Commit 8f64f6ed authored by Kirill Smelkov's avatar Kirill Smelkov

go/zodb: Start of FileStorage support

Start implementing FileStorage support by adding code to load/decode
FileStorage records and way to iterate a FileStorage.

Tests will come in a later patch together with ZODB-level loading
support.
parent fcab9405
// Copyright (C) 2017 Nexedi SA and Contributors.
// Kirill Smelkov <kirr@nexedi.com>
//
// This program is free software: you can Use, Study, Modify and Redistribute
// it under the terms of the GNU General Public License version 3, or (at your
// option) any later version, as published by the Free Software Foundation.
//
// You can also Link and Combine this program with other software covered by
// the terms of any of the Free Software licenses or any of the Open Source
// Initiative approved licenses and Convey the resulting work. Corresponding
// source of such a combination shall include the source code for all other
// software used.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.
// Package storage provides common infrastructure related to ZODB storages.
package storage
This diff is collapsed.
// Copyright (C) 2017 Nexedi SA and Contributors.
// Kirill Smelkov <kirr@nexedi.com>
//
// This program is free software: you can Use, Study, Modify and Redistribute
// it under the terms of the GNU General Public License version 3, or (at your
// option) any later version, as published by the Free Software Foundation.
//
// You can also Link and Combine this program with other software covered by
// the terms of any of the Free Software licenses or any of the Open Source
// Initiative approved licenses and Convey the resulting work. Corresponding
// source of such a combination shall include the source code for all other
// software used.
//
// This program is distributed WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
//
// See COPYING file for full licensing terms.
// See https://www.nexedi.com/licensing for rationale and options.
package fs1
import (
"io"
"os"
"lab.nexedi.com/kirr/go123/xbufio"
)
// noEOF returns err, but changes io.EOF -> io.ErrUnexpectedEOF
func noEOF(err error) error {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return err
}
// okEOF returns err, but changes io.EOF -> nil
func okEOF(err error) error {
if err == io.EOF {
err = nil
}
return err
}
// record reading routines work on abstract file-like interfaces.
// when they report e.g. decoding error, if reader has name, e.g. as os.File
// does, this name is included into error as prefix.
// named represents something having a name - ex. os.File
type named interface {
Name() string
}
// ioname returns f's name if it has one.
// if not - "" is returned.
func ioname(f interface{}) string {
if fn, ok := f.(named); ok {
return fn.Name()
}
return ""
}
// ioprefix returns "<name>: " for f if it has name.
// if not - "" is returned.
func ioprefix(f interface{}) string {
n := ioname(f)
if n != "" {
return n + ": "
}
return ""
}
// seqReadAt wraps os.File with xbufio.SeqReaderAt for its .ReadAt method.
// in particular f's name is preserved.
func seqReadAt(f *os.File) *seqFileReaderAt {
fseq := xbufio.NewSeqReaderAt(f)
return &seqFileReaderAt{fseq, f}
}
type seqFileReaderAt struct {
*xbufio.SeqReaderAt
// keep os.File still exposed for .Name()
// XXX better xbufio.SeqReaderAt expose underlying reader?
*os.File
}
func (f *seqFileReaderAt) ReadAt(p []byte, off int64) (int, error) {
// route ReadAt to wrapper
return f.SeqReaderAt.ReadAt(p, off)
}
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