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https://github.com/facebookincubator/mvfst.git
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00e67c1bf9
Reviewed By: lnicco Differential Revision: D33587012 fbshipit-source-id: 972eb440f0156c9c04aa6e8787561b18295c1a97
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <folly/Expected.h>
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#include <quic/QuicException.h>
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#include <quic/codec/ConnectionIdAlgo.h>
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#include <quic/codec/QuicConnectionId.h>
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namespace quic {
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/**
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* Default implementation with algorithms to encode and decode for
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* ConnectionId given routing info (embedded in ServerConnectionIdParams)
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*
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* The schema for connection id is defined as follows:
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*
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* First 2 (0 - 1) bits are reserved for short version id of the connection id
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* If the load balancer (e.g. L4 lb) doesn't understand this version,
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* it can fallback to default routing
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* Depending on version following mappings:
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* Version 1:
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* Next 16 bits (2 - 17) are reserved for host id (L4 LB use)
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* Next 8 bits (18 - 25) are reserved for worker id
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* Next bit 26 is reserved for the Quic server id: server id is used to
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* distinguish between the takeover instance and the taken over one
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0 1 2 3 4 .. 17 18 .. 25 26 27 28 .. 63
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|VERSION| For L4 LB | WORKER_ID | SERVER_ID | ..
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*
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* Version 2:
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* Next 6 bits (2 - 7) are not used (random)
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* Next 24 bits (8 - 31) are reserved for host id
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* Next 8 bits (32 - 39) are reserved for worker id
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* Next bit 40 is reserved for the Quic server id
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0 1 2 .. 7 8 .. 31 32 .. 39 40 41 ... 63
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|VERSION| UNUSED | For L4 LB | WORKER_ID | SERVER_ID | ..
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*/
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class DefaultConnectionIdAlgo : public ConnectionIdAlgo {
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public:
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~DefaultConnectionIdAlgo() override = default;
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/**
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* Check if this implementation of algorithm can parse the given ConnectionId
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*/
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bool canParse(const ConnectionId& id) const noexcept override;
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/**
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* Parses ServerConnectionIdParams from the given connection id.
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*/
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folly::Expected<ServerConnectionIdParams, QuicInternalException>
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parseConnectionId(const ConnectionId& id) noexcept override;
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/**
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* Encodes the given ServerConnectionIdParams into connection id
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*/
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folly::Expected<ConnectionId, QuicInternalException> encodeConnectionId(
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const ServerConnectionIdParams& params) noexcept override;
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};
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/**
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* Factory Interface to create ConnectionIdAlgo instance.
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*/
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class DefaultConnectionIdAlgoFactory : public ConnectionIdAlgoFactory {
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public:
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~DefaultConnectionIdAlgoFactory() override = default;
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std::unique_ptr<ConnectionIdAlgo> make() override {
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return std::make_unique<DefaultConnectionIdAlgo>();
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}
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};
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} // namespace quic
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