1 files changed, 56 insertions, 0 deletions
diff --git a/workhorse/internal/helper/countingresponsewriter.go b/workhorse/internal/helper/countingresponsewriter.go
new file mode 100644
index 00000000000..a79d51d4c6a
--- /dev/null
+++ b/workhorse/internal/helper/countingresponsewriter.go
@@ -0,0 +1,56 @@
+package helper
+
+import (
+	"net/http"
+)
+
+type CountingResponseWriter interface {
+	http.ResponseWriter
+	Count() int64
+	Status() int
+}
+
+type countingResponseWriter struct {
+	rw     http.ResponseWriter
+	status int
+	count  int64
+}
+
+func NewCountingResponseWriter(rw http.ResponseWriter) CountingResponseWriter {
+	return &countingResponseWriter{rw: rw}
+}
+
+func (c *countingResponseWriter) Header() http.Header {
+	return c.rw.Header()
+}
+
+func (c *countingResponseWriter) Write(data []byte) (int, error) {
+	if c.status == 0 {
+		c.WriteHeader(http.StatusOK)
+	}
+
+	n, err := c.rw.Write(data)
+	c.count += int64(n)
+	return n, err
+}
+
+func (c *countingResponseWriter) WriteHeader(status int) {
+	if c.status != 0 {
+		return
+	}
+
+	c.status = status
+	c.rw.WriteHeader(status)
+}
+
+// Count returns the number of bytes written to the ResponseWriter. This
+// function is not thread-safe.
+func (c *countingResponseWriter) Count() int64 {
+	return c.count
+}
+
+// Status returns the first HTTP status value that was written to the
+// ResponseWriter. This function is not thread-safe.
+func (c *countingResponseWriter) Status() int {
+	return c.status
+}