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Copy pathconfig.go
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161 lines (140 loc) · 3.91 KB
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// Copyright (c) 2013 Kelsey Hightower. All rights reserved.
// Use of this source code is governed by the Apache License, Version 2.0
// that can be found in the LICENSE file.
package main
import (
"flag"
"fmt"
"path/filepath"
"github.com/BurntSushi/toml"
"github.com/kelseyhightower/confd/log"
)
var (
config Config
nodes Nodes
confdir string
interval int
prefix string
clientCert string
clientKey string
)
func init() {
flag.Var(&nodes, "n", "list of etcd nodes")
flag.StringVar(&confdir, "c", "/etc/confd", "confd config directory")
flag.IntVar(&interval, "i", 600, "etcd polling interval")
flag.StringVar(&prefix, "p", "/", "etcd key path prefix")
flag.StringVar(&clientCert, "cert", "", "the client cert")
flag.StringVar(&clientKey, "key", "", "the client key")
}
// Nodes is a custom flag Var representing a list of etcd nodes. We use a custom
// Var to allow us to define more than one etcd node from the command line, and
// collect the results in a single value.
type Nodes []string
func (n *Nodes) String() string {
return fmt.Sprintf("%d", *n)
}
// Set appends the node to the etcd node list.
func (n *Nodes) Set(node string) error {
*n = append(*n, node)
return nil
}
// Config represents the confd configuration settings.
type Config struct {
Confd confd
}
// confd represents the parsed configuration settings.
type confd struct {
ConfDir string
ClientCert string `toml:"client_cert"`
ClientKey string `toml:"client_key"`
Interval int
Prefix string
EtcdNodes []string `toml:"etcd_nodes"`
}
// loadConfig initializes the confd configuration by first setting defaults,
// then overriding setting from the confd config file, and finally overriding
// settings from flags set on the command line.
// It returns an error if any.
func loadConfig(path string) error {
setDefaults()
if path == "" {
log.Warning("Skipping confd config file.")
} else {
log.Debug("Loading " + path)
if err := loadConfFile(path); err != nil {
return err
}
}
overrideConfig()
return nil
}
// ConfigDir returns the path to the confd config dir.
func ConfigDir() string {
return filepath.Join(config.Confd.ConfDir, "conf.d")
}
// ClientCert returns the path to the client cert.
func ClientCert() string {
return config.Confd.ClientCert
}
// ClientKey returns the path to the client key.
func ClientKey() string {
return config.Confd.ClientKey
}
// EtcdNodes returns a list of etcd node url strings.
// For example: ["http://203.0.113.30:4001"]
func EtcdNodes() []string {
return config.Confd.EtcdNodes
}
// Interval returns the number of seconds to wait between configuration runs.
func Interval() int {
return config.Confd.Interval
}
// Prefix returns the etcd key prefix to use when querying etcd.
func Prefix() string {
return config.Confd.Prefix
}
// TemplateDir returns the path to the directory of config file templates.
func TemplateDir() string {
return filepath.Join(config.Confd.ConfDir, "templates")
}
func setDefaults() {
config = Config{
Confd: confd{
ConfDir: "/etc/confd",
Interval: 600,
Prefix: "/",
EtcdNodes: []string{"http://127.0.0.1:4001"},
},
}
}
// loadConfFile sets the etcd configuration settings from a file.
func loadConfFile(path string) error {
_, err := toml.DecodeFile(path, &config)
if err != nil {
return err
}
return nil
}
// override sets configuration settings based on values passed in through
// command line flags; overwriting current values.
func override(f *flag.Flag) {
switch f.Name {
case "c":
config.Confd.ConfDir = confdir
case "i":
config.Confd.Interval = interval
case "n":
config.Confd.EtcdNodes = nodes
case "p":
config.Confd.Prefix = prefix
case "cert":
config.Confd.ClientCert = clientCert
case "key":
config.Confd.ClientKey = clientKey
}
}
// overrideConfig iterates through each flag set on the command line and
// overrides corresponding configuration settings.
func overrideConfig() {
flag.Visit(override)
}