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schema.go
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schema.go
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// Copyright 2018 Istio 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 resource
import (
"fmt"
"reflect"
)
// injectable function for overriding proto.MessageType, for testing purposes.
type messageTypeFn func(name string) reflect.Type
// Schema contains metadata about configuration resources.
type Schema struct {
byCollection map[string]Info
messageTypeFn messageTypeFn
}
// SchemaBuilder is a buidler for the schema type.
type SchemaBuilder struct {
schema *Schema
}
// NewSchemaBuilder returns a new instance of SchemaBuilder.
func NewSchemaBuilder() *SchemaBuilder {
return newSchemaBuilder(getProtoMessageType)
}
// newSchemaBuilder returns a new instance of SchemaBuilder.
func newSchemaBuilder(messageTypeFn messageTypeFn) *SchemaBuilder {
s := &Schema{
byCollection: make(map[string]Info),
messageTypeFn: messageTypeFn,
}
return &SchemaBuilder{
schema: s,
}
}
// Register a proto into the schema.
func (b *SchemaBuilder) Register(rawCollection, rawTypeURL string) Info {
if _, found := b.schema.byCollection[rawCollection]; found {
panic(fmt.Sprintf("schema.Register: collection is registered multiple times: %q", rawCollection))
}
typeURL, err := newTypeURL(rawTypeURL)
if err != nil {
panic(err)
}
goType := b.schema.messageTypeFn(typeURL.MessageName())
if goType == nil {
panic(fmt.Sprintf("schema.Register: Proto type not found: %q", typeURL.MessageName()))
}
info := Info{
Collection: newCollection(rawCollection),
goType: goType,
TypeURL: typeURL,
}
b.RegisterInfo(info)
return info
}
// Register a proto into the schema.
func (b *SchemaBuilder) RegisterInfo(info Info) *SchemaBuilder {
b.schema.byCollection[info.Collection.String()] = info
return b
}
// Register all protos in the given Schema
func (b *SchemaBuilder) RegisterSchema(schema *Schema) *SchemaBuilder {
for _, info := range schema.All() {
b.RegisterInfo(info)
}
return b
}
// Unregister all protos in the given Schema
func (b *SchemaBuilder) UnregisterSchema(schema *Schema) *SchemaBuilder {
for _, info := range schema.All() {
b.UnregisterInfo(info)
}
return b
}
// Unregister a proto from the schema.
func (b *SchemaBuilder) UnregisterInfo(info Info) *SchemaBuilder {
delete(b.schema.byCollection, info.Collection.String())
return b
}
// Build a new schema from this SchemaBuilder.
func (b *SchemaBuilder) Build() *Schema {
s := b.schema
// Avoid modify after Build.
b.schema = nil
return s
}
// Lookup looks up a resource.Info by its collection.
func (s *Schema) Lookup(collection string) (Info, bool) {
i, ok := s.byCollection[collection]
return i, ok
}
// Get looks up a resource.Info by its collection. Panics if it is not found.
func (s *Schema) Get(collection string) Info {
i, ok := s.Lookup(collection)
if !ok {
panic(fmt.Sprintf("schema.Get: matching entry not found for collection: %q", collection))
}
return i
}
// All returns all known info objects
func (s *Schema) All() []Info {
result := make([]Info, 0, len(s.byCollection))
for _, info := range s.byCollection {
result = append(result, info)
}
return result
}
// Collections returns all known collections.
func (s *Schema) Collections() []string {
result := make([]string, 0, len(s.byCollection))
for _, info := range s.byCollection {
result = append(result, info.Collection.string)
}
return result
}