152 lines
2.6 KiB
Go
152 lines
2.6 KiB
Go
package main
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import (
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"database/sql"
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_ "embed"
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"fmt"
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"sync"
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_ "github.com/ncruces/go-sqlite3/driver"
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_ "github.com/ncruces/go-sqlite3/embed"
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)
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//go:embed db/schema.sql
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var schemaSQL string
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var (
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db *sql.DB
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dbMu sync.Mutex
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)
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func openDatabase() (*sql.DB, error) {
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dbMu.Lock()
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defer dbMu.Unlock()
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if db != nil {
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return db, nil
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}
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conn, err := sql.Open("sqlite3", ":memory:")
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if err != nil {
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return nil, fmt.Errorf("open database: %w", err)
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}
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if _, err := conn.Exec(schemaSQL); err != nil {
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conn.Close()
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return nil, fmt.Errorf("init schema: %w", err)
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}
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db = conn
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return db, nil
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}
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func closeDatabase() error {
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dbMu.Lock()
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defer dbMu.Unlock()
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if db == nil {
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return nil
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}
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err := db.Close()
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db = nil
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return err
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}
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func getDatabase() *sql.DB {
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dbMu.Lock()
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defer dbMu.Unlock()
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return db
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}
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func serializeDatabaseBytes() ([]byte, error) {
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dbMu.Lock()
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defer dbMu.Unlock()
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if db == nil {
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return nil, fmt.Errorf("database not initialized")
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}
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var data []byte
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err := db.QueryRow("SELECT quote(readfile('.'))").Scan(&data)
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if err != nil {
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rows, err := db.Query("SELECT name, sql FROM sqlite_master WHERE type='table'")
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if err != nil {
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return nil, fmt.Errorf("query schema: %w", err)
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}
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defer rows.Close()
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return exportDatabaseDump()
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}
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return data, nil
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}
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func exportDatabaseDump() ([]byte, error) {
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if db == nil {
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return nil, fmt.Errorf("database not initialized")
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}
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var dump string
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dump += schemaSQL + "\n"
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tables := []string{
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"did_documents", "verification_methods", "credentials",
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"key_shares", "accounts", "ucan_tokens", "ucan_revocations",
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"sessions", "services", "grants", "delegations", "sync_checkpoints",
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}
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for _, table := range tables {
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rows, err := db.Query(fmt.Sprintf("SELECT * FROM %s", table))
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if err != nil {
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continue
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}
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cols, err := rows.Columns()
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if err != nil {
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rows.Close()
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continue
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}
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values := make([]interface{}, len(cols))
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valuePtrs := make([]interface{}, len(cols))
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for i := range values {
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valuePtrs[i] = &values[i]
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}
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for rows.Next() {
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if err := rows.Scan(valuePtrs...); err != nil {
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continue
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}
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dump += fmt.Sprintf("-- Row from %s\n", table)
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}
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rows.Close()
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}
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return []byte(dump), nil
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}
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func loadDatabaseFromBytes(data []byte) error {
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dbMu.Lock()
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defer dbMu.Unlock()
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if db != nil {
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db.Close()
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}
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conn, err := sql.Open("sqlite3", ":memory:")
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if err != nil {
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return fmt.Errorf("open database: %w", err)
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}
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if _, err := conn.Exec(schemaSQL); err != nil {
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conn.Close()
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return fmt.Errorf("init schema: %w", err)
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}
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db = conn
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return nil
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}
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