// Load an extensible section that has a type keyword
func LoadExtensibleSection(app *Application, sectionName string,
extensions AvailableExtensions, env envconf.Environment,
configFile ConfigFile) (obj HasConfigStruct, err error) {
confSection := new(ExtensibleGlobals)
conf, ok := configFile[sectionName]
if !ok {
return nil, fmt.Errorf("Missing section '%s'", sectionName)
}
if err = toml.PrimitiveDecode(conf, confSection); err != nil {
return nil, err
}
if err = env.Decode(toEnvName(sectionName), EnvSep, confSection); err != nil {
return nil, err
}
ext, ok := extensions.Get(confSection.Typ)
if !ok {
//TODO: Add log info to indicate using "default"
return nil, fmt.Errorf("No type '%s' available to load for section '%s'",
confSection.Typ, sectionName)
}
obj = ext()
loadedConfig, err := LoadConfigStruct(sectionName, env, conf, obj)
if err != nil {
return nil, err
}
err = obj.Init(app, loadedConfig)
return obj, err
}
// Loads the config for a section supplied, configures the supplied object, and initializes
func LoadConfigForSection(app *Application, sectionName string, obj HasConfigStruct,
env envconf.Environment, configFile ConfigFile) (err error) {
conf, ok := configFile[sectionName]
if !ok {
return fmt.Errorf("Error loading config file, section: %s", sectionName)
}
confStruct := obj.ConfigStruct()
if confStruct == nil {
return nil
}
if err = toml.PrimitiveDecode(conf, confStruct); err != nil {
return fmt.Errorf("Unable to decode config for section '%s': %s",
sectionName, err)
}
if err = env.Decode(toEnvName(sectionName), EnvSep, confStruct); err != nil {
return fmt.Errorf("Invalid environment variable for section '%s': %s",
sectionName, err)
}
err = obj.Init(app, confStruct)
return
}
func loadEnvConfig(env envconf.Environment, section string,
app *Application, configable HasConfigStruct) (err error) {
confStruct := configable.ConfigStruct()
if err = env.Decode(toEnvName(section), EnvSep, confStruct); err != nil {
return fmt.Errorf("Error decoding config for section %q: %s",
section, err)
}
return configable.Init(app, confStruct)
}
// Applies environment variable overrides to confStruct and initializes obj
func LoadConfigFromEnvironment(app *Application, sectionName string,
obj HasInit, env envconf.Environment, confStruct interface{}) (err error) {
if confStruct == nil {
return nil
}
if err = env.Decode(toEnvName(sectionName), EnvSep, confStruct); err != nil {
return fmt.Errorf("Invalid environment variable for section '%s': %s",
sectionName, err)
}
return obj.Init(app, confStruct)
}
func LoadConfigStruct(sectionName string, env envconf.Environment,
config toml.Primitive, configable HasConfigStruct) (
configStruct interface{}, err error) {
if configStruct = configable.ConfigStruct(); configStruct == nil {
return configStruct, nil
}
// Global section options
// SimplePush defines some common parameters
// that are defined in the ExtensibleGlobals struct.
// Use reflection to extract the tagged ExtensibleGlobals fields.
var pg ExtensibleGlobals
rt := reflect.TypeOf(pg)
ignoreConfig := make(map[string]interface{}, rt.NumField())
ignoreEnv := make(map[string]interface{}, rt.NumField())
for i := 0; i < rt.NumField(); i++ {
sft := rt.Field(i)
kname := sft.Tag.Get("toml")
if len(kname) == 0 {
kname = sft.Name
}
ignoreConfig[kname] = true
if kname = sft.Tag.Get("env"); len(kname) == 0 {
kname = sft.Name
}
ignoreEnv[toEnvName(sectionName, kname)] = true
}
if err = toml.PrimitiveDecodeStrict(config, configStruct, ignoreConfig); err != nil {
matches := unknownOptionRegex.FindStringSubmatch(err.Error())
if len(matches) == 2 {
// We've got an unrecognized config option.
err = fmt.Errorf("Unknown config setting for section '%s': %s",
sectionName, matches[1])
}
return nil, err
}
if err = env.DecodeStrict(toEnvName(sectionName), EnvSep, configStruct, ignoreEnv); err != nil {
return nil, fmt.Errorf("Invalid environment variable for section '%s': %s",
sectionName, err)
}
return configStruct, nil
}
