/
message.go
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/
message.go
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// Copyright 2023-2024 Buf Technologies, Inc.
//
// 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 evaluator
import (
"github.com/bufbuild/protovalidate-go/internal/errors"
"google.golang.org/protobuf/reflect/protoreflect"
)
// message performs validation on a protoreflect.Message.
type message struct {
// Err stores if there was a compilation error constructing this evaluator.
// It is cached here so that it can be stored in the registry's lookup table.
Err error
// evaluators are the individual evaluators that are applied to a message.
evaluators messageEvaluators
}
func (m *message) Evaluate(val protoreflect.Value, failFast bool) error {
return m.EvaluateMessage(val.Message(), failFast)
}
func (m *message) EvaluateMessage(msg protoreflect.Message, failFast bool) error {
if m.Err != nil {
return m.Err
}
return m.evaluators.EvaluateMessage(msg, failFast)
}
func (m *message) Tautology() bool {
return m.Err == nil && m.evaluators.Tautology()
}
func (m *message) Append(eval MessageEvaluator) {
if eval != nil && !eval.Tautology() {
m.evaluators = append(m.evaluators, eval)
}
}
// unknownMessage is a MessageEvaluator for an unknown descriptor. This is
// returned only if lazy-building of evaluators has been disabled and an unknown
// descriptor is encountered.
type unknownMessage struct {
desc protoreflect.MessageDescriptor
}
func (u unknownMessage) Err() error {
return errors.NewCompilationErrorf(
"no evaluator available for %s",
u.desc.FullName())
}
func (u unknownMessage) Tautology() bool { return false }
func (u unknownMessage) Evaluate(_ protoreflect.Value, _ bool) error {
return u.Err()
}
func (u unknownMessage) EvaluateMessage(_ protoreflect.Message, _ bool) error {
return u.Err()
}
var _ MessageEvaluator = (*message)(nil)