micro/transport/mock/mock.go

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package mock
import (
"errors"
"fmt"
"math/rand"
"strings"
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"sync"
"time"
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"github.com/micro/go-micro/transport"
)
type mockSocket struct {
recv chan *transport.Message
send chan *transport.Message
// sock exit
exit chan bool
// listener exit
lexit chan bool
}
type mockClient struct {
*mockSocket
opts transport.DialOptions
}
type mockListener struct {
addr string
exit chan bool
conn chan *mockSocket
opts transport.ListenOptions
}
type mockTransport struct {
opts transport.Options
sync.Mutex
listeners map[string]*mockListener
}
func (ms *mockSocket) Recv(m *transport.Message) error {
select {
case <-ms.exit:
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return errors.New("connection closed")
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case <-ms.lexit:
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return errors.New("server connection closed")
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case cm := <-ms.recv:
*m = *cm
}
return nil
}
func (ms *mockSocket) Send(m *transport.Message) error {
select {
case <-ms.exit:
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return errors.New("connection closed")
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case <-ms.lexit:
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return errors.New("server connection closed")
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case ms.send <- m:
}
return nil
}
func (ms *mockSocket) Close() error {
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select {
case <-ms.exit:
return nil
default:
close(ms.exit)
}
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return nil
}
func (m *mockListener) Addr() string {
return m.addr
}
func (m *mockListener) Close() error {
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select {
case <-m.exit:
return nil
default:
close(m.exit)
}
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return nil
}
func (m *mockListener) Accept(fn func(transport.Socket)) error {
for {
select {
case <-m.exit:
return nil
case c := <-m.conn:
go fn(&mockSocket{
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lexit: c.lexit,
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exit: c.exit,
send: c.recv,
recv: c.send,
})
}
}
}
func (m *mockTransport) Dial(addr string, opts ...transport.DialOption) (transport.Client, error) {
m.Lock()
defer m.Unlock()
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 := &mockClient{
&mockSocket{
send: make(chan *transport.Message),
recv: make(chan *transport.Message),
exit: make(chan bool),
lexit: listener.exit,
},
options,
}
// pseudo connect
select {
case <-listener.exit:
return nil, errors.New("connection error")
case listener.conn <- client.mockSocket:
}
return client, nil
}
func (m *mockTransport) 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" {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
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)
}
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listener := &mockListener{
opts: options,
addr: addr,
conn: make(chan *mockSocket),
exit: make(chan bool),
}
m.listeners[addr] = listener
return listener, nil
}
func (m *mockTransport) Init(opts ...transport.Option) error {
for _, o := range opts {
o(&m.opts)
}
return nil
}
func (m *mockTransport) Options() transport.Options {
return m.opts
}
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func (m *mockTransport) String() string {
return "mock"
}
func NewTransport(opts ...transport.Option) transport.Transport {
var options transport.Options
for _, o := range opts {
o(&options)
}
return &mockTransport{
opts: options,
listeners: make(map[string]*mockListener),
}
}