Wrap errors in client

buildkite/client.go

@@ -52,7 +52,7 @@ func (client *Client) makeRequest(method string, path string, postData interface
 	if postData != nil {
 		jsonPayload, err := json.Marshal(postData)
 		if err != nil {
-			return err
+			return fmt.Errorf("failed to marshal request: %w", err)
 		}
 		bodyBytes = bytes.NewBuffer(jsonPayload)
 	}
@@ -61,27 +61,27 @@ func (client *Client) makeRequest(method string, path string, postData interface
 
 	req, err := http.NewRequest(method, url, bodyBytes)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to create request: %w", err)
 	}
 
 	req.Header.Add("User-Agent", client.userAgent)
 
 	resp, err := client.http.Do(req)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to send request: %w", err)
 	}
 	if resp.StatusCode >= 400 {
 		return fmt.Errorf("Buildkite API request failed: %s %s (status: %d)", method, url, resp.StatusCode)
 	}
-
 	defer resp.Body.Close()
+
 	responseBody, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to read response: %w", err)
 	}
 
 	if err := json.Unmarshal(responseBody, responseObject); err != nil {
-		return err
+		return fmt.Errorf("failed to unmarshal response: %w", err)
 	}
 
 	return nil