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config.go
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config.go
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// Copyright 2022-2024 The Parca Authors
// 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 config
import (
"errors"
"fmt"
"os"
"github.com/prometheus/prometheus/model/relabel"
"gopkg.in/yaml.v3"
)
var ErrEmptyConfig = errors.New("empty config")
// Config holds all the configuration information for Parca Agent.
type Config struct {
RelabelConfigs []*relabel.Config `yaml:"relabel_configs,omitempty"`
}
func (c Config) String() string {
b, err := yaml.Marshal(c)
if err != nil {
return fmt.Sprintf("<error creating config string: %s>", err)
}
return string(b)
}
// Load parses the YAML input s into a Config.
func Load(b []byte) (*Config, error) {
if len(b) == 0 {
return nil, ErrEmptyConfig
}
// TODO: Sanitize the input labels if it becomes a problem for the user.
// https://github.com/prometheus/prometheus/blob/1bfb3ed062e99bd3c74e05d9ff9a7fa4e30bbe21/util/strutil/strconv.go#L51
cfg := &Config{}
if err := yaml.Unmarshal(b, cfg); err != nil {
return nil, fmt.Errorf("unmarshaling YAML: %w", err)
}
return cfg, nil
}
// LoadFile parses the given YAML file into a Config.
func LoadFile(filename string) (*Config, error) {
content, err := os.ReadFile(filename)
if err != nil {
return nil, err
}
cfg, err := Load(content)
if err != nil {
return nil, fmt.Errorf("parsing YAML file %s: %w", filename, err)
}
return cfg, nil
}