mirror of
https://github.com/ncruces/go-sqlite3.git
synced 2026-01-12 05:59:14 +00:00
307 lines
8.2 KiB
Go
307 lines
8.2 KiB
Go
package sqlite3
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"io"
|
|
"io/fs"
|
|
"math/rand"
|
|
"os"
|
|
"path/filepath"
|
|
"runtime"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/ncruces/julianday"
|
|
"github.com/tetratelabs/wazero"
|
|
"github.com/tetratelabs/wazero/api"
|
|
"github.com/tetratelabs/wazero/sys"
|
|
)
|
|
|
|
func vfsInstantiate(ctx context.Context, r wazero.Runtime) (err error) {
|
|
wasi := r.NewHostModuleBuilder("wasi_snapshot_preview1")
|
|
wasi.NewFunctionBuilder().WithFunc(vfsExit).Export("proc_exit")
|
|
_, err = wasi.Instantiate(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
env := r.NewHostModuleBuilder("env")
|
|
env.NewFunctionBuilder().WithFunc(vfsLocaltime).Export("go_localtime")
|
|
env.NewFunctionBuilder().WithFunc(vfsRandomness).Export("go_randomness")
|
|
env.NewFunctionBuilder().WithFunc(vfsSleep).Export("go_sleep")
|
|
env.NewFunctionBuilder().WithFunc(vfsCurrentTime).Export("go_current_time")
|
|
env.NewFunctionBuilder().WithFunc(vfsCurrentTime64).Export("go_current_time_64")
|
|
env.NewFunctionBuilder().WithFunc(vfsFullPathname).Export("go_full_pathname")
|
|
env.NewFunctionBuilder().WithFunc(vfsDelete).Export("go_delete")
|
|
env.NewFunctionBuilder().WithFunc(vfsAccess).Export("go_access")
|
|
env.NewFunctionBuilder().WithFunc(vfsOpen).Export("go_open")
|
|
env.NewFunctionBuilder().WithFunc(vfsClose).Export("go_close")
|
|
env.NewFunctionBuilder().WithFunc(vfsRead).Export("go_read")
|
|
env.NewFunctionBuilder().WithFunc(vfsWrite).Export("go_write")
|
|
env.NewFunctionBuilder().WithFunc(vfsTruncate).Export("go_truncate")
|
|
env.NewFunctionBuilder().WithFunc(vfsSync).Export("go_sync")
|
|
env.NewFunctionBuilder().WithFunc(vfsFileSize).Export("go_file_size")
|
|
env.NewFunctionBuilder().WithFunc(vfsLock).Export("go_lock")
|
|
env.NewFunctionBuilder().WithFunc(vfsUnlock).Export("go_unlock")
|
|
env.NewFunctionBuilder().WithFunc(vfsCheckReservedLock).Export("go_check_reserved_lock")
|
|
_, err = env.Instantiate(ctx)
|
|
return err
|
|
}
|
|
|
|
func vfsExit(ctx context.Context, mod api.Module, exitCode uint32) {
|
|
// Ensure other callers see the exit code.
|
|
_ = mod.CloseWithExitCode(ctx, exitCode)
|
|
// Prevent any code from executing after this function.
|
|
panic(sys.NewExitError(mod.Name(), exitCode))
|
|
}
|
|
|
|
func vfsLocaltime(ctx context.Context, mod api.Module, t uint64, pTm uint32) uint32 {
|
|
tm := time.Unix(int64(t), 0)
|
|
var isdst int
|
|
if tm.IsDST() {
|
|
isdst = 1
|
|
}
|
|
|
|
// https://pubs.opengroup.org/onlinepubs/7908799/xsh/time.h.html
|
|
mem := memory{mod}
|
|
mem.writeUint32(pTm+0*ptrlen, uint32(tm.Second()))
|
|
mem.writeUint32(pTm+1*ptrlen, uint32(tm.Minute()))
|
|
mem.writeUint32(pTm+2*ptrlen, uint32(tm.Hour()))
|
|
mem.writeUint32(pTm+3*ptrlen, uint32(tm.Day()))
|
|
mem.writeUint32(pTm+4*ptrlen, uint32(tm.Month()-time.January))
|
|
mem.writeUint32(pTm+5*ptrlen, uint32(tm.Year()-1900))
|
|
mem.writeUint32(pTm+6*ptrlen, uint32(tm.Weekday()-time.Sunday))
|
|
mem.writeUint32(pTm+7*ptrlen, uint32(tm.YearDay()-1))
|
|
mem.writeUint32(pTm+8*ptrlen, uint32(isdst))
|
|
return _OK
|
|
}
|
|
|
|
func vfsRandomness(ctx context.Context, mod api.Module, pVfs, nByte, zByte uint32) uint32 {
|
|
mem := memory{mod}.mustRead(zByte, nByte)
|
|
n, _ := rand.Read(mem)
|
|
return uint32(n)
|
|
}
|
|
|
|
func vfsSleep(ctx context.Context, pVfs, nMicro uint32) uint32 {
|
|
time.Sleep(time.Duration(nMicro) * time.Microsecond)
|
|
return _OK
|
|
}
|
|
|
|
func vfsCurrentTime(ctx context.Context, mod api.Module, pVfs, prNow uint32) uint32 {
|
|
day := julianday.Float(time.Now())
|
|
memory{mod}.writeFloat64(prNow, day)
|
|
return _OK
|
|
}
|
|
|
|
func vfsCurrentTime64(ctx context.Context, mod api.Module, pVfs, piNow uint32) uint32 {
|
|
day, nsec := julianday.Date(time.Now())
|
|
msec := day*86_400_000 + nsec/1_000_000
|
|
memory{mod}.writeUint64(piNow, uint64(msec))
|
|
return _OK
|
|
}
|
|
|
|
func vfsFullPathname(ctx context.Context, mod api.Module, pVfs, zRelative, nFull, zFull uint32) uint32 {
|
|
rel := memory{mod}.readString(zRelative, _MAX_PATHNAME)
|
|
abs, err := filepath.Abs(rel)
|
|
if err != nil {
|
|
return uint32(IOERR)
|
|
}
|
|
|
|
// Consider either using [filepath.EvalSymlinks] to canonicalize the path (as the Unix VFS does).
|
|
// Or using [os.Readlink] to resolve a symbolic link (as the Unix VFS did).
|
|
// This might be buggy on Windows (the Windows VFS doesn't try).
|
|
|
|
siz := uint32(len(abs) + 1)
|
|
if siz > nFull {
|
|
return uint32(CANTOPEN_FULLPATH)
|
|
}
|
|
mem := memory{mod}.mustRead(zFull, siz)
|
|
|
|
mem[len(abs)] = 0
|
|
copy(mem, abs)
|
|
return _OK
|
|
}
|
|
|
|
func vfsDelete(ctx context.Context, mod api.Module, pVfs, zPath, syncDir uint32) uint32 {
|
|
path := memory{mod}.readString(zPath, _MAX_PATHNAME)
|
|
err := os.Remove(path)
|
|
if errors.Is(err, fs.ErrNotExist) {
|
|
return _OK
|
|
}
|
|
if err != nil {
|
|
return uint32(IOERR_DELETE)
|
|
}
|
|
if runtime.GOOS != "windows" && syncDir != 0 {
|
|
f, err := os.Open(filepath.Dir(path))
|
|
if err == nil {
|
|
err = f.Sync()
|
|
f.Close()
|
|
}
|
|
if err != nil {
|
|
return uint32(IOERR_DELETE)
|
|
}
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsAccess(ctx context.Context, mod api.Module, pVfs, zPath uint32, flags AccessFlag, pResOut uint32) uint32 {
|
|
// Consider using [syscall.Access] for [ACCESS_READWRITE]/[ACCESS_READ]
|
|
// (as the Unix VFS does).
|
|
|
|
path := memory{mod}.readString(zPath, _MAX_PATHNAME)
|
|
fi, err := os.Stat(path)
|
|
|
|
var res uint32
|
|
switch {
|
|
case flags == ACCESS_EXISTS:
|
|
switch {
|
|
case err == nil:
|
|
res = 1
|
|
case errors.Is(err, fs.ErrNotExist):
|
|
res = 0
|
|
default:
|
|
return uint32(IOERR_ACCESS)
|
|
}
|
|
|
|
case err == nil:
|
|
var want fs.FileMode = syscall.S_IRUSR
|
|
if flags == ACCESS_READWRITE {
|
|
want |= syscall.S_IWUSR
|
|
}
|
|
if fi.IsDir() {
|
|
want |= syscall.S_IXUSR
|
|
}
|
|
if fi.Mode()&want == want {
|
|
res = 1
|
|
} else {
|
|
res = 0
|
|
}
|
|
|
|
case errors.Is(err, fs.ErrPermission):
|
|
res = 0
|
|
|
|
default:
|
|
return uint32(IOERR_ACCESS)
|
|
}
|
|
|
|
memory{mod}.writeUint32(pResOut, res)
|
|
return _OK
|
|
}
|
|
|
|
func vfsOpen(ctx context.Context, mod api.Module, pVfs, zName, pFile uint32, flags OpenFlag, pOutFlags uint32) uint32 {
|
|
var oflags int
|
|
if flags&OPEN_EXCLUSIVE != 0 {
|
|
oflags |= os.O_EXCL
|
|
}
|
|
if flags&OPEN_CREATE != 0 {
|
|
oflags |= os.O_CREATE
|
|
}
|
|
if flags&OPEN_READONLY != 0 {
|
|
oflags |= os.O_RDONLY
|
|
}
|
|
if flags&OPEN_READWRITE != 0 {
|
|
oflags |= os.O_RDWR
|
|
}
|
|
|
|
var err error
|
|
var file *os.File
|
|
if zName == 0 {
|
|
file, err = os.CreateTemp("", "*.db")
|
|
} else {
|
|
name := memory{mod}.readString(zName, _MAX_PATHNAME)
|
|
file, err = os.OpenFile(name, oflags, 0600)
|
|
}
|
|
if err != nil {
|
|
return uint32(CANTOPEN)
|
|
}
|
|
|
|
if flags&OPEN_DELETEONCLOSE != 0 {
|
|
deleteOnClose(file)
|
|
}
|
|
|
|
info, err := file.Stat()
|
|
if err != nil {
|
|
return uint32(CANTOPEN)
|
|
}
|
|
if info.IsDir() {
|
|
return uint32(CANTOPEN_ISDIR)
|
|
}
|
|
id := vfsGetOpenFileID(file, info)
|
|
vfsFilePtr{mod, pFile}.SetID(id).SetLock(_NO_LOCK)
|
|
|
|
if pOutFlags != 0 {
|
|
memory{mod}.writeUint32(pOutFlags, uint32(flags))
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsClose(ctx context.Context, mod api.Module, pFile uint32) uint32 {
|
|
id := vfsFilePtr{mod, pFile}.ID()
|
|
err := vfsReleaseOpenFile(id)
|
|
if err != nil {
|
|
return uint32(IOERR_CLOSE)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsRead(ctx context.Context, mod api.Module, pFile, zBuf, iAmt uint32, iOfst uint64) uint32 {
|
|
buf := memory{mod}.mustRead(zBuf, iAmt)
|
|
|
|
file := vfsFilePtr{mod, pFile}.OSFile()
|
|
n, err := file.ReadAt(buf, int64(iOfst))
|
|
if n == int(iAmt) {
|
|
return _OK
|
|
}
|
|
if n == 0 && err != io.EOF {
|
|
return uint32(IOERR_READ)
|
|
}
|
|
for i := range buf[n:] {
|
|
buf[i] = 0
|
|
}
|
|
return uint32(IOERR_SHORT_READ)
|
|
}
|
|
|
|
func vfsWrite(ctx context.Context, mod api.Module, pFile, zBuf, iAmt uint32, iOfst uint64) uint32 {
|
|
buf := memory{mod}.mustRead(zBuf, iAmt)
|
|
|
|
file := vfsFilePtr{mod, pFile}.OSFile()
|
|
_, err := file.WriteAt(buf, int64(iOfst))
|
|
if err != nil {
|
|
return uint32(IOERR_WRITE)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsTruncate(ctx context.Context, mod api.Module, pFile uint32, nByte uint64) uint32 {
|
|
file := vfsFilePtr{mod, pFile}.OSFile()
|
|
err := file.Truncate(int64(nByte))
|
|
if err != nil {
|
|
return uint32(IOERR_TRUNCATE)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsSync(ctx context.Context, mod api.Module, pFile, flags uint32) uint32 {
|
|
file := vfsFilePtr{mod, pFile}.OSFile()
|
|
err := file.Sync()
|
|
if err != nil {
|
|
return uint32(IOERR_FSYNC)
|
|
}
|
|
return _OK
|
|
}
|
|
|
|
func vfsFileSize(ctx context.Context, mod api.Module, pFile, pSize uint32) uint32 {
|
|
// This uses [file.Seek] because we don't care about the offset for reading/writing.
|
|
// But consider using [file.Stat] instead (as other VFSes do).
|
|
|
|
file := vfsFilePtr{mod, pFile}.OSFile()
|
|
off, err := file.Seek(0, io.SeekEnd)
|
|
if err != nil {
|
|
return uint32(IOERR_SEEK)
|
|
}
|
|
|
|
memory{mod}.writeUint64(pSize, uint64(off))
|
|
return _OK
|
|
}
|