[experiment] add alternative wasm sqlite3 implementation available via build-tag (#2863)

This allows for building GoToSocial with [SQLite transpiled to WASM](https://github.com/ncruces/go-sqlite3) and accessed through [Wazero](https://wazero.io/).

1 files changed, 80 insertions, 0 deletions

diff --git a/vendor/github.com/tetratelabs/wazero/internal/sysfs/sock_windows.go b/vendor/github.com/tetratelabs/wazero/internal/sysfs/sock_windows.go
new file mode 100644
index 000000000..703df42fc
--- /dev/null
+++ b/vendor/github.com/tetratelabs/wazero/internal/sysfs/sock_windows.go
@@ -0,0 +1,80 @@
+//go:build windows
+
+package sysfs
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+
+	"github.com/tetratelabs/wazero/experimental/sys"
+	"github.com/tetratelabs/wazero/internal/fsapi"
+	socketapi "github.com/tetratelabs/wazero/internal/sock"
+)
+
+const (
+	// MSG_PEEK is the flag PEEK for syscall.Recvfrom on Windows.
+	// This constant is not exported on this platform.
+	MSG_PEEK = 0x2
+	// _FIONBIO is the flag to set the O_NONBLOCK flag on socket handles using ioctlsocket.
+	_FIONBIO = 0x8004667e
+)
+
+var (
+	// modws2_32 is WinSock.
+	modws2_32 = syscall.NewLazyDLL("ws2_32.dll")
+	// procrecvfrom exposes recvfrom from WinSock.
+	procrecvfrom = modws2_32.NewProc("recvfrom")
+	// procioctlsocket exposes ioctlsocket from WinSock.
+	procioctlsocket = modws2_32.NewProc("ioctlsocket")
+)
+
+func newTCPListenerFile(tl *net.TCPListener) socketapi.TCPSock {
+	return newDefaultTCPListenerFile(tl)
+}
+
+// recvfrom exposes the underlying syscall in Windows.
+//
+// Note: since we are only using this to expose MSG_PEEK,
+// we do not need really need all the parameters that are actually
+// allowed in WinSock.
+// We ignore `from *sockaddr` and `fromlen *int`.
+func recvfrom(s uintptr, buf []byte, flags int32) (n int, errno sys.Errno) {
+	var _p0 *byte
+	if len(buf) > 0 {
+		_p0 = &buf[0]
+	}
+	r0, _, e1 := syscall.SyscallN(
+		procrecvfrom.Addr(),
+		s,
+		uintptr(unsafe.Pointer(_p0)),
+		uintptr(len(buf)),
+		uintptr(flags),
+		0, // from *sockaddr (optional)
+		0) // fromlen *int (optional)
+	return int(r0), sys.UnwrapOSError(e1)
+}
+
+func setNonblockSocket(fd uintptr, enabled bool) sys.Errno {
+	opt := uint64(0)
+	if enabled {
+		opt = 1
+	}
+	// ioctlsocket(fd, FIONBIO, &opt)
+	_, _, errno := syscall.SyscallN(
+		procioctlsocket.Addr(),
+		uintptr(fd),
+		uintptr(_FIONBIO),
+		uintptr(unsafe.Pointer(&opt)))
+	return sys.UnwrapOSError(errno)
+}
+
+func _pollSock(conn syscall.Conn, flag fsapi.Pflag, timeoutMillis int32) (bool, sys.Errno) {
+	if flag != fsapi.POLLIN {
+		return false, sys.ENOTSUP
+	}
+	n, errno := syscallConnControl(conn, func(fd uintptr) (int, sys.Errno) {
+		return _poll([]pollFd{newPollFd(fd, _POLLIN, 0)}, timeoutMillis)
+	})
+	return n > 0, errno
+}