mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
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131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
/**
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# Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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**/
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package constraints
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import (
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"fmt"
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"strings"
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"golang.org/x/mod/semver"
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)
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// Property represents a property that is used to check requirements
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//
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//go:generate moq -stub -out property_mock.go . Property
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type Property interface {
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Name() string
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Value() (string, error)
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String() string
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CompareTo(string) (int, error)
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Validate(string) error
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}
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// NewStringProperty creates a string property based on the name-value pair
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func NewStringProperty(name string, value string) Property {
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p := stringProperty{
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name: name,
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value: value,
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}
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return p
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}
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// NewVersionProperty creates a property representing a semantic version based on the name-value pair
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func NewVersionProperty(name string, value string) Property {
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p := versionProperty{
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stringProperty: stringProperty{
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name: name,
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value: value,
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},
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}
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return p
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}
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// stringProperty represents a property that is used to check requirements
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type stringProperty struct {
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name string
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value string
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}
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type versionProperty struct {
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stringProperty
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}
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// Name returns a stringProperty's name
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func (p stringProperty) Name() string {
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return p.name
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}
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// Value returns a stringProperty's value or an error if this cannot be determined
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func (p stringProperty) Value() (string, error) {
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return p.value, nil
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}
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// CompareTo compares two strings to each other
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func (p stringProperty) CompareTo(other string) (int, error) {
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value := p.value
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if value < other {
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return -1, nil
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}
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if value > other {
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return 1, nil
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}
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return 0, nil
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}
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// Validate returns nil for all input strings
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func (p stringProperty) Validate(string) error {
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return nil
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}
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// String returns the string representation of the name value combination
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func (p stringProperty) String() string {
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v, err := p.Value()
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if err != nil {
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return fmt.Sprintf("invalid %v: %v", p.name, err)
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}
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return fmt.Sprintf("%v=%v", p.name, v)
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}
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// CompareTo compares two versions to each other as semantic versions
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func (p versionProperty) CompareTo(other string) (int, error) {
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if err := p.Validate(other); err != nil {
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return 0, fmt.Errorf("invailid value for %v: %v", p.name, err)
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}
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vValue := ensurePrefix(p.value, "v")
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vOther := ensurePrefix(other, "v")
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return semver.Compare(vValue, vOther), nil
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}
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// Validate checks whether the supplied value is a valid semantic version
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func (p versionProperty) Validate(value string) error {
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if !semver.IsValid(ensurePrefix(value, "v")) {
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return fmt.Errorf("invailid value %v; expected a valid version string", value)
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}
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return nil
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}
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func ensurePrefix(s string, prefix string) string {
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return prefix + strings.TrimPrefix(s, prefix)
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}
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