1 files changed, 284 insertions, 0 deletions
diff --git a/src/net/net_fake.go b/src/net/net_fake.go
new file mode 100644
index 0000000..0c48dd5
--- /dev/null
+++ b/src/net/net_fake.go
@@ -0,0 +1,284 @@
+// 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. It is intended to allow tests of other package to pass.
+
+// +build js,wasm
+
+package net
+
+import (
+	"context"
+	"internal/poll"
+	"io"
+	"os"
+	"sync"
+	"syscall"
+	"time"
+)
+
+var listenersMu sync.Mutex
+var listeners = make(map[string]*netFD)
+
+var portCounterMu sync.Mutex
+var portCounter = 0
+
+func nextPort() int {
+	portCounterMu.Lock()
+	defer portCounterMu.Unlock()
+	portCounter++
+	return portCounter
+}
+
+// Network file descriptor.
+type netFD struct {
+	r        *bufferedPipe
+	w        *bufferedPipe
+	incoming chan *netFD
+
+	closedMu sync.Mutex
+	closed   bool
+
+	// immutable until Close
+	listener bool
+	family   int
+	sotype   int
+	net      string
+	laddr    Addr
+	raddr    Addr
+
+	// unused
+	pfd         poll.FD
+	isConnected bool // handshake completed or use of association with peer
+}
+
+// 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, ctrlFn func(string, string, syscall.RawConn) error) (*netFD, error) {
+	fd := &netFD{family: family, sotype: sotype, net: net}
+
+	if laddr != nil && raddr == nil { // listener
+		l := laddr.(*TCPAddr)
+		fd.laddr = &TCPAddr{
+			IP:   l.IP,
+			Port: nextPort(),
+			Zone: l.Zone,
+		}
+		fd.listener = true
+		fd.incoming = make(chan *netFD, 1024)
+		listenersMu.Lock()
+		listeners[fd.laddr.(*TCPAddr).String()] = fd
+		listenersMu.Unlock()
+		return fd, nil
+	}
+
+	fd.laddr = &TCPAddr{
+		IP:   IPv4(127, 0, 0, 1),
+		Port: nextPort(),
+	}
+	fd.raddr = raddr
+	fd.r = newBufferedPipe(65536)
+	fd.w = newBufferedPipe(65536)
+
+	fd2 := &netFD{family: fd.family, sotype: sotype, net: net}
+	fd2.laddr = fd.raddr
+	fd2.raddr = fd.laddr
+	fd2.r = fd.w
+	fd2.w = fd.r
+	listenersMu.Lock()
+	l, ok := listeners[fd.raddr.(*TCPAddr).String()]
+	if !ok {
+		listenersMu.Unlock()
+		return nil, syscall.ECONNREFUSED
+	}
+	l.incoming <- fd2
+	listenersMu.Unlock()
+
+	return fd, nil
+}
+
+func (fd *netFD) Read(p []byte) (n int, err error) {
+	return fd.r.Read(p)
+}
+
+func (fd *netFD) Write(p []byte) (nn int, err error) {
+	return fd.w.Write(p)
+}
+
+func (fd *netFD) Close() error {
+	fd.closedMu.Lock()
+	if fd.closed {
+		fd.closedMu.Unlock()
+		return nil
+	}
+	fd.closed = true
+	fd.closedMu.Unlock()
+
+	if fd.listener {
+		listenersMu.Lock()
+		delete(listeners, fd.laddr.String())
+		close(fd.incoming)
+		fd.listener = false
+		listenersMu.Unlock()
+		return nil
+	}
+
+	fd.r.Close()
+	fd.w.Close()
+	return nil
+}
+
+func (fd *netFD) closeRead() error {
+	fd.r.Close()
+	return nil
+}
+
+func (fd *netFD) closeWrite() error {
+	fd.w.Close()
+	return nil
+}
+
+func (fd *netFD) accept() (*netFD, error) {
+	c, ok := <-fd.incoming
+	if !ok {
+		return nil, syscall.EINVAL
+	}
+	return c, nil
+}
+
+func (fd *netFD) SetDeadline(t time.Time) error {
+	fd.r.SetReadDeadline(t)
+	fd.w.SetWriteDeadline(t)
+	return nil
+}
+
+func (fd *netFD) SetReadDeadline(t time.Time) error {
+	fd.r.SetReadDeadline(t)
+	return nil
+}
+
+func (fd *netFD) 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, syscall.EAGAIN
+			}
+			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, syscall.EAGAIN
+			}
+			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 *netFD) readFrom(p []byte) (n int, sa syscall.Sockaddr, err error) {
+	return 0, nil, syscall.ENOSYS
+}
+
+func (fd *netFD) readMsg(p []byte, oob []byte) (n, oobn, flags int, sa syscall.Sockaddr, err error) {
+	return 0, 0, 0, nil, syscall.ENOSYS
+}
+
+func (fd *netFD) writeTo(p []byte, sa syscall.Sockaddr) (n int, err error) {
+	return 0, syscall.ENOSYS
+}
+
+func (fd *netFD) writeMsg(p []byte, oob []byte, sa syscall.Sockaddr) (n int, oobn int, err error) {
+	return 0, 0, syscall.ENOSYS
+}
+
+func (fd *netFD) dup() (f *os.File, err error) {
+	return nil, syscall.ENOSYS
+}