micro/transport/memory/memory.go
Vasiliy Tolstov 29fa8de98e memory transport: fix race cond on channel close
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2019-07-11 01:21:03 +03:00

228 lines
3.9 KiB
Go

// Package memory is an in-memory transport
package memory
import (
"errors"
"fmt"
"math/rand"
"strings"
"sync"
"time"
"github.com/micro/go-micro/transport"
)
var (
r = rand.New(rand.NewSource(time.Now().UnixNano()))
)
type memorySocket struct {
recv chan *transport.Message
send chan *transport.Message
// sock exit
exit chan bool
// listener exit
lexit chan bool
local string
remote string
sync.RWMutex
}
type memoryClient struct {
*memorySocket
opts transport.DialOptions
}
type memoryListener struct {
addr string
exit chan bool
conn chan *memorySocket
opts transport.ListenOptions
sync.RWMutex
}
type memoryTransport struct {
opts transport.Options
sync.RWMutex
listeners map[string]*memoryListener
}
func (ms *memorySocket) Recv(m *transport.Message) error {
ms.RLock()
defer ms.RUnlock()
select {
case <-ms.exit:
return errors.New("connection closed")
case <-ms.lexit:
return errors.New("server connection closed")
case cm := <-ms.recv:
*m = *cm
}
return nil
}
func (ms *memorySocket) Local() string {
return ms.local
}
func (ms *memorySocket) Remote() string {
return ms.remote
}
func (ms *memorySocket) Send(m *transport.Message) error {
ms.RLock()
defer ms.RUnlock()
select {
case <-ms.exit:
return errors.New("connection closed")
case <-ms.lexit:
return errors.New("server connection closed")
case ms.send <- m:
}
return nil
}
func (ms *memorySocket) Close() error {
ms.RLock()
defer ms.RUnlock()
select {
case <-ms.exit:
return nil
default:
close(ms.exit)
}
return nil
}
func (m *memoryListener) Addr() string {
return m.addr
}
func (m *memoryListener) Close() error {
m.Lock()
defer m.Unlock()
select {
case <-m.exit:
return nil
default:
close(m.exit)
}
return nil
}
func (m *memoryListener) Accept(fn func(transport.Socket)) error {
for {
select {
case <-m.exit:
return nil
case c := <-m.conn:
go fn(&memorySocket{
lexit: c.lexit,
exit: c.exit,
send: c.recv,
recv: c.send,
local: c.Remote(),
remote: c.Local(),
})
}
}
}
func (m *memoryTransport) Dial(addr string, opts ...transport.DialOption) (transport.Client, error) {
m.RLock()
defer m.RUnlock()
listener, ok := m.listeners[addr]
if !ok {
return nil, errors.New("could not dial " + addr)
}
var options transport.DialOptions
for _, o := range opts {
o(&options)
}
client := &memoryClient{
&memorySocket{
send: make(chan *transport.Message),
recv: make(chan *transport.Message),
exit: make(chan bool),
lexit: listener.exit,
local: addr,
remote: addr,
},
options,
}
// pseudo connect
select {
case <-listener.exit:
return nil, errors.New("connection error")
case listener.conn <- client.memorySocket:
}
return client, nil
}
func (m *memoryTransport) Listen(addr string, opts ...transport.ListenOption) (transport.Listener, error) {
m.Lock()
defer m.Unlock()
var options transport.ListenOptions
for _, o := range opts {
o(&options)
}
parts := strings.Split(addr, ":")
// if zero port then randomly assign one
if len(parts) > 1 && parts[len(parts)-1] == "0" {
i := r.Intn(10000)
// set addr with port
addr = fmt.Sprintf("%s:%d", parts[:len(parts)-1], 10000+i)
}
if _, ok := m.listeners[addr]; ok {
return nil, errors.New("already listening on " + addr)
}
listener := &memoryListener{
opts: options,
addr: addr,
conn: make(chan *memorySocket),
exit: make(chan bool),
}
m.listeners[addr] = listener
return listener, nil
}
func (m *memoryTransport) Init(opts ...transport.Option) error {
for _, o := range opts {
o(&m.opts)
}
return nil
}
func (m *memoryTransport) Options() transport.Options {
return m.opts
}
func (m *memoryTransport) String() string {
return "memory"
}
func NewTransport(opts ...transport.Option) transport.Transport {
var options transport.Options
for _, o := range opts {
o(&options)
}
return &memoryTransport{
opts: options,
listeners: make(map[string]*memoryListener),
}
}