add plugin http handler (#7289)

plugin/rpcplugin/http_test.go

@@ -0,0 +1,61 @@
+package rpcplugin
+
+import (
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func testHTTPResponseWriterRPC(w http.ResponseWriter, f func(w http.ResponseWriter)) {
+	r1, w1 := io.Pipe()
+	r2, w2 := io.Pipe()
+
+	c1 := NewMuxer(NewReadWriteCloser(r1, w2), false)
+	defer c1.Close()
+
+	c2 := NewMuxer(NewReadWriteCloser(r2, w1), true)
+	defer c2.Close()
+
+	id, server := c1.Serve()
+	go ServeHTTPResponseWriter(w, server)
+
+	remote := ConnectHTTPResponseWriter(c2.Connect(id))
+	defer remote.Close()
+
+	f(remote)
+}
+
+func TestHTTP(t *testing.T) {
+	w := httptest.NewRecorder()
+
+	testHTTPResponseWriterRPC(w, func(w http.ResponseWriter) {
+		headers := w.Header()
+		headers.Set("Test-Header-A", "a")
+		headers.Set("Test-Header-B", "b")
+		w.Header().Set("Test-Header-C", "c")
+		w.WriteHeader(http.StatusPaymentRequired)
+		n, err := w.Write([]byte("this is "))
+		assert.Equal(t, 8, n)
+		assert.NoError(t, err)
+		n, err = w.Write([]byte("a test"))
+		assert.Equal(t, 6, n)
+		assert.NoError(t, err)
+	})
+
+	r := w.Result()
+	defer r.Body.Close()
+
+	assert.Equal(t, http.StatusPaymentRequired, r.StatusCode)
+
+	body, err := ioutil.ReadAll(r.Body)
+	assert.NoError(t, err)
+	assert.EqualValues(t, "this is a test", body)
+
+	assert.Equal(t, "a", r.Header.Get("Test-Header-A"))
+	assert.Equal(t, "b", r.Header.Get("Test-Header-B"))
+	assert.Equal(t, "c", r.Header.Get("Test-Header-C"))
+}