feat: add debug http logging (#346)

Add optional debug logging for dumping http requests and responses.

Signed-off-by: Blake Pettersson <blake.pettersson@gmail.com>

pkg/target/http/logroundtripper.go

@@ -0,0 +1,37 @@
+package http
+
+import (
+	"fmt"
+	"go.uber.org/zap"
+	"net/http"
+	"net/http/httputil"
+)
+
+func NewLoggingRoundTripper(roundTripper http.RoundTripper) http.RoundTripper {
+	return &logRoundTripper{roundTripper: roundTripper}
+}
+
+type logRoundTripper struct {
+	roundTripper http.RoundTripper
+}
+
+func (rt *logRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
+	logger := zap.L()
+	if logger.Core().Enabled(zap.DebugLevel) {
+		if info, err := httputil.DumpRequest(req, true); err == nil {
+			logger.Debug(fmt.Sprintf("Sending request: %s", string(info)))
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	resp, err := rt.roundTripper.RoundTrip(req)
+	if resp != nil {
+		if logger.Core().Enabled(zap.DebugLevel) {
+			if info, err := httputil.DumpResponse(resp, true); err == nil {
+				logger.Debug(fmt.Sprintf("Received response: %s", string(info)))
+			}
+		}
+	}
+	return resp, err
+}

pkg/target/http/utils.go

@@ -5,8 +5,8 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/json"
-	"io/ioutil"
 	"net/http"
+	"os"
 	"time"
 
 	"go.uber.org/zap"
@@ -86,11 +86,11 @@ func NewClient(certificatePath string, skipTLS bool) *http.Client {
 	}
 
 	client := &http.Client{
-		Transport: transport,
+		Transport: NewLoggingRoundTripper(transport),
 	}
 
 	if certificatePath != "" {
-		caCert, err := ioutil.ReadFile(certificatePath)
+		caCert, err := os.ReadFile(certificatePath)
 		if err != nil {
 			zap.L().Error("failed to read certificate", zap.String("path", certificatePath))
 			return client