provider/google: Log HTTP requests and responses in DEBUG mode (#14281)

builtin/providers/google/config.go

@@ -8,6 +8,7 @@ import (
 	"runtime"
 	"strings"
 
+	"github.com/hashicorp/terraform/helper/logging"
 	"github.com/hashicorp/terraform/helper/pathorcontents"
 	"github.com/hashicorp/terraform/terraform"
 	"golang.org/x/oauth2"
@@ -95,6 +96,8 @@ func (c *Config) loadAndValidate() error {
 		}
 	}
 
+	client.Transport = logging.NewTransport("Google", client.Transport)
+
 	versionString := terraform.VersionString()
 	userAgent := fmt.Sprintf(
 		"(%s %s) Terraform/%s", runtime.GOOS, runtime.GOARCH, versionString)

helper/logging/transport.go

@@ -0,0 +1,53 @@
+package logging
+
+import (
+	"log"
+	"net/http"
+	"net/http/httputil"
+)
+
+type transport struct {
+	name      string
+	transport http.RoundTripper
+}
+
+func (t *transport) RoundTrip(req *http.Request) (*http.Response, error) {
+	if IsDebugOrHigher() {
+		reqData, err := httputil.DumpRequestOut(req, true)
+		if err == nil {
+			log.Printf("[DEBUG] "+logReqMsg, t.name, string(reqData))
+		} else {
+			log.Printf("[ERROR] %s API Request error: %#v", t.name, err)
+		}
+	}
+
+	resp, err := t.transport.RoundTrip(req)
+	if err != nil {
+		return resp, err
+	}
+
+	if IsDebugOrHigher() {
+		respData, err := httputil.DumpResponse(resp, true)
+		if err == nil {
+			log.Printf("[DEBUG] "+logRespMsg, t.name, string(respData))
+		} else {
+			log.Printf("[ERROR] %s API Response error: %#v", t.name, err)
+		}
+	}
+
+	return resp, nil
+}
+
+func NewTransport(name string, t http.RoundTripper) *transport {
+	return &transport{name, t}
+}
+
+const logReqMsg = `%s API Request Details:
+---[ REQUEST ]---------------------------------------
+%s
+-----------------------------------------------------`
+
+const logRespMsg = `%s API Response Details:
+---[ RESPONSE ]--------------------------------------
+%s
+-----------------------------------------------------`