errors.go

Documentation: github.com/syndtr/goleveldb/leveldb/errors

     1  // Copyright (c) 2014, Suryandaru Triandana <syndtr@gmail.com>
     2  // All rights reserved.
     3  //
     4  // Use of this source code is governed by a BSD-style license that can be
     5  // found in the LICENSE file.
     6  
     7  // Package errors provides common error types used throughout leveldb.
     8  package errors
     9  
    10  import (
    11  	"errors"
    12  	"fmt"
    13  
    14  	"github.com/syndtr/goleveldb/leveldb/storage"
    15  	"github.com/syndtr/goleveldb/leveldb/util"
    16  )
    17  
    18  // Common errors.
    19  var (
    20  	ErrNotFound    = New("leveldb: not found")
    21  	ErrReleased    = util.ErrReleased
    22  	ErrHasReleaser = util.ErrHasReleaser
    23  )
    24  
    25  // New returns an error that formats as the given text.
    26  func New(text string) error {
    27  	return errors.New(text)
    28  }
    29  
    30  // ErrCorrupted is the type that wraps errors that indicate corruption in
    31  // the database.
    32  type ErrCorrupted struct {
    33  	Fd  storage.FileDesc
    34  	Err error
    35  }
    36  
    37  func (e *ErrCorrupted) Error() string {
    38  	if !e.Fd.Zero() {
    39  		return fmt.Sprintf("%v [file=%v]", e.Err, e.Fd)
    40  	}
    41  	return e.Err.Error()
    42  }
    43  
    44  // NewErrCorrupted creates new ErrCorrupted error.
    45  func NewErrCorrupted(fd storage.FileDesc, err error) error {
    46  	return &ErrCorrupted{fd, err}
    47  }
    48  
    49  // IsCorrupted returns a boolean indicating whether the error is indicating
    50  // a corruption.
    51  func IsCorrupted(err error) bool {
    52  	switch err.(type) {
    53  	case *ErrCorrupted:
    54  		return true
    55  	case *storage.ErrCorrupted:
    56  		return true
    57  	}
    58  	return false
    59  }
    60  
    61  // ErrMissingFiles is the type that indicating a corruption due to missing
    62  // files. ErrMissingFiles always wrapped with ErrCorrupted.
    63  type ErrMissingFiles struct {
    64  	Fds []storage.FileDesc
    65  }
    66  
    67  func (e *ErrMissingFiles) Error() string { return "file missing" }
    68  
    69  // SetFd sets 'file info' of the given error with the given file.
    70  // Currently only ErrCorrupted is supported, otherwise will do nothing.
    71  func SetFd(err error, fd storage.FileDesc) error {
    72  	switch x := err.(type) {
    73  	case *ErrCorrupted:
    74  		x.Fd = fd
    75  		return x
    76  	default:
    77  		return err
    78  	}
    79  }
    80
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