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package application
import (
"context"
"fmt"
"log/slog"
"os"
"sync"
cm "go.neonxp.ru/conf/model"
"go.neonxp.ru/pose/internal/database"
"go.neonxp.ru/pose/internal/model"
"go.neonxp.ru/pose/internal/source"
"go.neonxp.ru/pose/internal/target"
)
type Application struct {
logger *slog.Logger
db *database.DB
sources []Source
targets []Target
wg sync.WaitGroup
}
func New(cfg cm.Group, logger *slog.Logger) (*Application, error) {
dbfile := cfg.Get("db_file").StringExt("", os.LookupEnv)
db, err := database.New(dbfile)
if err != nil {
return nil, fmt.Errorf("failed create db: %w", err)
}
app := &Application{
logger: logger,
db: db,
sources: []Source{},
targets: []Target{},
wg: sync.WaitGroup{},
}
//Build sources
for _, it := range cfg.Get("sources").Group() {
name := it.String()
switch it.Name {
case cm.Ident("feed"):
src, err := source.NewFeed(
it.Group(),
app.logger.With(slog.String("source", name)),
)
if err != nil {
return nil, err
}
app.sources = append(app.sources, src)
default:
return nil, fmt.Errorf("unknown source type: %s", it.Name)
}
}
// Build targets
for _, it := range cfg.Get("targets").Group() {
name := it.String()
switch it.Name {
case cm.Ident("telegram"):
tgt, err := target.NewTelegram(
it.Group(),
app.logger.With(slog.String("target", name)),
)
if err != nil {
return nil, err
}
app.targets = append(app.targets, tgt)
default:
return nil, fmt.Errorf("unknown target type: %s", it.Name)
}
}
return app, nil
}
func (a *Application) Run(ctx context.Context) error {
defer a.wg.Wait()
// Сборный канал со всех источников
inChan := a.inChan(ctx)
// Срез каналов всех потребителей
outChans := a.outChans(ctx)
// Перекладывание сообщений из inChan во все outChans
for it := range inChan {
for _, ch := range outChans {
select {
case ch <- it:
slog.InfoContext(ctx, "trying send feed item to target", slog.String("id", it.ID))
default:
slog.WarnContext(ctx, "feed item ignored because no free targets")
}
}
}
return nil
}
func (a *Application) Close() error {
return a.db.Close()
}
func (a *Application) inChan(ctx context.Context) chan model.Item {
inChan := make(chan model.Item, 1)
a.wg.Go(func() {
<-ctx.Done()
close(inChan)
})
for _, s := range a.sources {
a.wg.Go(func() {
for it := range s.Retrive(ctx) {
if a.db.Exists(it.ID) {
continue
}
if err := a.db.Append(it.ID); err != nil {
a.logger.ErrorContext(ctx, "failed to add item to deduplication db", slog.Any("err", err))
continue
}
inChan <- it
}
})
}
return inChan
}
func (a *Application) outChans(ctx context.Context) []chan<- model.Item {
outChans := make([]chan<- model.Item, len(a.targets))
for i, t := range a.targets {
outChans[i] = t.Send(ctx)
}
return outChans
}
type Source interface {
Retrive(ctx context.Context) <-chan model.Item
}
type Target interface {
Send(ctx context.Context) chan<- model.Item
}
|
