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db.go
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db.go
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package main
import (
"context"
"errors"
"fmt"
"log"
"net/url"
"os"
"time"
"github.com/blevesearch/bleve/v2"
"github.com/gorilla/sessions"
"github.com/jackc/pgx/v5/pgxpool"
)
type app struct {
db *pgxpool.Pool
store *sessions.CookieStore
}
var Index bleve.Index
func (s *app) dbInit() error {
var err error
s.db, err = pgxpool.New(context.Background(), os.Getenv("DATABASE_URL"))
if err != nil {
fmt.Fprintf(os.Stderr, "Unable to create connection pool: %v\n", err)
os.Exit(1)
}
var greeting string
err = s.db.QueryRow(context.Background(), "select 'Database Init!'").Scan(&greeting)
if err != nil {
fmt.Fprintf(os.Stderr, "QueryRow failed: %v\n", err)
os.Exit(1)
}
index, err := bleve.Open("index.bleve")
if err == bleve.ErrorIndexPathDoesNotExist {
log.Println("Creating new index")
mapping := bleve.NewIndexMapping()
index, err = bleve.New("index.bleve", mapping)
if err != nil {
return err
}
} else if err != nil {
return err
}
Index = index
fmt.Println(greeting)
return nil
}
func (s *app) closeDB() {
s.db.Close()
}
func (s *app) editInDB(id int64, tags []string, title, content string, protected bool) error {
tag, err := s.db.Exec(context.Background(), "update notes set tags = $1, title = $2, content = $3, protected = $4 where id = $5", tags, title, content, protected, id)
if err != nil {
return err
}
if !tag.Update() {
return errors.New("Not update")
}
return nil
}
func (s *app) insertDB(tags []string, title, content string, protected bool) (int, error) {
decodedContent, err := url.QueryUnescape(content)
if err != nil {
return 0, err
}
var id int
err = s.db.QueryRow(context.Background(), "insert into notes(TITLE, TAGS, CONTENT, PROTECTED) values($1, $2, $3, $4) RETURNING id", &title, &tags, &decodedContent, &protected).Scan(&id)
if err != nil {
return 0, err
}
return id, nil
}
func (s *app) getNotesFromDB(page int, protected bool) ([]notes, error) {
var n []notes
offset := page * 50
rows, err := s.db.Query(context.Background(), "select id, title, created, tags from notes where protected=$1 order by created desc limit 50 offset $2", protected, offset)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var singlenote notes
var created time.Time
err = rows.Scan(&singlenote.ID, &singlenote.Title, &created, &singlenote.Tags)
if err != nil {
return nil, err
}
loc, _ := time.LoadLocation("America/New_York")
singlenote.Created = created.In(loc).Format(time.RFC822)
n = append(n, singlenote)
}
if err = rows.Err(); err != nil {
return nil, err
}
return n, nil
}
func (s *app) getSingleNote(id int64) (notes, error) {
var note notes
var created time.Time
err := s.db.QueryRow(context.Background(), "select title, created, tags, content, protected from notes where id=$1", id).Scan(¬e.Title, &created, ¬e.Tags, ¬e.Content, ¬e.Protected)
if err != nil {
return note, err
}
loc, _ := time.LoadLocation("America/New_York")
note.Created = created.In(loc).Format(time.RFC822)
return note, nil
}
func (s *app) deleteNoteFromDB(id int64) error {
tag, err := s.db.Exec(context.Background(), "delete from notes where id = $1", id)
if err != nil {
return err
}
if !tag.Delete() {
return errors.New("Not delete")
}
return nil
}
func (s *app) searchDB(term string) ([]notes, error) {
var n []notes
rows, err := s.db.Query(context.Background(), "select * from search_notes($1)", term)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var singlenote notes
var created time.Time
var rank any
// id integer, title text, tags text[], created timestamp with time zone, content text, rank real
err = rows.Scan(&singlenote.ID, &singlenote.Title, &singlenote.Tags, &created, &singlenote.Content, &rank)
if err != nil {
return nil, err
}
loc, _ := time.LoadLocation("America/New_York")
singlenote.Created = created.In(loc).Format(time.RFC822)
n = append(n, singlenote)
}
if err = rows.Err(); err != nil {
return nil, err
}
return n, nil
}
func (s *app) tags() ([]string, error) {
var tags []string
rows, err := s.db.Query(context.Background(), "select distinct trim(unnest(tags)) as tags from notes where tags is not null and protected=false")
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var tag string
err = rows.Scan(&tag)
if err != nil {
return nil, err
}
tags = append(tags, tag)
}
if err = rows.Err(); err != nil {
return nil, err
}
return tags, nil
}
func (s *app) tagNotes(tag string) ([]notes, error) {
var n []notes
rows, err := s.db.Query(context.Background(), "select id, title, created, tags from notes where $1=ANY(tags)", tag)
if err != nil {
return nil, err
}
defer rows.Close()
for rows.Next() {
var singlenote notes
var created time.Time
err = rows.Scan(&singlenote.ID, &singlenote.Title, &created, &singlenote.Tags)
if err != nil {
return nil, err
}
loc, _ := time.LoadLocation("America/New_York")
singlenote.Created = created.In(loc).Format(time.RFC822)
n = append(n, singlenote)
}
if err = rows.Err(); err != nil {
return nil, err
}
return n, nil
}