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| 1 | +import Foundation |
| 2 | +#if !COCOAPODS |
| 3 | +import Apollo |
| 4 | +#endif |
| 5 | +import SQLite3 |
| 6 | + |
| 7 | +public final class ApolloSQLiteDatabase: SQLiteDatabase { |
| 8 | + |
| 9 | + private final class DBContextToken: Sendable {} |
| 10 | + |
| 11 | + private var db: OpaquePointer? |
| 12 | + private let dbURL: URL |
| 13 | + |
| 14 | + private let dbQueue = DispatchQueue(label: "com.apollo.sqlite.database") |
| 15 | + private static let dbContextKey = DispatchSpecificKey<DBContextToken>() |
| 16 | + private let dbContextValue = DBContextToken() |
| 17 | + |
| 18 | + let SQLITE_TRANSIENT = unsafeBitCast(-1, to: sqlite3_destructor_type.self) |
| 19 | + |
| 20 | + public init(fileURL: URL) throws { |
| 21 | + self.dbURL = fileURL |
| 22 | + try openConnection() |
| 23 | + dbQueue.setSpecific(key: Self.dbContextKey, value: dbContextValue) |
| 24 | + } |
| 25 | + |
| 26 | + deinit { |
| 27 | + sqlite3_close(db) |
| 28 | + } |
| 29 | + |
| 30 | + // MARK: - Internal Helpers |
| 31 | + |
| 32 | + private func performSync<T>(_ block: () throws -> T) throws -> T { |
| 33 | + if DispatchQueue.getSpecific(key: Self.dbContextKey) === dbContextValue { |
| 34 | + return try block() |
| 35 | + } else { |
| 36 | + return try dbQueue.sync(execute: block) |
| 37 | + } |
| 38 | + } |
| 39 | + |
| 40 | + private func openConnection() throws { |
| 41 | + let flags = SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE | SQLITE_OPEN_FULLMUTEX | SQLITE_OPEN_URI |
| 42 | + if sqlite3_open_v2(dbURL.path, &db, flags, nil) != SQLITE_OK { |
| 43 | + throw SQLiteError.open(path: dbURL.path) |
| 44 | + } |
| 45 | + } |
| 46 | + |
| 47 | + private func rollbackTransaction() { |
| 48 | + sqlite3_exec(db, "ROLLBACK TRANSACTION", nil, nil, nil) |
| 49 | + } |
| 50 | + |
| 51 | + private func sqliteErrorMessage() -> String { |
| 52 | + return String(cString: sqlite3_errmsg(db)) |
| 53 | + } |
| 54 | + |
| 55 | + @discardableResult |
| 56 | + private func exec(_ sql: String, errorMessage: @autoclosure () -> String) throws -> Int32 { |
| 57 | + let result = sqlite3_exec(db, sql, nil, nil, nil) |
| 58 | + if result != SQLITE_OK { |
| 59 | + throw SQLiteError.execution(message: "\(errorMessage()): \(sqliteErrorMessage())") |
| 60 | + } |
| 61 | + return result |
| 62 | + } |
| 63 | + |
| 64 | + private func prepareStatement(_ sql: String, errorMessage: @autoclosure () -> String) throws -> OpaquePointer? { |
| 65 | + var stmt: OpaquePointer? |
| 66 | + if sqlite3_prepare_v2(db, sql, -1, &stmt, nil) != SQLITE_OK { |
| 67 | + throw SQLiteError.prepare(message: "\(errorMessage()): \(sqliteErrorMessage())") |
| 68 | + } |
| 69 | + return stmt |
| 70 | + } |
| 71 | + |
| 72 | + // MARK: - SQLiteDatabase Protocol |
| 73 | + |
| 74 | + public func createRecordsTableIfNeeded() throws { |
| 75 | + try performSync { |
| 76 | + let sql = """ |
| 77 | + CREATE TABLE IF NOT EXISTS "records" ( |
| 78 | + "_id" INTEGER, |
| 79 | + "key" TEXT UNIQUE, |
| 80 | + "record" TEXT, |
| 81 | + PRIMARY KEY("_id" AUTOINCREMENT) |
| 82 | + ); |
| 83 | + """ |
| 84 | + try exec(sql, errorMessage: "Failed to create 'records' database table") |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + public func selectRawRows(forKeys keys: Set<CacheKey>) throws -> [DatabaseRow] { |
| 89 | + guard !keys.isEmpty else { return [] } |
| 90 | + |
| 91 | + return try performSync { |
| 92 | + let placeholders = keys.map { _ in "?" }.joined(separator: ", ") |
| 93 | + let sql = """ |
| 94 | + SELECT \(Self.keyColumnName), \(Self.recordColumName) FROM \(Self.tableName) |
| 95 | + WHERE \(Self.keyColumnName) IN (\(placeholders)) |
| 96 | + """ |
| 97 | + |
| 98 | + let stmt = try prepareStatement(sql, errorMessage: "Failed to prepare select statement") |
| 99 | + defer { sqlite3_finalize(stmt) } |
| 100 | + |
| 101 | + for (index, key) in keys.enumerated() { |
| 102 | + sqlite3_bind_text(stmt, Int32(index + 1), key, -1, SQLITE_TRANSIENT) |
| 103 | + } |
| 104 | + |
| 105 | + var rows = [DatabaseRow]() |
| 106 | + var result: Int32 |
| 107 | + repeat { |
| 108 | + result = sqlite3_step(stmt) |
| 109 | + if result == SQLITE_ROW { |
| 110 | + let key = String(cString: sqlite3_column_text(stmt, 0)) |
| 111 | + let record = String(cString: sqlite3_column_text(stmt, 1)) |
| 112 | + rows.append(DatabaseRow(cacheKey: key, storedInfo: record)) |
| 113 | + } else if result != SQLITE_DONE { |
| 114 | + let errorMsg = String(cString: sqlite3_errmsg(db)) |
| 115 | + throw SQLiteError.step(message: "Failed to step raw row select: \(errorMsg)") |
| 116 | + } |
| 117 | + } while result != SQLITE_DONE |
| 118 | + |
| 119 | + |
| 120 | + return rows |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + public func addOrUpdate(records: [(cacheKey: CacheKey, recordString: String)]) throws { |
| 125 | + guard !records.isEmpty else { return } |
| 126 | + |
| 127 | + try performSync { |
| 128 | + let sql = """ |
| 129 | + INSERT INTO \(Self.tableName) (\(Self.keyColumnName), \(Self.recordColumName)) |
| 130 | + VALUES (?, ?) |
| 131 | + ON CONFLICT(\(Self.keyColumnName)) DO UPDATE SET \(Self.recordColumName) = excluded.\(Self.recordColumName) |
| 132 | + """ |
| 133 | + |
| 134 | + try exec("BEGIN TRANSACTION", errorMessage: "Failed to begin insert/update transaction") |
| 135 | + |
| 136 | + let stmt = try prepareStatement(sql, errorMessage: "Failed to prepare insert/update statement") |
| 137 | + defer { sqlite3_finalize(stmt) } |
| 138 | + |
| 139 | + for (key, record) in records { |
| 140 | + sqlite3_bind_text(stmt, 1, key, -1, SQLITE_TRANSIENT) |
| 141 | + sqlite3_bind_text(stmt, 2, record, -1, SQLITE_TRANSIENT) |
| 142 | + |
| 143 | + if sqlite3_step(stmt) != SQLITE_DONE { |
| 144 | + rollbackTransaction() |
| 145 | + throw SQLiteError.step(message: "Insert/update failed: \(sqliteErrorMessage())") |
| 146 | + } |
| 147 | + |
| 148 | + sqlite3_reset(stmt) |
| 149 | + sqlite3_clear_bindings(stmt) |
| 150 | + } |
| 151 | + |
| 152 | + do { |
| 153 | + try exec("COMMIT TRANSACTION", errorMessage: "Failed to commit transaction") |
| 154 | + } catch { |
| 155 | + rollbackTransaction() |
| 156 | + throw error |
| 157 | + } |
| 158 | + } |
| 159 | + } |
| 160 | + |
| 161 | + public func deleteRecord(for cacheKey: CacheKey) throws { |
| 162 | + try performSync { |
| 163 | + let sql = "DELETE FROM \(Self.tableName) WHERE \(Self.keyColumnName) = ?" |
| 164 | + let stmt = try prepareStatement(sql, errorMessage: "Failed to prepare delete statement") |
| 165 | + defer { sqlite3_finalize(stmt) } |
| 166 | + |
| 167 | + sqlite3_bind_text(stmt, 1, cacheKey, -1, SQLITE_TRANSIENT) |
| 168 | + if sqlite3_step(stmt) != SQLITE_DONE { |
| 169 | + throw SQLiteError.step(message: "Delete failed: \(sqliteErrorMessage())") |
| 170 | + } |
| 171 | + } |
| 172 | + } |
| 173 | + |
| 174 | + public func deleteRecords(matching pattern: CacheKey) throws { |
| 175 | + guard !pattern.isEmpty else { return } |
| 176 | + let wildcardPattern = "%\(pattern)%" |
| 177 | + |
| 178 | + try performSync { |
| 179 | + let sql = "DELETE FROM \(Self.tableName) WHERE \(Self.keyColumnName) LIKE ? COLLATE NOCASE" |
| 180 | + let stmt = try prepareStatement(sql, errorMessage: "Failed to prepare delete pattern statement") |
| 181 | + defer { sqlite3_finalize(stmt) } |
| 182 | + |
| 183 | + sqlite3_bind_text(stmt, 1, wildcardPattern, -1, SQLITE_TRANSIENT) |
| 184 | + if sqlite3_step(stmt) != SQLITE_DONE { |
| 185 | + throw SQLiteError.step(message: "Pattern delete failed: \(sqliteErrorMessage())") |
| 186 | + } |
| 187 | + } |
| 188 | + } |
| 189 | + |
| 190 | + public func clearDatabase(shouldVacuumOnClear: Bool) throws { |
| 191 | + try performSync { |
| 192 | + try exec("DELETE FROM \(Self.tableName)", errorMessage: "Failed to clear database") |
| 193 | + if shouldVacuumOnClear { |
| 194 | + try exec("VACUUM;", errorMessage: "Failed to vacuum database") |
| 195 | + } |
| 196 | + } |
| 197 | + } |
| 198 | + |
| 199 | + public func setJournalMode(mode: JournalMode) throws { |
| 200 | + try performSync { |
| 201 | + try exec("PRAGMA journal_mode = \(mode.rawValue);", errorMessage: "Failed to set journal mode") |
| 202 | + } |
| 203 | + } |
| 204 | +} |
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