113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package usecase
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import (
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"context"
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"fmt"
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"github.com/TelegramExchange/pkg/transaction"
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"github.com/rs/zerolog/log"
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"github.com/TelegramExchange/tgex-backend/tg_parser/internal/domain"
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)
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func (uc *UseCase) FetchChannels(ctx context.Context) error {
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channels := uc.database.GetChannels(ctx)
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for _, c := range channels {
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if c.Pts == 0 {
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updatedChannel, err := uc.initializeChannel(ctx, c)
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if err != nil {
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return fmt.Errorf("uc.initializeChannel: %w", err)
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}
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c = updatedChannel
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}
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err := uc.processChannel(ctx, c)
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if err != nil {
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return fmt.Errorf("uc.processChannel: %w", err)
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}
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}
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return nil
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}
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func (uc *UseCase) processChannel(ctx context.Context, channel domain.Channel) error {
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diff, err := uc.telegram.GetChannelDiff(ctx, channel, 20)
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if err != nil {
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return fmt.Errorf("telegram.GetChannelDiff: %w", err)
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}
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for _, p := range diff.NewPosts {
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log.Info().Msgf("New post: %s - Views: %d, Text: %.10s...", p.Link, p.Views, p.Text)
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err = uc.database.CreatePost(ctx, p)
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if err != nil {
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return fmt.Errorf("database.CreatePost: %w", err)
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}
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}
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for _, p := range diff.DeletedPosts {
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log.Info().Msgf("Deleted post: %s - Views: %d", p.Link, p.Views)
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err = uc.database.DeletePost(ctx, p)
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if err != nil {
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return fmt.Errorf("database.DeletePost: %w", err)
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}
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}
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// Update channel metadata if changed
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if diff.UpdatedChannel != nil {
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diff.UpdatedChannel.Pts = diff.NewPts
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err = uc.database.UpdateChannel(ctx, *diff.UpdatedChannel)
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if err != nil {
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return fmt.Errorf("database.UpdateChannel: %w", err)
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}
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} else {
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channel.Pts = diff.NewPts
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err = uc.database.UpdateChannel(ctx, channel)
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if err != nil {
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return fmt.Errorf("database.UpdateChannel: %w", err)
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}
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}
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return nil
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}
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func (uc *UseCase) initializeChannel(ctx context.Context, channel domain.Channel) (domain.Channel, error) {
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c, err := uc.telegram.ParseChannelMeta(ctx, channel.Username)
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if err != nil {
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return domain.Channel{}, fmt.Errorf("telegram.ParseChannelMeta: %w", err)
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}
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// Preserve persistent channel ID from the database so foreign keys remain valid.
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c.ID = channel.ID
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posts, err := uc.telegram.GetChannelHistory(ctx, c, 20)
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if err != nil {
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return domain.Channel{}, fmt.Errorf("telegram.GetChannelHistory: %w", err)
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}
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err = transaction.Wrap(ctx, func(ctx context.Context) error {
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err = uc.database.UpdateChannel(ctx, c)
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if err != nil {
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return fmt.Errorf("database.UpdateChannel: %w", err)
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}
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for _, p := range posts {
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log.Info().Msgf("New post (init): %s - Views: %d", p.Link, p.Views)
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err = uc.database.CreatePost(ctx, p)
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if err != nil {
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return fmt.Errorf("database.CreatePost: %w", err)
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}
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}
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return nil
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})
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if err != nil {
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return domain.Channel{}, fmt.Errorf("transaction.Wrap: %w", err)
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}
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return c, nil
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}
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