show a generic message for known golang errors
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switch e := err.(type) {
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case *net.OpError:
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if e.Op == "listen" {
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return uiErrPortAlreadyInUse(e).Msg("Port " + e.Addr.String() + " is already in use")
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}
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case *os.PathError:
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if os.IsPermission(e) {
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return uiErrNoPermissionsToAccessDirFiles(e).Msg("Insufficient permissions to access path, `" + e.Path + "`")
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}
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}
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switch err {
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case io.ErrUnexpectedEOF:
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return uiErrUnexpectedDataContent(err)
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default:
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// Failed to identify what type of error this, return a simple UI error
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return uiErr{msg: err.Error()}
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}
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}
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// fmtError() converts a fatal error message to a more clear error
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// using some colors
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func fmtError(introMsg string, err error, jsonFlag bool) string {
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renderedTxt := ""
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uiErr := errorToUIErr(err)
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// JSON print
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if jsonFlag {
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// Message text in json should be simple
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if uiErr.detail != "" {
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return uiErr.msg + ": " + uiErr.detail
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}
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return uiErr.msg
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}
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// Pretty print error message
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introMsg += ": "
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if uiErr.msg != "" {
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introMsg += colorBold(uiErr.msg + ".")
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} else {
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introMsg += colorBold(err.Error() + ".")
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}
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renderedTxt += colorRed(introMsg) + "\n"
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// Add action message
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if uiErr.action != "" {
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renderedTxt += "> " + colorBgYellow(colorBlack(uiErr.action+".")) + "\n"
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}
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// Add help
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if uiErr.help != "" {
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renderedTxt += colorBold("HELP:") + "\n"
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renderedTxt += " " + uiErr.help
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}
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return renderedTxt
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}
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