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appconfig.go
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appconfig.go
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package main
import (
"fmt"
"io/ioutil"
"log"
"strings"
)
var (
errInvalidConfName = fmt.Errorf("invalid name: <name>-<version>-<env>")
)
type ConfigKeys map[string][]byte
// Convert values to strings and return new map
func (ck ConfigKeys) ToString() map[string]string {
nm := map[string]string{}
for k, v := range ck {
nm[k] = string(v)
}
return nm
}
type AppConfig struct {
// Required fields
Name string
Version string
Env string
// Keys available to be applied to template
Keys ConfigKeys
// Available templates
Templates []*Template
// Backend consul, etcd ...
be Backend
}
func NewAppConfigFromName(name string, be Backend) (*AppConfig, error) {
a := &AppConfig{Templates: []*Template{}, Keys: ConfigKeys{}}
var err error
if a.Name, a.Version, a.Env, err = parseAppName(name); err == nil {
if be != nil {
a.be = be
err = a.Load()
}
}
return a, err
}
func (ac *AppConfig) AddTemplate(t *Template) error {
found := false
for _, v := range ac.Templates {
if v.Name == t.Name && v.Sha1 == t.Sha1 {
found = true
}
}
if !found {
keys, err := t.Keys()
if err != nil {
return err
}
ac.Templates = append(ac.Templates, t)
// add template keys
for k, _ := range keys {
if _, ok := ac.Keys[k]; !ok {
ac.Keys[k] = nil
}
}
}
return nil
}
func (c *AppConfig) Exists() bool {
return c.be.KeyExists(c.getOpaque(c.Env))
}
func (c *AppConfig) Metadata() map[string]interface{} {
log.Println(c.Keys)
return map[string]interface{}{
"id": c.QualifiedName(),
"name": c.Name,
"version": c.Version,
"env": c.Env,
"files": len(c.Templates),
"keys": len(c.Keys),
}
}
// Load data from backedn
func (a *AppConfig) Load() error {
gm, err := a.be.GetMap(a.getOpaque(""))
if err == nil {
a.Set(gm)
}
return err
}
func (a *AppConfig) QualifiedName() string {
return a.Name + "-" + a.Version + "-" + a.Env
}
// Store in mem datastructure to backend
func (a *AppConfig) Commit() error {
m := a.buildBackendDataMap()
// store to backend
return a.be.SetMap(a.getOpaque(""), m)
}
// Load data from backend, generate directory structure and
// rendered config files under `basedir`
func (a *AppConfig) Generate(basedir string) error {
err := a.Load()
if err == nil {
keys := a.Keys.ToString()
for _, t := range a.Templates {
rendered, err := t.Render(keys)
if err == nil {
if err = ioutil.WriteFile(basedir+"/"+t.Name, rendered, 0644); err == nil {
continue
}
}
break
}
}
return err
}
func (a *AppConfig) cacheRender() {
keys := a.Keys.ToString()
for _, t := range a.Templates {
if _, err := t.Render(keys); err != nil {
log.Println("ERR", err)
}
}
}
// Destroy keys from the backend.
func (a *AppConfig) Destroy() error {
return a.be.DeleteMap(a.getOpaque(a.Env + "/"))
}
// Set input data to datastructure. Strip key prefixes before setting
func (a *AppConfig) Set(data map[string][]byte) error {
for key, v := range data {
k := strings.TrimPrefix(key, a.getOpaque(""))
switch {
case strings.HasPrefix(k, "templates"):
if t := NewTemplateFromKey(k); t != nil {
t.SetBody(v)
a.AddTemplate(t)
}
default:
tk := strings.TrimPrefix(k, a.Env)
if tk = strings.TrimPrefix(tk, "/"); tk != "" {
a.Keys[tk] = v
}
}
}
return nil
}
func (a *AppConfig) getOpaque(n string) string {
return a.Name + "/" + a.Version + "/" + n
}
// build payload from in mem data to write to backend
// it adds the prefix to each key and returns a new map
func (a *AppConfig) buildBackendDataMap() map[string][]byte {
m := map[string][]byte{}
// Add environment prefix to each config key
if len(a.Keys) > 0 {
for k, v := range a.Keys {
m[a.Env+"/"+k] = v
}
} else {
m[a.Env] = []byte{}
}
// Add prefix to template keys
for _, t := range a.Templates {
m["templates/"+t.Name] = t.Body
}
return m
}
func parseAppName(n string) (name, version, env string, err error) {
pp := strings.Split(n, "-")
if len(pp) < 3 {
err = errInvalidConfName
return
}
env = pp[len(pp)-1]
version = pp[len(pp)-2]
name = strings.Join(pp[:len(pp)-2], "-")
if env == "" || version == "" || name == "" {
err = errInvalidConfName
}
return
}