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config.go
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config.go
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package config
import (
"context"
"strconv"
"time"
"github.com/antongulenko/golib"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type cacheEntry struct {
value string
updateTimestamp time.Time
}
type Config struct {
req client.Client
logger *log.Entry
namespace string
configMapName string
cache map[string]cacheEntry
invalidatePeriod time.Duration
loggedMissingKeys map[string]bool
}
func NewConfig(client client.Client, namespace, configMapName string) *Config {
conf := &Config{
req: client,
logger: newConfigLogger(namespace, configMapName),
namespace: namespace,
configMapName: configMapName,
loggedMissingKeys: make(map[string]bool),
}
conf.logger.Info("Using direct ConfigMap access")
return conf
}
func NewConfigWithCache(client client.Client, namespace, configMapName string, invalidatePeriod time.Duration) *Config {
conf := &Config{
req: client,
logger: newConfigLogger(namespace, configMapName),
namespace: namespace,
configMapName: configMapName,
invalidatePeriod: invalidatePeriod,
cache: make(map[string]cacheEntry),
loggedMissingKeys: make(map[string]bool),
}
conf.logger.Infof("Using cached ConfigMap access (caching period %v)", invalidatePeriod)
return conf
}
func newConfigLogger(namespace, configMapName string) *log.Entry {
return log.WithField("config-map", configMapName).WithField("namespace", namespace)
}
func (config *Config) loadConfigMap() (*corev1.ConfigMap, error) {
configMap := &corev1.ConfigMap{}
err := config.req.Get(context.TODO(), types.NamespacedName{
Name: config.configMapName,
Namespace: config.namespace,
}, configMap)
return configMap, err
}
func (config *Config) Validate() error {
_, err := config.loadConfigMap()
return err
}
func (config *Config) getStringParam(key string) (string, bool, error) {
if config.cache != nil {
if value, ok := config.cache[key]; ok {
if time.Now().Sub(value.updateTimestamp) < config.invalidatePeriod {
return value.value, true, nil
}
}
}
configMap, err := config.loadConfigMap()
if err != nil {
return "", false, err
}
if value, ok := configMap.Data[key]; ok {
if config.cache != nil {
config.cache[key] = cacheEntry{value, time.Now()}
}
return value, true, nil
}
return "", false, nil
}
func (config *Config) getParam(key string, defaultValue interface{}, parseValue func(value string) (interface{}, error)) interface{} {
strValue, found, err := config.getStringParam(key)
if err != nil {
config.logger.Warnf("Failed to load config value for key '%v', using default value '%v'. Error: %v", key, defaultValue, err)
} else if !found {
if !config.loggedMissingKeys[key] {
config.logger.Warnf("Missing config value for key '%v', using default value: %v", key, defaultValue)
config.loggedMissingKeys[key] = true
}
} else {
if result, err := parseValue(strValue); err != nil {
config.logger.Warnf("Failed to parse config value for key '%v' = '%v', using default value '%v'. Error: %v", key, strValue, defaultValue, err)
} else {
return result
}
}
return defaultValue
}
func (config *Config) GetParameterMap() (map[string]string, error) {
conf, err := config.loadConfigMap()
if err != nil {
return nil, err
}
return conf.Data, nil
}
func (config *Config) GetStringParam(key string, defaultValue string) string {
return config.getParam(key, defaultValue, func(strValue string) (interface{}, error) {
return strValue, nil
}).(string)
}
func (config *Config) GetIntParam(key string, defaultValue int) int {
return config.getParam(key, defaultValue, func(strValue string) (interface{}, error) {
return strconv.Atoi(strValue)
}).(int)
}
func (config *Config) GetFloatParam(key string, defaultValue float64) float64 {
return config.getParam(key, defaultValue, func(strVal string) (interface{}, error) {
return strconv.ParseFloat(strVal, 64)
}).(float64)
}
func (config *Config) GetDurationParam(key string, defaultValue time.Duration) time.Duration {
return config.getParam(key, defaultValue, func(strVal string) (interface{}, error) {
return time.ParseDuration(strVal)
}).(time.Duration)
}
func (config *Config) GetBoolParam(key string, defaultValue bool) bool {
return config.getParam(key, defaultValue, func(strVal string) (interface{}, error) {
return strconv.ParseBool(strVal)
}).(bool)
}
func (config *Config) GetStringMapParam(key string, defaultValue map[string]string) map[string]string {
return config.getParam(key, defaultValue, func(strVal string) (interface{}, error) {
res := golib.ParseMap(strVal)
return res, nil
}).(map[string]string)
}
func (config *Config) GetStringSliceParam(key string, defaultValue []string) []string {
return config.getParam(key, defaultValue, func(strVal string) (interface{}, error) {
res := golib.ParseSlice(strVal)
return res, nil
}).([]string)
}