zeus
79 lines
2.7 KiB
Swift
79 lines
2.7 KiB
Swift
import XCTest
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import GRDB
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class DatabasePoolReadOnlyTests: GRDBTestCase {
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func testOpenReadOnlyMissingDatabase() throws {
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dbConfiguration.readonly = true
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do {
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_ = try makeDatabasePool()
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} catch let error as DatabaseError {
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XCTAssertEqual(error.resultCode, .SQLITE_CANTOPEN)
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}
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}
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func testConcurrentRead() throws {
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let databaseFileName = "db.sqlite"
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// Create a non-WAL database:
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do {
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let dbQueue = try makeDatabaseQueue(filename: databaseFileName)
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try dbQueue.inDatabase { db in
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try db.execute(sql: "CREATE TABLE items (id INTEGER PRIMARY KEY)")
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for _ in 0..<3 {
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try db.execute(sql: "INSERT INTO items (id) VALUES (NULL)")
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}
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}
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}
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// Open a read-only pool on that database:
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dbConfiguration.readonly = true
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let dbPool = try makeDatabasePool(filename: databaseFileName)
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// Make sure the database is not in WAL mode
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let mode = try dbPool.read { db in
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try String.fetchOne(db, sql: "PRAGMA journal_mode")!
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}
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XCTAssertNotEqual(mode.lowercased(), "wal")
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// Block 1 Block 2
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// SELECT * FROM items SELECT * FROM items
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// step step
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// >
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let s1 = DispatchSemaphore(value: 0)
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// step
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// <
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let s2 = DispatchSemaphore(value: 0)
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// step step
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// step end
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// end
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let block1 = { () in
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try! dbPool.read { db in
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let cursor = try Row.fetchCursor(db, sql: "SELECT * FROM items")
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XCTAssertTrue(try cursor.next() != nil)
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s1.signal()
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_ = s2.wait(timeout: .distantFuture)
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XCTAssertTrue(try cursor.next() != nil)
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XCTAssertTrue(try cursor.next() != nil)
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XCTAssertTrue(try cursor.next() == nil)
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}
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}
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let block2 = { () in
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try! dbPool.read { db in
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let cursor = try Row.fetchCursor(db, sql: "SELECT * FROM items")
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XCTAssertTrue(try cursor.next() != nil)
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_ = s1.wait(timeout: .distantFuture)
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XCTAssertTrue(try cursor.next() != nil)
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s2.signal()
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XCTAssertTrue(try cursor.next() != nil)
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XCTAssertTrue(try cursor.next() == nil)
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}
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}
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let blocks = [block1, block2]
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DispatchQueue.concurrentPerform(iterations: blocks.count) { index in
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blocks[index]()
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}
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}
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}
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