apacheGH-34865: [C++][Java][Flight RPC] Add Session management messag…

…es (apache#34817)

### Rationale for this change

Flight presently contains no formal mechanism for managing connection/query configuration options; instead, request headers and/or non-query SQL statements are often used in lieu, with unnecessary overhead and poor failure handling.  A stateless (from Flight's perspective) Flight format extension is desirable to close this gap for server implementations that use/want connection state/context.

### What changes are included in this PR?

"Session" set/get/close Actions and server-side helper middleware.

### Are these changes tested?

Integration tests (C++ currently broken due to middleware-related framework issue) and some complex-case unit testing are included.

### Are there any user-facing changes?

Non-breaking extensions to wire format and corresponding client/server Flight RPC API extensions.

* Closes: apache#34865

Lead-authored-by: Paul Nienaber <paul.nienaber@dremio.com>
Co-authored-by: Paul Nienaber <github@phox.ca>
Co-authored-by: James Duong <jduong@dremio.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: David Li <li.davidm96@gmail.com>
# Conflicts:
#	java/flight/flight-integration-tests/src/main/java/org/apache/arrow/flight/integration/tests/Scenarios.java
#	java/flight/flight-integration-tests/src/test/java/org/apache/arrow/flight/integration/tests/IntegrationTest.java
#	testing

cpp/src/arrow/flight/client.cc

@@ -713,6 +713,47 @@ arrow::Result<FlightClient::DoExchangeResult> FlightClient::DoExchange(
   return result;
 }
 
+::arrow::Result<SetSessionOptionsResult> FlightClient::SetSessionOptions(
+    const FlightCallOptions& options, const SetSessionOptionsRequest& request) {
+  RETURN_NOT_OK(CheckOpen());
+  ARROW_ASSIGN_OR_RAISE(auto body, request.SerializeToString());
+  Action action{ActionType::kSetSessionOptions.type, Buffer::FromString(body)};
+  ARROW_ASSIGN_OR_RAISE(auto stream, DoAction(options, action));
+  ARROW_ASSIGN_OR_RAISE(auto result, stream->Next());
+  ARROW_ASSIGN_OR_RAISE(
+      auto set_session_options_result,
+      SetSessionOptionsResult::Deserialize(std::string_view(*result->body)));
+  ARROW_RETURN_NOT_OK(stream->Drain());
+  return set_session_options_result;
+}
+
+::arrow::Result<GetSessionOptionsResult> FlightClient::GetSessionOptions(
+    const FlightCallOptions& options, const GetSessionOptionsRequest& request) {
+  RETURN_NOT_OK(CheckOpen());
+  ARROW_ASSIGN_OR_RAISE(auto body, request.SerializeToString());
+  Action action{ActionType::kGetSessionOptions.type, Buffer::FromString(body)};
+  ARROW_ASSIGN_OR_RAISE(auto stream, DoAction(options, action));
+  ARROW_ASSIGN_OR_RAISE(auto result, stream->Next());
+  ARROW_ASSIGN_OR_RAISE(
+      auto get_session_options_result,
+      GetSessionOptionsResult::Deserialize(std::string_view(*result->body)));
+  ARROW_RETURN_NOT_OK(stream->Drain());
+  return get_session_options_result;
+}
+
+::arrow::Result<CloseSessionResult> FlightClient::CloseSession(
+    const FlightCallOptions& options, const CloseSessionRequest& request) {
+  RETURN_NOT_OK(CheckOpen());
+  ARROW_ASSIGN_OR_RAISE(auto body, request.SerializeToString());
+  Action action{ActionType::kCloseSession.type, Buffer::FromString(body)};
+  ARROW_ASSIGN_OR_RAISE(auto stream, DoAction(options, action));
+  ARROW_ASSIGN_OR_RAISE(auto result, stream->Next());
+  ARROW_ASSIGN_OR_RAISE(auto close_session_result,
+                        CloseSessionResult::Deserialize(std::string_view(*result->body)));
+  ARROW_RETURN_NOT_OK(stream->Drain());
+  return close_session_result;
+}
+
 Status FlightClient::Close() {
   if (!closed_) {
     closed_ = true;

cpp/src/arrow/flight/client.h

@@ -383,6 +383,27 @@ class ARROW_FLIGHT_EXPORT FlightClient {
     return DoExchange({}, descriptor);
   }
 
+  /// \brief Set server session option(s) by name/value. Sessions are generally
+  /// persisted via HTTP cookies.
+  /// \param[in] options Per-RPC options
+  /// \param[in] request The server session options to set
+  ::arrow::Result<SetSessionOptionsResult> SetSessionOptions(
+      const FlightCallOptions& options, const SetSessionOptionsRequest& request);
+
+  /// \brief Get the current server session options. The session is generally
+  /// accessed via an HTTP cookie.
+  /// \param[in] options Per-RPC options
+  /// \param[in] request The (empty) GetSessionOptions request object.
+  ::arrow::Result<GetSessionOptionsResult> GetSessionOptions(
+      const FlightCallOptions& options, const GetSessionOptionsRequest& request);
+
+  /// \brief Close/invalidate the current server session. The session is generally
+  /// accessed via an HTTP cookie.
+  /// \param[in] options Per-RPC options
+  /// \param[in] request The (empty) CloseSession request object.
+  ::arrow::Result<CloseSessionResult> CloseSession(const FlightCallOptions& options,
+                                                   const CloseSessionRequest& request);
+
   /// \brief Explicitly shut down and clean up the client.
   ///
   /// For backwards compatibility, this will be implicitly called by

cpp/src/arrow/flight/integration_tests/flight_integration_test.cc

@@ -71,6 +71,8 @@ TEST(FlightIntegration, ExpirationTimeRenewFlightEndpoint) {
   ASSERT_OK(RunScenario("expiration_time:renew_flight_endpoint"));
 }
 
+TEST(FlightIntegration, SessionOptions) { ASSERT_OK(RunScenario("session_options")); }
+
 TEST(FlightIntegration, PollFlightInfo) { ASSERT_OK(RunScenario("poll_flight_info")); }
 
 TEST(FlightIntegration, AppMetadataFlightInfoEndpoint) {

cpp/src/arrow/flight/integration_tests/test_integration.cc

@@ -28,11 +28,13 @@
 #include "arrow/array/array_nested.h"
 #include "arrow/array/array_primitive.h"
 #include "arrow/array/builder_primitive.h"
+#include "arrow/flight/client_cookie_middleware.h"
 #include "arrow/flight/client_middleware.h"
 #include "arrow/flight/server_middleware.h"
 #include "arrow/flight/sql/client.h"
 #include "arrow/flight/sql/column_metadata.h"
 #include "arrow/flight/sql/server.h"
+#include "arrow/flight/sql/server_session_middleware.h"
 #include "arrow/flight/sql/types.h"
 #include "arrow/flight/test_util.h"
 #include "arrow/flight/types.h"
@@ -744,6 +746,155 @@ class ExpirationTimeRenewFlightEndpointScenario : public Scenario {
   }
 };
 
+/// \brief The server used for testing Session Options.
+///
+/// SetSessionOptions has a blacklisted option name and string option value,
+/// both "lol_invalid", which will result in errors attempting to set either.
+class SessionOptionsServer : public sql::FlightSqlServerBase {
+  static inline const std::string invalid_option_name = "lol_invalid";
+  static inline const SessionOptionValue invalid_option_value = "lol_invalid";
+
+  const std::string session_middleware_key;
+  // These will never be threaded so using a plain map and no lock
+  std::map<std::string, SessionOptionValue> session_store_;
+
+ public:
+  explicit SessionOptionsServer(std::string session_middleware_key)
+      : FlightSqlServerBase(),
+        session_middleware_key(std::move(session_middleware_key)) {}
+
+  arrow::Result<SetSessionOptionsResult> SetSessionOptions(
+      const ServerCallContext& context,
+      const SetSessionOptionsRequest& request) override {
+    SetSessionOptionsResult res;
+
+    auto* middleware = static_cast<sql::ServerSessionMiddleware*>(
+        context.GetMiddleware(session_middleware_key));
+    ARROW_ASSIGN_OR_RAISE(std::shared_ptr<sql::FlightSession> session,
+                          middleware->GetSession());
+
+    for (const auto& [name, value] : request.session_options) {
+      // Blacklisted value name
+      if (name == invalid_option_name) {
+        res.errors.emplace(name, SetSessionOptionsResult::Error{
+                                     SetSessionOptionErrorValue::kInvalidName});
+        continue;
+      }
+      // Blacklisted option value
+      if (value == invalid_option_value) {
+        res.errors.emplace(name, SetSessionOptionsResult::Error{
+                                     SetSessionOptionErrorValue::kInvalidValue});
+        continue;
+      }
+      if (std::holds_alternative<std::monostate>(value)) {
+        session->EraseSessionOption(name);
+        continue;
+      }
+      session->SetSessionOption(name, value);
+    }
+
+    return res;
+  }
+
+  arrow::Result<GetSessionOptionsResult> GetSessionOptions(
+      const ServerCallContext& context,
+      const GetSessionOptionsRequest& request) override {
+    auto* middleware = static_cast<sql::ServerSessionMiddleware*>(
+        context.GetMiddleware(session_middleware_key));
+    if (!middleware->HasSession()) {
+      return Status::Invalid("No existing session to get options from.");
+    }
+    ARROW_ASSIGN_OR_RAISE(std::shared_ptr<sql::FlightSession> session,
+                          middleware->GetSession());
+
+    return GetSessionOptionsResult{session->GetSessionOptions()};
+  }
+
+  arrow::Result<CloseSessionResult> CloseSession(
+      const ServerCallContext& context, const CloseSessionRequest& request) override {
+    // Broken (does not expire cookie) until C++ middleware handling (GH-39791) fixed:
+    auto* middleware = static_cast<sql::ServerSessionMiddleware*>(
+        context.GetMiddleware(session_middleware_key));
+    ARROW_RETURN_NOT_OK(middleware->CloseSession());
+    return CloseSessionResult{CloseSessionStatus::kClosed};
+  }
+};
+
+/// \brief The Session Options scenario.
+///
+/// This tests Session Options functionality as well as ServerSessionMiddleware.
+class SessionOptionsScenario : public Scenario {
+  static inline const std::string server_middleware_key = "sessionmiddleware";
+
+  Status MakeServer(std::unique_ptr<FlightServerBase>* server,
+                    FlightServerOptions* options) override {
+    *server = std::make_unique<SessionOptionsServer>(server_middleware_key);
+
+    auto id_gen_int = std::make_shared<std::atomic_int>(1000);
+    options->middleware.emplace_back(
+        server_middleware_key,
+        sql::MakeServerSessionMiddlewareFactory(
+            [=]() -> std::string { return std::to_string((*id_gen_int)++); }));
+
+    return Status::OK();
+  }
+
+  Status MakeClient(FlightClientOptions* options) override {
+    options->middleware.emplace_back(GetCookieFactory());
+    return Status::OK();
+  }
+
+  Status RunClient(std::unique_ptr<FlightClient> flight_client) override {
+    sql::FlightSqlClient client{std::move(flight_client)};
+
+    // Set
+    auto req1 = SetSessionOptionsRequest{
+        {{"foolong", 123L},
+         {"bardouble", 456.0},
+         {"lol_invalid", "this won't get set"},
+         {"key_with_invalid_value", "lol_invalid"},
+         {"big_ol_string_list", std::vector<std::string>{"a", "b", "sea", "dee", " ",
+                                                         "  ", "geee", "(づ｡◕‿‿◕｡)づ"}}}};
+    ARROW_ASSIGN_OR_RAISE(auto res1, client.SetSessionOptions({}, req1));
+    // Some errors
+    if (res1.errors !=
+        std::map<std::string, SetSessionOptionsResult::Error>{
+            {"lol_invalid",
+             SetSessionOptionsResult::Error{SetSessionOptionErrorValue::kInvalidName}},
+            {"key_with_invalid_value", SetSessionOptionsResult::Error{
+                                           SetSessionOptionErrorValue::kInvalidValue}}}) {
+      return Status::Invalid("res1 incorrect: " + res1.ToString());
+    }
+    // Some set, some omitted due to above errors
+    ARROW_ASSIGN_OR_RAISE(auto res2, client.GetSessionOptions({}, {}));
+    if (res2.session_options !=
+        std::map<std::string, SessionOptionValue>{
+            {"foolong", 123L},
+            {"bardouble", 456.0},
+            {"big_ol_string_list",
+             std::vector<std::string>{"a", "b", "sea", "dee", " ", "  ", "geee",
+                                      "(づ｡◕‿‿◕｡)づ"}}}) {
+      return Status::Invalid("res2 incorrect: " + res2.ToString());
+    }
+    // Update
+    ARROW_ASSIGN_OR_RAISE(
+        auto res3,
+        client.SetSessionOptions(
+            {}, SetSessionOptionsRequest{
+                    {{"foolong", std::monostate{}},
+                     {"big_ol_string_list", "a,b,sea,dee, ,  ,geee,(づ｡◕‿‿◕｡)づ"}}}));
+    ARROW_ASSIGN_OR_RAISE(auto res4, client.GetSessionOptions({}, {}));
+    if (res4.session_options !=
+        std::map<std::string, SessionOptionValue>{
+            {"bardouble", 456.0},
+            {"big_ol_string_list", "a,b,sea,dee, ,  ,geee,(づ｡◕‿‿◕｡)づ"}}) {
+      return Status::Invalid("res4 incorrect: " + res4.ToString());
+    }
+
+    return Status::OK();
+  }
+};
+
 /// \brief The server used for testing PollFlightInfo().
 class PollFlightInfoServer : public FlightServerBase {
  public:
@@ -1952,6 +2103,9 @@ Status GetScenario(const std::string& scenario_name, std::shared_ptr<Scenario>*
   } else if (scenario_name == "expiration_time:renew_flight_endpoint") {
     *out = std::make_shared<ExpirationTimeRenewFlightEndpointScenario>();
     return Status::OK();
+  } else if (scenario_name == "session_options") {
+    *out = std::make_shared<SessionOptionsScenario>();
+    return Status::OK();
   } else if (scenario_name == "poll_flight_info") {
     *out = std::make_shared<PollFlightInfoScenario>();
     return Status::OK();