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package config
import (
"fmt"
"io"
"reflect"
"strings"
"gopkg.in/yaml.v3"
"github.com/Necoro/feed2imap-go/pkg/log"
)
const (
strTag = "!!str"
nullTag = "!!null"
emptyTag = ""
)
type config struct {
*Config `yaml:",inline"`
GlobalConfig Map `yaml:",inline"`
Feeds []configGroupFeed
}
type group struct {
Group string
Feeds []configGroupFeed
}
type configGroupFeed struct {
Target yaml.Node
Feed Feed `yaml:",inline"`
Group group `yaml:",inline"`
Options Map `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(in io.Reader, cfg *Config) (config, error) {
parsedCfg := config{Config: cfg}
d := yaml.NewDecoder(in)
if err := d.Decode(&parsedCfg); err != nil && err != io.EOF {
return config{}, err
}
return parsedCfg, nil
}
func (cfg *Config) parse(in io.Reader) error {
var (
err error
parsedCfg config
)
if parsedCfg, err = unmarshal(in, cfg); err != nil {
return fmt.Errorf("while unmarshalling: %w", err)
}
if err := buildFeeds(parsedCfg.Feeds, []string{}, cfg.Feeds, &cfg.FeedOptions); 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)
}
}
func buildOptions(globalFeedOptions *Options, options Map) (feedOptions Options, unknownFields []string) {
if options == nil {
// no options set for the feed: copy global options and be done
return *globalFeedOptions, unknownFields
}
fv := reflect.ValueOf(&feedOptions).Elem()
gv := reflect.ValueOf(globalFeedOptions).Elem()
n := gv.NumField()
for i := 0; i < n; i++ {
val := fv.Field(i)
f := fv.Type().Field(i)
if f.PkgPath != "" && !f.Anonymous {
continue
}
tag := f.Tag.Get("yaml")
if tag == "" {
continue
}
name := strings.Split(tag, ",")[0]
set, ok := options[name]
if ok { // in the map -> copy and delete
val.Set(reflect.ValueOf(set))
delete(options, name)
} else { // not in the map -> copy from global
val.Set(gv.Field(i))
}
}
// remaining fields are unknown
for k := range options {
unknownFields = append(unknownFields, k)
}
return feedOptions, unknownFields
}
// Fetch the group structure and populate the `targetStr` fields in the feeds
func buildFeeds(cfg []configGroupFeed, target []string, feeds Feeds, globalFeedOptions *Options) 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)
}
opt, unknown := buildOptions(globalFeedOptions, f.Options)
for _, optName := range unknown {
log.Warnf("Unknown option '%s' for feed '%s'. Ignored!", optName, name)
}
feedCopy.Options = opt
feedCopy.Target = target
feeds[name] = &feedCopy
case f.isGroup():
if err := buildFeeds(f.Group.Feeds, target, feeds, globalFeedOptions); err != nil {
return err
}
for optName := range f.Options {
log.Warnf("Unknown option '%s' for group '%s'. Ignored!", optName, f.Group.Group)
}
}
}
return nil
}
|
