blob: 9c36241ba6d30a679d7098da2cbd42d37f378c9d [file] [log] [blame]
/*
* Copyright 2018-present Open Networking Foundation
* 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 provides dynamic logging configuration for specific Voltha component with loglevel lookup
// from etcd kvstore implemented using Backend.
// Any Voltha component can start utilizing dynamic logging by starting goroutine of StartLogLevelConfigProcessing after
// starting kvClient for the component.
package config
import (
"context"
"crypto/md5"
"encoding/json"
"errors"
"github.com/opencord/voltha-lib-go/v3/pkg/log"
"os"
"strings"
)
const (
defaultLogLevelKey = "default" // kvstore key containing default loglevel
globalConfigRootNode = "global" // Root Node in kvstore containing global config
initialGlobalDefaultLogLevelValue = "WARN" // Hard-coded Global Default loglevel pushed at PoD startup
)
// ComponentLogController represents a Configuration for Logging Config of specific Voltha component type
// It stores ComponentConfig and GlobalConfig of loglevel config of specific Voltha component type
// For example,ComponentLogController instance will be created for rw-core component
type ComponentLogController struct {
ComponentName string
componentNameConfig *ComponentConfig
GlobalConfig *ComponentConfig
configManager *ConfigManager
logHash [16]byte
initialLogLevel string // Initial default log level set by helm chart
}
func NewComponentLogController(cm *ConfigManager) (*ComponentLogController, error) {
logger.Debug("creating-new-component-log-controller")
componentName := os.Getenv("COMPONENT_NAME")
if componentName == "" {
return nil, errors.New("Unable to retrieve PoD Component Name from Runtime env")
}
var defaultLogLevel string
var err error
// Retrieve and save default log level; used for fallback if all loglevel config is cleared in etcd
if defaultLogLevel, err = log.LogLevelToString(log.GetDefaultLogLevel()); err != nil {
defaultLogLevel = "DEBUG"
}
return &ComponentLogController{
ComponentName: componentName,
componentNameConfig: nil,
GlobalConfig: nil,
configManager: cm,
initialLogLevel: defaultLogLevel,
}, nil
}
// StartLogLevelConfigProcessing initialize component config and global config
// Then, it persists initial default Loglevels into Config Store before
// starting the loading and processing of all Log Configuration
func StartLogLevelConfigProcessing(cm *ConfigManager, ctx context.Context) {
cc, err := NewComponentLogController(cm)
if err != nil {
logger.Errorw("unable-to-construct-component-log-controller-instance-for-log-config-monitoring", log.Fields{"error": err})
return
}
cc.GlobalConfig = cm.InitComponentConfig(globalConfigRootNode, ConfigTypeLogLevel)
logger.Debugw("global-log-config", log.Fields{"cc-global-config": cc.GlobalConfig})
cc.componentNameConfig = cm.InitComponentConfig(cc.ComponentName, ConfigTypeLogLevel)
logger.Debugw("component-log-config", log.Fields{"cc-component-name-config": cc.componentNameConfig})
cc.persistInitialDefaultLogConfigs(ctx)
cc.processLogConfig(ctx)
}
// Method to persist Global default loglevel into etcd, if not set yet
// It also checks and set Component default loglevel into etcd with initial loglevel set from command line
func (c *ComponentLogController) persistInitialDefaultLogConfigs(ctx context.Context) {
_, err := c.GlobalConfig.Retrieve(ctx, defaultLogLevelKey)
if err != nil {
logger.Debugw("failed-to-retrieve-global-default-log-config-at-startup", log.Fields{"error": err})
err = c.GlobalConfig.Save(ctx, defaultLogLevelKey, initialGlobalDefaultLogLevelValue)
if err != nil {
logger.Errorw("failed-to-persist-global-default-log-config-at-startup", log.Fields{"error": err, "loglevel": initialGlobalDefaultLogLevelValue})
}
}
_, err = c.componentNameConfig.Retrieve(ctx, defaultLogLevelKey)
if err != nil {
logger.Debugw("failed-to-retrieve-component-default-log-config-at-startup", log.Fields{"error": err})
err = c.componentNameConfig.Save(ctx, defaultLogLevelKey, c.initialLogLevel)
if err != nil {
logger.Errorw("failed-to-persist-component-default-log-config-at-startup", log.Fields{"error": err, "loglevel": c.initialLogLevel})
}
}
}
// ProcessLogConfig will first load and apply log config and then start waiting on component config and global config
// channels for any changes. Event channel will be recieved from Backend for valid change type
// Then data for componentn log config and global log config will be retrieved from Backend and stored in updatedLogConfig in precedence order
// If any changes in updatedLogConfig will be applied on component
func (c *ComponentLogController) processLogConfig(ctx context.Context) {
// Load and apply Log Config for first time
initialLogConfig, err := c.buildUpdatedLogConfig(ctx)
if err != nil {
logger.Warnw("unable-to-load-log-config-at-startup", log.Fields{"error": err})
} else {
if err := c.loadAndApplyLogConfig(initialLogConfig); err != nil {
logger.Warnw("unable-to-apply-log-config-at-startup", log.Fields{"error": err})
}
}
componentConfigEventChan := c.componentNameConfig.MonitorForConfigChange(ctx)
globalConfigEventChan := c.GlobalConfig.MonitorForConfigChange(ctx)
// process the events for componentName and global config
var configEvent *ConfigChangeEvent
for {
select {
case configEvent = <-globalConfigEventChan:
case configEvent = <-componentConfigEventChan:
}
logger.Debugw("processing-log-config-change", log.Fields{"ChangeType": configEvent.ChangeType, "Package": configEvent.ConfigAttribute})
updatedLogConfig, err := c.buildUpdatedLogConfig(ctx)
if err != nil {
logger.Warnw("unable-to-fetch-updated-log-config", log.Fields{"error": err})
continue
}
logger.Debugw("applying-updated-log-config", log.Fields{"updated-log-config": updatedLogConfig})
if err := c.loadAndApplyLogConfig(updatedLogConfig); err != nil {
logger.Warnw("unable-to-load-and-apply-log-config", log.Fields{"error": err})
}
}
}
// get active loglevel from the zap logger
func getActiveLogLevels() map[string]string {
loglevels := make(map[string]string)
// now do the default log level
if level, err := log.LogLevelToString(log.GetDefaultLogLevel()); err == nil {
loglevels[defaultLogLevelKey] = level
}
// do the per-package log levels
for _, packageName := range log.GetPackageNames() {
level, err := log.GetPackageLogLevel(packageName)
if err != nil {
logger.Warnw("unable-to-fetch-current-active-loglevel-for-package-name", log.Fields{"package-name": packageName, "error": err})
continue
}
if l, err := log.LogLevelToString(level); err == nil {
loglevels[packageName] = l
}
}
logger.Debugw("retreived-log-levels-from-zap-logger", log.Fields{"loglevels": loglevels})
return loglevels
}
func (c *ComponentLogController) getGlobalLogConfig(ctx context.Context) (string, error) {
globalDefaultLogLevel, err := c.GlobalConfig.Retrieve(ctx, defaultLogLevelKey)
if err != nil {
return "", err
}
// Handle edge cases when global default loglevel is deleted directly from etcd or set to a invalid value
// We should use hard-coded initial default value in such cases
if globalDefaultLogLevel == "" {
logger.Warn("global-default-loglevel-not-found-in-config-store")
globalDefaultLogLevel = initialGlobalDefaultLogLevelValue
}
if _, err := log.StringToLogLevel(globalDefaultLogLevel); err != nil {
logger.Warnw("unsupported-loglevel-config-defined-at-global-default", log.Fields{"log-level": globalDefaultLogLevel})
globalDefaultLogLevel = initialGlobalDefaultLogLevelValue
}
logger.Debugw("retrieved-global-default-loglevel", log.Fields{"level": globalDefaultLogLevel})
return globalDefaultLogLevel, nil
}
func (c *ComponentLogController) getComponentLogConfig(ctx context.Context, globalDefaultLogLevel string) (map[string]string, error) {
componentLogConfig, err := c.componentNameConfig.RetrieveAll(ctx)
if err != nil {
return nil, err
}
effectiveDefaultLogLevel := ""
for logConfigKey, logConfigValue := range componentLogConfig {
if _, err := log.StringToLogLevel(logConfigValue); err != nil || logConfigKey == "" {
logger.Warnw("unsupported-loglevel-config-defined-at-component-context", log.Fields{"package-name": logConfigKey, "log-level": logConfigValue})
delete(componentLogConfig, logConfigKey)
} else {
if logConfigKey == defaultLogLevelKey {
effectiveDefaultLogLevel = componentLogConfig[defaultLogLevelKey]
}
}
}
// if default loglevel is not configured for the component, component should use
// default loglevel configured at global level
if effectiveDefaultLogLevel == "" {
effectiveDefaultLogLevel = globalDefaultLogLevel
}
componentLogConfig[defaultLogLevelKey] = effectiveDefaultLogLevel
logger.Debugw("retrieved-component-log-config", log.Fields{"component-log-level": componentLogConfig})
return componentLogConfig, nil
}
// buildUpdatedLogConfig retrieve the global logConfig and component logConfig from Backend
// component logConfig stores the log config with precedence order
// For example, If the global logConfig is set and component logConfig is set only for specific package then
// component logConfig is stored with global logConfig and component logConfig of specific package
// For example, If the global logConfig is set and component logConfig is set for specific package and as well as for default then
// component logConfig is stored with component logConfig data only
func (c *ComponentLogController) buildUpdatedLogConfig(ctx context.Context) (map[string]string, error) {
globalLogLevel, err := c.getGlobalLogConfig(ctx)
if err != nil {
logger.Errorw("unable-to-retrieve-global-log-config", log.Fields{"err": err})
}
componentLogConfig, err := c.getComponentLogConfig(ctx, globalLogLevel)
if err != nil {
return nil, err
}
finalLogConfig := make(map[string]string)
for packageName, logLevel := range componentLogConfig {
finalLogConfig[strings.ReplaceAll(packageName, "#", "/")] = logLevel
}
return finalLogConfig, nil
}
// load and apply the current configuration for component name
// create hash of loaded configuration using GenerateLogConfigHash
// if there is previous hash stored, compare the hash to stored hash
// if there is any change will call UpdateLogLevels
func (c *ComponentLogController) loadAndApplyLogConfig(logConfig map[string]string) error {
currentLogHash, err := GenerateLogConfigHash(logConfig)
if err != nil {
return err
}
if c.logHash != currentLogHash {
UpdateLogLevels(logConfig)
c.logHash = currentLogHash
} else {
logger.Debug("effective-loglevel-config-same-as-currently-active")
}
return nil
}
// createModifiedLogLevels loops through the activeLogLevels recieved from zap logger and updatedLogLevels recieved from buildUpdatedLogConfig
// to identify and create map of modified Log Levels of 2 types:
// - Packages for which log level has been changed
// - Packages for which log level config has been cleared - set to default log level
func createModifiedLogLevels(activeLogLevels, updatedLogLevels map[string]string) map[string]string {
defaultLevel := updatedLogLevels[defaultLogLevelKey]
modifiedLogLevels := make(map[string]string)
for activeKey, activeLevel := range activeLogLevels {
if _, exist := updatedLogLevels[activeKey]; !exist {
if activeLevel != defaultLevel {
modifiedLogLevels[activeKey] = defaultLevel
}
} else if activeLevel != updatedLogLevels[activeKey] {
modifiedLogLevels[activeKey] = updatedLogLevels[activeKey]
}
}
// Log warnings for all invalid packages for which log config has been set
for key, value := range updatedLogLevels {
if _, exist := activeLogLevels[key]; !exist {
logger.Warnw("ignoring-loglevel-set-for-invalid-package", log.Fields{"package": key, "log-level": value})
}
}
return modifiedLogLevels
}
// updateLogLevels update the loglevels for the component
// retrieve active confguration from logger
// compare with entries one by one and apply
func UpdateLogLevels(updatedLogConfig map[string]string) {
activeLogLevels := getActiveLogLevels()
changedLogLevels := createModifiedLogLevels(activeLogLevels, updatedLogConfig)
// If no changed log levels are found, just return. It may happen on configuration of a invalid package
if len(changedLogLevels) == 0 {
logger.Debug("no-change-in-effective-loglevel-config")
return
}
logger.Debugw("applying-log-level-for-modified-packages", log.Fields{"changed-log-levels": changedLogLevels})
for key, level := range changedLogLevels {
if key == defaultLogLevelKey {
if l, err := log.StringToLogLevel(level); err == nil {
log.SetDefaultLogLevel(l)
}
} else {
if l, err := log.StringToLogLevel(level); err == nil {
log.SetPackageLogLevel(key, l)
}
}
}
}
// generate md5 hash of key value pairs appended into a single string
// in order by key name
func GenerateLogConfigHash(createHashLog map[string]string) ([16]byte, error) {
createHashLogBytes := []byte{}
levelData, err := json.Marshal(createHashLog)
if err != nil {
return [16]byte{}, err
}
createHashLogBytes = append(createHashLogBytes, levelData...)
return md5.Sum(createHashLogBytes), nil
}