package proxy import ( "fmt" "io" "log" "net" "sync/atomic" "time" "github.com/hashicorp/consul/lib/freeport" "github.com/mitchellh/go-testing-interface" "github.com/stretchr/testify/require" ) // TestLocalAddr makes a localhost address on the given port func TestLocalAddr(port int) string { return fmt.Sprintf("localhost:%d", port) } // TestTCPServer is a simple TCP echo server for use during tests. type TestTCPServer struct { l net.Listener stopped int32 accepted, closed, active int32 } // NewTestTCPServer opens as a listening socket on the given address and returns // a TestTCPServer serving requests to it. The server is already started and can // be stopped by calling Close(). func NewTestTCPServer(t testing.T) *TestTCPServer { port := freeport.GetT(t, 1) addr := TestLocalAddr(port[0]) l, err := net.Listen("tcp", addr) require.NoError(t, err) log.Printf("test tcp server listening on %s", addr) s := &TestTCPServer{ l: l, } go s.accept() return s } // Close stops the server func (s *TestTCPServer) Close() { atomic.StoreInt32(&s.stopped, 1) if s.l != nil { s.l.Close() } } // Addr returns the address that this server is listening on. func (s *TestTCPServer) Addr() net.Addr { return s.l.Addr() } func (s *TestTCPServer) accept() error { for { conn, err := s.l.Accept() if err != nil { if atomic.LoadInt32(&s.stopped) == 1 { log.Printf("test tcp echo server %s stopped", s.l.Addr()) return nil } log.Printf("test tcp echo server %s failed: %s", s.l.Addr(), err) return err } atomic.AddInt32(&s.accepted, 1) atomic.AddInt32(&s.active, 1) go func(c net.Conn) { io.Copy(c, c) atomic.AddInt32(&s.closed, 1) atomic.AddInt32(&s.active, -1) }(conn) } } // TestEchoConn attempts to write some bytes to conn and expects to read them // back within a short timeout (10ms). If prefix is not empty we expect it to be // poresent at the start of all echoed responses (for example to distinguish // between multiple echo server instances). func TestEchoConn(t testing.T, conn net.Conn, prefix string) { t.Helper() // Write some bytes and read them back n, err := conn.Write([]byte("Hello World")) require.Equal(t, 11, n) require.Nil(t, err) expectLen := 11 + len(prefix) buf := make([]byte, expectLen) // read until our buffer is full - it might be separate packets if prefix is // in use. got := 0 for got < expectLen { n, err = conn.Read(buf[got:]) require.Nilf(t, err, "err: %s", err) got += n } require.Equal(t, expectLen, got) require.Equal(t, prefix+"Hello World", string(buf[:])) // Addresses test flakiness around returning before Write or Read finish // see PR #4498 time.Sleep(time.Millisecond) }