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env_var.go
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env_var.go
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// Copyright Splunk, 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 properties
import (
"fmt"
"github.com/alecthomas/participle/v2"
"github.com/alecthomas/participle/v2/lexer"
)
// SPLUNK_DISCOVERY_RECEIVERS_receiver_x2d_type_x2f_receiver_x2d_name_CONFIG_field_x3a_x3a_subfield=val
// SPLUNK_DISCOVERY_EXTENSIONS_observer_x2d_type_x2f_observer_x2d_name_CONFIG_field_x3a_x3a_subfield=val
var envVarLex = lexer.MustSimple([]lexer.SimpleRule{
{Name: "Underscore", Pattern: `_`},
{Name: "String", Pattern: `[^_]+`},
})
var envVarParser = participle.MustBuild[EnvVarProperty](
participle.Lexer(envVarLex),
participle.UseLookahead(participle.MaxLookahead),
)
type EnvVarProperty struct {
ComponentType string `parser:"'SPLUNK' Underscore 'DISCOVERY' Underscore @('RECEIVERS' | 'EXTENSIONS') Underscore"`
Component EnvVarComponentID `parser:"@@"`
Type string `parser:"Underscore @('CONFIG'|'ENABLED')"`
Key string `parser:"(Underscore @(String|Underscore)+)*"`
Val string
}
type EnvVarComponentID struct {
Type string `parser:"@~(Underscore (?= ('CONFIG'|'ENABLED')))+"`
// _x2f_ -> '/'
Name string `parser:"(Underscore 'x2f' Underscore @(~(?= Underscore (?= ('CONFIG'|'ENABLED')))+|''))?"`
}
func NewEnvVarProperty(property, val string) (*EnvVarProperty, error) {
p, err := envVarParser.ParseString("SPLUNK_DISCOVERY", property)
if err != nil {
return nil, fmt.Errorf("invalid property env var (parsing error): %w", err)
}
p.Val = val
return p, nil
}