123 lines
2.5 KiB
Go
123 lines
2.5 KiB
Go
package app
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import (
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"encoding/csv"
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"errors"
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"fmt"
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"os"
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"path"
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"strings"
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"time"
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"go.balki.me/tss/log"
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"go.balki.me/tss/parser"
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)
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type Status string
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const (
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Sent Status = "SENT"
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Filtered = "FILTERED"
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Error = "ERROR"
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)
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//default format used by yaml.Marshal
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const TimeFormat string = "2006-01-02T15:04:05.999999999-07:00"
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type Record struct {
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Time time.Time
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Status Status
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Filter string
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FeedEntry parser.FeedEntry
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}
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type DB interface {
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IsNewFeed() bool
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Filter(entries []parser.FeedEntry) ([]parser.FeedEntry, error)
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Save([]Record) error
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}
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type db struct {
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dbPath string
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seenLinks map[string]struct{}
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}
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func (d *db) IsNewFeed() bool {
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return len(d.seenLinks) == 0
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}
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func NewDB(storageDir, feedName string) (DB, error) {
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dbPath := path.Join(storageDir, fmt.Sprintf("%s.csv", feedName))
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db := db{
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dbPath: dbPath,
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seenLinks: map[string]struct{}{},
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}
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f, err := os.Open(dbPath)
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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log.Info("db file does not exist, will be created", "feed", feedName, "path", dbPath)
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return &db, nil
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}
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return nil, err
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}
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defer f.Close()
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reader := csv.NewReader(f)
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records, err := reader.ReadAll()
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if err != nil {
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return nil, fmt.Errorf("failed to parse csv, path:%v, error:%w", dbPath, err)
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}
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for _, rec := range records {
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var recStatus Status = Status(rec[2])
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if recStatus == Sent || recStatus == Filtered {
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db.seenLinks[rec[1]] = struct{}{}
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}
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}
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return &db, nil
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}
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func (d *db) Filter(entries []parser.FeedEntry) ([]parser.FeedEntry, error) {
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var filteredEntries []parser.FeedEntry
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for _, entry := range entries {
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if _, ok := d.seenLinks[entry.Link]; !ok {
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filteredEntries = append(filteredEntries, entry)
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d.seenLinks[entry.Link] = struct{}{}
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}
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}
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return filteredEntries, nil
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}
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func (d *db) Save(records []Record) error {
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if len(records) == 0 {
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return nil
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}
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f, err := os.OpenFile(d.dbPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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return err
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}
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defer f.Close()
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csvw := csv.NewWriter(f)
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defer csvw.Flush()
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if d.IsNewFeed() {
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csvw.Write([]string{
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/* 1 */ "Date",
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/* 2 */ "Link",
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/* 3 */ "Status",
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/* 4 */ "Filter",
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/* 5 */ "Content",
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})
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}
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for _, r := range records {
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csvw.Write([]string{
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/* 1 */ r.Time.Format(TimeFormat),
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/* 2 */ r.FeedEntry.Link,
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/* 3 */ string(r.Status),
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/* 4 */ r.Filter,
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/* 5 */ fmt.Sprintf("<item>%s</item>", strings.ReplaceAll(r.FeedEntry.Content, "\n", " ")),
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})
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}
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return nil
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}
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