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config.go
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config.go
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// Copyright 2020 Valeriy Soloviov. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// license that can be found in the LICENSE file.
// Package config provides configuration for `supraworker` application.
package config
import (
"bytes"
"fmt"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
"html/template"
"os"
"runtime"
"strings"
"time"
)
const (
// ProjectName defines project name
ProjectName = "supraworker"
// Default number of workers
DefaultNumWorkers = 5
)
// Config is top level Configuration structure
type Config struct {
// Identification for the process
ClientId string `mapstructure:"clientId"`
NumActiveJobs int64 // Number of jobs
NumFreeSlots int // Number of free jobs slots
NumWorkers int `mapstructure:"workers"`
PrometheusNamespace string
PrometheusService string
ClusterId string `mapstructure:"clusterId"`
ClusterPool string `mapstructure:"clusterPool"`
URL string // Used for overload URL for Tests "{{.URL}}"
// delay between API calls to prevent Denial-of-service
CallAPIDelaySec int `mapstructure:"api_delay_sec"`
// Config version
ConfigVersion string `mapstructure:"version"`
}
var (
// CfgFile defines Path to the config.
CfgFile string
// ClientId defines Identification for the instance.
ClientId string
// NumWorkers parallel threads for processing jobs.
NumWorkers int
// C defines main configuration structure.
C = Config{
CallAPIDelaySec: int(2),
NumActiveJobs: 0,
NumFreeSlots: 0,
NumWorkers: 0,
}
log = logrus.WithFields(logrus.Fields{"package": "config"})
)
// Init configuration
func init() {
cobra.OnInitialize(initConfig)
}
func choseClientId() {
switch {
case len(ClientId) > 0:
C.ClientId = ClientId
case len(C.ClientId) > 0:
default:
C.ClientId = "supraworker"
}
log.Tracef("Using ClientId %s", C.ClientId)
}
func updateNumWorkers() {
switch {
case NumWorkers > 0:
C.NumWorkers = NumWorkers
case C.NumWorkers > 0:
default:
C.NumWorkers = DefaultNumWorkers
}
log.Tracef("Using NumWorkers %d", C.NumWorkers)
}
func updateProm() {
C.PrometheusService = GetStringTemplatedDefault("prometheus.service", "default")
C.PrometheusNamespace = GetStringTemplatedDefault("prometheus.namespace", "supraworker")
}
// ReinitializeConfig on load or file change
func ReinitializeConfig() {
choseClientId()
updateNumWorkers()
updateProm()
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
// Don't forget to read config either from CfgFile or from home directory!
if CfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(CfgFile)
} else {
lProjectName := strings.ToLower(ProjectName)
log.Debug("Searching for config with project", ProjectName)
viper.AddConfigPath(".")
viper.AddConfigPath("..")
switch runtime.GOOS {
case "windows":
if userprofile := os.Getenv("USERPROFILE"); userprofile != "" {
viper.AddConfigPath(userprofile)
}
default:
// freebsd, openbsd, darwin, linux
// plan9, windows...
viper.AddConfigPath("$HOME/")
viper.AddConfigPath(fmt.Sprintf("$HOME/.%s/", lProjectName))
viper.AddConfigPath("/etc/")
viper.AddConfigPath(fmt.Sprintf("/etc/%s/", lProjectName))
}
if conf := os.Getenv(fmt.Sprintf("%s_CFG", strings.ToUpper(ProjectName))); conf != "" {
viper.SetConfigName(conf)
} else {
viper.SetConfigType("yaml")
viper.SetConfigName(lProjectName)
}
}
viper.AutomaticEnv()
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err != nil {
logrus.Fatalf("Can't read config: %s", err)
}
err := viper.Unmarshal(&C)
if err != nil {
logrus.Fatalf("unable to decode into struct, %v", err)
}
log.Debug(viper.ConfigFileUsed())
choseClientId()
updateNumWorkers()
updateProm()
}
func GetStringTemplatedDefault(section string, def string) string {
v := viper.GetString(section)
if len(v) > 0 {
var tplBytes bytes.Buffer
tpl, err1 := template.New("params").Parse(v)
if err1 != nil {
return def
}
err := tpl.Execute(&tplBytes, C)
if err != nil {
return def
}
return tplBytes.String()
}
return def
}
// GetMapStringMapStringTemplatedDefault returns map of [string]string maps templated & enriched by default.
func GetMapStringMapStringTemplatedDefault(section string, param string, def map[string]string) map[string]map[string]string {
ret := make(map[string]map[string]string)
sectionsValues := viper.GetStringMap(fmt.Sprintf("%s.%s", section, param))
for subsection, sectionValue := range sectionsValues {
if sectionValue == nil {
continue
}
if params, ok := sectionValue.(map[string]interface{}); ok {
c := make(map[string]string)
for k, v := range def {
c[k] = v
}
for k, v := range params {
var tplBytes bytes.Buffer
tpl, err1 := template.New("params").Parse(fmt.Sprintf("%v", v))
if err1 != nil {
continue
}
// tpl := template.Must(template.New("params").Parse(fmt.Sprintf("%v", v)))
if err := tpl.Execute(&tplBytes, C); err != nil {
// log.Tracef("params executing template for %v got %s", v, err)
continue
}
c[k] = tplBytes.String()
}
ret[fmt.Sprintf("%s.%s.%s", section, param, subsection)] = c
}
}
return ret
}
func GetStringMapStringTemplatedDefault(section string, param string, def map[string]string) map[string]string {
c := make(map[string]string)
for k, v := range def {
c[k] = v
}
params := viper.GetStringMapString(fmt.Sprintf("%s.%s", section, param))
for k, v := range params {
var tplBytes bytes.Buffer
// WARNING: will panic:
// tpl := template.Must(template.New("params").Parse(v))
// we can preserve failed templated string
c[k] = v
tpl, err1 := template.New("params").Parse(v)
if err1 != nil {
continue
}
err := tpl.Execute(&tplBytes, C)
if err != nil {
log.Tracef("params executing template: %s", err)
continue
}
c[k] = tplBytes.String()
}
return c
}
// GetStringDefault return section string or default.
func GetStringDefault(section string, def string) string {
if val := viper.GetString(section); len(val) > 0 {
return val
}
return def
}
// GetBool return section string or default.
func GetBool(section string) bool {
return viper.GetBool(section)
}
func GetStringMapStringTemplated(section string, param string) map[string]string {
c := make(map[string]string)
return GetStringMapStringTemplatedDefault(section, param, c)
}
// GetIntSlice returns []int or default.
func GetIntSlice(section string, param string, def []int) []int {
if val := viper.GetIntSlice(fmt.Sprintf("%v.%v", section, param)); len(val) > 0 {
return val
}
return def
}
func GetStringMapStringTemplatedFromMap(section string, param string, from map[string]string) map[string]string {
c := make(map[string]string)
return GetStringMapStringTemplatedFromMapDefault(section, param, from, c)
}
func GetStringMapStringTemplatedFromMapDefault(section string, param string, from map[string]string, def map[string]string) map[string]string {
c := make(map[string]string)
for k, v := range def {
c[k] = v
}
params := viper.GetStringMapString(fmt.Sprintf("%s.%s", section, param))
for k, v := range params {
var tplBytes bytes.Buffer
// WARNING: will panic:
// tpl := template.Must(template.New("params").Parse(v))
// we can preserve failed templated string
c[k] = v
tpl, err1 := template.New("params").Parse(v)
if err1 != nil {
continue
}
err := tpl.Execute(&tplBytes, from)
if err != nil {
log.Tracef("Failed params executing template: %s from : %v", err, from)
continue
}
c[k] = tplBytes.String()
}
return c
}
// GetTimeDuration return delay for the section with default of 1 second.
// Example config:
// section:
// interval: 5s
func GetTimeDurationDefault(section string, param string, def time.Duration) (interval time.Duration) {
var comp time.Duration
for _, k := range []string{fmt.Sprintf("%v.%v.%v", section, param, CFG_INTERVAL_PARAMETER),
fmt.Sprintf("%v.%v", section, param), section, CFG_INTERVAL_PARAMETER} {
delay := viper.GetDuration(k)
if delay > comp && delay.Milliseconds() > 0 {
return delay
}
}
return def
}