mirror of https://github.com/status-im/consul.git
106 lines
2.6 KiB
Go
106 lines
2.6 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package resource
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import (
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"fmt"
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"github.com/hashicorp/go-bexpr"
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"github.com/hashicorp/consul/proto-public/pbresource"
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)
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// FilterResourcesByMetadata will use the provided go-bexpr based filter to
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// retain matching items from the provided slice.
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//
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// The only variables usable in the expressions are the metadata keys prefixed
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// by "metadata."
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//
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// If no filter is provided, then this does nothing and returns the input.
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func FilterResourcesByMetadata(resources []*pbresource.Resource, filter string) ([]*pbresource.Resource, error) {
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if filter == "" || len(resources) == 0 {
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return resources, nil
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}
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eval, err := createMetadataFilterEvaluator(filter)
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if err != nil {
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return nil, err
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}
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filtered := make([]*pbresource.Resource, 0, len(resources))
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for _, res := range resources {
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vars := &metadataFilterFieldDetails{
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Meta: res.Metadata,
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}
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match, err := eval.Evaluate(vars)
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if err != nil {
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return nil, err
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}
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if match {
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filtered = append(filtered, res)
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}
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}
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if len(filtered) == 0 {
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return nil, nil
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}
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return filtered, nil
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}
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// FilterMatchesResourceMetadata will use the provided go-bexpr based filter to
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// determine if the provided resource matches.
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//
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// The only variables usable in the expressions are the metadata keys prefixed
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// by "metadata."
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//
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// If no filter is provided, then this returns true.
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func FilterMatchesResourceMetadata(res *pbresource.Resource, filter string) (bool, error) {
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if res == nil {
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return false, nil
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} else if filter == "" {
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return true, nil
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}
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eval, err := createMetadataFilterEvaluator(filter)
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if err != nil {
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return false, err
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}
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vars := &metadataFilterFieldDetails{
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Meta: res.Metadata,
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}
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match, err := eval.Evaluate(vars)
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if err != nil {
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return false, err
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}
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return match, nil
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}
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// ValidateMetadataFilter will validate that the provided filter is going to be
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// a valid input to the FilterResourcesByMetadata function.
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//
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// This is best called from a Validate hook.
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func ValidateMetadataFilter(filter string) error {
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if filter == "" {
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return nil
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}
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_, err := createMetadataFilterEvaluator(filter)
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return err
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}
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func createMetadataFilterEvaluator(filter string) (*bexpr.Evaluator, error) {
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sampleVars := &metadataFilterFieldDetails{
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Meta: make(map[string]string),
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}
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eval, err := bexpr.CreateEvaluatorForType(filter, nil, sampleVars)
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if err != nil {
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return nil, fmt.Errorf("filter %q is invalid: %w", filter, err)
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}
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return eval, nil
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}
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type metadataFilterFieldDetails struct {
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Meta map[string]string `bexpr:"metadata"`
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}
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