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config.go
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config.go
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package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"strconv"
"github.com/BurntSushi/toml"
log "github.com/Sirupsen/logrus"
)
type Config struct {
Interval int `toml:"interval"`
MetadataVersion string `toml:"metadata-version"`
LogLevel string `toml:"log-level"`
OneTime bool `toml:"onetime"`
IncludeInactive bool `toml:"include-inactive"`
Templates []Template `toml:"template"`
}
type Template struct {
Source string `toml:"source"`
Dest string `toml:"dest"`
CheckCmd string `toml:"check-cmd"`
NotifyCmd string `toml:"notify-cmd"`
NotifyOutput bool `toml:"notify-output"`
}
func initConfig() (*Config, error) {
config := Config{
MetadataVersion: "latest",
Interval: 5,
LogLevel: "info",
}
if len(configFile) > 0 {
log.Debugf("Loading config from file %s", configFile)
err := setConfigFromFile(configFile, &config)
if err != nil {
return nil, fmt.Errorf("Could not load config file: %v", err)
}
} else {
setTemplateFromFlags(&config)
}
overwriteConfigFromEnv(&config)
overwriteConfigFromFlags(&config)
if config.Interval == 0 {
return nil, fmt.Errorf("Interval must be greater than 0")
}
lvl, err := log.ParseLevel(config.LogLevel)
if err != nil {
return nil, fmt.Errorf("Invalid log level: %s", config.LogLevel)
}
log.SetLevel(lvl)
return &config, nil
}
func setConfigFromFile(path string, conf *Config) error {
buf, err := ioutil.ReadFile(path)
if err != nil {
return err
}
_, err = toml.Decode(string(buf), conf)
if err != nil {
return err
}
return nil
}
func setTemplateFromFlags(conf *Config) {
tmpl := Template{
Source: flag.Arg(0),
Dest: flag.Arg(1),
CheckCmd: checkCmd,
NotifyCmd: notifyCmd,
NotifyOutput: notifyOutput,
}
conf.Templates = []Template{tmpl}
}
func overwriteConfigFromFlags(conf *Config) {
flag.Visit(func(f *flag.Flag) {
switch f.Name {
case "interval":
conf.Interval = interval
case "metadata-version":
conf.MetadataVersion = metadataVersion
case "onetime":
conf.OneTime = onetime
case "include-inactive":
conf.IncludeInactive = includeInactive
case "log-level":
conf.LogLevel = logLevel
}
})
}
func overwriteConfigFromEnv(conf *Config) {
var env string
if env = os.Getenv("RANCHER_GEN_LOGLEVEL"); len(env) > 0 {
conf.LogLevel = env
}
if env = os.Getenv("RANCHER_GEN_INTERVAL"); len(env) > 0 {
interval, err := strconv.Atoi(env)
if err != nil {
conf.Interval = interval
} else {
log.Warnf("Invalid value for environment variable 'RANCHER_GEN_INTERVAL': %s", env)
}
}
if env = os.Getenv("RANCHER_GEN_METADATA_VER"); len(env) > 0 {
conf.MetadataVersion = env
}
if env = os.Getenv("RANCHER_GEN_ONETIME"); len(env) > 0 {
conf.OneTime = true
}
if env = os.Getenv("RANCHER_GEN_INACTIVE"); len(env) > 0 {
conf.IncludeInactive = true
}
}