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|
package config
import (
"fmt"
"gopkg.in/yaml.v3"
)
const (
strTag = "!!str"
nullTag = "!!null"
emptyTag = ""
)
type config struct {
*Config `yaml:",inline"`
GlobalConfig Map `yaml:",inline"` // need to be duplicated, because the Map in Config is not filled
Feeds []configGroupFeed
}
type group struct {
Group string
Feeds []configGroupFeed
}
type configGroupFeed struct {
Target yaml.Node
Feed Feed `yaml:",inline"`
Group group `yaml:",inline"`
}
func (grpFeed *configGroupFeed) isGroup() bool {
return grpFeed.Group.Group != ""
}
func (grpFeed *configGroupFeed) isFeed() bool {
return grpFeed.Feed.Name != "" || grpFeed.Feed.Url != ""
}
func (grpFeed *configGroupFeed) target() string {
tag := grpFeed.Target.ShortTag()
switch tag {
case strTag:
return grpFeed.Target.Value
case nullTag:
return ""
case emptyTag:
// tag not set: continue on
default:
panic("unexpected tag " + tag + " for target node")
}
if grpFeed.Feed.Name != "" {
return grpFeed.Feed.Name
}
return grpFeed.Group.Group
}
func unmarshal(buf []byte, cfg *Config) (config, error) {
parsedCfg := config{Config: cfg}
if err := yaml.Unmarshal(buf, &parsedCfg); err != nil {
return config{}, err
}
//fmt.Printf("--- parsedCfg:\n%+v\n\n", parsedCfg)
if parsedCfg.GlobalConfig == nil {
cfg.GlobalConfig = Map{}
} else {
cfg.GlobalConfig = parsedCfg.GlobalConfig // need to copy the map explicitly
}
return parsedCfg, nil
}
func (cfg *Config) parse(buf []byte) error {
var (
err error
parsedCfg config
)
if parsedCfg, err = unmarshal(buf, cfg); err != nil {
return fmt.Errorf("while unmarshalling: %w", err)
}
if err := buildFeeds(parsedCfg.Feeds, []string{}, cfg.Feeds); err != nil {
return fmt.Errorf("while parsing: %w", err)
}
return nil
}
func appTarget(target []string, app string) []string {
switch {
case len(target) == 0 && app == "":
return []string{}
case len(target) == 0:
return []string{app}
case app == "":
return target
default:
return append(target, app)
}
}
// Fetch the group structure and populate the `targetStr` fields in the feeds
func buildFeeds(cfg []configGroupFeed, target []string, feeds Feeds) error {
for _, f := range cfg {
target := appTarget(target, f.target())
switch {
case f.isFeed() && f.isGroup():
return fmt.Errorf("Entry with targetStr %s is both a Feed and a group", target)
case f.isFeed():
feedCopy := f.Feed
name := f.Feed.Name
if name == "" {
return fmt.Errorf("Unnamed feed")
}
if _, ok := feeds[name]; ok {
return fmt.Errorf("Duplicate Feed Name '%s'", name)
}
feedCopy.Target = target
feeds[name] = &feedCopy
case f.isGroup():
if err := buildFeeds(f.Group.Feeds, target, feeds); err != nil {
return err
}
}
}
return nil
}
|
