| // Copyright (c) 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef QUICHE_QUIC_CORE_QUIC_VERSION_MANAGER_H_ |
| #define QUICHE_QUIC_CORE_QUIC_VERSION_MANAGER_H_ |
| |
| #include "quiche/quic/core/quic_versions.h" |
| #include "quiche/quic/platform/api/quic_export.h" |
| |
| namespace quic { |
| |
| // Used to generate filtered supported versions based on flags. |
| class QUIC_EXPORT_PRIVATE QuicVersionManager { |
| public: |
| // |supported_versions| should be sorted in the order of preference (typically |
| // highest supported version to the lowest supported version). |
| explicit QuicVersionManager(ParsedQuicVersionVector supported_versions); |
| virtual ~QuicVersionManager(); |
| |
| // Returns currently supported QUIC versions. This vector has the same order |
| // as the versions passed to the constructor. |
| const ParsedQuicVersionVector& GetSupportedVersions(); |
| |
| // Returns currently supported versions using HTTP/3. |
| const ParsedQuicVersionVector& GetSupportedVersionsWithOnlyHttp3(); |
| |
| // Returns the list of supported ALPNs, based on the current supported |
| // versions and any custom additions by subclasses. |
| const std::vector<std::string>& GetSupportedAlpns(); |
| |
| protected: |
| // If the value of any reloadable flag is different from the cached value, |
| // re-filter |filtered_supported_versions_| and update the cached flag values. |
| // Otherwise, does nothing. |
| // TODO(dschinazi): Make private when deprecating |
| // FLAGS_gfe2_restart_flag_quic_disable_old_alt_svc_format. |
| void MaybeRefilterSupportedVersions(); |
| |
| // Refilters filtered_supported_versions_. |
| virtual void RefilterSupportedVersions(); |
| |
| // RefilterSupportedVersions() must be called before calling this method. |
| // TODO(dschinazi): Remove when deprecating |
| // FLAGS_gfe2_restart_flag_quic_disable_old_alt_svc_format. |
| const QuicTransportVersionVector& filtered_transport_versions() const { |
| return filtered_transport_versions_; |
| } |
| |
| // Subclasses may add custom ALPNs to the supported list by overriding |
| // RefilterSupportedVersions() to first call |
| // QuicVersionManager::RefilterSupportedVersions() then AddCustomAlpn(). |
| // Must not be called elsewhere. |
| void AddCustomAlpn(const std::string& alpn); |
| |
| private: |
| // Cached value of reloadable flags. |
| // quic_enable_version_2_draft_01 flag |
| bool enable_version_2_draft_01_ = false; |
| // quic_disable_version_rfcv1 flag |
| bool disable_version_rfcv1_ = true; |
| // quic_disable_version_draft_29 flag |
| bool disable_version_draft_29_ = true; |
| // quic_disable_version_q050 flag |
| bool disable_version_q050_ = true; |
| // quic_disable_version_q046 flag |
| bool disable_version_q046_ = true; |
| // quic_disable_version_q043 flag |
| bool disable_version_q043_ = true; |
| |
| // The list of versions that may be supported. |
| const ParsedQuicVersionVector allowed_supported_versions_; |
| |
| // The following vectors are calculated from reloadable flags by |
| // RefilterSupportedVersions(). It is performed lazily when first needed, and |
| // after that, since the calculation is relatively expensive, only if the flag |
| // values change. |
| |
| // This vector contains QUIC versions which are currently supported based on |
| // flags. |
| ParsedQuicVersionVector filtered_supported_versions_; |
| // Currently supported versions using HTTP/3. |
| ParsedQuicVersionVector filtered_supported_versions_with_http3_; |
| // This vector contains the transport versions from |
| // |filtered_supported_versions_|. No guarantees are made that the same |
| // transport version isn't repeated. |
| QuicTransportVersionVector filtered_transport_versions_; |
| // Contains the list of ALPNs corresponding to filtered_supported_versions_ |
| // with custom ALPNs added. |
| std::vector<std::string> filtered_supported_alpns_; |
| }; |
| |
| } // namespace quic |
| |
| #endif // QUICHE_QUIC_CORE_QUIC_VERSION_MANAGER_H_ |