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sqlite.go
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sqlite.go
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package store
import (
"database/sql"
"encoding/json"
"fmt"
"log"
"os/user"
"strings"
"time"
_ "github.com/mattn/go-sqlite3"
)
type SqliteMemoryStore struct {
db *sql.DB
}
func NewSqliteStore() *SqliteMemoryStore {
u, err := user.Current()
if err != nil {
panic("Could not determine home directory!")
}
uri := u.HomeDir + "/.rolodecks/rolodecks.sqlite"
db := ensureDatabasePresent(uri)
return &SqliteMemoryStore{db}
}
func ensureDatabasePresent(uri string) *sql.DB {
db, err := sql.Open("sqlite3", uri)
if err != nil {
panic(err)
}
db.SetMaxOpenConns(1)
s, err := db.Prepare(`CREATE TABLE IF NOT EXISTS setting (
key VARCHAR,
value VARCHAR,
PRIMARY KEY (key)
)`)
checkErrors(err, "Failed to create settings table DML")
_, err = s.Exec()
checkErrors(err, "Failed to create settings table")
s, err = db.Prepare(`CREATE TABLE IF NOT EXISTS document (
id INTEGER NOT NULL,
path VARCHAR,
created DATETIME,
last_modified DATETIME,
PRIMARY KEY (id)
)`)
checkErrors(err, "Failed to create documents table DML")
_, err = s.Exec()
checkErrors(err, "Failed to create documents table")
s, err = db.Prepare(`CREATE TABLE IF NOT EXISTS slide (
id INTEGER NOT NULL,
thumbnail_png BLOB,
slide INTEGER,
document_id INTEGER,
PRIMARY KEY (id),
FOREIGN KEY(document_id) REFERENCES document (id) on delete cascade
)`)
checkErrors(err, "Failed to create slides table DML")
_, err = s.Exec()
checkErrors(err, "Failed to create slides table")
s, err = db.Prepare(`CREATE VIRTUAL TABLE IF NOT EXISTS slide_content
using fts4(slide_id INTEGER, content TEXT)`)
checkErrors(err, "Failed to create slide content table DML")
_, err = s.Exec()
checkErrors(err, "Failed to create slide content table")
return db
}
func checkErrors(err error, message string) {
if err != nil {
panic(fmt.Sprintf("%s: %s", message, err))
}
}
func (s *SqliteMemoryStore) Search(query string) []SearchResult {
log.Printf("Searching for '%s'", query)
rows, err := s.db.Query(`
select
d.path, s.id as slide_id, s.thumbnail_png, s.slide as slide_no,
sc.content as search_content
from
slide_content sc, document d, slide s
where
sc.content match ?
and sc.slide_id = s.id
and s.document_id = d.id`, "'" + query + "*'")
checkErrors(err, "Failed to search for documents")
defer rows.Close()
searchResults := make([]SearchResult, 0)
for rows.Next() {
var path string
var slideId int
var thumbnailPng string
var slideNo int
var searchContent string
err = rows.Scan(&path, &slideId, &thumbnailPng, &slideNo, &searchContent)
checkErrors(err, "Failed to load column values")
log.Printf("Found document: %s, slide %s", path, slideNo)
startIndex := strings.Index(strings.ToLower(searchContent), strings.ToLower(query))
searchResults = append(searchResults, SearchResult{
fmt.Sprintf("%d", slideId),
slideNo,
path,
thumbnailPng,
SearchResultMatch{
searchContent,
startIndex,
len(query),
},
})
}
return searchResults
}
func (s *SqliteMemoryStore) GetDocumentPathForSlideId(slideId string) string {
rows, err := s.db.Query(
`select d.path from document d, slide s
where s.id = ? and d.id = s.document_id`, slideId)
checkErrors(err, "Failed to lookup document path")
defer rows.Close()
for rows.Next() {
var path string
err := rows.Scan(&path)
checkErrors(err, "Failed to retrieve document path")
return path
}
panic(fmt.Sprintf("Failed to find slide with id: %s", slideId))
}
func (s *SqliteMemoryStore) IsFileModified(path string, modifiedTime time.Time, fileSize int64) bool {
rows, err := s.db.Query(`select last_modified from document where path = ?`, path)
checkErrors(err, "Failed to load last modified time")
defer rows.Close()
if rows.Next() {
var dbLastModified time.Time
err := rows.Scan(&dbLastModified)
checkErrors(err, "Failed to load last modified time from database")
return modifiedTime.After(dbLastModified)
} else {
return true
}
}
func (s *SqliteMemoryStore) Save(document Document) {
log.Printf("Saving document: %s", document.Path)
tx, err := s.db.Begin()
checkErrors(err, "Failed to begin transaction")
_, err = tx.Exec(`delete from slide_content where slide_id in (
select s.id from slide s, document d
where s.document_id = d.id
and d.path = ?
)`, document.Path)
checkErrors(err, "Failed to delete slide content")
_, err = tx.Exec(`delete from document where path = ?`, document.Path)
checkErrors(err, "Failed to delete documents")
res, err := tx.Exec(`insert into document (path, created, last_modified)
values (?, ?, ?)`, document.Path, time.Now(), time.Now())
checkErrors(err, "Failed to insert document")
documentId, err := res.LastInsertId()
checkErrors(err, "Failed to get last insert id")
for _, slide := range document.Slides {
res, err = tx.Exec(`insert into slide (thumbnail_png, slide, document_id)
values (?, ?, ?)`, slide.ThumbnailBase64, slide.SlideNumber, documentId)
checkErrors(err, "Failed to insert slide")
slideId, err := res.LastInsertId()
checkErrors(err, "Failed to get slide id")
_, err = tx.Exec(`insert into slide_content (slide_id, content) values (?, ?)`,
slideId, slide.TextContent)
checkErrors(err, "Failed to index slide text content")
}
err = tx.Commit()
checkErrors(err, "Failed to commit transaction")
}
const IndexPathsSettingKey = "index_paths"
func (s *SqliteMemoryStore) GetIndexPaths() []string {
var paths []string
s.getSetting(IndexPathsSettingKey, &paths)
return paths
}
func (s *SqliteMemoryStore) getSetting(settingKey string, value interface{}) {
rows, err := s.db.Query(`select value from setting where key = ?`, settingKey)
defer rows.Close()
if rows.Next() {
var jsonStr []byte
err = rows.Scan(&jsonStr)
checkErrors(err, "Failed to load setting")
err = json.Unmarshal(jsonStr, value)
checkErrors(err, "Failed to deseriailize setting")
}
}
func (s *SqliteMemoryStore) SetIndexPaths(paths []string) {
s.setSetting(IndexPathsSettingKey, &paths)
}
func (s *SqliteMemoryStore) setSetting(settingKey string, value interface{}) {
tx, err := s.db.Begin()
_, err = tx.Exec(`delete from setting where key = ?`, settingKey)
checkErrors(err, "Failed to delete existing setting")
serialized, err := json.Marshal(value)
checkErrors(err, "Failed to serialize setting")
_, err = tx.Exec(`insert into setting (key, value) values (?, ?)`, settingKey, serialized)
checkErrors(err, "Failed to insert setting")
err = tx.Commit()
checkErrors(err, "Failed to commit transaction")
}