new debug flag for json dumps

cmd/idrac_exporter/main.go

@@ -12,16 +12,23 @@ import (
 
 func main() {
 	var verbose bool
+	var debug bool
 	var configFile string
 	var err error
 
-	flag.BoolVar(&verbose, "verbose", false, "Set verbose logging")
+	flag.BoolVar(&verbose, "verbose", false, "Enable more verbose logging")
+	flag.BoolVar(&debug, "debug", false, "Dump JSON response from Redfish requests (only for debugging purpose)")
 	flag.StringVar(&configFile, "config", "/etc/prometheus/idrac.yml", "Path to idrac exporter configuration file")
 	flag.Parse()
 
 	log.Info("Build information: version=%s revision=%s", version.Version, version.Revision)
 	config.ReadConfig(configFile)
 
+	if debug {
+		config.Debug = true
+		verbose = true
+	}
+
 	if verbose {
 		log.SetLevel(log.LevelDebug)
 	}

internal/collector/client.go

@@ -4,6 +4,7 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 	"strconv"
 	"strings"
@@ -474,7 +475,16 @@ func (client *Client) redfishGet(path string, res interface{}) error {
 		return fmt.Errorf("%d %s", resp.StatusCode, resp.Status)
 	}
 
-	err = json.NewDecoder(resp.Body).Decode(res)
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Error("Error reading response from %q: %v", url, err)
+	}
+
+	if config.Debug {
+		log.Debug("Reponse from %q: %s", url, body)
+	}
+
+	err = json.Unmarshal(body, res)
 	if err != nil {
 		log.Error("Error decoding response from %q: %v", url, err)
 		return err

internal/config/config.go

@@ -10,6 +10,7 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+var Debug bool = false
 var Config RootConfig = RootConfig{
 	Hosts: make(map[string]*HostConfig),
 }