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broker_out_common.go
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broker_out_common.go
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// Copyright (c) 2014 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package output
import (
"encoding/json"
"fmt"
"strconv"
"strings"
"gopkg.in/yaml.v2"
)
//------------------------------------------------------------------------------
type brokerOutputList []Config
// UnmarshalJSON ensures that when parsing configs that are in a map or slice
// the default values are still applied.
func (b *brokerOutputList) UnmarshalJSON(bytes []byte) error {
genericOutputs := []interface{}{}
if err := json.Unmarshal(bytes, &genericOutputs); err != nil {
return err
}
inputConfs, err := parseOutputConfsWithDefaults(genericOutputs)
if err != nil {
return err
}
*b = inputConfs
return nil
}
// UnmarshalYAML ensures that when parsing configs that are in a map or slice
// the default values are still applied.
func (b *brokerOutputList) UnmarshalYAML(unmarshal func(interface{}) error) error {
genericOutputs := []interface{}{}
if err := unmarshal(&genericOutputs); err != nil {
return err
}
inputConfs, err := parseOutputConfsWithDefaults(genericOutputs)
if err != nil {
return err
}
*b = inputConfs
return nil
}
//------------------------------------------------------------------------------
// parseOutputConfsWithDefaults takes an array of output configs as
// []interface{} and returns an array of output configs with default values in
// place of omitted values. This is necessary because when unmarshalling config
// files using structs you can pre-populate non-reference type struct fields
// with default values, but array objects will lose those defaults.
//
// In order to ensure that omitted values are set to default we initially parse
// the array as interface{} types and then individually apply the defaults by
// marshalling and unmarshalling. The correct way to do this would be to use
// json.RawMessage, but our config files can contain a range of different
// formats that we do not know at this stage (JSON, YAML, etc), therefore we use
// the more hacky method as performance is not an issue at this stage.
func parseOutputConfsWithDefaults(outConfs []interface{}) ([]Config, error) {
type confAlias Config
outputConfs := []Config{}
for i, boxedConfig := range outConfs {
newConfs := []confAlias{confAlias(NewConfig())}
if i > 0 {
// If the type of this output is 'ditto' we want to start with a
// duplicate of the previous config.
newConfsFromDitto := func(label string) error {
// Remove the vanilla config.
newConfs = []confAlias{}
if len(label) > 5 && label[5] == '_' {
if label[6:] == "0" {
// This is a special case where we are expressing that
// we want to end up with zero duplicates.
return nil
}
n, err := strconv.Atoi(label[6:])
if err != nil {
return fmt.Errorf("failed to parse ditto multiplier: %v", err)
}
for j := 0; j < n; j++ {
newConfs = append(newConfs, confAlias(outputConfs[i-1]))
}
} else {
newConfs = append(newConfs, confAlias(outputConfs[i-1]))
}
return nil
}
switch unboxed := boxedConfig.(type) {
case map[string]interface{}:
if t, ok := unboxed["type"].(string); ok && strings.Index(t, "ditto") == 0 {
if err := newConfsFromDitto(t); err != nil {
return nil, err
}
if len(newConfs) > 0 {
unboxed["type"] = newConfs[0].Type
}
}
case map[interface{}]interface{}:
if t, ok := unboxed["type"].(string); ok && strings.Index(t, "ditto") == 0 {
if err := newConfsFromDitto(t); err != nil {
return nil, err
}
if len(newConfs) > 0 {
unboxed["type"] = newConfs[0].Type
}
}
}
}
for _, conf := range newConfs {
rawBytes, err := yaml.Marshal(boxedConfig)
if err != nil {
return nil, err
}
if err = yaml.Unmarshal(rawBytes, &conf); err != nil {
return nil, err
}
outputConfs = append(outputConfs, Config(conf))
}
}
return outputConfs, nil
}
//------------------------------------------------------------------------------