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Levin Zimmermann
neoppod
Commits
eb3028a1
Commit
eb3028a1
authored
Mar 01, 2017
by
Kirill Smelkov
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parent
0f5cc13f
Changes
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1 changed file
with
26 additions
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12 deletions
+26
-12
t/neo/storage/fs1/filestorage.go
t/neo/storage/fs1/filestorage.go
+26
-12
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t/neo/storage/fs1/filestorage.go
View file @
eb3028a1
...
...
@@ -18,7 +18,7 @@ package fs1
import
(
"encoding/binary"
"errors"
//
"errors"
"fmt"
"io"
"os"
...
...
@@ -131,7 +131,16 @@ func (dh *DataHeader) err(subj string, err error) *ErrDataRecord {
return
&
ErrDataRecord
{
dh
.
Pos
,
subj
,
err
}
}
// TODO errf, decodeErr
// errf is syntatic shortcut for err and fmt.Errorf
func
(
dh
*
DataHeader
)
errf
(
subj
,
format
string
,
a
...
interface
{})
*
ErrDataRecord
{
return
dh
.
err
(
subj
,
fmt
.
Errorf
(
format
,
a
...
))
}
// TODO decodeErr
func
(
dh
*
DataHeader
)
bug
(
format
string
,
a
...
interface
{})
{
panic
(
dh
.
errf
(
"bug"
,
format
,
a
...
))
}
// // XXX -> zodb?
// var ErrVersionNonZero = errors.New("non-zero version")
...
...
@@ -163,10 +172,10 @@ const (
//
// rules for Len/LenPrev returns:
// Len == 0 transaction header could not be read
// Len == -1 EOF
is there when reading
forward
// Len == -1 EOF forward
// Len >= TxnHeaderFixSize transaction was read normally
//
// LenPrev == 0
error reading
// LenPrev == 0
prev record length could not be read
// LenPrev == -1 EOF backward
// LenPrev >= TxnHeaderFixSize LenPrev was read/checked normally
func
(
txnh
*
TxnHeader
)
Load
(
r
io
.
ReaderAt
/* *os.File */
,
pos
int64
,
flags
TxnLoadFlags
)
error
{
...
...
@@ -317,32 +326,37 @@ func (txnh *TxnHeader) LoadPrev(r io.ReaderAt, flags TxnLoadFlags) error {
// - TODO
func
(
txnh
*
TxnHeader
)
LoadNext
(
r
io
.
ReaderAt
,
flags
TxnLoadFlags
)
error
{
lenCur
:=
txnh
.
Len
posCur
:=
txnh
.
Pos
switch
lenCur
{
case
0
:
tx
hn
.
bug
(
"LoadNext() when .Len == error"
)
tx
nh
.
bug
(
"LoadNext() when .Len == error"
)
case
-
1
:
return
io
.
EOF
}
err
:=
txnh
.
Load
(
r
,
txnh
.
Pos
+
lenCur
,
flags
)
// TODO XXX
if
txnh
.
LenPrev
!=
lenCur
{
}
if
err
!=
nil
{
// before checking loading error for next txn, let's first check redundant length
// NOTE also: err could be EOF
if
txnh
.
LenPrev
!=
0
&&
txnh
.
LenPrev
!=
lenCur
{
err
:=
txnh
.
decodeErr
(
"head/tail lengths mismatch: %v, %v"
,
lenCur
,
txnh
.
LenPrev
)
err
.
Pos
=
posCur
// position of txn for which we discovered problem
return
err
}
return
err
}
// decode reads and decodes data record header
func
(
dh
*
DataHeader
)
load
(
r
io
.
ReaderAt
/* *os.File */
,
pos
int64
,
tmpBuf
*
[
DataHeaderSize
]
byte
)
error
{
dh
.
Pos
=
pos
if
pos
<
dataValidFrom
{
panic
(
&
ErrDataRecord
{
pos
,
"read"
,
bugPositionInvalid
}
)
dh
.
bug
(
"Load() on invalid position"
)
}
dh
.
Pos
=
pos
_
,
err
:=
r
.
ReadAt
(
tmpBuf
[
:
],
pos
)
if
err
!=
nil
{
return
&
ErrDataRecord
{
pos
,
"read"
,
noEOF
(
err
)}
...
...
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