feat: add httpc/Service for convinience (zeromicro#1641)

rest/httpc/service.go

@@ -0,0 +1,39 @@
+package httpc
+
+import (
+	"io"
+	"net/http"
+)
+
+type (
+	Service interface {
+		Do(r *http.Request, opts ...Option) (*http.Response, error)
+		Get(url string, opts ...Option) (*http.Response, error)
+		Post(url, contentType string, body io.Reader, opts ...Option) (*http.Response, error)
+	}
+
+	namedService struct {
+		name string
+		opts []Option
+	}
+)
+
+func NewService(name string, opts ...Option) Service {
+	return namedService{
+		name: name,
+		opts: opts,
+	}
+}
+
+func (s namedService) Do(r *http.Request, opts ...Option) (*http.Response, error) {
+	return Do(s.name, r, append(s.opts, opts...)...)
+}
+
+func (s namedService) Get(url string, opts ...Option) (*http.Response, error) {
+	return Get(s.name, url, append(s.opts, opts...)...)
+}
+
+func (s namedService) Post(url, contentType string, body io.Reader, opts ...Option) (
+	*http.Response, error) {
+	return Post(s.name, url, contentType, body, append(s.opts, opts...)...)
+}

rest/httpc/service_test.go

@@ -0,0 +1,40 @@
+package httpc
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNamedService_Do(t *testing.T) {
+	svr := httptest.NewServer(http.RedirectHandler("/foo", http.StatusMovedPermanently))
+	req, err := http.NewRequest(http.MethodGet, svr.URL, nil)
+	assert.Nil(t, err)
+	service := NewService("foo")
+	_, err = service.Do(req)
+	// too many redirects
+	assert.NotNil(t, err)
+}
+
+func TestNamedService_Get(t *testing.T) {
+	svr := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	}))
+	service := NewService("foo")
+	resp, err := service.Get(svr.URL, func(cli *http.Client) {
+		cli.Transport = http.DefaultTransport
+	})
+	assert.Nil(t, err)
+	assert.Equal(t, http.StatusOK, resp.StatusCode)
+}
+
+func TestNamedService_Post(t *testing.T) {
+	svr := httptest.NewServer(http.NotFoundHandler())
+	service := NewService("foo")
+	_, err := service.Post("tcp://bad request", "application/json", nil)
+	assert.NotNil(t, err)
+	resp, err := service.Post(svr.URL, "application/json", nil)
+	assert.Nil(t, err)
+	assert.Equal(t, http.StatusNotFound, resp.StatusCode)
+}