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@@ -20,3 +20,7 @@ report.json | |
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| # Images | ||
| *.png | ||
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| # VSCode | ||
| *.code-workspace | ||
| .vscode/* | ||
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| /** | ||
| * Copyright (c) 2022 Comcast Cable Communications Management, LLC | ||
| * | ||
| * 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. | ||
| * | ||
| */ | ||
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| package wrp | ||
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| import ( | ||
| "errors" | ||
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| "go.uber.org/multierr" | ||
| ) | ||
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| var ( | ||
| ErrInvalidTypeValidator = errors.New("invalid TypeValidator") | ||
| ErrInvalidValidator = errors.New("invalid WRP message type validator") | ||
| ErrInvalidMsgType = errors.New("invalid WRP message type") | ||
| ) | ||
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| // AlwaysInvalid doesn't validate anything about the message and always returns an error. | ||
| var AlwaysInvalid ValidatorFunc = func(m Message) error { return ErrInvalidMsgType } | ||
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| // AlwaysValid doesn't validate anything about the message and always returns nil. | ||
| var AlwaysValid ValidatorFunc = func(msg Message) error { return nil } | ||
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| // Validator is a WRP validator that allows access to the Validate function. | ||
| type Validator interface { | ||
| Validate(m Message) error | ||
| } | ||
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| // Validators is a WRP validator that ensures messages are valid based on | ||
| // message type and each validator in the list. | ||
| type Validators []Validator | ||
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| // Validate runs messages through each validator in the validators list. | ||
| // It returns as soon as the message is considered invalid, otherwise returns nil if valid. | ||
| func (vs Validators) Validate(m Message) error { | ||
| var err error | ||
| for _, v := range vs { | ||
| if v != nil { | ||
| err = multierr.Append(err, v.Validate(m)) | ||
| } | ||
| } | ||
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| return err | ||
| } | ||
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| // ValidatorFunc is a WRP validator that takes messages and validates them | ||
| // against functions. | ||
| type ValidatorFunc func(Message) error | ||
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| // Validate executes its own ValidatorFunc receiver and returns the result. | ||
| func (vf ValidatorFunc) Validate(m Message) error { | ||
| return vf(m) | ||
| } | ||
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| // TypeValidator is a WRP validator that validates based on message type | ||
| // or using the defaultValidator if message type is unfound. | ||
| type TypeValidator struct { | ||
| m map[MessageType]Validator | ||
| defaultValidator Validator | ||
| } | ||
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| // Validate validates messages based on message type or using the defaultValidator | ||
| // if message type is unfound. | ||
| func (m TypeValidator) Validate(msg Message) error { | ||
| vs := m.m[msg.MessageType()] | ||
| if vs == nil { | ||
| return m.defaultValidator.Validate(msg) | ||
| } | ||
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| return vs.Validate(msg) | ||
| } | ||
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| // NewTypeValidator is a TypeValidator factory. | ||
| func NewTypeValidator(m map[MessageType]Validator, defaultValidator Validator) (TypeValidator, error) { | ||
| if m == nil { | ||
| return TypeValidator{}, ErrInvalidValidator | ||
| } | ||
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| if defaultValidator == nil { | ||
| defaultValidator = AlwaysInvalid | ||
| } | ||
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| return TypeValidator{ | ||
| m: m, | ||
| defaultValidator: defaultValidator, | ||
| }, nil | ||
| } |
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