Add Patroni failsafe_mode parameter (#2076)

This commit adds support of a not-yet-released Patroni feature that allows postgres to run as primary in case of a failed leader lock update.
* Add Patroni 'failsafe_mode' local parameter (enable for a single PG cluster)
* Allow configuring Patroni 'failsafe_mode' parameter globally

pkg/apis/acid.zalan.do/v1/crds.go

@@ -503,6 +503,9 @@ var PostgresCRDResourceValidation = apiextv1.CustomResourceValidation{
 					"patroni": {
 						Type: "object",
 						Properties: map[string]apiextv1.JSONSchemaProps{
+							"failsafe_mode": {
+								Type: "boolean",
+							},
 							"initdb": {
 								Type: "object",
 								AdditionalProperties: &apiextv1.JSONSchemaPropsOrBool{
@@ -1458,6 +1461,14 @@ var OperatorConfigCRDResourceValidation = apiextv1.CustomResourceValidation{
 							},
 						},
 					},
+					"patroni": {
+						Type: "object",
+						Properties: map[string]apiextv1.JSONSchemaProps{
+							"failsafe_mode": {
+								Type: "boolean",
+							},
+						},
+					},
 					"postgres_pod_resources": {
 						Type: "object",
 						Properties: map[string]apiextv1.JSONSchemaProps{

pkg/apis/acid.zalan.do/v1/operator_configuration_type.go

@@ -227,6 +227,11 @@ type OperatorLogicalBackupConfiguration struct {
 	JobPrefix                    string `json:"logical_backup_job_prefix,omitempty"`
 }
 
+// PatroniConfiguration defines configuration for Patroni
+type PatroniConfiguration struct {
+	FailsafeMode *bool `json:"failsafe_mode,omitempty"`
+}
+
 // OperatorConfigurationData defines the operation config
 type OperatorConfigurationData struct {
 	EnableCRDRegistration         *bool                              `json:"enable_crd_registration,omitempty"`
@@ -259,11 +264,12 @@ type OperatorConfigurationData struct {
 	Scalyr                        ScalyrConfiguration                `json:"scalyr"`
 	LogicalBackup                 OperatorLogicalBackupConfiguration `json:"logical_backup"`
 	ConnectionPooler              ConnectionPoolerConfiguration      `json:"connection_pooler"`
+	Patroni                       PatroniConfiguration               `json:"patroni"`
 
 	MinInstances                      int32  `json:"min_instances,omitempty"`
 	MaxInstances                      int32  `json:"max_instances,omitempty"`
 	IgnoreInstanceLimitsAnnotationKey string `json:"ignore_instance_limits_annotation_key,omitempty"`
 }
 
-//Duration shortens this frequently used name
+// Duration shortens this frequently used name
 type Duration time.Duration

pkg/apis/acid.zalan.do/v1/postgresql_type.go

@@ -171,6 +171,7 @@ type Patroni struct {
 	SynchronousMode       bool                         `json:"synchronous_mode,omitempty"`
 	SynchronousModeStrict bool                         `json:"synchronous_mode_strict,omitempty"`
 	SynchronousNodeCount  uint32                       `json:"synchronous_node_count,omitempty" defaults:"1"`
+	FailsafeMode          *bool                        `json:"failsafe_mode,omitempty"`
 }
 
 // StandbyDescription contains remote primary config or s3/gs wal path

pkg/apis/acid.zalan.do/v1/zz_generated.deepcopy.go

@@ -423,6 +423,7 @@ func (in *OperatorConfigurationData) DeepCopyInto(out *OperatorConfigurationData
 	out.Scalyr = in.Scalyr
 	out.LogicalBackup = in.LogicalBackup
 	in.ConnectionPooler.DeepCopyInto(&out.ConnectionPooler)
+	in.Patroni.DeepCopyInto(&out.Patroni)
 	return
 }
 
@@ -549,6 +550,11 @@ func (in *Patroni) DeepCopyInto(out *Patroni) {
 			(*out)[key] = outVal
 		}
 	}
+	if in.FailsafeMode != nil {
+		in, out := &in.FailsafeMode, &out.FailsafeMode
+		*out = new(bool)
+		**out = **in
+	}
 	return
 }
 
@@ -562,6 +568,27 @@ func (in *Patroni) DeepCopy() *Patroni {
 	return out
 }
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *PatroniConfiguration) DeepCopyInto(out *PatroniConfiguration) {
+	*out = *in
+	if in.FailsafeMode != nil {
+		in, out := &in.FailsafeMode, &out.FailsafeMode
+		*out = new(bool)
+		**out = **in
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PatroniConfiguration.
+func (in *PatroniConfiguration) DeepCopy() *PatroniConfiguration {
+	if in == nil {
+		return nil
+	}
+	out := new(PatroniConfiguration)
+	in.DeepCopyInto(out)
+	return out
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *PostgresPodResourcesDefaults) DeepCopyInto(out *PostgresPodResourcesDefaults) {
 	*out = *in