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model.go
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model.go
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package model
import (
"database/sql"
"log"
"strings"
"sync"
"time"
"github.com/SlyMarbo/rss"
_ "github.com/mattn/go-sqlite3"
)
const (
sqlCreateFeed = `CREATE TABLE IF NOT EXISTS feed(
id INTEGER PRIMARY KEY,
title TEXT NOT NULL,
url TEXT NOT NULL,
filters TEXT,
UNIQUE (url, filters));`
sqlCreatePost = `CREATE TABLE IF NOT EXISTS post(
id INTEGER PRIMARY KEY,
feed INTEGER,
url TEXT NOT NULL,
title TEXT NOT NULL,
summary TEXT,
content TEXT,
read INTEGER,
date DATETIME DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY(feed) REFERENCES feed(id),
UNIQUE (url) ON CONFLICT IGNORE
);`
sqlNewFeed = `INSERT INTO feed(url, title, filters) VALUES(?, ?, ?);`
sqlNewPost = `INSERT INTO post(url, title, summary, content, read, feed) VALUES(?, ?, ?, ?, 0, ?);`
sqlGetUnreadPosts = `SELECT post.id, post.url, post.title, post.summary, post.content, post.date, feed.title
FROM post, feed WHERE read = 0 AND feed.id=post.feed ORDER BY post.date DESC, post.id ASC;`
sqlGetAllFeeds = `SELECT id, title, url, filters FROM feed;`
sqlMarkAllRead = `UPDATE post SET read = 1 WHERE read = 0 AND id <= ?;`
)
type RedMeFeed struct {
id int64
Filters []string
Feed *rss.Feed
}
type RedMePost struct {
Id int
Item *rss.Item
FeedTitle string
Date string
}
func NewRedMeFeed(url string, filters []string) (*RedMeFeed, error) {
feed := new(RedMeFeed)
openedFeed, err := rss.Fetch(url)
if err != nil {
return nil, err
}
feed.Feed = openedFeed
feed.Filters = filters
return feed, nil
}
type RedMeDB struct {
sync.RWMutex
db *sql.DB
}
func NewRedMeDBConn(path string) (*RedMeDB, error) {
log.Println("Connecting to DB at", path)
db, err := sql.Open("sqlite3", path)
if err != nil {
return nil, err
}
_, err = db.Exec(sqlCreateFeed)
if err != nil {
return nil, err
}
_, err = db.Exec(sqlCreatePost)
if err != nil {
return nil, err
}
log.Println("DB connection created")
return &RedMeDB{db: db}, nil
}
func (r *RedMeDB) AddFeed(f *RedMeFeed) error {
var filters string
if f.Filters == nil {
filters = ""
} else {
filters = strings.Join(f.Filters, ",")
}
r.Lock()
defer r.Unlock()
res, err := r.db.Exec(sqlNewFeed, f.Feed.UpdateURL, f.Feed.Title, filters)
if err != nil {
return err
}
id, err := res.LastInsertId()
if err != nil {
return err
}
f.id = id
return nil
}
func (r *RedMeDB) AddPost(f *RedMeFeed, i *rss.Item) error {
var err error
if isAddableItem(i, f.Filters) {
r.Lock()
_, err = r.db.Exec(sqlNewPost, i.Link, i.Title, i.Summary, i.Content, f.id)
r.Unlock()
}
return err
}
func isAddableItem(i *rss.Item, filters []string) bool {
if filters == nil {
return true
}
for _, filter := range filters {
if strings.Contains(strings.ToUpper(i.Title), strings.ToUpper(filter)) && !i.Read {
return true
}
}
return false
}
func (r *RedMeDB) GetAllUnreadPosts() ([]*RedMePost, error) {
rows, err := r.db.Query(sqlGetUnreadPosts)
if err != nil {
return nil, err
}
defer rows.Close()
l := make([]*RedMePost, 0)
i := new(RedMePost)
d := new(time.Time)
i.Item = new(rss.Item)
for rows.Next() {
err = rows.Scan(&i.Id, &i.Item.Link, &i.Item.Title, &i.Item.Summary, &i.Item.Content, &d, &i.FeedTitle)
if err != nil {
return nil, err
}
i.Date = d.Format("2006 Jan 2 15:04")
l = append(l, i)
i = new(RedMePost)
i.Item = new(rss.Item)
d = new(time.Time)
}
return l, nil
}
func (r *RedMeDB) GetAllFeeds() ([]*RedMeFeed, error) {
rows, err := r.db.Query(sqlGetAllFeeds)
if err != nil {
return nil, err
}
defer rows.Close()
f := make([]*RedMeFeed, 0)
e := new(RedMeFeed)
e.Feed = new(rss.Feed)
var rawFilters string
for rows.Next() {
err = rows.Scan(&e.id, &e.Feed.Title, &e.Feed.UpdateURL, &rawFilters)
e.Filters = nil
if rawFilters != "" {
e.Filters = strings.Split(",", rawFilters)
}
if err != nil {
return nil, err
}
f = append(f, e)
e = new(RedMeFeed)
e.Feed = new(rss.Feed)
}
return f, nil
}
func (r *RedMeDB) MarkAllPostsRead(id string) error {
r.Lock()
_, err := r.db.Exec(sqlMarkAllRead, id)
r.Unlock()
return err
}