Merge pull request #52512 from apelisse/truncate-body

Automatic merge from submit-queue (batch tested with PRs 53135, 52512, 48339). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

client-go: Truncate printed body based on Verbosity level

**What this PR does / why we need it**: If log verbosity is above 8, it will print the full request and response body. These might be very big (especially when downloading the openapi), and it takes multiple seconds just to print it ... Truncates the printing of that body if the level is less than 10.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: Vaguely related to #52089

**Special notes for your reviewer**:

**Release note**:
```release-note
NONE
```

staging/src/k8s.io/client-go/rest/request.go

@@ -823,6 +823,23 @@ func (r *Request) transformResponse(resp *http.Response, req *http.Request) Resu
 	}
 }
 
+// truncateBody decides if the body should be truncated, based on the glog Verbosity.
+func truncateBody(body string) string {
+	max := 0
+	switch {
+	case bool(glog.V(9)):
+		max = 10240
+	case bool(glog.V(8)):
+		max = 1024
+	}
+
+	if len(body) <= max {
+		return body
+	}
+
+	return body[:max] + fmt.Sprintf(" [truncated %d chars]", len(body)-max)
+}
+
 // glogBody logs a body output that could be either JSON or protobuf. It explicitly guards against
 // allocating a new string for the body output unless necessary. Uses a simple heuristic to determine
 // whether the body is printable.
@@ -831,9 +848,9 @@ func glogBody(prefix string, body []byte) {
 		if bytes.IndexFunc(body, func(r rune) bool {
 			return r < 0x0a
 		}) != -1 {
-			glog.Infof("%s:\n%s", prefix, hex.Dump(body))
+			glog.Infof("%s:\n%s", prefix, truncateBody(hex.Dump(body)))
 		} else {
-			glog.Infof("%s: %s", prefix, string(body))
+			glog.Infof("%s: %s", prefix, truncateBody(string(body)))
 		}
 	}
 }