micro/network/transport/memory.go

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package transport
import (
"context"
"errors"
"fmt"
"net"
"sync"
"time"
maddr "github.com/unistack-org/micro/v3/util/addr"
mnet "github.com/unistack-org/micro/v3/util/net"
"github.com/unistack-org/micro/v3/util/rand"
)
type memorySocket struct {
recv chan *Message
send chan *Message
// sock exit
exit chan bool
// listener exit
lexit chan bool
local string
remote string
// for send/recv transport.Timeout
timeout time.Duration
ctx context.Context
sync.RWMutex
}
type memoryClient struct {
*memorySocket
opts DialOptions
}
type memoryListener struct {
addr string
exit chan bool
conn chan *memorySocket
lopts ListenOptions
topts Options
sync.RWMutex
ctx context.Context
}
type memoryTransport struct {
opts Options
sync.RWMutex
listeners map[string]*memoryListener
}
func (ms *memorySocket) Recv(m *Message) error {
ms.RLock()
defer ms.RUnlock()
ctx := ms.ctx
if ms.timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ms.ctx, ms.timeout)
defer cancel()
}
select {
case <-ctx.Done():
return ctx.Err()
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 *Message) error {
ms.RLock()
defer ms.RUnlock()
ctx := ms.ctx
if ms.timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ms.ctx, ms.timeout)
defer cancel()
}
select {
case <-ctx.Done():
return ctx.Err()
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.Lock()
defer ms.Unlock()
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(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(),
timeout: m.topts.Timeout,
ctx: m.topts.Context,
})
}
}
}
func (m *memoryTransport) Dial(ctx context.Context, addr string, opts ...DialOption) (Client, error) {
m.RLock()
defer m.RUnlock()
listener, ok := m.listeners[addr]
if !ok {
return nil, errors.New("could not dial " + addr)
}
options := NewDialOptions(opts...)
client := &memoryClient{
&memorySocket{
send: make(chan *Message),
recv: make(chan *Message),
exit: make(chan bool),
lexit: listener.exit,
local: addr,
remote: addr,
timeout: m.opts.Timeout,
ctx: m.opts.Context,
},
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(ctx context.Context, addr string, opts ...ListenOption) (Listener, error) {
m.Lock()
defer m.Unlock()
options := NewListenOptions(opts...)
host, port, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
addr, err = maddr.Extract(host)
if err != nil {
return nil, err
}
// if zero port then randomly assign one
if len(port) > 0 && port == "0" {
var rng rand.Rand
i := rng.Intn(20000)
port = fmt.Sprintf("%d", 10000+i)
}
// set addr with port
addr = mnet.HostPort(addr, port)
if _, ok := m.listeners[addr]; ok {
return nil, errors.New("already listening on " + addr)
}
listener := &memoryListener{
lopts: options,
topts: m.opts,
addr: addr,
conn: make(chan *memorySocket),
exit: make(chan bool),
ctx: m.opts.Context,
}
m.listeners[addr] = listener
return listener, nil
}
func (m *memoryTransport) Init(opts ...Option) error {
for _, o := range opts {
o(&m.opts)
}
return nil
}
func (m *memoryTransport) Options() Options {
return m.opts
}
func (m *memoryTransport) String() string {
return "memory"
}
func (m *memoryTransport) Name() string {
return m.opts.Name
}
// NewTransport returns new memory transport with options
func NewTransport(opts ...Option) Transport {
options := NewOptions(opts...)
return &memoryTransport{
opts: options,
listeners: make(map[string]*memoryListener),
}
}