177 lines
3.9 KiB
Go
177 lines
3.9 KiB
Go
package tcp
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import (
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"net"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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type HandlerTCPFunc func(WriteCloser)
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// ServeTCP calls f(conn).
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func (f HandlerTCPFunc) ServeTCP(conn WriteCloser) {
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f(conn)
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}
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// A constructor for middleware
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// that writes its own "tag" into the Conn and does nothing else.
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// Useful in checking if a chain is behaving in the right order.
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func tagMiddleware(tag string) Constructor {
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return func(h Handler) (Handler, error) {
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return HandlerTCPFunc(func(conn WriteCloser) {
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_, err := conn.Write([]byte(tag))
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if err != nil {
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panic("Unexpected")
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}
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h.ServeTCP(conn)
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}), nil
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}
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}
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var testApp = HandlerTCPFunc(func(conn WriteCloser) {
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_, err := conn.Write([]byte("app\n"))
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if err != nil {
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panic("unexpected")
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}
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})
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type myWriter struct {
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data []byte
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}
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func (mw *myWriter) Close() error {
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panic("implement me")
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}
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func (mw *myWriter) LocalAddr() net.Addr {
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panic("implement me")
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}
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func (mw *myWriter) RemoteAddr() net.Addr {
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panic("implement me")
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}
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func (mw *myWriter) SetDeadline(t time.Time) error {
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panic("implement me")
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}
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func (mw *myWriter) SetReadDeadline(t time.Time) error {
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panic("implement me")
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}
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func (mw *myWriter) SetWriteDeadline(t time.Time) error {
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panic("implement me")
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}
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func (mw *myWriter) Read(b []byte) (n int, err error) {
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panic("implement me")
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}
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func (mw *myWriter) Write(b []byte) (n int, err error) {
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mw.data = append(mw.data, b...)
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return len(mw.data), nil
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}
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func (mw *myWriter) CloseWrite() error {
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return nil
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}
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func TestNewChain(t *testing.T) {
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c1 := func(h Handler) (Handler, error) {
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return nil, nil
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}
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c2 := func(h Handler) (Handler, error) {
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return h, nil
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}
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slice := []Constructor{c1, c2}
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chain := NewChain(slice...)
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for k := range slice {
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assert.ObjectsAreEqual(chain.constructors[k], slice[k])
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}
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}
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func TestThenWorksWithNoMiddleware(t *testing.T) {
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handler, err := NewChain().Then(testApp)
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require.NoError(t, err)
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assert.ObjectsAreEqual(handler, testApp)
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}
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func TestThenTreatsNilAsError(t *testing.T) {
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handler, err := NewChain().Then(nil)
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require.Error(t, err)
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assert.Nil(t, handler)
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}
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func TestThenOrdersHandlersCorrectly(t *testing.T) {
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t1 := tagMiddleware("t1\n")
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t2 := tagMiddleware("t2\n")
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t3 := tagMiddleware("t3\n")
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chained, err := NewChain(t1, t2, t3).Then(testApp)
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require.NoError(t, err)
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conn := &myWriter{}
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chained.ServeTCP(conn)
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assert.Equal(t, "t1\nt2\nt3\napp\n", string(conn.data))
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}
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func TestAppendAddsHandlersCorrectly(t *testing.T) {
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chain := NewChain(tagMiddleware("t1\n"), tagMiddleware("t2\n"))
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newChain := chain.Append(tagMiddleware("t3\n"), tagMiddleware("t4\n"))
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assert.Len(t, chain.constructors, 2)
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assert.Len(t, newChain.constructors, 4)
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chained, err := newChain.Then(testApp)
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require.NoError(t, err)
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conn := &myWriter{}
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chained.ServeTCP(conn)
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assert.Equal(t, "t1\nt2\nt3\nt4\napp\n", string(conn.data))
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}
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func TestAppendRespectsImmutability(t *testing.T) {
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chain := NewChain(tagMiddleware(""))
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newChain := chain.Append(tagMiddleware(""))
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if &chain.constructors[0] == &newChain.constructors[0] {
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t.Error("Append does not respect immutability")
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}
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}
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func TestExtendAddsHandlersCorrectly(t *testing.T) {
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chain1 := NewChain(tagMiddleware("t1\n"), tagMiddleware("t2\n"))
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chain2 := NewChain(tagMiddleware("t3\n"), tagMiddleware("t4\n"))
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newChain := chain1.Extend(chain2)
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assert.Len(t, chain1.constructors, 2)
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assert.Len(t, chain2.constructors, 2)
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assert.Len(t, newChain.constructors, 4)
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chained, err := newChain.Then(testApp)
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require.NoError(t, err)
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conn := &myWriter{}
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chained.ServeTCP(conn)
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assert.Equal(t, "t1\nt2\nt3\nt4\napp\n", string(conn.data))
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}
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func TestExtendRespectsImmutability(t *testing.T) {
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chain := NewChain(tagMiddleware(""))
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newChain := chain.Extend(NewChain(tagMiddleware("")))
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if &chain.constructors[0] == &newChain.constructors[0] {
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t.Error("Extend does not respect immutability")
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}
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}
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