mirror of
https://github.com/ceph/ceph-csi.git
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136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
/*
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* errors.go - Custom errors and error functions used by fscrypt
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*
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* Copyright 2017 Google Inc.
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* Author: Joe Richey (joerichey@google.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package util
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import (
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"fmt"
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"io"
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"log"
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"os"
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"github.com/pkg/errors"
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)
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// ErrReader wraps an io.Reader, passing along calls to Read() until a read
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// fails. Then, the error is stored, and all subsequent calls to Read() do
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// nothing. This allows you to write code which has many subsequent reads and
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// do all of the error checking at the end. For example:
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//
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// r := NewErrReader(reader)
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// r.Read(foo)
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// r.Read(bar)
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// r.Read(baz)
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// if r.Err() != nil {
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// // Handle error
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// }
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//
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// Taken from https://blog.golang.org/errors-are-values by Rob Pike.
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type ErrReader struct {
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r io.Reader
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err error
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}
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// NewErrReader creates an ErrReader which wraps the provided reader.
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func NewErrReader(reader io.Reader) *ErrReader {
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return &ErrReader{r: reader, err: nil}
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}
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// Read runs ReadFull on the wrapped reader if no errors have occurred.
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// Otherwise, the previous error is just returned and no reads are attempted.
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func (e *ErrReader) Read(p []byte) (n int, err error) {
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if e.err == nil {
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n, e.err = io.ReadFull(e.r, p)
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}
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return n, e.err
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}
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// Err returns the first encountered err (or nil if no errors occurred).
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func (e *ErrReader) Err() error {
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return e.err
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}
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// ErrWriter works exactly like ErrReader, except with io.Writer.
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type ErrWriter struct {
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w io.Writer
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err error
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}
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// NewErrWriter creates an ErrWriter which wraps the provided writer.
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func NewErrWriter(writer io.Writer) *ErrWriter {
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return &ErrWriter{w: writer, err: nil}
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}
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// Write runs the wrapped writer's Write if no errors have occurred. Otherwise,
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// the previous error is just returned and no writes are attempted.
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func (e *ErrWriter) Write(p []byte) (n int, err error) {
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if e.err == nil {
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n, e.err = e.w.Write(p)
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}
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return n, e.err
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}
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// Err returns the first encountered err (or nil if no errors occurred).
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func (e *ErrWriter) Err() error {
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return e.err
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}
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// CheckValidLength returns an invalid length error if expected != actual
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func CheckValidLength(expected, actual int) error {
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if expected == actual {
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return nil
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}
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return fmt.Errorf("expected length of %d, got %d", expected, actual)
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}
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// SystemError is an error that should indicate something has gone wrong in the
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// underlying system (syscall failure, bad ioctl, etc...).
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type SystemError string
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func (s SystemError) Error() string {
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return "system error: " + string(s)
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}
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// NeverError panics if a non-nil error is passed in. It should be used to check
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// for logic errors, not to handle recoverable errors.
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func NeverError(err error) {
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if err != nil {
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log.Panicf("NeverError() check failed: %v", err)
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}
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}
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var (
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// testEnvVarName is the name of an environment variable that should be
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// set to an empty mountpoint. This is only used for integration tests.
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// If not set, integration tests are skipped.
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testEnvVarName = "TEST_FILESYSTEM_ROOT"
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// ErrSkipIntegration indicates integration tests shouldn't be run.
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ErrSkipIntegration = errors.New("skipping integration test")
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)
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// TestRoot returns a the root of a filesystem specified by testEnvVarName. This
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// function is only used for integration tests.
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func TestRoot() (string, error) {
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path := os.Getenv(testEnvVarName)
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if path == "" {
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return "", ErrSkipIntegration
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}
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return path, nil
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}
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