/
mock_server.go
104 lines (90 loc) · 1.9 KB
/
mock_server.go
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package redistest
import (
"bufio"
"net"
"sync"
"testing"
"time"
"github.com/mna/redisc/redistest/resp"
"github.com/stretchr/testify/require"
)
// MockServer is a mock redis server.
type MockServer struct {
Addr string
done chan struct{}
wg sync.WaitGroup
h func(string, ...string) interface{}
t *testing.T
l net.Listener
}
// StartMockServer creates and starts a mock redis server. The handler is
// called for each command received by the server. The returned value is
// encoded in the redis protocol and sent to the client. The caller should close
// the server after use.
func StartMockServer(t *testing.T, handler func(cmd string, args ...string) interface{}) *MockServer {
l, err := net.Listen("tcp", ":0")
require.NoError(t, err, "net.Listen")
_, port, _ := net.SplitHostPort(l.Addr().String())
s := &MockServer{
Addr: ":" + port,
done: make(chan struct{}),
h: handler,
t: t,
l: l,
}
go s.serve()
return s
}
// Close closes the mock redis server.
func (s *MockServer) Close() {
select {
case <-s.done:
return
default:
}
require.NoError(s.t, s.l.Close(), "Close listener")
<-s.done
exit := make(chan struct{})
go func() {
s.wg.Wait()
close(exit)
}()
// wait for a few seconds for connections to finish, otherwise fail
select {
case <-exit:
return
case <-time.After(5 * time.Second):
s.t.Fatal("failed to cleanly stop the mock server")
}
}
func (s *MockServer) serve() {
defer close(s.done)
for {
conn, err := s.l.Accept()
if err != nil {
return
}
s.wg.Add(1)
go s.serveConn(conn)
}
}
func (s *MockServer) serveConn(c net.Conn) {
defer s.wg.Done()
go func() {
<-s.done
c.Close()
}()
br := bufio.NewReader(c)
for {
// Get the request
ar, err := resp.DecodeRequest(br)
if err != nil {
return
}
// Handle the response
v := s.h(ar[0], ar[1:]...)
if err := resp.Encode(c, v); err != nil {
panic(err)
}
}
}