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|
// database storage
package dbstore
import (
"context"
db_sql "database/sql"
"embed"
"fmt"
_ "github.com/mattn/go-sqlite3"
"github.com/pablotron/cvez/cpedict"
"github.com/pablotron/cvez/cpematch"
)
//go:embed sql
var sqlFs embed.FS
// sqlite3 backing store
type DbStore struct {
db *db_sql.DB
}
// Open database.
//
// This function is called by Open(). It is a separate package-private
// function to make Open() easier to test.
func openFull(dbType, path string) (DbStore, error) {
var r DbStore
// init db
if db, err := db_sql.Open(dbType, path); err != nil {
return r, err
} else {
// save handle
r.db = db
return r, nil
}
}
// Open database
func Open(path string) (DbStore, error) {
return openFull("sqlite3", path)
}
// initialized database version
const initDbVersion = 314159
func (me DbStore) isInitialized(ctx context.Context) (bool, error) {
sql := "PRAGMA user_version;"
// get version
var version int32
if err := me.db.QueryRowContext(ctx, sql).Scan(&version); err != nil {
return false, err
}
// return result
return (version == initDbVersion), nil
}
// initialize database
func (me DbStore) Init(ctx context.Context) error {
if inited, err := me.isInitialized(ctx); err != nil {
return err
} else if inited {
// already initialized, return success
return nil
}
// read init query
sql, err := sqlFs.ReadFile("sql/init.sql")
if err != nil {
return err
}
// exec init query, return result
_, err = me.db.ExecContext(ctx, string(sql))
return err
}
// get single query from embedded filesystem
func getQuery(id string) (string, error) {
// read query
if data, err := sqlFs.ReadFile(fmt.Sprintf("sql/%s.sql", id)); err != nil {
return "", err
} else {
// return query
return string(data), nil
}
}
// return query map
func getQueries(ids []string) (map[string]string, error) {
r := make(map[string]string)
for _, id := range(ids) {
// read query
if sql, err := getQuery(id); err != nil {
return r, fmt.Errorf("%s: %s", id, err.Error())
} else {
// save query
r[id] = sql
}
}
// return success
return r, nil
}
var addCpeDictionaryQueryIds = []string {
"cpe/insert",
"cpe/insert-title",
"cpe/insert-ref",
}
// import CPE dictionary
func (me DbStore) AddCpeDictionary(ctx context.Context, dict cpedict.Dictionary) error {
// lazy-init db
if err := me.Init(ctx); err != nil {
return err
}
// build query map
queries, err := getQueries(addCpeDictionaryQueryIds)
if err != nil {
return err
}
// begin context
tx, err := me.db.BeginTx(ctx, nil)
if err != nil {
return err
}
// build statements
sts := make(map[string]*db_sql.Stmt)
for id, sql := range(queries) {
if st, err := tx.PrepareContext(ctx, sql); err != nil {
return err
} else {
sts[id] = st
defer sts[id].Close()
}
}
// add items
for _, item := range(dict.Items) {
// add cpe
rs, err := sts["cpe/insert"].ExecContext(ctx, item.CpeUri, item.Cpe23Item.Name)
if err != nil {
return err
}
// get last row ID
id, err := rs.LastInsertId()
if err != nil {
return err
}
// add titles
for _, title := range(item.Titles) {
_, err := sts["cpe/insert-title"].ExecContext(ctx, id, title.Lang, title.Text)
if err != nil {
return err
}
}
// add refs
for _, ref := range(item.References) {
_, err := sts["cpe/insert-ref"].ExecContext(ctx, id, ref.Href, ref.Text)
if err != nil {
return err
}
}
}
// commit changes, return result
return tx.Commit()
}
// search CPEs
func (me DbStore) CpeSearch(
ctx context.Context,
searchType CpeSearchType,
s string,
) ([]CpeSearchRow, error) {
var r []CpeSearchRow
// lazy-init db
if err := me.Init(ctx); err != nil {
return r, err
}
// get query
sql, err := getQuery(searchType.String())
if err != nil {
return r, err
}
// exec search query
rows, err := me.db.QueryContext(ctx, sql, db_sql.Named("q", s))
if err != nil {
return r, err
}
// walk results
for rows.Next() {
if sr, err := unmarshalCpeSearchRow(rows); err != nil {
// return error
return r, err
} else {
// append to results
r = append(r, sr)
}
}
// close rows
// FIXME: is this correct? i am following the example from the
// database/sql documentation, but it is messy and it seems
// counterintuitive to close the row set and then do an additional
// test for iteration errors...
if err = rows.Close(); err != nil {
return r, err
}
// check for iteration errors
if err = rows.Err(); err != nil {
return r, err
}
// return success
return r, nil
}
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