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138 lines
4.3 KiB
Go
138 lines
4.3 KiB
Go
package mdbx
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/*
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#include <stdlib.h>
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#include <stdio.h>
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#include "mdbxgo.h"
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*/
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import "C"
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import (
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"os"
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"syscall"
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)
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// OpError is an error returned by the C API. Not all errors returned by
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// lmdb-go have type OpError but typically they do. The Errno field will
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// either have type Errno or syscall.Errno.
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type OpError struct {
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Op string
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Errno error
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}
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// Error implements the error interface.
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func (err *OpError) Error() string {
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return err.Op + ": " + err.Errno.Error()
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}
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// Errno is an error type that represents the (unique) errno values defined by
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// LMDB. Other errno values (such as EINVAL) are represented with type
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// syscall.Errno. On Windows, LMDB return codes are translated into portable
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// syscall.Errno constants (e.g. syscall.EINVAL, syscall.EACCES, etc.).
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//
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// Most often helper functions such as IsNotFound may be used instead of
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// dealing with Errno values directly.
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//
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// lmdb.IsNotFound(err)
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// lmdb.IsErrno(err, lmdb.TxnFull)
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// lmdb.IsErrnoSys(err, syscall.EINVAL)
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// lmdb.IsErrnoFn(err, os.IsPermission)
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type Errno C.int
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// The most common error codes do not need to be handled explicity. Errors can
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// be checked through helper functions IsNotFound, IsMapFull, etc, Otherwise
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// they should be checked using the IsErrno function instead of direct
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// comparison because they will typically be wrapped with an OpError.
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const (
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// Error codes defined by LMDB. See the list of LMDB return codes for more
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// information about each
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//
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// http://symas.com/mdb/doc/group__errors.html
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KeyExist Errno = C.MDBX_KEYEXIST
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NotFound Errno = C.MDBX_NOTFOUND
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PageNotFound Errno = C.MDBX_PAGE_NOTFOUND
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Corrupted Errno = C.MDBX_CORRUPTED
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Panic Errno = C.MDBX_PANIC
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VersionMismatch Errno = C.MDBX_VERSION_MISMATCH
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Invalid Errno = C.MDBX_INVALID
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MapFull Errno = C.MDBX_MAP_FULL
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DBsFull Errno = C.MDBX_DBS_FULL
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ReadersFull Errno = C.MDBX_READERS_FULL
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TxnFull Errno = C.MDBX_TXN_FULL
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CursorFull Errno = C.MDBX_CURSOR_FULL
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PageFull Errno = C.MDBX_PAGE_FULL
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Incompatible Errno = C.MDBX_INCOMPATIBLE
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BadRSlot Errno = C.MDBX_BAD_RSLOT
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BadTxn Errno = C.MDBX_BAD_TXN
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BadValSize Errno = C.MDBX_BAD_VALSIZE
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BadDBI Errno = C.MDBX_BAD_DBI
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Perm Errno = C.MDBX_EPERM
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//TLSFull Errno = C.MDBX_TLS_FULL
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//MapResized Errno = C.MDBX_MAP_RESIZED
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)
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// minimum and maximum values produced for the Errno type. syscall.Errnos of
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// other values may still be produced.
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const minErrno, maxErrno C.int = C.MDBX_KEYEXIST, C.MDBX_LAST_ADDED_ERRCODE
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func (e Errno) Error() string {
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return C.GoString(C.mdbx_strerror(C.int(e)))
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}
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// _operrno is for use by tests that can't import C
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func _operrno(op string, ret int) error {
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return operrno(op, C.int(ret))
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}
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// IsNotFound returns true if the key requested in Txn.Get or Cursor.Get does
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// not exist or if the Cursor reached the end of the database without locating
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// a value (EOF).
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func IsNotFound(err error) bool {
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return IsErrno(err, NotFound)
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}
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func IsKeyExists(err error) bool {
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return IsErrno(err, KeyExist)
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}
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// IsNotExist returns true the path passed to the Env.Open method does not
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// exist.
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func IsNotExist(err error) bool {
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return IsErrnoFn(err, os.IsNotExist)
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}
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// IsMapFull returns true if the environment map size has been reached.
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func IsMapFull(err error) bool {
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return IsErrno(err, MapFull)
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}
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// IsMapResized returns true if the environment has grown too large for the
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// current map after being resized by another process.
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//func IsMapResized(err error) bool {
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// return IsErrno(err, MapResized)
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//}
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// IsErrno returns true if err's errno is the given errno.
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func IsErrno(err error, errno Errno) bool {
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return IsErrnoFn(err, func(err error) bool { return err == errno }) //nolint:goerr113
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}
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// IsErrnoSys returns true if err's errno is the given errno.
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func IsErrnoSys(err error, errno syscall.Errno) bool {
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return IsErrnoFn(err, func(err error) bool { return err == errno }) //nolint:goerr113
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}
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// IsErrnoFn calls fn on the error underlying err and returns the result. If
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// err is an *OpError then err.Errno is passed to fn. Otherwise err is passed
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// directly to fn.
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func IsErrnoFn(err error, fn func(error) bool) bool {
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if err == nil {
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return false
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}
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if err, ok := err.(*OpError); ok {
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return fn(err.Errno)
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}
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return fn(err)
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}
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