1 files changed, 406 insertions, 0 deletions
diff --git a/src/net/net_fake.go b/src/net/net_fake.go
new file mode 100644
index 0000000..908767a
--- /dev/null
+++ b/src/net/net_fake.go
@@ -0,0 +1,406 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Fake networking for js/wasm and wasip1/wasm. It is intended to allow tests of other package to pass.
+
+//go:build (js && wasm) || wasip1
+
+package net
+
+import (
+	"context"
+	"io"
+	"os"
+	"sync"
+	"syscall"
+	"time"
+)
+
+var listenersMu sync.Mutex
+var listeners = make(map[fakeNetAddr]*netFD)
+
+var portCounterMu sync.Mutex
+var portCounter = 0
+
+func nextPort() int {
+	portCounterMu.Lock()
+	defer portCounterMu.Unlock()
+	portCounter++
+	return portCounter
+}
+
+type fakeNetAddr struct {
+	network string
+	address string
+}
+
+type fakeNetFD struct {
+	listener fakeNetAddr
+	r        *bufferedPipe
+	w        *bufferedPipe
+	incoming chan *netFD
+	closedMu sync.Mutex
+	closed   bool
+}
+
+// socket returns a network file descriptor that is ready for
+// asynchronous I/O using the network poller.
+func socket(ctx context.Context, net string, family, sotype, proto int, ipv6only bool, laddr, raddr sockaddr, ctrlCtxFn func(context.Context, string, string, syscall.RawConn) error) (*netFD, error) {
+	fd := &netFD{family: family, sotype: sotype, net: net}
+	if laddr != nil && raddr == nil {
+		return fakelistener(fd, laddr)
+	}
+	fd2 := &netFD{family: family, sotype: sotype, net: net}
+	return fakeconn(fd, fd2, laddr, raddr)
+}
+
+func fakeIPAndPort(ip IP, port int) (IP, int) {
+	if ip == nil {
+		ip = IPv4(127, 0, 0, 1)
+	}
+	if port == 0 {
+		port = nextPort()
+	}
+	return ip, port
+}
+
+func fakeTCPAddr(addr *TCPAddr) *TCPAddr {
+	var ip IP
+	var port int
+	var zone string
+	if addr != nil {
+		ip, port, zone = addr.IP, addr.Port, addr.Zone
+	}
+	ip, port = fakeIPAndPort(ip, port)
+	return &TCPAddr{IP: ip, Port: port, Zone: zone}
+}
+
+func fakeUDPAddr(addr *UDPAddr) *UDPAddr {
+	var ip IP
+	var port int
+	var zone string
+	if addr != nil {
+		ip, port, zone = addr.IP, addr.Port, addr.Zone
+	}
+	ip, port = fakeIPAndPort(ip, port)
+	return &UDPAddr{IP: ip, Port: port, Zone: zone}
+}
+
+func fakeUnixAddr(sotype int, addr *UnixAddr) *UnixAddr {
+	var net, name string
+	if addr != nil {
+		name = addr.Name
+	}
+	switch sotype {
+	case syscall.SOCK_DGRAM:
+		net = "unixgram"
+	case syscall.SOCK_SEQPACKET:
+		net = "unixpacket"
+	default:
+		net = "unix"
+	}
+	return &UnixAddr{Net: net, Name: name}
+}
+
+func fakelistener(fd *netFD, laddr sockaddr) (*netFD, error) {
+	switch l := laddr.(type) {
+	case *TCPAddr:
+		laddr = fakeTCPAddr(l)
+	case *UDPAddr:
+		laddr = fakeUDPAddr(l)
+	case *UnixAddr:
+		if l.Name == "" {
+			return nil, syscall.ENOENT
+		}
+		laddr = fakeUnixAddr(fd.sotype, l)
+	default:
+		return nil, syscall.EOPNOTSUPP
+	}
+
+	listener := fakeNetAddr{
+		network: laddr.Network(),
+		address: laddr.String(),
+	}
+
+	fd.fakeNetFD = &fakeNetFD{
+		listener: listener,
+		incoming: make(chan *netFD, 1024),
+	}
+
+	fd.laddr = laddr
+	listenersMu.Lock()
+	defer listenersMu.Unlock()
+	if _, exists := listeners[listener]; exists {
+		return nil, syscall.EADDRINUSE
+	}
+	listeners[listener] = fd
+	return fd, nil
+}
+
+func fakeconn(fd *netFD, fd2 *netFD, laddr, raddr sockaddr) (*netFD, error) {
+	switch r := raddr.(type) {
+	case *TCPAddr:
+		r = fakeTCPAddr(r)
+		raddr = r
+		laddr = fakeTCPAddr(laddr.(*TCPAddr))
+	case *UDPAddr:
+		r = fakeUDPAddr(r)
+		raddr = r
+		laddr = fakeUDPAddr(laddr.(*UDPAddr))
+	case *UnixAddr:
+		r = fakeUnixAddr(fd.sotype, r)
+		raddr = r
+		laddr = &UnixAddr{Net: r.Net, Name: r.Name}
+	default:
+		return nil, syscall.EAFNOSUPPORT
+	}
+	fd.laddr = laddr
+	fd.raddr = raddr
+
+	fd.fakeNetFD = &fakeNetFD{
+		r: newBufferedPipe(65536),
+		w: newBufferedPipe(65536),
+	}
+	fd2.fakeNetFD = &fakeNetFD{
+		r: fd.fakeNetFD.w,
+		w: fd.fakeNetFD.r,
+	}
+
+	fd2.laddr = fd.raddr
+	fd2.raddr = fd.laddr
+
+	listener := fakeNetAddr{
+		network: fd.raddr.Network(),
+		address: fd.raddr.String(),
+	}
+	listenersMu.Lock()
+	defer listenersMu.Unlock()
+	l, ok := listeners[listener]
+	if !ok {
+		return nil, syscall.ECONNREFUSED
+	}
+	l.incoming <- fd2
+	return fd, nil
+}
+
+func (fd *fakeNetFD) Read(p []byte) (n int, err error) {
+	return fd.r.Read(p)
+}
+
+func (fd *fakeNetFD) Write(p []byte) (nn int, err error) {
+	return fd.w.Write(p)
+}
+
+func (fd *fakeNetFD) Close() error {
+	fd.closedMu.Lock()
+	if fd.closed {
+		fd.closedMu.Unlock()
+		return nil
+	}
+	fd.closed = true
+	fd.closedMu.Unlock()
+
+	if fd.listener != (fakeNetAddr{}) {
+		listenersMu.Lock()
+		delete(listeners, fd.listener)
+		close(fd.incoming)
+		fd.listener = fakeNetAddr{}
+		listenersMu.Unlock()
+		return nil
+	}
+
+	fd.r.Close()
+	fd.w.Close()
+	return nil
+}
+
+func (fd *fakeNetFD) closeRead() error {
+	fd.r.Close()
+	return nil
+}
+
+func (fd *fakeNetFD) closeWrite() error {
+	fd.w.Close()
+	return nil
+}
+
+func (fd *fakeNetFD) accept() (*netFD, error) {
+	c, ok := <-fd.incoming
+	if !ok {
+		return nil, syscall.EINVAL
+	}
+	return c, nil
+}
+
+func (fd *fakeNetFD) SetDeadline(t time.Time) error {
+	fd.r.SetReadDeadline(t)
+	fd.w.SetWriteDeadline(t)
+	return nil
+}
+
+func (fd *fakeNetFD) SetReadDeadline(t time.Time) error {
+	fd.r.SetReadDeadline(t)
+	return nil
+}
+
+func (fd *fakeNetFD) SetWriteDeadline(t time.Time) error {
+	fd.w.SetWriteDeadline(t)
+	return nil
+}
+
+func newBufferedPipe(softLimit int) *bufferedPipe {
+	p := &bufferedPipe{softLimit: softLimit}
+	p.rCond.L = &p.mu
+	p.wCond.L = &p.mu
+	return p
+}
+
+type bufferedPipe struct {
+	softLimit int
+	mu        sync.Mutex
+	buf       []byte
+	closed    bool
+	rCond     sync.Cond
+	wCond     sync.Cond
+	rDeadline time.Time
+	wDeadline time.Time
+}
+
+func (p *bufferedPipe) Read(b []byte) (int, error) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	for {
+		if p.closed && len(p.buf) == 0 {
+			return 0, io.EOF
+		}
+		if !p.rDeadline.IsZero() {
+			d := time.Until(p.rDeadline)
+			if d <= 0 {
+				return 0, os.ErrDeadlineExceeded
+			}
+			time.AfterFunc(d, p.rCond.Broadcast)
+		}
+		if len(p.buf) > 0 {
+			break
+		}
+		p.rCond.Wait()
+	}
+
+	n := copy(b, p.buf)
+	p.buf = p.buf[n:]
+	p.wCond.Broadcast()
+	return n, nil
+}
+
+func (p *bufferedPipe) Write(b []byte) (int, error) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	for {
+		if p.closed {
+			return 0, syscall.ENOTCONN
+		}
+		if !p.wDeadline.IsZero() {
+			d := time.Until(p.wDeadline)
+			if d <= 0 {
+				return 0, os.ErrDeadlineExceeded
+			}
+			time.AfterFunc(d, p.wCond.Broadcast)
+		}
+		if len(p.buf) <= p.softLimit {
+			break
+		}
+		p.wCond.Wait()
+	}
+
+	p.buf = append(p.buf, b...)
+	p.rCond.Broadcast()
+	return len(b), nil
+}
+
+func (p *bufferedPipe) Close() {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	p.closed = true
+	p.rCond.Broadcast()
+	p.wCond.Broadcast()
+}
+
+func (p *bufferedPipe) SetReadDeadline(t time.Time) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	p.rDeadline = t
+	p.rCond.Broadcast()
+}
+
+func (p *bufferedPipe) SetWriteDeadline(t time.Time) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	p.wDeadline = t
+	p.wCond.Broadcast()
+}
+
+func sysSocket(family, sotype, proto int) (int, error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) connect(ctx context.Context, la, ra syscall.Sockaddr) (syscall.Sockaddr, error) {
+	return nil, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
+	return 0, nil, syscall.ENOSYS
+
+}
+func (fd *fakeNetFD) readFromInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) readFromInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) readMsg(p []byte, oob []byte, flags int) (n, oobn, retflags int, sa syscall.Sockaddr, err error) {
+	return 0, 0, 0, nil, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) readMsgInet4(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet4) (n, oobn, retflags int, err error) {
+	return 0, 0, 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) readMsgInet6(p []byte, oob []byte, flags int, sa *syscall.SockaddrInet6) (n, oobn, retflags int, err error) {
+	return 0, 0, 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeMsgInet4(p []byte, oob []byte, sa *syscall.SockaddrInet4) (n int, oobn int, err error) {
+	return 0, 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeMsgInet6(p []byte, oob []byte, sa *syscall.SockaddrInet6) (n int, oobn int, err error) {
+	return 0, 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeTo(p []byte, sa syscall.Sockaddr) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeToInet4(p []byte, sa *syscall.SockaddrInet4) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeToInet6(p []byte, sa *syscall.SockaddrInet6) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
+	return 0, 0, syscall.ENOSYS
+}
+
+func (fd *fakeNetFD) dup() (f *os.File, err error) {
+	return nil, syscall.ENOSYS
+}