Increase log verbosity, namely for object updates.

- add a new environment variable for triggering debug log level
- show both new, old object and diff during syncs and updates
- use pretty package to pretty-print go structures
-

pkg/util/config/config.go

@@ -38,6 +38,7 @@ type Config struct {
 	DockerImage        string `split_words:"true",default:"registry.opensource.zalan.do/acid/spilo-9.6:1.2-p12"`
 	ServiceAccountName string `split_words:"true",default:"operator"`
 	DbHostedZone       string `split_words:"true",default:"db.example.com"`
+	DebugLogging       bool   `split_words:"true",default:"false"`
 }
 
 func LoadFromEnv() *Config {

pkg/util/util.go

@@ -3,10 +3,13 @@ package util
 import (
 	"crypto/md5"
 	"encoding/hex"
+	"encoding/json"
 	"fmt"
 	"math/rand"
 	"time"
 
+	"github.com/kr/pretty"
+
 	"github.bus.zalan.do/acid/postgres-operator/pkg/spec"
 	"k8s.io/client-go/pkg/api/v1"
 	"k8s.io/client-go/pkg/types"
@@ -60,3 +63,18 @@ func PGUserPassword(user spec.PgUser) string {
 
 	return "md5" + hex.EncodeToString(s[:])
 }
+
+func Pretty(x interface {}) (f fmt.Formatter) {
+	return pretty.Formatter(x)
+}
+
+func PrettyDiff(a, b interface{}) (result string) {
+	diff := pretty.Diff(a, b)
+	json, err := json.MarshalIndent(diff, "", " ")
+	if err != nil {
+		result = fmt.Sprintf("%v", diff)
+	} else {
+		result = string(json)
+	}
+	return
+}