Add annotation for client-body-buffer-size per location

Adds an annotation which allows for client-body-buffer-size to
be configured per specific locations specified in the ingress
resource yaml.

controllers/nginx/configuration.md

@@ -64,6 +64,7 @@ The following annotations are supported:
 |[ingress.kubernetes.io/upstream-fail-timeout](#custom-nginx-upstream-checks)|number|
 |[ingress.kubernetes.io/whitelist-source-range](#whitelist-source-range)|CIDR|
 |[ingress.kubernetes.io/server-alias](#server-alias)|string|
+|[ingress.kubernetes.io/client-body-buffer-size](#client-body-buffer-size)|string|
 
 #### Custom NGINX template
 
@@ -172,6 +173,23 @@ the new server configuration will take place over the alias configuration.
 
 For more information please see http://nginx.org/en/docs/http/ngx_http_core_module.html#server_name
 
+### Client Body Buffer Size
+
+Sets buffer size for reading client request body per location. In case the request body is larger than the buffer,
+the whole body or only its part is written to a temporary file. By default, buffer size is equal to two memory pages.
+This is 8K on x86, other 32-bit platforms, and x86-64. It is usually 16K on other 64-bit platforms. This annotation is
+applied to each location provided in the ingress rule.
+
+*Note:* The annotation value must be given in a valid format otherwise the 
+For example to set the client-body-buffer-size the following can be done:
+* `ingress.kubernetes.io/client-body-buffer-size: "1000"` # 1000 bytes
+* `ingress.kubernetes.io/client-body-buffer-size: 1k` # 1 kilobyte
+* `ingress.kubernetes.io/client-body-buffer-size: 1K` # 1 kilobyte
+* `ingress.kubernetes.io/client-body-buffer-size: 1m` # 1 megabyte
+* `ingress.kubernetes.io/client-body-buffer-size: 1M` # 1 megabyte
+
+For more information please see http://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_buffer_size
+
 ### External Authentication
 
 To use an existing service that provides authentication the Ingress rule can be annotated with `ingress.kubernetes.io/auth-url` to indicate the URL where the HTTP request should be sent.

controllers/nginx/pkg/template/template.go

@@ -251,7 +251,7 @@ func buildAuthResponseHeaders(input interface{}) []string {
 func buildLogFormatUpstream(input interface{}) string {
 	cfg, ok := input.(config.Configuration)
 	if !ok {
-		glog.Errorf("error  an ingress.buildLogFormatUpstream type but %T was returned", input)
+		glog.Errorf("error an ingress.buildLogFormatUpstream type but %T was returned", input)
 	}
 
 	return cfg.BuildLogFormatUpstream()

controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl

@@ -549,6 +549,9 @@ stream {
         proxy_ssl_server_name       on;
 
         client_max_body_size        "{{ $location.Proxy.BodySize }}";
+        {{ if $location.ClientBodyBufferSize }}
+        client_body_buffer_size     {{ $location.ClientBodyBufferSize }};
+        {{ end }}
 
         set $target {{ $location.ExternalAuth.URL }};
         proxy_pass $target;
@@ -615,6 +618,9 @@ stream {
         {{ end }}
 
         client_max_body_size                    "{{ $location.Proxy.BodySize }}";
+        {{ if $location.ClientBodyBufferSize }}
+        client_body_buffer_size                 {{ $location.ClientBodyBufferSize }};
+        {{ end }}
 
         proxy_set_header Host                   $best_http_host;
 

core/pkg/ingress/annotations/clientbodybuffersize/main.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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 clientbodybuffersize
+
+import (
+	extensions "k8s.io/api/extensions/v1beta1"
+
+	"k8s.io/ingress/core/pkg/ingress/annotations/parser"
+)
+
+const (
+	annotation = "ingress.kubernetes.io/client-body-buffer-size"
+)
+
+type clientBodyBufferSize struct {
+}
+
+// NewParser creates a new clientBodyBufferSize annotation parser
+func NewParser() parser.IngressAnnotation {
+	return clientBodyBufferSize{}
+}
+
+// Parse parses the annotations contained in the ingress rule
+// used to add an client-body-buffer-size to the provided locations
+func (a clientBodyBufferSize) Parse(ing *extensions.Ingress) (interface{}, error) {
+	return parser.GetStringAnnotation(annotation, ing)
+}

core/pkg/ingress/annotations/clientbodybuffersize/main_test.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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 clientbodybuffersize
+
+import (
+	"testing"
+
+	api "k8s.io/api/core/v1"
+	extensions "k8s.io/api/extensions/v1beta1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestParse(t *testing.T) {
+	ap := NewParser()
+	if ap == nil {
+		t.Fatalf("expected a parser.IngressAnnotation but returned nil")
+	}
+
+	testCases := []struct {
+		annotations map[string]string
+		expected    string
+	}{
+		{map[string]string{annotation: "8k"}, "8k"},
+		{map[string]string{annotation: "16k"}, "16k"},
+		{map[string]string{annotation: ""}, ""},
+		{map[string]string{}, ""},
+		{nil, ""},
+	}
+
+	ing := &extensions.Ingress{
+		ObjectMeta: meta_v1.ObjectMeta{
+			Name:      "foo",
+			Namespace: api.NamespaceDefault,
+		},
+		Spec: extensions.IngressSpec{},
+	}
+
+	for _, testCase := range testCases {
+		ing.SetAnnotations(testCase.annotations)
+		result, _ := ap.Parse(ing)
+		if result != testCase.expected {
+			t.Errorf("expected %v but returned %v, annotations: %s", testCase.expected, result, testCase.annotations)
+		}
+	}
+}

core/pkg/ingress/controller/annotations.go

@@ -39,6 +39,7 @@ import (
 	"k8s.io/ingress/core/pkg/ingress/annotations/sslpassthrough"
 	"k8s.io/ingress/core/pkg/ingress/errors"
 	"k8s.io/ingress/core/pkg/ingress/resolver"
+	"k8s.io/ingress/core/pkg/ingress/annotations/clientbodybuffersize"
 )
 
 type extractorConfig interface {
@@ -73,6 +74,7 @@ func newAnnotationExtractor(cfg extractorConfig) annotationExtractor {
 			"SSLPassthrough":       sslpassthrough.NewParser(),
 			"ConfigurationSnippet": snippet.NewParser(),
 			"Alias":                alias.NewParser(),
+			"ClientBodyBufferSize": clientbodybuffersize.NewParser(),
 		},
 	}
 }
@@ -106,12 +108,13 @@ func (e *annotationExtractor) Extract(ing *extensions.Ingress) map[string]interf
 }
 
 const (
-	secureUpstream  = "SecureUpstream"
-	healthCheck     = "HealthCheck"
-	sslPassthrough  = "SSLPassthrough"
-	sessionAffinity = "SessionAffinity"
-	serviceUpstream = "ServiceUpstream"
-	serverAlias     = "Alias"
+	secureUpstream       = "SecureUpstream"
+	healthCheck          = "HealthCheck"
+	sslPassthrough       = "SSLPassthrough"
+	sessionAffinity      = "SessionAffinity"
+	serviceUpstream      = "ServiceUpstream"
+	serverAlias          = "Alias"
+	clientBodyBufferSize = "ClientBodyBufferSize"
 )
 
 func (e *annotationExtractor) ServiceUpstream(ing *extensions.Ingress) bool {
@@ -143,6 +146,11 @@ func (e *annotationExtractor) Alias(ing *extensions.Ingress) string {
 	return val.(string)
 }
 
+func (e *annotationExtractor) ClientBodyBufferSize(ing *extensions.Ingress) string {
+	val, _ := e.annotations[clientBodyBufferSize].Parse(ing)
+	return val.(string)
+}
+
 func (e *annotationExtractor) SessionAffinity(ing *extensions.Ingress) *sessionaffinity.AffinityConfig {
 	val, _ := e.annotations[sessionAffinity].Parse(ing)
 	return val.(*sessionaffinity.AffinityConfig)

core/pkg/ingress/controller/controller.go

@@ -633,6 +633,9 @@ func (ic *GenericController) getBackendServers() ([]*ingress.Backend, []*ingress
 
 		anns := ic.annotations.Extract(ing)
 
+		// setup client-buffer-body-size based on annotations
+		clientBufferBodySizeAnnotation := ic.annotations.ClientBodyBufferSize(ing)
+
 		for _, rule := range ing.Spec.Rules {
 			host := rule.Host
 			if host == "" {
@@ -685,16 +688,18 @@ func (ic *GenericController) getBackendServers() ([]*ingress.Backend, []*ingress
 						}
 						break
 					}
+					loc.ClientBodyBufferSize = clientBufferBodySizeAnnotation
 				}
 				// is a new location
 				if addLoc {
 					glog.V(3).Infof("adding location %v in ingress rule %v/%v upstream %v", nginxPath, ing.Namespace, ing.Name, ups.Name)
 					loc := &ingress.Location{
-						Path:         nginxPath,
-						Backend:      ups.Name,
-						IsDefBackend: false,
-						Service:      ups.Service,
-						Port:         ups.Port,
+						Path:                 nginxPath,
+						Backend:              ups.Name,
+						IsDefBackend:         false,
+						Service:              ups.Service,
+						Port:                 ups.Port,
+						ClientBodyBufferSize: clientBufferBodySizeAnnotation,
 					}
 					mergeLocationAnnotations(loc, anns)
 					if loc.Redirect.FromToWWW {
@@ -1060,6 +1065,9 @@ func (ic *GenericController) createServers(data []interface{},
 			}
 		}
 
+		// setup client-buffer-body-size based on annotations
+		clientBufferBodySizeAnnotation := ic.annotations.ClientBodyBufferSize(ing)
+
 		for _, rule := range ing.Spec.Rules {
 			host := rule.Host
 			if host == "" {
@@ -1074,11 +1082,12 @@ func (ic *GenericController) createServers(data []interface{},
 				Hostname: host,
 				Locations: []*ingress.Location{
 					{
-						Path:         rootLocation,
-						IsDefBackend: true,
-						Backend:      un,
-						Proxy:        ngxProxy,
-						Service:      &api.Service{},
+						Path:                 rootLocation,
+						IsDefBackend:         true,
+						Backend:              un,
+						Proxy:                ngxProxy,
+						Service:              &api.Service{},
+						ClientBodyBufferSize: clientBufferBodySizeAnnotation,
 					},
 				}, SSLPassthrough: sslpt}
 		}

core/pkg/ingress/types.go

@@ -303,6 +303,10 @@ type Location struct {
 	// ConfigurationSnippet contains additional configuration for the backend
 	// to be considered in the configuration of the location
 	ConfigurationSnippet string `json:"configuration-snippet"`
+	// ClientBodyBufferSize allows for the configuration of the client body
+	// buffer size for a specific location.
+	// +optional
+	ClientBodyBufferSize string `json:"client-body-buffer-size,omitempty"`
 }
 
 // SSLPassthroughBackend describes a SSL upstream server configured

core/pkg/ingress/types_equals.go

@@ -379,6 +379,9 @@ func (l1 *Location) Equal(l2 *Location) bool {
 	if l1.ConfigurationSnippet != l2.ConfigurationSnippet {
 		return false
 	}
+	if l1.ClientBodyBufferSize != l2.ClientBodyBufferSize {
+		return false
+	}
 
 	return true
 }