src/net/ApiChain.cpp

@@ -0,0 +1,53 @@
+#include "ApiChain.hpp"
+#include <stdexcept>
+
+namespace geopro::net {
+
+ApiChain::ApiChain(QList<StepFactory> steps, Predicate isFailure, QObject* parent)
+    : QObject(parent), steps_(std::move(steps)), isFailure_(std::move(isFailure)) {
+    Q_ASSERT(!steps_.isEmpty());                 // 契约：至少一步（空链永不发 succeeded）
+    Q_ASSERT(isFailure_);
+    runNext();
+}
+
+void ApiChain::runNext() {
+    if (aborted_) return;
+    if (index_ >= steps_.size()) {               // 全部完成
+        emit succeeded(responses_);
+        deleteLater();
+        return;
+    }
+    IApiCall* call = nullptr;
+    try {
+        call = steps_[index_](responses_);       // 工厂可抛（如 RSA 失败）：转 failed
+    } catch (const std::exception& e) {
+        ApiResponse r;
+        r.rawError = QString::fromUtf8(e.what());  // 保留原因；登录 RSA 文案在 AuthService 层包装
+        aborted_ = true;
+        emit failed(index_, r);
+        deleteLater();
+        return;
+    }
+    current_ = call;
+    QObject::connect(call, &IApiCall::finished, this, [this](const ApiResponse& resp) {
+        if (aborted_) return;                    // §5.0 入口守卫
+        if (isFailure_(resp)) {
+            aborted_ = true;
+            emit failed(index_, resp);
+            deleteLater();
+            return;
+        }
+        responses_.append(resp);
+        ++index_;
+        runNext();                               // 链式推进
+    });
+}
+
+void ApiChain::abort() {
+    if (aborted_) return;
+    aborted_ = true;
+    if (current_) current_->abort();             // abort 当前在飞步骤
+    deleteLater();
+}
+
+}  // namespace geopro::net

src/net/ApiChain.hpp

@@ -0,0 +1,35 @@
+#pragma once
+#include <functional>
+#include <QList>
+#include <QPointer>
+#include <QObject>
+#include "IApiCall.hpp"
+
+namespace geopro::net {
+
+// 顺序执行 N 个步骤（依赖链）：每步工厂用既往响应构造下一 IApiCall（工厂可抛 std::exception）。
+// 任一步失败 → fail-fast：failed(index,resp) + abort 当前在飞 + deleteLater。
+// 全部成功 → succeeded(按序响应)。安全不变量见 spec §5.0（aborted_ 闸门 + 一律 deleteLater）。
+// 与 ApiBatch 对称：同 Predicate、同信号面、同安全约束。
+class ApiChain : public QObject {
+    Q_OBJECT
+public:
+    // 工厂：入参为已完成步骤的响应（按序），返回本步 IApiCall（接管所有权）。可抛 std::exception。
+    using StepFactory = std::function<IApiCall*(const QList<ApiResponse>& prior)>;
+    using Predicate = std::function<bool(const ApiResponse&)>;
+    ApiChain(QList<StepFactory> steps, Predicate isFailure, QObject* parent = nullptr);
+    void abort();
+signals:
+    void succeeded(const QList<geopro::net::ApiResponse>& responses);
+    void failed(int index, const geopro::net::ApiResponse& resp);
+private:
+    void runNext();                              // 构造并连接下一步（工厂抛出 → emit failed）
+    QList<StepFactory> steps_;
+    Predicate isFailure_;
+    QList<ApiResponse> responses_;
+    QPointer<IApiCall> current_;
+    int index_ = 0;
+    bool aborted_ = false;
+};
+
+}  // namespace geopro::net

src/net/CMakeLists.txt

@@ -7,6 +7,7 @@ add_library(geopro_net STATIC
   IApiCall.cpp
   ApiCall.cpp
   ApiBatch.cpp
+  ApiChain.cpp
   AuthService.cpp)
 target_include_directories(geopro_net PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(geopro_net PUBLIC OpenSSL::SSL OpenSSL::Crypto Qt6::Core Qt6::Network)

tests/CMakeLists.txt

@@ -50,6 +50,8 @@ target_sources(geopro_tests PRIVATE net/test_rsa.cpp)
 target_sources(geopro_tests PRIVATE net/test_auth.cpp)
 # ApiBatch 离线单测（QSignalSpy 需 Qt6::Test）。
 target_sources(geopro_tests PRIVATE net/test_api_batch.cpp)
+# ApiChain 离线单测（顺序依赖链：顺序/失败短路/abort闸门/工厂抛异常）。
+target_sources(geopro_tests PRIVATE net/test_api_chain.cpp)
 target_link_libraries(geopro_tests PRIVATE geopro_net OpenSSL::SSL OpenSSL::Crypto Qt6::Core Qt6::Network Qt6::Test)
 
 # geopro_data 链 Qt6::Core，测试 exe 运行（含 gtest 发现）需要 Qt6Core.dll 等运行时

tests/net/test_api_chain.cpp

@@ -0,0 +1,70 @@
+#include <gtest/gtest.h>
+#include <stdexcept>
+#include <QSignalSpy>
+#include "ApiChain.hpp"
+#include "net/FakeApiCall.hpp"
+
+using namespace geopro::net;
+using geopro::net::test::FakeApiCall;
+
+namespace {
+ApiResponse ok(int v = 0) { ApiResponse r; r.code = 200; r.httpStatus = 200; r.data = QJsonObject{{"v", v}}; return r; }
+ApiResponse bad() { ApiResponse r; r.code = 500; r.httpStatus = 200; r.msg = QStringLiteral("boom"); return r; }
+auto isFailure = [](const ApiResponse& r) { return r.code != 200 || !r.rawError.isEmpty(); };
+}  // namespace
+
+TEST(ApiChain, RunsStepsInOrderAndPassesPriorResponses) {
+    auto* s1 = new FakeApiCall;
+    auto* s2 = new FakeApiCall;
+    int seenPrior = -1;
+    QList<ApiChain::StepFactory> steps{
+        [&](const QList<ApiResponse>&) -> IApiCall* { return s1; },
+        [&](const QList<ApiResponse>& prior) -> IApiCall* {
+            seenPrior = prior.size();              // 第二步能看到第一步响应
+            return s2;
+        }};
+    auto* chain = new ApiChain(steps, isFailure);
+    QSignalSpy okSpy(chain, &ApiChain::succeeded);
+    s1->fire(ok(11));                              // 第一步完成 → 触发第二步工厂
+    EXPECT_EQ(seenPrior, 1);
+    EXPECT_EQ(okSpy.count(), 0);                   // 还差第二步
+    s2->fire(ok(22));
+    EXPECT_EQ(okSpy.count(), 1);
+    const auto resps = okSpy.takeFirst().at(0).value<QList<ApiResponse>>();
+    EXPECT_EQ(resps.size(), 2);
+}
+
+TEST(ApiChain, FailFastShortCircuitsRemainingSteps) {
+    auto* s1 = new FakeApiCall;
+    bool secondBuilt = false;
+    QList<ApiChain::StepFactory> steps{
+        [&](const QList<ApiResponse>&) -> IApiCall* { return s1; },
+        [&](const QList<ApiResponse>&) -> IApiCall* { secondBuilt = true; return new FakeApiCall; }};
+    auto* chain = new ApiChain(steps, isFailure);
+    QSignalSpy failSpy(chain, &ApiChain::failed);
+    s1->fire(bad());                               // 第一步失败
+    EXPECT_EQ(failSpy.count(), 1);
+    EXPECT_FALSE(secondBuilt);                     // 后续步骤不再构造
+}
+
+TEST(ApiChain, AbortGateSuppressesLateSignals) {
+    auto* s1 = new FakeApiCall;
+    QList<ApiChain::StepFactory> steps{[&](const QList<ApiResponse>&) -> IApiCall* { return s1; }};
+    auto* chain = new ApiChain(steps, isFailure);
+    QSignalSpy okSpy(chain, &ApiChain::succeeded);
+    chain->abort();
+    EXPECT_TRUE(s1->aborted);                      // 在飞步骤被 abort
+    s1->fire(ok());                                // 迟到
+    EXPECT_EQ(okSpy.count(), 0);                   // aborted_ 闸门
+}
+
+TEST(ApiChain, StepFactoryThrowBecomesFailed) {
+    auto* s1 = new FakeApiCall;
+    QList<ApiChain::StepFactory> steps{
+        [&](const QList<ApiResponse>&) -> IApiCall* { return s1; },
+        [&](const QList<ApiResponse>&) -> IApiCall* { throw std::runtime_error("rsa fail"); }};
+    auto* chain = new ApiChain(steps, isFailure);
+    QSignalSpy failSpy(chain, &ApiChain::failed);
+    s1->fire(ok());                                // 触发第二步工厂 → 抛 → failed
+    EXPECT_EQ(failSpy.count(), 1);
+}