Cleaner aggregate errors API

pkg/api/errors/errors.go

@@ -22,7 +22,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 // StatusError is an error intended for consumption by a REST API server; it can also be
@@ -141,7 +141,7 @@ func NewInvalid(kind, name string, errs ValidationErrorList) error {
 			ID:     name,
 			Causes: causes,
 		},
-		Message: fmt.Sprintf("%s %q is invalid: %v", kind, name, util.SliceToError(errs)),
+		Message: fmt.Sprintf("%s %q is invalid: %v", kind, name, errors.NewAggregate(errs)),
 	}}
 }
 

pkg/api/validation/validation_test.go

@@ -26,6 +26,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/capabilities"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/registrytest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	utilerrors "github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 func expectPrefix(t *testing.T, prefix string, errs errors.ValidationErrorList) {
@@ -968,7 +969,7 @@ func TestValidateService(t *testing.T) {
 		registry.List = tc.existing
 		errs := ValidateService(&tc.svc, registry, api.NewDefaultContext())
 		if len(errs) != tc.numErrs {
-			t.Errorf("Unexpected error list for case %q: %v", tc.name, util.SliceToError(errs))
+			t.Errorf("Unexpected error list for case %q: %v", tc.name, utilerrors.NewAggregate(errs))
 		}
 	}
 

pkg/client/clientcmd/client_config.go

@@ -24,7 +24,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/clientauth"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 var (
@@ -227,7 +227,7 @@ func (config DirectClientConfig) ConfirmUsable() error {
 	validationErrors = append(validationErrors, validateAuthInfo(config.getAuthInfoName(), config.getAuthInfo())...)
 	validationErrors = append(validationErrors, validateClusterInfo(config.getClusterName(), config.getCluster())...)
 
-	return util.SliceToError(validationErrors)
+	return errors.NewAggregate(validationErrors)
 }
 
 func (config DirectClientConfig) getContextName() string {

pkg/client/clientcmd/validation.go

@@ -23,6 +23,7 @@ import (
 	"strings"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	utilerrors "github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 var ErrNoContext = errors.New("no context chosen")
@@ -67,7 +68,7 @@ func Validate(config Config) error {
 		validationErrors = append(validationErrors, validateClusterInfo(clusterName, clusterInfo)...)
 	}
 
-	return util.SliceToError(validationErrors)
+	return utilerrors.NewAggregate(validationErrors)
 }
 
 // ConfirmUsable looks a particular context and determines if that particular part of the config is useable.  There might still be errors in the config,
@@ -97,7 +98,7 @@ func ConfirmUsable(config Config, passedContextName string) error {
 		validationErrors = append(validationErrors, validateClusterInfo(context.Cluster, config.Clusters[context.Cluster])...)
 	}
 
-	return util.SliceToError(validationErrors)
+	return utilerrors.NewAggregate(validationErrors)
 }
 
 // validateClusterInfo looks for conflicts and errors in the cluster info

pkg/client/clientcmd/validation_test.go

@@ -22,7 +22,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 )
 
 func TestConfirmUsableBadInfoButOkConfig(t *testing.T) {
@@ -300,14 +300,14 @@ func (c configValidationTest) testContext(contextName string, t *testing.T) {
 			t.Errorf("Expected error containing: %v", c.expectedErrorSubstring)
 		}
 		for _, curr := range c.expectedErrorSubstring {
-			if len(errs) != 0 && !strings.Contains(util.SliceToError(errs).Error(), curr) {
-				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, util.SliceToError(errs))
+			if len(errs) != 0 && !strings.Contains(errors.NewAggregate(errs).Error(), curr) {
+				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, errors.NewAggregate(errs))
 			}
 		}
 
 	} else {
 		if len(errs) != 0 {
-			t.Errorf("Unexpected error: %v", util.SliceToError(errs))
+			t.Errorf("Unexpected error: %v", errors.NewAggregate(errs))
 		}
 	}
 }
@@ -357,14 +357,14 @@ func (c configValidationTest) testCluster(clusterName string, t *testing.T) {
 			t.Errorf("Expected error containing: %v", c.expectedErrorSubstring)
 		}
 		for _, curr := range c.expectedErrorSubstring {
-			if len(errs) != 0 && !strings.Contains(util.SliceToError(errs).Error(), curr) {
-				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, util.SliceToError(errs))
+			if len(errs) != 0 && !strings.Contains(errors.NewAggregate(errs).Error(), curr) {
+				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, errors.NewAggregate(errs))
 			}
 		}
 
 	} else {
 		if len(errs) != 0 {
-			t.Errorf("Unexpected error: %v", util.SliceToError(errs))
+			t.Errorf("Unexpected error: %v", errors.NewAggregate(errs))
 		}
 	}
 }
@@ -377,14 +377,14 @@ func (c configValidationTest) testAuthInfo(authInfoName string, t *testing.T) {
 			t.Errorf("Expected error containing: %v", c.expectedErrorSubstring)
 		}
 		for _, curr := range c.expectedErrorSubstring {
-			if len(errs) != 0 && !strings.Contains(util.SliceToError(errs).Error(), curr) {
-				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, util.SliceToError(errs))
+			if len(errs) != 0 && !strings.Contains(errors.NewAggregate(errs).Error(), curr) {
+				t.Errorf("Expected error containing: %v, but got %v", c.expectedErrorSubstring, errors.NewAggregate(errs))
 			}
 		}
 
 	} else {
 		if len(errs) != 0 {
-			t.Errorf("Unexpected error: %v", util.SliceToError(errs))
+			t.Errorf("Unexpected error: %v", errors.NewAggregate(errs))
 		}
 	}
 }

pkg/proxy/proxier.go

@@ -27,6 +27,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/iptables"
 	"github.com/golang/glog"
 )
@@ -575,7 +576,7 @@ func (proxier *Proxier) closePortal(service string, info *serviceInfo) error {
 	} else {
 		glog.Errorf("Some errors closing iptables portals for service %q", service)
 	}
-	return util.SliceToError(el)
+	return errors.NewAggregate(el)
 }
 
 func (proxier *Proxier) closeOnePortal(portalIP net.IP, portalPort int, protocol api.Protocol, proxyIP net.IP, proxyPort int, name string) []error {
@@ -646,7 +647,7 @@ func iptablesFlush(ipt iptables.Interface) error {
 	if len(el) != 0 {
 		glog.Errorf("Some errors flushing old iptables portals: %v", el)
 	}
-	return util.SliceToError(el)
+	return errors.NewAggregate(el)
 }
 
 // Used below.

pkg/util/errors/doc.go

@@ -0,0 +1,18 @@
+/*
+Copyright 2015 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package errors implements various utility functions and types around errors.
+package errors