enhanced default cluster selection, add 'cluster switch', overhaul json header setting (#47)

pkg/cfg/transport.go

@@ -0,0 +1,78 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cfg
+
+import (
+	"bytes"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"log/slog"
+	"net/http"
+
+	"github.com/elastic/elastic-transport-go/v8/elastictransport"
+)
+
+// used to print uri, path and body of a request made by the go-client
+type DebugTransport struct {
+	Transport http.RoundTripper
+}
+
+func (t *DebugTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	content := ""
+	contentline := ""
+
+	if req.ContentLength > 0 {
+		buf := new(bytes.Buffer)
+		body, _ := req.GetBody()
+
+		_, err := buf.ReadFrom(body)
+		if err != nil {
+			return nil, err
+		}
+
+		var pretty bytes.Buffer
+		err = json.Indent(&pretty, buf.Bytes(), "", "\t")
+		if err != nil {
+			return nil, fmt.Errorf("json parse error: %s", err)
+		}
+
+		content = pretty.String()
+		contentline = buf.String()
+	}
+
+	slog.Info("req", "host", req.URL.Host, "uri", req.URL.Path,
+		"body", content, "bodyline", contentline,
+		"headers", req.Header,
+	)
+
+	return t.Transport.RoundTrip(req)
+}
+
+func (conf *Config) getTransport() elastictransport.Option {
+	transport := &http.Transport{
+		TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+	}
+
+	if conf.DebugHTTP {
+		return elastictransport.WithTransport(
+			&DebugTransport{Transport: transport},
+		)
+	}
+
+	return elastictransport.WithTransport(transport)
+}