/
config.go
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/
config.go
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/*
* Copyright 2021 OpsMx, 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 main
import (
"os"
"gopkg.in/yaml.v3"
)
const (
defaultCACertPath = "/app/config/ca.pem"
defaultUserconfigPath = "/app/config/services.yaml"
defaultAuthTokenPath = "/app/secrets/authtoken"
defaultDialMaxRetries = 10
defaultDialRetryTime = 10
)
// agentConfig holds all the configuration for the agent. The
// configuration file is loaded from disk first, and then any
// environment variables are applied.
type agentConfig struct {
ControllerHostname string `json:"controllerHostname,omitempty" yaml:"controllerHostname,omitempty"`
InsecureControllerConnection bool `json:"insecureControllerConnection,omitempty" yaml:"insecureControllerConnection,omitempty"`
CACertFile string `json:"caCertFile,omitempty" yaml:"caCertFile,omitempty"`
CACert64 string `json:"caCert64,omitempty" yaml:"caCert64,omitempty"`
AuthTokenFile string `json:"authTokenFile,omitempty" yaml:"authTokenFile,omitempty"`
ServicesConfigFile string `json:"servicesConfigFile,omitempty" yaml:"servicesConfigFile,omitempty"`
DialMaxRetries int `json:"dialMaxRetries,omitempty" yaml:"dialMaxRetries,omitempty"`
DialRetryTime int `json:"dialRetryTime,omitempty" yaml:"dialRetryTime,omitempty"`
PrometheusListenPort uint16 `json:"prometheusListenPort,omitempty" yaml:"prometheusListenPort,omitempty"`
}
func (c *agentConfig) applyDefaults() {
if len(c.ControllerHostname) == 0 {
c.ControllerHostname = "agent-controller:9001"
}
if len(c.CACertFile) == 0 {
c.CACertFile = defaultCACertPath
}
if len(c.AuthTokenFile) == 0 {
c.AuthTokenFile = defaultAuthTokenPath
}
if len(c.ServicesConfigFile) == 0 {
c.ServicesConfigFile = defaultUserconfigPath
}
if c.DialMaxRetries == 0 {
c.DialMaxRetries = defaultDialMaxRetries
}
if c.DialRetryTime == 0 {
c.DialRetryTime = defaultDialRetryTime
}
if c.PrometheusListenPort == 0 {
c.PrometheusListenPort = 9102
}
}
// loadConfig will load YAML configuration from the provided filename, and then apply
// environment variables to override some subset of available options.
func loadConfig(filename string) (*agentConfig, error) {
buf, err := os.ReadFile(filename)
if err != nil {
return nil, err
}
config := &agentConfig{}
err = yaml.Unmarshal(buf, config)
if err != nil {
return nil, err
}
config.applyDefaults()
return config, nil
}