mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-25 05:06:38 +00:00
461 lines
14 KiB
Go
461 lines
14 KiB
Go
package vfs
|
|
|
|
import (
|
|
"context"
|
|
"crypto/rand"
|
|
"io"
|
|
"reflect"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/tetratelabs/wazero"
|
|
"github.com/tetratelabs/wazero/api"
|
|
|
|
"github.com/ncruces/go-sqlite3/internal/util"
|
|
"github.com/ncruces/go-sqlite3/util/sql3util"
|
|
"github.com/ncruces/julianday"
|
|
)
|
|
|
|
// ExportHostFunctions is an internal API users need not call directly.
|
|
//
|
|
// ExportHostFunctions registers the required VFS host functions
|
|
// with the provided env module.
|
|
func ExportHostFunctions(env wazero.HostModuleBuilder) wazero.HostModuleBuilder {
|
|
util.ExportFuncII(env, "go_vfs_find", vfsFind)
|
|
util.ExportFuncIIJ(env, "go_localtime", vfsLocaltime)
|
|
util.ExportFuncIIII(env, "go_randomness", vfsRandomness)
|
|
util.ExportFuncIII(env, "go_sleep", vfsSleep)
|
|
util.ExportFuncIII(env, "go_current_time_64", vfsCurrentTime64)
|
|
util.ExportFuncIIIII(env, "go_full_pathname", vfsFullPathname)
|
|
util.ExportFuncIIII(env, "go_delete", vfsDelete)
|
|
util.ExportFuncIIIII(env, "go_access", vfsAccess)
|
|
util.ExportFuncIIIIIII(env, "go_open", vfsOpen)
|
|
util.ExportFuncII(env, "go_close", vfsClose)
|
|
util.ExportFuncIIIIJ(env, "go_read", vfsRead)
|
|
util.ExportFuncIIIIJ(env, "go_write", vfsWrite)
|
|
util.ExportFuncIIJ(env, "go_truncate", vfsTruncate)
|
|
util.ExportFuncIII(env, "go_sync", vfsSync)
|
|
util.ExportFuncIII(env, "go_file_size", vfsFileSize)
|
|
util.ExportFuncIIII(env, "go_file_control", vfsFileControl)
|
|
util.ExportFuncII(env, "go_sector_size", vfsSectorSize)
|
|
util.ExportFuncII(env, "go_device_characteristics", vfsDeviceCharacteristics)
|
|
util.ExportFuncIII(env, "go_lock", vfsLock)
|
|
util.ExportFuncIII(env, "go_unlock", vfsUnlock)
|
|
util.ExportFuncIII(env, "go_check_reserved_lock", vfsCheckReservedLock)
|
|
util.ExportFuncIIIIII(env, "go_shm_map", vfsShmMap)
|
|
util.ExportFuncIIIII(env, "go_shm_lock", vfsShmLock)
|
|
util.ExportFuncIII(env, "go_shm_unmap", vfsShmUnmap)
|
|
util.ExportFuncVI(env, "go_shm_barrier", vfsShmBarrier)
|
|
return env
|
|
}
|
|
|
|
func vfsFind(ctx context.Context, mod api.Module, zVfsName uint32) uint32 {
|
|
name := util.ReadString(mod, zVfsName, _MAX_NAME)
|
|
if vfs := Find(name); vfs != nil && vfs != (vfsOS{}) {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func vfsLocaltime(ctx context.Context, mod api.Module, pTm uint32, t int64) _ErrorCode {
|
|
tm := time.Unix(t, 0)
|
|
var isdst int
|
|
if tm.IsDST() {
|
|
isdst = 1
|
|
}
|
|
|
|
const size = 32 / 8
|
|
// https://pubs.opengroup.org/onlinepubs/7908799/xsh/time.h.html
|
|
util.WriteUint32(mod, pTm+0*size, uint32(tm.Second()))
|
|
util.WriteUint32(mod, pTm+1*size, uint32(tm.Minute()))
|
|
util.WriteUint32(mod, pTm+2*size, uint32(tm.Hour()))
|
|
util.WriteUint32(mod, pTm+3*size, uint32(tm.Day()))
|
|
util.WriteUint32(mod, pTm+4*size, uint32(tm.Month()-time.January))
|
|
util.WriteUint32(mod, pTm+5*size, uint32(tm.Year()-1900))
|
|
util.WriteUint32(mod, pTm+6*size, uint32(tm.Weekday()-time.Sunday))
|
|
util.WriteUint32(mod, pTm+7*size, uint32(tm.YearDay()-1))
|
|
util.WriteUint32(mod, pTm+8*size, uint32(isdst))
|
|
return _OK
|
|
}
|
|
|
|
func vfsRandomness(ctx context.Context, mod api.Module, pVfs uint32, nByte int32, zByte uint32) uint32 {
|
|
mem := util.View(mod, zByte, uint64(nByte))
|
|
n, _ := rand.Reader.Read(mem)
|
|
return uint32(n)
|
|
}
|
|
|
|
func vfsSleep(ctx context.Context, mod api.Module, pVfs uint32, nMicro int32) _ErrorCode {
|
|
time.Sleep(time.Duration(nMicro) * time.Microsecond)
|
|
return _OK
|
|
}
|
|
|
|
func vfsCurrentTime64(ctx context.Context, mod api.Module, pVfs, piNow uint32) _ErrorCode {
|
|
day, nsec := julianday.Date(time.Now())
|
|
msec := day*86_400_000 + nsec/1_000_000
|
|
util.WriteUint64(mod, piNow, uint64(msec))
|
|
return _OK
|
|
}
|
|
|
|
func vfsFullPathname(ctx context.Context, mod api.Module, pVfs, zRelative uint32, nFull int32, zFull uint32) _ErrorCode {
|
|
vfs := vfsGet(mod, pVfs)
|
|
path := util.ReadString(mod, zRelative, _MAX_PATHNAME)
|
|
|
|
path, err := vfs.FullPathname(path)
|
|
|
|
if len(path) >= int(nFull) {
|
|
return _CANTOPEN_FULLPATH
|
|
}
|
|
util.WriteString(mod, zFull, path)
|
|
|
|
return vfsErrorCode(err, _CANTOPEN_FULLPATH)
|
|
}
|
|
|
|
func vfsDelete(ctx context.Context, mod api.Module, pVfs, zPath, syncDir uint32) _ErrorCode {
|
|
vfs := vfsGet(mod, pVfs)
|
|
path := util.ReadString(mod, zPath, _MAX_PATHNAME)
|
|
|
|
err := vfs.Delete(path, syncDir != 0)
|
|
return vfsErrorCode(err, _IOERR_DELETE)
|
|
}
|
|
|
|
func vfsAccess(ctx context.Context, mod api.Module, pVfs, zPath uint32, flags AccessFlag, pResOut uint32) _ErrorCode {
|
|
vfs := vfsGet(mod, pVfs)
|
|
path := util.ReadString(mod, zPath, _MAX_PATHNAME)
|
|
|
|
ok, err := vfs.Access(path, flags)
|
|
var res uint32
|
|
if ok {
|
|
res = 1
|
|
}
|
|
|
|
util.WriteUint32(mod, pResOut, res)
|
|
return vfsErrorCode(err, _IOERR_ACCESS)
|
|
}
|
|
|
|
func vfsOpen(ctx context.Context, mod api.Module, pVfs, zPath, pFile uint32, flags OpenFlag, pOutFlags, pOutVFS uint32) _ErrorCode {
|
|
vfs := vfsGet(mod, pVfs)
|
|
name := GetFilename(ctx, mod, zPath, flags)
|
|
|
|
var file File
|
|
var err error
|
|
if ffs, ok := vfs.(VFSFilename); ok {
|
|
file, flags, err = ffs.OpenFilename(name, flags)
|
|
} else {
|
|
file, flags, err = vfs.Open(name.String(), flags)
|
|
}
|
|
if err != nil {
|
|
return vfsErrorCode(err, _CANTOPEN)
|
|
}
|
|
|
|
if file, ok := file.(FilePowersafeOverwrite); ok {
|
|
if b, ok := sql3util.ParseBool(name.URIParameter("psow")); ok {
|
|
file.SetPowersafeOverwrite(b)
|
|
}
|
|
}
|
|
if file, ok := file.(FileSharedMemory); ok &&
|
|
pOutVFS != 0 && file.SharedMemory() != nil {
|
|
util.WriteUint32(mod, pOutVFS, 1)
|
|
}
|
|
if pOutFlags != 0 {
|
|
util.WriteUint32(mod, pOutFlags, uint32(flags))
|
|
}
|
|
file = cksmWrapFile(name, flags, file)
|
|
vfsFileRegister(ctx, mod, pFile, file)
|
|
return _OK
|
|
}
|
|
|
|
func vfsClose(ctx context.Context, mod api.Module, pFile uint32) _ErrorCode {
|
|
err := vfsFileClose(ctx, mod, pFile)
|
|
return vfsErrorCode(err, _IOERR_CLOSE)
|
|
}
|
|
|
|
func vfsRead(ctx context.Context, mod api.Module, pFile, zBuf uint32, iAmt int32, iOfst int64) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
buf := util.View(mod, zBuf, uint64(iAmt))
|
|
|
|
n, err := file.ReadAt(buf, iOfst)
|
|
if n == int(iAmt) {
|
|
return _OK
|
|
}
|
|
if err != io.EOF {
|
|
return vfsErrorCode(err, _IOERR_READ)
|
|
}
|
|
clear(buf[n:])
|
|
return _IOERR_SHORT_READ
|
|
}
|
|
|
|
func vfsWrite(ctx context.Context, mod api.Module, pFile, zBuf uint32, iAmt int32, iOfst int64) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
buf := util.View(mod, zBuf, uint64(iAmt))
|
|
|
|
_, err := file.WriteAt(buf, iOfst)
|
|
return vfsErrorCode(err, _IOERR_WRITE)
|
|
}
|
|
|
|
func vfsTruncate(ctx context.Context, mod api.Module, pFile uint32, nByte int64) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
err := file.Truncate(nByte)
|
|
return vfsErrorCode(err, _IOERR_TRUNCATE)
|
|
}
|
|
|
|
func vfsSync(ctx context.Context, mod api.Module, pFile uint32, flags SyncFlag) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
err := file.Sync(flags)
|
|
return vfsErrorCode(err, _IOERR_FSYNC)
|
|
}
|
|
|
|
func vfsFileSize(ctx context.Context, mod api.Module, pFile, pSize uint32) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
size, err := file.Size()
|
|
util.WriteUint64(mod, pSize, uint64(size))
|
|
return vfsErrorCode(err, _IOERR_SEEK)
|
|
}
|
|
|
|
func vfsLock(ctx context.Context, mod api.Module, pFile uint32, eLock LockLevel) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
err := file.Lock(eLock)
|
|
return vfsErrorCode(err, _IOERR_LOCK)
|
|
}
|
|
|
|
func vfsUnlock(ctx context.Context, mod api.Module, pFile uint32, eLock LockLevel) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
err := file.Unlock(eLock)
|
|
return vfsErrorCode(err, _IOERR_UNLOCK)
|
|
}
|
|
|
|
func vfsCheckReservedLock(ctx context.Context, mod api.Module, pFile, pResOut uint32) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
locked, err := file.CheckReservedLock()
|
|
|
|
var res uint32
|
|
if locked {
|
|
res = 1
|
|
}
|
|
|
|
util.WriteUint32(mod, pResOut, res)
|
|
return vfsErrorCode(err, _IOERR_CHECKRESERVEDLOCK)
|
|
}
|
|
|
|
func vfsFileControl(ctx context.Context, mod api.Module, pFile uint32, op _FcntlOpcode, pArg uint32) _ErrorCode {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
if file, ok := file.(fileControl); ok {
|
|
return file.fileControl(ctx, mod, op, pArg)
|
|
}
|
|
return vfsFileControlImpl(ctx, mod, file, op, pArg)
|
|
}
|
|
|
|
func vfsFileControlImpl(ctx context.Context, mod api.Module, file File, op _FcntlOpcode, pArg uint32) _ErrorCode {
|
|
switch op {
|
|
case _FCNTL_LOCKSTATE:
|
|
if file, ok := file.(FileLockState); ok {
|
|
if lk := file.LockState(); lk <= LOCK_EXCLUSIVE {
|
|
util.WriteUint32(mod, pArg, uint32(lk))
|
|
return _OK
|
|
}
|
|
}
|
|
|
|
case _FCNTL_PERSIST_WAL:
|
|
if file, ok := file.(FilePersistentWAL); ok {
|
|
if i := util.ReadUint32(mod, pArg); int32(i) >= 0 {
|
|
file.SetPersistentWAL(i != 0)
|
|
} else if file.PersistentWAL() {
|
|
util.WriteUint32(mod, pArg, 1)
|
|
} else {
|
|
util.WriteUint32(mod, pArg, 0)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
case _FCNTL_POWERSAFE_OVERWRITE:
|
|
if file, ok := file.(FilePowersafeOverwrite); ok {
|
|
if i := util.ReadUint32(mod, pArg); int32(i) >= 0 {
|
|
file.SetPowersafeOverwrite(i != 0)
|
|
} else if file.PowersafeOverwrite() {
|
|
util.WriteUint32(mod, pArg, 1)
|
|
} else {
|
|
util.WriteUint32(mod, pArg, 0)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
case _FCNTL_CHUNK_SIZE:
|
|
if file, ok := file.(FileChunkSize); ok {
|
|
size := util.ReadUint32(mod, pArg)
|
|
file.ChunkSize(int(size))
|
|
return _OK
|
|
}
|
|
|
|
case _FCNTL_SIZE_HINT:
|
|
if file, ok := file.(FileSizeHint); ok {
|
|
size := util.ReadUint64(mod, pArg)
|
|
err := file.SizeHint(int64(size))
|
|
return vfsErrorCode(err, _IOERR_TRUNCATE)
|
|
}
|
|
|
|
case _FCNTL_HAS_MOVED:
|
|
if file, ok := file.(FileHasMoved); ok {
|
|
moved, err := file.HasMoved()
|
|
var res uint32
|
|
if moved {
|
|
res = 1
|
|
}
|
|
util.WriteUint32(mod, pArg, res)
|
|
return vfsErrorCode(err, _IOERR_FSTAT)
|
|
}
|
|
|
|
case _FCNTL_OVERWRITE:
|
|
if file, ok := file.(FileOverwrite); ok {
|
|
err := file.Overwrite()
|
|
return vfsErrorCode(err, _IOERR)
|
|
}
|
|
|
|
case _FCNTL_COMMIT_PHASETWO:
|
|
if file, ok := file.(FileCommitPhaseTwo); ok {
|
|
err := file.CommitPhaseTwo()
|
|
return vfsErrorCode(err, _IOERR)
|
|
}
|
|
|
|
case _FCNTL_BEGIN_ATOMIC_WRITE:
|
|
if file, ok := file.(FileBatchAtomicWrite); ok {
|
|
err := file.BeginAtomicWrite()
|
|
return vfsErrorCode(err, _IOERR_BEGIN_ATOMIC)
|
|
}
|
|
case _FCNTL_COMMIT_ATOMIC_WRITE:
|
|
if file, ok := file.(FileBatchAtomicWrite); ok {
|
|
err := file.CommitAtomicWrite()
|
|
return vfsErrorCode(err, _IOERR_COMMIT_ATOMIC)
|
|
}
|
|
case _FCNTL_ROLLBACK_ATOMIC_WRITE:
|
|
if file, ok := file.(FileBatchAtomicWrite); ok {
|
|
err := file.RollbackAtomicWrite()
|
|
return vfsErrorCode(err, _IOERR_ROLLBACK_ATOMIC)
|
|
}
|
|
|
|
case _FCNTL_CKPT_START:
|
|
if file, ok := file.(FileCheckpoint); ok {
|
|
file.CheckpointStart()
|
|
return _OK
|
|
}
|
|
case _FCNTL_CKPT_DONE:
|
|
if file, ok := file.(FileCheckpoint); ok {
|
|
file.CheckpointDone()
|
|
return _OK
|
|
}
|
|
|
|
case _FCNTL_PRAGMA:
|
|
if file, ok := file.(FilePragma); ok {
|
|
ptr := util.ReadUint32(mod, pArg+1*ptrlen)
|
|
name := util.ReadString(mod, ptr, _MAX_SQL_LENGTH)
|
|
var value string
|
|
if ptr := util.ReadUint32(mod, pArg+2*ptrlen); ptr != 0 {
|
|
value = util.ReadString(mod, ptr, _MAX_SQL_LENGTH)
|
|
}
|
|
|
|
out, err := file.Pragma(strings.ToLower(name), value)
|
|
|
|
ret := vfsErrorCode(err, _ERROR)
|
|
if ret == _ERROR {
|
|
out = err.Error()
|
|
}
|
|
if out != "" {
|
|
fn := mod.ExportedFunction("sqlite3_malloc64")
|
|
stack := [...]uint64{uint64(len(out) + 1)}
|
|
if err := fn.CallWithStack(ctx, stack[:]); err != nil {
|
|
panic(err)
|
|
}
|
|
util.WriteUint32(mod, pArg, uint32(stack[0]))
|
|
util.WriteString(mod, uint32(stack[0]), out)
|
|
}
|
|
return ret
|
|
}
|
|
|
|
case _FCNTL_LOCK_TIMEOUT:
|
|
if file, ok := file.(FileSharedMemory); ok {
|
|
if shm, ok := file.SharedMemory().(blockingSharedMemory); ok {
|
|
shm.shmEnableBlocking(util.ReadUint32(mod, pArg) != 0)
|
|
return _OK
|
|
}
|
|
}
|
|
}
|
|
|
|
// Consider also implementing these opcodes (in use by SQLite):
|
|
// _FCNTL_BUSYHANDLER
|
|
// _FCNTL_LAST_ERRNO
|
|
// _FCNTL_SYNC
|
|
return _NOTFOUND
|
|
}
|
|
|
|
func vfsSectorSize(ctx context.Context, mod api.Module, pFile uint32) uint32 {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
return uint32(file.SectorSize())
|
|
}
|
|
|
|
func vfsDeviceCharacteristics(ctx context.Context, mod api.Module, pFile uint32) DeviceCharacteristic {
|
|
file := vfsFileGet(ctx, mod, pFile).(File)
|
|
return file.DeviceCharacteristics()
|
|
}
|
|
|
|
func vfsShmBarrier(ctx context.Context, mod api.Module, pFile uint32) {
|
|
shm := vfsFileGet(ctx, mod, pFile).(FileSharedMemory).SharedMemory()
|
|
shm.shmBarrier()
|
|
}
|
|
|
|
func vfsShmMap(ctx context.Context, mod api.Module, pFile uint32, iRegion, szRegion int32, bExtend, pp uint32) _ErrorCode {
|
|
shm := vfsFileGet(ctx, mod, pFile).(FileSharedMemory).SharedMemory()
|
|
p, rc := shm.shmMap(ctx, mod, iRegion, szRegion, bExtend != 0)
|
|
util.WriteUint32(mod, pp, p)
|
|
return rc
|
|
}
|
|
|
|
func vfsShmLock(ctx context.Context, mod api.Module, pFile uint32, offset, n int32, flags _ShmFlag) _ErrorCode {
|
|
shm := vfsFileGet(ctx, mod, pFile).(FileSharedMemory).SharedMemory()
|
|
return shm.shmLock(offset, n, flags)
|
|
}
|
|
|
|
func vfsShmUnmap(ctx context.Context, mod api.Module, pFile, bDelete uint32) _ErrorCode {
|
|
shm := vfsFileGet(ctx, mod, pFile).(FileSharedMemory).SharedMemory()
|
|
shm.shmUnmap(bDelete != 0)
|
|
return _OK
|
|
}
|
|
|
|
func vfsGet(mod api.Module, pVfs uint32) VFS {
|
|
var name string
|
|
if pVfs != 0 {
|
|
const zNameOffset = 16
|
|
name = util.ReadString(mod, util.ReadUint32(mod, pVfs+zNameOffset), _MAX_NAME)
|
|
}
|
|
if vfs := Find(name); vfs != nil {
|
|
return vfs
|
|
}
|
|
panic(util.NoVFSErr + util.ErrorString(name))
|
|
}
|
|
|
|
func vfsFileRegister(ctx context.Context, mod api.Module, pFile uint32, file File) {
|
|
const fileHandleOffset = 4
|
|
id := util.AddHandle(ctx, file)
|
|
util.WriteUint32(mod, pFile+fileHandleOffset, id)
|
|
}
|
|
|
|
func vfsFileGet(ctx context.Context, mod api.Module, pFile uint32) any {
|
|
const fileHandleOffset = 4
|
|
id := util.ReadUint32(mod, pFile+fileHandleOffset)
|
|
return util.GetHandle(ctx, id)
|
|
}
|
|
|
|
func vfsFileClose(ctx context.Context, mod api.Module, pFile uint32) error {
|
|
const fileHandleOffset = 4
|
|
id := util.ReadUint32(mod, pFile+fileHandleOffset)
|
|
return util.DelHandle(ctx, id)
|
|
}
|
|
|
|
func vfsErrorCode(err error, def _ErrorCode) _ErrorCode {
|
|
if err == nil {
|
|
return _OK
|
|
}
|
|
switch v := reflect.ValueOf(err); v.Kind() {
|
|
case reflect.Uint8, reflect.Uint16, reflect.Uint32:
|
|
return _ErrorCode(v.Uint())
|
|
}
|
|
return def
|
|
}
|