592 lines
26 KiB
Objective-C
592 lines
26 KiB
Objective-C
//
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// HttpdnsNWHTTPClient_StateMachineTests.m
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// AlicloudHttpDNSTests
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//
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// @author Created by Claude Code on 2025-11-01
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// Copyright © 2025 alibaba-inc.com. All rights reserved.
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//
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// 状态机测试 - 包含状态机与异常场景 (Q) 测试组
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// 测试总数：17 个（Q:17）
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//
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#import "HttpdnsNWHTTPClientTestBase.h"
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@interface HttpdnsNWHTTPClient_StateMachineTests : HttpdnsNWHTTPClientTestBase
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@end
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@implementation HttpdnsNWHTTPClient_StateMachineTests
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#pragma mark - Q. 状态机与异常场景测试
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// Q1.1 池溢出时LRU移除策略验证
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- (void)testStateMachine_PoolOverflowLRU_RemovesOldestByLastUsedDate {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 需要并发创建5个连接（串行请求会复用）
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NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray array];
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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// 并发发起5个请求
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for (NSInteger i = 0; i < 5; i++) {
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XCTestExpectation *expectation = [self expectationWithDescription:[NSString stringWithFormat:@"Request %ld", (long)i]];
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[expectations addObject:expectation];
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dispatch_async(queue, ^{
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NSError *error = nil;
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// 使用 /delay/2 确保所有请求同时在飞行中，强制创建多个连接
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/delay/2"
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userAgent:[NSString stringWithFormat:@"Request%ld", (long)i]
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timeout:15.0
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error:&error];
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[expectation fulfill];
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});
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[NSThread sleepForTimeInterval:0.05]; // 小间隔避免完全同时启动
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}
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[self waitForExpectations:expectations timeout:20.0];
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// 等待所有连接归还
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[NSThread sleepForTimeInterval:1.0];
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// 验证：池大小 ≤ 4（LRU移除溢出部分）
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NSUInteger poolCount = [self.client connectionPoolCountForKey:poolKey];
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XCTAssertLessThanOrEqual(poolCount, 4,
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@"Pool should enforce max 4 connections (LRU)");
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// 验证：创建了多个连接
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XCTAssertGreaterThanOrEqual(self.client.connectionCreationCount, 3,
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@"Should create multiple concurrent connections");
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}
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// Q2.1 快速连续请求不产生重复连接（间接验证双重归还防护）
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- (void)testAbnormal_RapidSequentialRequests_NoDuplicates {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 快速连续发起10个请求（测试连接归还的幂等性）
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for (NSInteger i = 0; i < 10; i++) {
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NSError *error = nil;
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HttpdnsNWHTTPClientResponse *response = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"RapidTest"
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timeout:15.0
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error:&error];
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XCTAssertNotNil(response);
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}
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// 等待连接归还
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[NSThread sleepForTimeInterval:1.0];
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// 验证：池中最多1个连接（因为串行请求复用同一连接）
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NSUInteger poolCount = [self.client connectionPoolCountForKey:poolKey];
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XCTAssertLessThanOrEqual(poolCount, 1,
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@"Pool should have at most 1 connection (rapid sequential reuse)");
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// 验证：创建次数应该是1（所有请求复用同一连接）
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XCTAssertEqual(self.client.connectionCreationCount, 1,
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@"Should create only 1 connection for sequential requests");
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}
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// Q2.2 不同端口请求不互相污染池
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- (void)testAbnormal_DifferentPorts_IsolatedPools {
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[self.client resetPoolStatistics];
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NSString *poolKey11080 = @"127.0.0.1:11080:tcp";
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NSString *poolKey11443 = @"127.0.0.1:11443:tls";
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// 向端口11080发起请求
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NSError *error1 = nil;
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HttpdnsNWHTTPClientResponse *response1 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"Port11080"
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timeout:15.0
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error:&error1];
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XCTAssertNotNil(response1);
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// 向端口11443发起请求
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NSError *error2 = nil;
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HttpdnsNWHTTPClientResponse *response2 = [self.client performRequestWithURLString:@"https://127.0.0.1:11443/get"
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userAgent:@"Port11443"
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timeout:15.0
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error:&error2];
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XCTAssertNotNil(response2);
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// 等待连接归还
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[NSThread sleepForTimeInterval:0.5];
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// 验证：两个池各自有1个连接
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XCTAssertEqual([self.client connectionPoolCountForKey:poolKey11080], 1,
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@"Port 11080 pool should have 1 connection");
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XCTAssertEqual([self.client connectionPoolCountForKey:poolKey11443], 1,
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@"Port 11443 pool should have 1 connection");
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// 验证：总共2个连接（池完全隔离）
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XCTAssertEqual([self.client totalConnectionCount], 2,
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@"Total should be 2 (one per pool)");
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}
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// Q3.1 池大小不变式：任何时候池大小都不超过限制
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- (void)testInvariant_PoolSize_NeverExceedsLimit {
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[self.client resetPoolStatistics];
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// 快速连续发起20个请求到同一端点
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for (NSInteger i = 0; i < 20; i++) {
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NSError *error = nil;
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"InvariantTest"
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timeout:15.0
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error:&error];
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}
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// 等待所有连接归还
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[NSThread sleepForTimeInterval:1.5];
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// 验证：每个池的大小不超过4
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NSArray<NSString *> *allKeys = [self.client allConnectionPoolKeys];
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for (NSString *key in allKeys) {
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NSUInteger poolCount = [self.client connectionPoolCountForKey:key];
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XCTAssertLessThanOrEqual(poolCount, 4,
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@"Pool %@ size should never exceed 4 (actual: %lu)",
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key, (unsigned long)poolCount);
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}
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// 验证：总连接数也不超过4（因为只有一个池）
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XCTAssertLessThanOrEqual([self.client totalConnectionCount], 4,
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@"Total connections should not exceed 4");
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}
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// Q3.3 无重复连接不变式：并发请求不产生重复
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- (void)testInvariant_NoDuplicates_ConcurrentRequests {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray array];
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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// 并发发起15个请求（可能复用连接）
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for (NSInteger i = 0; i < 15; i++) {
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XCTestExpectation *expectation = [self expectationWithDescription:[NSString stringWithFormat:@"Request %ld", (long)i]];
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[expectations addObject:expectation];
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dispatch_async(queue, ^{
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NSError *error = nil;
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"ConcurrentTest"
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timeout:15.0
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error:&error];
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[expectation fulfill];
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});
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}
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[self waitForExpectations:expectations timeout:30.0];
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// 等待连接归还
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[NSThread sleepForTimeInterval:1.0];
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// 验证：池大小 ≤ 4（不变式）
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NSUInteger poolCount = [self.client connectionPoolCountForKey:poolKey];
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XCTAssertLessThanOrEqual(poolCount, 4,
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@"Pool should not have duplicates (max 4 connections)");
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// 验证：创建的连接数合理（≤15，因为可能有复用）
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XCTAssertLessThanOrEqual(self.client.connectionCreationCount, 15,
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@"Should not create excessive connections");
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}
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// Q4.1 边界条件：恰好30秒后连接过期
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- (void)testBoundary_Exactly30Seconds_ConnectionExpired {
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if (getenv("SKIP_SLOW_TESTS")) {
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return;
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}
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[self.client resetPoolStatistics];
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// 第一个请求
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NSError *error1 = nil;
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HttpdnsNWHTTPClientResponse *response1 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"InitialRequest"
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timeout:15.0
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error:&error1];
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XCTAssertNotNil(response1);
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// 等待恰好30.5秒（超过30秒过期时间）
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[NSThread sleepForTimeInterval:30.5];
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// 第二个请求：应该创建新连接（旧连接已过期）
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NSError *error2 = nil;
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HttpdnsNWHTTPClientResponse *response2 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"AfterExpiry"
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timeout:15.0
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error:&error2];
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XCTAssertNotNil(response2);
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// 验证：创建了2个连接（旧连接过期，无法复用）
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XCTAssertEqual(self.client.connectionCreationCount, 2,
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@"Should create 2 connections (first expired after 30s)");
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XCTAssertEqual(self.client.connectionReuseCount, 0,
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@"Should not reuse expired connection");
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}
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// Q4.2 边界条件：29秒内连接未过期
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- (void)testBoundary_Under30Seconds_ConnectionNotExpired {
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[self.client resetPoolStatistics];
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// 第一个请求
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NSError *error1 = nil;
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HttpdnsNWHTTPClientResponse *response1 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"InitialRequest"
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timeout:15.0
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error:&error1];
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XCTAssertNotNil(response1);
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// 等待29秒（未到30秒过期时间）
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[NSThread sleepForTimeInterval:29.0];
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// 第二个请求：应该复用连接
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NSError *error2 = nil;
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HttpdnsNWHTTPClientResponse *response2 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"BeforeExpiry"
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timeout:15.0
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error:&error2];
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XCTAssertNotNil(response2);
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// 验证：只创建了1个连接（复用了）
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XCTAssertEqual(self.client.connectionCreationCount, 1,
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@"Should create only 1 connection (reused within 30s)");
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XCTAssertEqual(self.client.connectionReuseCount, 1,
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@"Should reuse connection within 30s");
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}
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// Q4.3 边界条件：恰好4个连接全部保留
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- (void)testBoundary_ExactlyFourConnections_AllKept {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 并发发起4个请求（使用延迟确保同时在飞行中，创建4个独立连接）
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NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray array];
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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for (NSInteger i = 0; i < 4; i++) {
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XCTestExpectation *expectation = [self expectationWithDescription:
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[NSString stringWithFormat:@"Request %ld", (long)i]];
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[expectations addObject:expectation];
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dispatch_async(queue, ^{
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NSError *error = nil;
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// 使用 /delay/2 确保所有请求同时在飞行中
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/delay/2"
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userAgent:[NSString stringWithFormat:@"Request%ld", (long)i]
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timeout:15.0
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error:&error];
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[expectation fulfill];
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});
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[NSThread sleepForTimeInterval:0.05]; // 小间隔避免完全同时启动
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}
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[self waitForExpectations:expectations timeout:20.0];
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// 等待连接归还
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[NSThread sleepForTimeInterval:1.0];
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// 验证：池恰好有4个连接（全部保留）
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NSUInteger poolCount = [self.client connectionPoolCountForKey:poolKey];
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XCTAssertEqual(poolCount, 4,
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@"Pool should keep all 4 connections (not exceeding limit)");
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// 验证：恰好创建4个连接
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XCTAssertEqual(self.client.connectionCreationCount, 4,
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@"Should create exactly 4 connections");
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}
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// Q1.2 正常状态序列验证
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- (void)testStateMachine_NormalSequence_StateTransitionsCorrect {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 第1步：创建并使用连接 (CREATING → IN_USE → IDLE)
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HttpdnsNWHTTPClientResponse *response1 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"StateTest"
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timeout:15.0
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error:nil];
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XCTAssertNotNil(response1, @"First request should succeed");
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[NSThread sleepForTimeInterval:1.0]; // 等待归还
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// 验证：池中有1个连接
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XCTAssertEqual([self.client connectionPoolCountForKey:poolKey], 1,
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@"Connection should be in pool");
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// 第2步：复用连接 (IDLE → IN_USE → IDLE)
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HttpdnsNWHTTPClientResponse *response2 = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"StateTest"
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timeout:15.0
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error:nil];
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XCTAssertNotNil(response2, @"Second request should reuse connection");
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// 验证：复用计数增加
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XCTAssertEqual(self.client.connectionReuseCount, 1,
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@"Should have reused connection once");
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}
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// Q1.3 inUse 标志维护验证
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- (void)testStateMachine_InUseFlag_CorrectlyMaintained {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 发起请求并归还
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"InUseTest"
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timeout:15.0
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error:nil];
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[NSThread sleepForTimeInterval:1.0]; // 等待归还
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// 获取池中连接
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NSArray<HttpdnsNWReusableConnection *> *connections = [self.client connectionsInPoolForKey:poolKey];
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XCTAssertEqual(connections.count, 1, @"Should have 1 connection in pool");
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// 验证：池中连接的 inUse 应为 NO
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for (HttpdnsNWReusableConnection *conn in connections) {
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XCTAssertFalse(conn.inUse, @"Connection in pool should not be marked as inUse");
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}
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}
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// Q2.3 Nil lastUsedDate 处理验证
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- (void)testAbnormal_NilLastUsedDate_HandledGracefully {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 发起请求创建连接
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"NilDateTest"
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timeout:15.0
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error:nil];
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[NSThread sleepForTimeInterval:1.0];
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// 获取连接并设置 lastUsedDate 为 nil
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NSArray<HttpdnsNWReusableConnection *> *connections = [self.client connectionsInPoolForKey:poolKey];
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XCTAssertEqual(connections.count, 1, @"Should have connection");
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HttpdnsNWReusableConnection *conn = connections.firstObject;
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[conn debugSetLastUsedDate:nil];
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// 发起新请求触发 prune（内部应使用 distantPast 处理 nil）
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HttpdnsNWHTTPClientResponse *response = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"NilDateTest"
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timeout:15.0
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error:nil];
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// 验证：不崩溃，正常工作
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XCTAssertNotNil(response, @"Should handle nil lastUsedDate gracefully");
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}
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// Q3.2 池中无失效连接不变式
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- (void)testInvariant_NoInvalidatedInPool {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 发起多个请求（包括成功和超时）
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for (NSInteger i = 0; i < 3; i++) {
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"InvariantTest"
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timeout:15.0
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error:nil];
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}
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// 发起1个超时请求
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/delay/10"
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userAgent:@"TimeoutTest"
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timeout:0.5
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error:nil];
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[NSThread sleepForTimeInterval:2.0];
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// 获取池中所有连接
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NSArray<HttpdnsNWReusableConnection *> *connections = [self.client connectionsInPoolForKey:poolKey];
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// 验证：池中无失效连接
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for (HttpdnsNWReusableConnection *conn in connections) {
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XCTAssertFalse(conn.isInvalidated, @"Pool should not contain invalidated connections");
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}
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}
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// Q3.4 lastUsedDate 单调性验证
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- (void)testInvariant_LastUsedDate_Monotonic {
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[self.client resetPoolStatistics];
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NSString *poolKey = @"127.0.0.1:11080:tcp";
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// 第1次使用
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[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
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userAgent:@"MonotonicTest"
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timeout:15.0
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error:nil];
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[NSThread sleepForTimeInterval:1.0];
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NSArray<HttpdnsNWReusableConnection *> *connections1 = [self.client connectionsInPoolForKey:poolKey];
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XCTAssertEqual(connections1.count, 1, @"Should have connection");
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NSDate *date1 = connections1.firstObject.lastUsedDate;
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XCTAssertNotNil(date1, @"lastUsedDate should be set");
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// 等待1秒确保时间推进
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[NSThread sleepForTimeInterval:1.0];
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// 第2次使用同一连接
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
|
||
userAgent:@"MonotonicTest"
|
||
timeout:15.0
|
||
error:nil];
|
||
|
||
[NSThread sleepForTimeInterval:1.0];
|
||
|
||
NSArray<HttpdnsNWReusableConnection *> *connections2 = [self.client connectionsInPoolForKey:poolKey];
|
||
XCTAssertEqual(connections2.count, 1, @"Should still have 1 connection");
|
||
NSDate *date2 = connections2.firstObject.lastUsedDate;
|
||
|
||
// 验证：lastUsedDate 递增
|
||
XCTAssertTrue([date2 timeIntervalSinceDate:date1] > 0,
|
||
@"lastUsedDate should increase after reuse");
|
||
}
|
||
|
||
// Q5.1 超时+池溢出复合场景
|
||
- (void)testCompound_TimeoutDuringPoolOverflow_Handled {
|
||
[self.client resetPoolStatistics];
|
||
NSString *poolKey = @"127.0.0.1:11080:tcp";
|
||
|
||
// 先填满池（4个成功连接）
|
||
NSMutableArray<XCTestExpectation *> *expectations = [NSMutableArray array];
|
||
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
|
||
|
||
for (NSInteger i = 0; i < 4; i++) {
|
||
XCTestExpectation *expectation = [self expectationWithDescription:
|
||
[NSString stringWithFormat:@"Fill pool %ld", (long)i]];
|
||
[expectations addObject:expectation];
|
||
|
||
dispatch_async(queue, ^{
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11080/delay/2"
|
||
userAgent:@"CompoundTest"
|
||
timeout:15.0
|
||
error:nil];
|
||
[expectation fulfill];
|
||
});
|
||
[NSThread sleepForTimeInterval:0.05];
|
||
}
|
||
|
||
[self waitForExpectations:expectations timeout:20.0];
|
||
[NSThread sleepForTimeInterval:1.0];
|
||
|
||
NSUInteger poolCountBefore = [self.client connectionPoolCountForKey:poolKey];
|
||
XCTAssertLessThanOrEqual(poolCountBefore, 4, @"Pool should have ≤4 connections");
|
||
|
||
// 第5个请求超时
|
||
NSError *error = nil;
|
||
HttpdnsNWHTTPClientResponse *response = [self.client performRequestWithURLString:@"http://127.0.0.1:11080/delay/10"
|
||
userAgent:@"TimeoutRequest"
|
||
timeout:0.5
|
||
error:&error];
|
||
|
||
XCTAssertNil(response, @"Timeout request should return nil");
|
||
XCTAssertNotNil(error, @"Should have error");
|
||
|
||
[NSThread sleepForTimeInterval:1.0];
|
||
|
||
// 验证：超时连接未加入池
|
||
NSUInteger poolCountAfter = [self.client connectionPoolCountForKey:poolKey];
|
||
XCTAssertLessThanOrEqual(poolCountAfter, 4, @"Timed-out connection should not be added to pool");
|
||
}
|
||
|
||
// Q2.4 打开失败不加入池
|
||
- (void)testAbnormal_OpenFailure_NotAddedToPool {
|
||
[self.client resetPoolStatistics];
|
||
|
||
// 尝试连接无效端口（连接拒绝）
|
||
NSError *error = nil;
|
||
HttpdnsNWHTTPClientResponse *response = [self.client performRequestWithURLString:@"http://127.0.0.1:99999/get"
|
||
userAgent:@"FailureTest"
|
||
timeout:2.0
|
||
error:&error];
|
||
|
||
// 验证：请求失败
|
||
XCTAssertNil(response, @"Should fail to connect to invalid port");
|
||
|
||
// 验证：无连接加入池
|
||
XCTAssertEqual([self.client totalConnectionCount], 0,
|
||
@"Failed connection should not be added to pool");
|
||
}
|
||
|
||
// Q2.5 多次 invalidate 幂等性
|
||
- (void)testAbnormal_MultipleInvalidate_Idempotent {
|
||
[self.client resetPoolStatistics];
|
||
NSString *poolKey = @"127.0.0.1:11080:tcp";
|
||
|
||
// 创建连接
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
|
||
userAgent:@"InvalidateTest"
|
||
timeout:15.0
|
||
error:nil];
|
||
|
||
[NSThread sleepForTimeInterval:1.0];
|
||
|
||
NSArray<HttpdnsNWReusableConnection *> *connections = [self.client connectionsInPoolForKey:poolKey];
|
||
XCTAssertEqual(connections.count, 1, @"Should have connection");
|
||
|
||
HttpdnsNWReusableConnection *conn = connections.firstObject;
|
||
|
||
// 多次 invalidate
|
||
[conn debugInvalidate];
|
||
[conn debugInvalidate];
|
||
[conn debugInvalidate];
|
||
|
||
// 验证：不崩溃
|
||
XCTAssertTrue(conn.isInvalidated, @"Connection should be invalidated");
|
||
}
|
||
|
||
// Q5.2 并发 dequeue 竞态测试
|
||
- (void)testCompound_ConcurrentDequeueDuringPrune_Safe {
|
||
[self.client resetPoolStatistics];
|
||
|
||
// 在两个端口创建连接
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
|
||
userAgent:@"RaceTest"
|
||
timeout:15.0
|
||
error:nil];
|
||
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11443/get"
|
||
userAgent:@"RaceTest"
|
||
timeout:15.0
|
||
error:nil];
|
||
|
||
[NSThread sleepForTimeInterval:1.0];
|
||
|
||
// 等待30秒让连接过期
|
||
[NSThread sleepForTimeInterval:30.5];
|
||
|
||
// 并发触发两个端口的 dequeue（会触发 prune）
|
||
dispatch_group_t group = dispatch_group_create();
|
||
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
|
||
|
||
dispatch_group_async(group, queue, ^{
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11080/get"
|
||
userAgent:@"Race1"
|
||
timeout:15.0
|
||
error:nil];
|
||
});
|
||
|
||
dispatch_group_async(group, queue, ^{
|
||
[self.client performRequestWithURLString:@"http://127.0.0.1:11443/get"
|
||
userAgent:@"Race2"
|
||
timeout:15.0
|
||
error:nil];
|
||
});
|
||
|
||
// 等待完成
|
||
dispatch_group_wait(group, dispatch_time(DISPATCH_TIME_NOW, 20 * NSEC_PER_SEC));
|
||
|
||
// 验证：无崩溃，连接池正常工作
|
||
NSUInteger totalCount = [self.client totalConnectionCount];
|
||
XCTAssertLessThanOrEqual(totalCount, 4, @"Pool should remain stable after concurrent prune");
|
||
}
|
||
|
||
@end
|