tg_exporter/internal/db_channel.go

package internal

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"time"

	"exporter/config"
	"exporter/database/telegram_resource/public/model"
	"exporter/database/telegram_resource/public/table"

	. "github.com/go-jet/jet/v2/postgres"
	"github.com/go-jet/jet/v2/qrm"
	"github.com/lib/pq"
	"github.com/pkg/errors"
	"github.com/samber/lo"
)

type DBChannel struct {
	UUID     int64
	Username string
	Title    string
	Offset   int
	MinID    int
}

func NewDBChannel(uuid int64, username, title string) *DBChannel {
	if uuid == 0 {
		panic("channel id is required")
	}
	return &DBChannel{
		UUID:     uuid,
		Username: username,
		Title:    title,
	}
}

func (c *DBChannel) Asset(assetID int64, ext string) string {
	assetFile := fmt.Sprintf("%d/%d.%s", c.UUID, assetID, strings.Trim(ext, "."))
	assetFile = filepath.Join(config.C.Output, assetFile)

	// if file dir not exists then create it
	if _, err := os.Stat(filepath.Dir(assetFile)); os.IsNotExist(err) {
		if err := os.MkdirAll(filepath.Dir(assetFile), 0o755); err != nil {
			panic(err)
		}
	}

	// if file exists then delete it
	if _, err := os.Stat(assetFile); err == nil {
		if err := os.Remove(assetFile); err != nil {
			panic(err)
		}
	}

	return assetFile
}

func (c *DBChannel) Get(ctx context.Context) error {
	tbl := table.Channels

	var m model.Channels

	err := tbl.SELECT(tbl.AllColumns).WHERE(tbl.UUID.EQ(Int64(c.UUID))).QueryContext(ctx, db, &m)
	if err != nil {
		if errors.Is(err, qrm.ErrNoRows) {
			// create new channel with default value
			m = model.Channels{
				UUID:      c.UUID,
				Username:  c.Username,
				Title:     c.Title,
				MinID:     0,
				Offset:    0,
				CreatedAt: lo.ToPtr(time.Now()),
				UpdatedAt: lo.ToPtr(time.Now()),
			}

			if _, err := tbl.INSERT(tbl.AllColumns.Except(tbl.ID)).MODEL(m).ExecContext(ctx, db); err != nil {
				return errors.Wrap(err, "insert channel")
			}
		} else {
			return errors.Wrap(err, "select channel")
		}
	}
	c.MinID = int(m.MinID)
	c.Offset = int(m.Offset)

	return nil
}

func (c *DBChannel) Update(ctx context.Context, offsetID int) error {
	c.Offset = offsetID

	if c.MinID < offsetID {
		c.MinID = offsetID
	}

	tbl := table.Channels
	_, err := tbl.UPDATE().
		SET(
			tbl.Offset.SET(Int64(int64(c.Offset))),
			tbl.MinID.SET(Int64(int64(c.MinID))),
		).
		WHERE(tbl.UUID.EQ(Int64(c.UUID))).
		ExecContext(ctx, db)
	if err != nil {
		return errors.Wrap(err, "update channel")
	}

	return nil
}

func (c *DBChannel) SaveMessage(ctx context.Context, msg *ChannelMessage) error {
	message := &model.ChannelMessages{
		ChannelID:   c.UUID,
		GroupID:     msg.GroupID,
		UUID:        int64(msg.ID),
		Content:     lo.ToPtr(msg.Message),
		Media:       msg.GetMedias(),
		PublishedAt: msg.PublishAt,
		CreatedAt:   time.Now(),
	}

	tbl := table.ChannelMessages

	var m model.ChannelMessages
	err := tbl.
		SELECT(tbl.ID).
		WHERE(
			tbl.GroupID.EQ(Int(message.GroupID)).AND(
				tbl.UUID.EQ(Int64(message.UUID)),
			),
		).
		LIMIT(1).
		QueryContext(ctx, db, &m)
	if err != nil {
		// 如果没有找到记录，那么插入新记录
		if errors.Is(err, qrm.ErrNoRows) {
			_, err = tbl.INSERT(tbl.AllColumns.Except(tbl.ID)).MODEL(message).ExecContext(ctx, db)
			if err != nil {
				if e, ok := err.(*pq.Error); ok {
					if e.Code == "23505" {
						return nil
					}
				}
				return errors.Wrap(err, "insert message")
			}
			return nil
		}
		return errors.Wrap(err, "select message")
	}

	// 如果找到记录，那么更新记录
	stmt := tbl.UPDATE().SET(
		tbl.Content.SET(RawString(`CONCAT(content, #var)`, RawArgs{
			"#var": *message.Content,
		})),
		tbl.Media.SET(RawString(`media || #var::jsonb`, RawArgs{
			"#var": msg.GetMedia(),
		})),
	).WHERE(
		tbl.GroupID.EQ(Int(message.GroupID)).AND(
			tbl.UUID.EQ(Int(message.UUID)),
		),
	)

	_, err = db.ExecContext(ctx, stmt.DebugSql())

	return err
}