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/*
Copyright (c) 2019 Ben Morrison (gbmor)
This file is part of Getwtxt.
Getwtxt is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Getwtxt is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Getwtxt. If not, see <https://www.gnu.org/licenses/>.
*/
package svc // import "git.sr.ht/~gbmor/getwtxt/svc"
import (
"database/sql"
"net"
"time"
"git.sr.ht/~gbmor/getwtxt/registry"
_ "github.com/mattn/go-sqlite3" // for the sqlite3 driver
)
// Wrapper containing a SQLite database connection,
// along with two prepared statements for pushing
// and pulling via said connection.
type dbSqlite struct {
db *sql.DB
pullStmt *sql.Stmt
pushStmt *sql.Stmt
}
// Initializes a SQLite database.
func initSqlite() *dbSqlite {
confObj.Mu.RLock()
dbpath := confObj.DBPath
confObj.Mu.RUnlock()
lite, err := sql.Open("sqlite3", dbpath)
errFatal("Error opening sqlite3 DB: ", err)
errFatal("", lite.Ping())
_, err = lite.Exec("CREATE TABLE IF NOT EXISTS getwtxt (id INTEGER PRIMARY KEY, urlKey TEXT, isUser BOOL, dataKey TEXT, data BLOB)")
errFatal("Error preparing sqlite3 DB: ", err)
push, err := lite.Prepare("INSERT OR REPLACE INTO getwtxt (urlKey, isUser, dataKey, data) VALUES(?, ?, ?, ?)")
errFatal("", err)
pull, err := lite.Prepare("SELECT * FROM getwtxt")
errFatal("", err)
return &dbSqlite{
db: lite,
pushStmt: push,
pullStmt: pull,
}
}
// Commits data from memory to a SQLite database intermittently.
func (lite *dbSqlite) push() error {
if err := lite.db.Ping(); err != nil {
lite = initSqlite()
}
tx, err := lite.db.Begin()
errLog("", err)
txst := tx.Stmt(lite.pushStmt)
twtxtCache.Mu.RLock()
defer twtxtCache.Mu.RUnlock()
for i, e := range twtxtCache.Users {
e.Mu.RLock()
_, err = txst.Exec(i, true, "nickname", e.Nick)
errLog("", err)
_, err = txst.Exec(i, true, "lastmodified", e.LastModified)
errLog("", err)
_, err = txst.Exec(i, true, "uip", e.IP)
errLog("", err)
_, err = txst.Exec(i, true, "date", e.Date)
errLog("", err)
for k, v := range e.Status {
_, err = txst.Exec(i, true, k.Format(time.RFC3339), v)
errLog("", err)
}
e.Mu.RUnlock()
}
for _, e := range remoteRegistries.List {
_, err = txst.Exec(e, false, "REMOTE REGISTRY", "NULL")
errLog("", err)
}
err = tx.Commit()
if err != nil {
errLog("", tx.Rollback())
return err
}
return nil
}
// Retrieves stored data from a SQLite database on startup.
func (lite *dbSqlite) pull() {
errLog("Error pinging sqlite DB: ", lite.db.Ping())
rows, err := lite.pullStmt.Query()
errLog("", err)
defer func(rows *sql.Rows) {
errLog("Error while finalizing DB Pull: ", rows.Close())
}(rows)
twtxtCache.Mu.Lock()
defer twtxtCache.Mu.Unlock()
for rows.Next() {
var uid int
var urls string
var isUser bool
var dataKey string
var dBlob []byte
errLog("", rows.Scan(&uid, &urls, &isUser, &dataKey, &dBlob))
if !isUser {
remoteRegistries.List = append(remoteRegistries.List, urls)
continue
}
user := registry.NewUser()
if _, ok := twtxtCache.Users[urls]; ok {
user = twtxtCache.Users[urls]
}
user.Mu.Lock()
switch dataKey {
case "nickname":
user.Nick = string(dBlob)
case "uip":
user.IP = net.ParseIP(string(dBlob))
case "date":
user.Date = string(dBlob)
case "lastmodified":
user.LastModified = string(dBlob)
default:
thetime, err := time.Parse(time.RFC3339, dataKey)
errLog("While pulling statuses from SQLite: ", err)
user.Status[thetime] = string(dBlob)
}
twtxtCache.Users[urls] = user
user.Mu.Unlock()
}
remoteRegistries.List = dedupe(remoteRegistries.List)
}
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