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123 lines
2.9 KiB
123 lines
2.9 KiB
8 years ago
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/*
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* Minio Cloud Storage, (C) 2016 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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"os"
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"path/filepath"
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"runtime"
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"strings"
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)
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// Holds the current directory path. Used for trimming path in traceError()
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var rootPath string
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// Figure out the rootPath
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func initError() {
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// Root path is automatically determined from the calling function's source file location.
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// Catch the calling function's source file path.
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_, file, _, _ := runtime.Caller(1)
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// Save the directory alone.
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rootPath = filepath.Dir(file)
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}
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// Represents a stack frame in the stack trace.
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type traceInfo struct {
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file string // File where error occurred
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line int // Line where error occurred
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name string // Name of the function where error occurred
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}
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// Error - error type containing cause and the stack trace.
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type Error struct {
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e error // Holds the cause error
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trace []traceInfo // stack trace
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errs []error // Useful for XL to hold errors from all disks
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}
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// Implement error interface.
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func (e Error) Error() string {
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return e.e.Error()
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}
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// Trace - returns stack trace.
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func (e Error) Trace() []string {
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var traceArr []string
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for _, info := range e.trace {
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traceArr = append(traceArr, fmt.Sprintf("%s:%d:%s",
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info.file, info.line, info.name))
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}
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return traceArr
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}
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// NewStorageError - return new Error type.
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func traceError(e error, errs ...error) error {
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if e == nil {
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return nil
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}
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err := &Error{}
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err.e = e
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err.errs = errs
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stack := make([]uintptr, 40)
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length := runtime.Callers(2, stack)
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if length > len(stack) {
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length = len(stack)
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}
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stack = stack[:length]
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for _, pc := range stack {
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pc = pc - 1
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fn := runtime.FuncForPC(pc)
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file, line := fn.FileLine(pc)
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name := fn.Name()
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if strings.HasSuffix(name, "ServeHTTP") {
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break
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}
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if strings.HasSuffix(name, "runtime.") {
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break
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}
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file = strings.TrimPrefix(file, rootPath+string(os.PathSeparator))
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name = strings.TrimPrefix(name, "github.com/minio/minio/cmd.")
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err.trace = append(err.trace, traceInfo{file, line, name})
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}
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return err
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}
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// Returns the underlying cause error.
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func errorCause(err error) error {
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if e, ok := err.(*Error); ok {
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err = e.e
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}
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return err
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}
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// Returns slice of underlying cause error.
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func errorsCause(errs []error) []error {
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Errs := make([]error, len(errs))
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for i, err := range errs {
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if err == nil {
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continue
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}
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Errs[i] = errorCause(err)
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}
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return Errs
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}
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