Add convenience wrappers for http.Get/Post, etc.

instrumentation/net/http/otelhttp/client.go

@@ -0,0 +1,58 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package otelhttp
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+var otelDefaultClient = &http.Client{Transport: NewTransport(http.DefaultTransport)}
+
+// Convenience replacement for http.Get
+func Get(ctx context.Context, url string) (resp *http.Response, err error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	return otelDefaultClient.Do(req)
+}
+
+// Convenience replacement for http.Head
+func Head(ctx context.Context, url string) (resp *http.Response, err error) {
+	req, err := http.NewRequestWithContext(ctx, "HEAD", url, nil)
+	if err != nil {
+		return nil, err
+	}
+	return otelDefaultClient.Do(req)
+}
+
+// Convenience replacement for http.Post
+func Post(ctx context.Context, url, contentType string, body io.Reader) (resp *http.Response, err error) {
+	req, err := http.NewRequestWithContext(ctx, "POST", url, body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", contentType)
+	return otelDefaultClient.Do(req)
+}
+
+// Convenience replacement for http.PostForm
+func PostForm(ctx context.Context, url string, data url.Values) (resp *http.Response, err error) {
+	return Post(ctx, url, "application/x-www-form-urlencoded", strings.NewReader(data.Encode()))
+}