65aaa607ab
Change made by: - running "gvt fetch" on each of the packages mentioned in Godeps/Godeps.json - `rm -rf Godeps` - tweaking the build scripts to not mention Godeps - tweaking the build scripts to test `./lib/...`, `./cmd/...` explicitly (to avoid testing vendor) - tweaking the build scripts to not juggle GOPATH for Godeps and instead set GO15VENDOREXPERIMENT. This also results in some updated packages at the same time I bet. Building with Go 1.3 and 1.4 still *works* but won't use our vendored dependencies - the user needs to have the actual packages in their GOPATH then, which they'll get with a normal "go get". Building with Go 1.6+ will get our vendored dependencies by default even when not using our build script, which is nice. By doing this we gain some freedom in that we can pick and choose manually what to include in vendor, as it's not based on just dependency analysis of our own code. This is also a risk as we might pick up dependencies we are unaware of, as the build may work locally with those packages present in GOPATH. On the other hand the build server will detect this as it has no packages in it's GOPATH beyond what is included in the repo. Recommended tool to manage dependencies is github.com/FiloSottile/gvt.
178 lines
4.3 KiB
Go
178 lines
4.3 KiB
Go
// Copyright (c) 2012, Suryandaru Triandana <syndtr@gmail.com>
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// All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Package storage provides storage abstraction for LevelDB.
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package storage
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import (
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"errors"
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"fmt"
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"io"
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"github.com/syndtr/goleveldb/leveldb/util"
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)
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type FileType int
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const (
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TypeManifest FileType = 1 << iota
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TypeJournal
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TypeTable
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TypeTemp
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TypeAll = TypeManifest | TypeJournal | TypeTable | TypeTemp
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)
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func (t FileType) String() string {
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switch t {
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case TypeManifest:
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return "manifest"
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case TypeJournal:
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return "journal"
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case TypeTable:
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return "table"
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case TypeTemp:
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return "temp"
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}
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return fmt.Sprintf("<unknown:%d>", t)
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}
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var (
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ErrInvalidFile = errors.New("leveldb/storage: invalid file for argument")
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ErrLocked = errors.New("leveldb/storage: already locked")
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ErrClosed = errors.New("leveldb/storage: closed")
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)
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// ErrCorrupted is the type that wraps errors that indicate corruption of
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// a file. Package storage has its own type instead of using
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// errors.ErrCorrupted to prevent circular import.
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type ErrCorrupted struct {
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Fd FileDesc
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Err error
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}
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func (e *ErrCorrupted) Error() string {
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if !e.Fd.Nil() {
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return fmt.Sprintf("%v [file=%v]", e.Err, e.Fd)
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} else {
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return e.Err.Error()
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}
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}
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// Syncer is the interface that wraps basic Sync method.
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type Syncer interface {
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// Sync commits the current contents of the file to stable storage.
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Sync() error
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}
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// Reader is the interface that groups the basic Read, Seek, ReadAt and Close
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// methods.
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type Reader interface {
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io.ReadSeeker
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io.ReaderAt
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io.Closer
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}
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// Writer is the interface that groups the basic Write, Sync and Close
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// methods.
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type Writer interface {
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io.WriteCloser
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Syncer
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}
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type Lock interface {
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util.Releaser
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}
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// FileDesc is a file descriptor.
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type FileDesc struct {
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Type FileType
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Num int64
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}
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func (fd FileDesc) String() string {
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switch fd.Type {
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case TypeManifest:
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return fmt.Sprintf("MANIFEST-%06d", fd.Num)
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case TypeJournal:
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return fmt.Sprintf("%06d.log", fd.Num)
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case TypeTable:
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return fmt.Sprintf("%06d.ldb", fd.Num)
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case TypeTemp:
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return fmt.Sprintf("%06d.tmp", fd.Num)
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default:
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return fmt.Sprintf("%#x-%d", fd.Type, fd.Num)
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}
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}
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// Nil returns true if fd == (FileDesc{}).
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func (fd FileDesc) Nil() bool {
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return fd == (FileDesc{})
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}
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// FileDescOk returns true if fd is a valid file descriptor.
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func FileDescOk(fd FileDesc) bool {
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switch fd.Type {
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case TypeManifest:
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case TypeJournal:
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case TypeTable:
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case TypeTemp:
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default:
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return false
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}
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return fd.Num >= 0
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}
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// Storage is the storage. A storage instance must be goroutine-safe.
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type Storage interface {
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// Lock locks the storage. Any subsequent attempt to call Lock will fail
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// until the last lock released.
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// After use the caller should call the Release method.
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Lock() (Lock, error)
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// Log logs a string. This is used for logging.
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// An implementation may write to a file, stdout or simply do nothing.
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Log(str string)
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// SetMeta sets to point to the given fd, which then can be acquired using
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// GetMeta method.
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// SetMeta should be implemented in such way that changes should happened
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// atomically.
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SetMeta(fd FileDesc) error
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// GetManifest returns a manifest file.
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// Returns os.ErrNotExist if meta doesn't point to any fd, or point to fd
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// that doesn't exist.
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GetMeta() (FileDesc, error)
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// List returns fds that match the given file types.
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// The file types may be OR'ed together.
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List(ft FileType) ([]FileDesc, error)
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// Open opens file with the given fd read-only.
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// Returns os.ErrNotExist error if the file does not exist.
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// Returns ErrClosed if the underlying storage is closed.
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Open(fd FileDesc) (Reader, error)
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// Create creates file with the given fd, truncate if already exist and
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// opens write-only.
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// Returns ErrClosed if the underlying storage is closed.
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Create(fd FileDesc) (Writer, error)
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// Remove removes file with the given fd.
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// Returns ErrClosed if the underlying storage is closed.
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Remove(fd FileDesc) error
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// Rename renames file from oldfd to newfd.
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// Returns ErrClosed if the underlying storage is closed.
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Rename(oldfd, newfd FileDesc) error
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// Close closes the storage.
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// It is valid to call Close multiple times. Other methods should not be
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// called after the storage has been closed.
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Close() error
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}
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