update vendor kube-openapi

Godeps/Godeps.json

@@ -1062,6 +1062,7 @@
 		},
 		{
 			"ImportPath": "github.com/docker/libnetwork/ipvs",
+			"Comment": "v0.8.0-dev.2-840-gc3393f1d",
 			"Rev": "c3393f1d3e1ba69b596eca45a9f1da9398e17ca5"
 		},
 		{
@@ -3099,27 +3100,35 @@
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/aggregator",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/builder",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/common",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/generators",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/handler",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/util",
-			"Rev": "868f2f29720b192240e18284659231b440f9cda5"
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
+		},
+		{
+			"ImportPath": "k8s.io/kube-openapi/pkg/util/proto",
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
+		},
+		{
+			"ImportPath": "k8s.io/kube-openapi/pkg/util/proto/testing",
+			"Rev": "76a6671bcfb1d229fc7fd543aee23ddff6b5fc7e"
 		},
 		{
 			"ImportPath": "k8s.io/utils/exec",

vendor/github.com/vishvananda/netns/BUILD

-package(default_visibility = ["//visibility:public"])
-
-licenses(["notice"])
-
-load(
-    "@io_bazel_rules_go//go:def.bzl",
-    "go_library",
-)
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
 
 go_library(
     name = "go_default_library",
@@ -18,7 +11,7 @@ go_library(
         ],
         "//conditions:default": [],
     }),
-    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
 )
 
 filegroup(
@@ -32,4 +25,5 @@ filegroup(
     name = "all-srcs",
     srcs = [":package-srcs"],
     tags = ["automanaged"],
+    visibility = ["//visibility:public"],
 )

vendor/k8s.io/kube-openapi/pkg/util/BUILD

@@ -15,7 +15,10 @@ filegroup(
 
 filegroup(
     name = "all-srcs",
-    srcs = [":package-srcs"],
+    srcs = [
+        ":package-srcs",
+        "//vendor/k8s.io/kube-openapi/pkg/util/proto:all-srcs",
+    ],
     tags = ["automanaged"],
     visibility = ["//visibility:public"],
 )

vendor/k8s.io/kube-openapi/pkg/util/proto/BUILD

+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "doc.go",
+        "document.go",
+        "openapi.go",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//vendor/github.com/googleapis/gnostic/OpenAPIv2:go_default_library",
+        "//vendor/gopkg.in/yaml.v2:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [
+        ":package-srcs",
+        "//vendor/k8s.io/kube-openapi/pkg/util/proto/testing:all-srcs",
+    ],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

vendor/k8s.io/kube-openapi/pkg/util/proto/doc.go

+/*
+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 proto is a collection of libraries for parsing and indexing the type definitions.
+// The openapi spec contains the object model definitions and extensions metadata.
+package proto

vendor/k8s.io/kube-openapi/pkg/util/proto/document.go

+/*
+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 proto
+
+import (
+	"fmt"
+	"strings"
+
+	openapi_v2 "github.com/googleapis/gnostic/OpenAPIv2"
+	yaml "gopkg.in/yaml.v2"
+)
+
+func newSchemaError(path *Path, format string, a ...interface{}) error {
+	err := fmt.Sprintf(format, a...)
+	if path.Len() == 0 {
+		return fmt.Errorf("SchemaError: %v", err)
+	}
+	return fmt.Errorf("SchemaError(%v): %v", path, err)
+}
+
+// VendorExtensionToMap converts openapi VendorExtension to a map.
+func VendorExtensionToMap(e []*openapi_v2.NamedAny) map[string]interface{} {
+	values := map[string]interface{}{}
+
+	for _, na := range e {
+		if na.GetName() == "" || na.GetValue() == nil {
+			continue
+		}
+		if na.GetValue().GetYaml() == "" {
+			continue
+		}
+		var value interface{}
+		err := yaml.Unmarshal([]byte(na.GetValue().GetYaml()), &value)
+		if err != nil {
+			continue
+		}
+
+		values[na.GetName()] = value
+	}
+
+	return values
+}
+
+// Definitions is an implementation of `Resources`. It looks for
+// resources in an openapi Schema.
+type Definitions struct {
+	models    map[string]Schema
+	resources map[string]string
+}
+
+var _ Resources = &Definitions{}
+
+// NewOpenAPIData creates a new `Resources` out of the openapi document.
+func NewOpenAPIData(doc *openapi_v2.Document, getIdFromSchema func(s *openapi_v2.Schema) string) (Resources, error) {
+	definitions := Definitions{
+		models:    map[string]Schema{},
+		resources: map[string]string{},
+	}
+
+	// Save the list of all models first. This will allow us to
+	// validate that we don't have any dangling reference.
+	for _, namedSchema := range doc.GetDefinitions().GetAdditionalProperties() {
+		definitions.models[namedSchema.GetName()] = nil
+	}
+
+	// Now, parse each model. We can validate that references exists.
+	for _, namedSchema := range doc.GetDefinitions().GetAdditionalProperties() {
+		path := NewPath(namedSchema.GetName())
+		schema, err := definitions.ParseSchema(namedSchema.GetValue(), &path)
+		if err != nil {
+			return nil, err
+		}
+		definitions.models[namedSchema.GetName()] = schema
+		id := getIdFromSchema(namedSchema.GetValue())
+		definitions.resources[id] = namedSchema.GetName()
+	}
+
+	return &definitions, nil
+}
+
+// We believe the schema is a reference, verify that and returns a new
+// Schema
+func (d *Definitions) parseReference(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	if len(s.GetProperties().GetAdditionalProperties()) > 0 {
+		return nil, newSchemaError(path, "unallowed embedded type definition")
+	}
+	if len(s.GetType().GetValue()) > 0 {
+		return nil, newSchemaError(path, "definition reference can't have a type")
+	}
+
+	if !strings.HasPrefix(s.GetXRef(), "#/definitions/") {
+		return nil, newSchemaError(path, "unallowed reference to non-definition %q", s.GetXRef())
+	}
+	reference := strings.TrimPrefix(s.GetXRef(), "#/definitions/")
+	if _, ok := d.models[reference]; !ok {
+		return nil, newSchemaError(path, "unknown model in reference: %q", reference)
+	}
+	return &Ref{
+		BaseSchema:  d.parseBaseSchema(s, path),
+		reference:   reference,
+		definitions: d,
+	}, nil
+}
+
+func (d *Definitions) parseBaseSchema(s *openapi_v2.Schema, path *Path) BaseSchema {
+	return BaseSchema{
+		Description: s.GetDescription(),
+		Extensions:  VendorExtensionToMap(s.GetVendorExtension()),
+		Path:        *path,
+	}
+}
+
+// We believe the schema is a map, verify and return a new schema
+func (d *Definitions) parseMap(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	if len(s.GetType().GetValue()) != 0 && s.GetType().GetValue()[0] != object {
+		return nil, newSchemaError(path, "invalid object type")
+	}
+	if s.GetAdditionalProperties().GetSchema() == nil {
+		return nil, newSchemaError(path, "invalid object doesn't have additional properties")
+	}
+	sub, err := d.ParseSchema(s.GetAdditionalProperties().GetSchema(), path)
+	if err != nil {
+		return nil, err
+	}
+	return &Map{
+		BaseSchema: d.parseBaseSchema(s, path),
+		SubType:    sub,
+	}, nil
+}
+
+func (d *Definitions) parsePrimitive(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	var t string
+	if len(s.GetType().GetValue()) > 1 {
+		return nil, newSchemaError(path, "primitive can't have more than 1 type")
+	}
+	if len(s.GetType().GetValue()) == 1 {
+		t = s.GetType().GetValue()[0]
+	}
+	switch t {
+	case String:
+	case Number:
+	case Integer:
+	case Boolean:
+	case "": // Some models are completely empty, and can be safely ignored.
+		// Do nothing
+	default:
+		return nil, newSchemaError(path, "Unknown primitive type: %q", t)
+	}
+	return &Primitive{
+		BaseSchema: d.parseBaseSchema(s, path),
+		Type:       t,
+		Format:     s.GetFormat(),
+	}, nil
+}
+
+func (d *Definitions) parseArray(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	if len(s.GetType().GetValue()) != 1 {
+		return nil, newSchemaError(path, "array should have exactly one type")
+	}
+	if s.GetType().GetValue()[0] != array {
+		return nil, newSchemaError(path, `array should have type "array"`)
+	}
+	if len(s.GetItems().GetSchema()) != 1 {
+		return nil, newSchemaError(path, "array should have exactly one sub-item")
+	}
+	sub, err := d.ParseSchema(s.GetItems().GetSchema()[0], path)
+	if err != nil {
+		return nil, err
+	}
+	return &Array{
+		BaseSchema: d.parseBaseSchema(s, path),
+		SubType:    sub,
+	}, nil
+}
+
+func (d *Definitions) parseKind(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	if len(s.GetType().GetValue()) != 0 && s.GetType().GetValue()[0] != object {
+		return nil, newSchemaError(path, "invalid object type")
+	}
+	if s.GetProperties() == nil {
+		return nil, newSchemaError(path, "object doesn't have properties")
+	}
+
+	fields := map[string]Schema{}
+
+	for _, namedSchema := range s.GetProperties().GetAdditionalProperties() {
+		var err error
+		path := path.FieldPath(namedSchema.GetName())
+		fields[namedSchema.GetName()], err = d.ParseSchema(namedSchema.GetValue(), &path)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return &Kind{
+		BaseSchema:     d.parseBaseSchema(s, path),
+		RequiredFields: s.GetRequired(),
+		Fields:         fields,
+	}, nil
+}
+
+// ParseSchema creates a walkable Schema from an openapi schema. While
+// this function is public, it doesn't leak through the interface.
+func (d *Definitions) ParseSchema(s *openapi_v2.Schema, path *Path) (Schema, error) {
+	if len(s.GetType().GetValue()) == 1 {
+		t := s.GetType().GetValue()[0]
+		switch t {
+		case object:
+			return d.parseMap(s, path)
+		case array:
+			return d.parseArray(s, path)
+		}
+
+	}
+	if s.GetXRef() != "" {
+		return d.parseReference(s, path)
+	}
+	if s.GetProperties() != nil {
+		return d.parseKind(s, path)
+	}
+	return d.parsePrimitive(s, path)
+}
+
+// LookupResource is public through the interface of Resources. It
+// returns a visitable schema from the given group-version-kind.
+func (d *Definitions) LookupResource(gvk string) Schema {
+	modelName, found := d.resources[gvk]
+	if !found {
+		return nil
+	}
+	model, found := d.models[modelName]
+	if !found {
+		return nil
+	}
+	return model
+}
+
+type Ref struct {
+	BaseSchema
+
+	reference   string
+	definitions *Definitions
+}
+
+var _ Reference = &Ref{}
+
+func (r *Ref) Reference() string {
+	return r.reference
+}
+
+func (r *Ref) SubSchema() Schema {
+	return r.definitions.models[r.reference]
+}
+
+func (r *Ref) Accept(v SchemaVisitor) {
+	v.VisitReference(r)
+}
+
+func (r *Ref) GetName() string {
+	return fmt.Sprintf("Reference to %q", r.reference)
+}

vendor/k8s.io/kube-openapi/pkg/util/proto/openapi.go

+/*
+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 proto
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Defines openapi types.
+const (
+	Integer = "integer"
+	Number  = "number"
+	String  = "string"
+	Boolean = "boolean"
+
+	// These types are private as they should never leak, and are
+	// represented by actual structs.
+	array  = "array"
+	object = "object"
+)
+
+// Resources interface describe a resources provider, that can give you
+// resource based on group-version-kind.
+type Resources interface {
+	LookupResource(string) Schema
+}
+
+// SchemaVisitor is an interface that you need to implement if you want
+// to "visit" an openapi schema. A dispatch on the Schema type will call
+// the appropriate function based on its actual type:
+// - Array is a list of one and only one given subtype
+// - Map is a map of string to one and only one given subtype
+// - Primitive can be string, integer, number and boolean.
+// - Kind is an object with specific fields mapping to specific types.
+// - Reference is a link to another definition.
+type SchemaVisitor interface {
+	VisitArray(*Array)
+	VisitMap(*Map)
+	VisitPrimitive(*Primitive)
+	VisitKind(*Kind)
+	VisitReference(Reference)
+}
+
+// Schema is the base definition of an openapi type.
+type Schema interface {
+	// Giving a visitor here will let you visit the actual type.
+	Accept(SchemaVisitor)
+
+	// Pretty print the name of the type.
+	GetName() string
+	// Describes how to access this field.
+	GetPath() *Path
+	// Describes the field.
+	GetDescription() string
+	// Returns type extensions.
+	GetExtensions() map[string]interface{}
+}
+
+// Path helps us keep track of type paths
+type Path struct {
+	parent *Path
+	key    string
+}
+
+func NewPath(key string) Path {
+	return Path{key: key}
+}
+
+func (p *Path) Get() []string {
+	if p == nil {
+		return []string{}
+	}
+	if p.key == "" {
+		return p.parent.Get()
+	}
+	return append(p.parent.Get(), p.key)
+}
+
+func (p *Path) Len() int {
+	return len(p.Get())
+}
+
+func (p *Path) String() string {
+	return strings.Join(p.Get(), "")
+}
+
+// ArrayPath appends an array index and creates a new path
+func (p *Path) ArrayPath(i int) Path {
+	return Path{
+		parent: p,
+		key:    fmt.Sprintf("[%d]", i),
+	}
+}
+
+// FieldPath appends a field name and creates a new path
+func (p *Path) FieldPath(field string) Path {
+	return Path{
+		parent: p,
+		key:    fmt.Sprintf(".%s", field),
+	}
+}
+
+// BaseSchema holds data used by each types of schema.
+type BaseSchema struct {
+	Description string
+	Extensions  map[string]interface{}
+
+	Path Path
+}
+
+func (b *BaseSchema) GetDescription() string {
+	return b.Description
+}
+
+func (b *BaseSchema) GetExtensions() map[string]interface{} {
+	return b.Extensions
+}
+
+func (b *BaseSchema) GetPath() *Path {
+	return &b.Path
+}
+
+// Array must have all its element of the same `SubType`.
+type Array struct {
+	BaseSchema
+
+	SubType Schema
+}
+
+var _ Schema = &Array{}
+
+func (a *Array) Accept(v SchemaVisitor) {
+	v.VisitArray(a)
+}
+
+func (a *Array) GetName() string {
+	return fmt.Sprintf("Array of %s", a.SubType.GetName())
+}
+
+// Kind is a complex object. It can have multiple different
+// subtypes for each field, as defined in the `Fields` field. Mandatory
+// fields are listed in `RequiredFields`. The key of the object is
+// always of type `string`.
+type Kind struct {
+	BaseSchema
+
+	// Lists names of required fields.
+	RequiredFields []string
+	// Maps field names to types.
+	Fields map[string]Schema
+}
+
+var _ Schema = &Kind{}
+
+func (k *Kind) Accept(v SchemaVisitor) {
+	v.VisitKind(k)
+}
+
+func (k *Kind) GetName() string {
+	properties := []string{}
+	for key := range k.Fields {
+		properties = append(properties, key)
+	}
+	return fmt.Sprintf("Kind(%v)", properties)
+}
+
+// Map is an object who values must all be of the same `SubType`.
+// The key of the object is always of type `string`.
+type Map struct {
+	BaseSchema
+
+	SubType Schema
+}
+
+var _ Schema = &Map{}
+
+func (m *Map) Accept(v SchemaVisitor) {
+	v.VisitMap(m)
+}
+
+func (m *Map) GetName() string {
+	return fmt.Sprintf("Map of %s", m.SubType.GetName())
+}
+
+// Primitive is a literal. There can be multiple types of primitives,
+// and this subtype can be visited through the `subType` field.
+type Primitive struct {
+	BaseSchema
+
+	// Type of a primitive must be one of: integer, number, string, boolean.
+	Type   string
+	Format string
+}
+
+var _ Schema = &Primitive{}
+
+func (p *Primitive) Accept(v SchemaVisitor) {
+	v.VisitPrimitive(p)
+}
+
+func (p *Primitive) GetName() string {
+	if p.Format == "" {
+		return p.Type
+	}
+	return fmt.Sprintf("%s (%s)", p.Type, p.Format)
+}
+
+// Reference implementation depends on the type of document.
+type Reference interface {
+	Schema
+
+	Reference() string
+	SubSchema() Schema
+}

vendor/k8s.io/kube-openapi/pkg/util/proto/testing/BUILD

+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "gvk.go",
+        "openapi.go",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//vendor/github.com/googleapis/gnostic/OpenAPIv2:go_default_library",
+        "//vendor/github.com/googleapis/gnostic/compiler:go_default_library",
+        "//vendor/gopkg.in/yaml.v2:go_default_library",
+        "//vendor/k8s.io/kube-openapi/pkg/util/proto:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

vendor/k8s.io/kube-openapi/pkg/util/proto/testing/gvk.go

+/*
+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 testing
+
+import (
+	"github.com/googleapis/gnostic/OpenAPIv2"
+	"k8s.io/kube-openapi/pkg/util/proto"
+)
+
+// tesingExtensionKey is the key used only for testing.
+// We use some kubernetes openapi spec for testing that has this key.
+const tesingExtensionKey = "x-kubernetes-group-version-kind"
+
+// Get and parse GroupVersionKind from the extension. Returns empty if it doesn't have one.
+func ParseGroupVersionKind(s *openapi_v2.Schema) string {
+	extensionMap := proto.VendorExtensionToMap(s.GetVendorExtension())
+
+	// Get the extensions
+	gvkExtension, ok := extensionMap[tesingExtensionKey]
+	if !ok {
+		return ""
+	}
+
+	// gvk extension must be a list of 1 element.
+	gvkList, ok := gvkExtension.([]interface{})
+	if !ok {
+		return ""
+	}
+	if len(gvkList) != 1 {
+		return ""
+
+	}
+	gvk := gvkList[0]
+
+	// gvk extension list must be a map with group, version, and
+	// kind fields
+	gvkMap, ok := gvk.(map[interface{}]interface{})
+	if !ok {
+		return ""
+	}
+	group, ok := gvkMap["group"].(string)
+	if !ok {
+		return ""
+	}
+	version, ok := gvkMap["version"].(string)
+	if !ok {
+		return ""
+	}
+	kind, ok := gvkMap["kind"].(string)
+	if !ok {
+		return ""
+	}
+
+	return GvkString(group, version, kind)
+}
+
+func GvkString(group, version, kind string) string {
+	return group + "/" + version + ", Kind=" + kind
+}
+

vendor/k8s.io/kube-openapi/pkg/util/proto/testing/openapi.go

+/*
+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 testing
+
+import (
+	"io/ioutil"
+	"os"
+	"sync"
+
+	yaml "gopkg.in/yaml.v2"
+
+	"github.com/googleapis/gnostic/OpenAPIv2"
+	"github.com/googleapis/gnostic/compiler"
+)
+
+// Fake opens and returns a openapi swagger from a file Path. It will
+// parse only once and then return the same copy everytime.
+type Fake struct {
+	Path string
+
+	once     sync.Once
+	document *openapi_v2.Document
+	err      error
+}
+
+// OpenAPISchema returns the openapi document and a potential error.
+func (f *Fake) OpenAPISchema() (*openapi_v2.Document, error) {
+	f.once.Do(func() {
+		_, err := os.Stat(f.Path)
+		if err != nil {
+			f.err = err
+			return
+		}
+		spec, err := ioutil.ReadFile(f.Path)
+		if err != nil {
+			f.err = err
+			return
+		}
+		var info yaml.MapSlice
+		err = yaml.Unmarshal(spec, &info)
+		if err != nil {
+			f.err = err
+			return
+		}
+		f.document, f.err = openapi_v2.NewDocument(info, compiler.NewContext("$root", nil))
+	})
+	return f.document, f.err
+}
+
+// FakeClient implements a dummy OpenAPISchemaInterface that uses the
+// fake OpenAPI schema given as a parameter, and count the number of
+// call to the function.
+type FakeClient struct {
+	Calls int
+	Err   error
+
+	fake *Fake
+}
+
+// NewFakeClient creates a new FakeClient from the given Fake.
+func NewFakeClient(f *Fake) *FakeClient {
+	return &FakeClient{fake: f}
+}
+
+// OpenAPISchema returns a OpenAPI Document as returned by the fake, but
+// it also counts the number of calls.
+func (f *FakeClient) OpenAPISchema() (*openapi_v2.Document, error) {
+	f.Calls = f.Calls + 1
+
+	if f.Err != nil {
+		return nil, f.Err
+	}
+
+	return f.fake.OpenAPISchema()
+}