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Roadmap.md: Discuss the near term future of rust-libp2p (#2997)
The items in this roadmap are ordered by importance where importance is defined as:
- Enable others to build with rust-libp2p before building components ourself.
- e.g.[cross behaviour communication](#cross-behaviour-communication) over[Kademlia client
mode](#kademlia-client-mode) where the former enables the latter
- Invest into tools that enable us to work more efficiently
- e.g.[Testground](#testground-abstraction) and [release process](#release-process)
- Better do one thing well than many things close to right.
- e.g. deprioritize [BitSwap implementation](#bitswap-implementation) and continue on
[QUIC](#quic-support) even once first ieration is merged. That does not imply that we won't
support community members implementing it.
- Improve existing components before introducing new ones.
- e.g.[Kademlia client mode](#kademlia-client-mode) before [WebTransport](#webtransport)- Loading branch information
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| # rust-libp2p Roadmap | ||
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| Below is a high level roadmap for the rust-libp2p project. Items are ordered by priority (high to | ||
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| For a more detailed view see https://github.com/orgs/libp2p/projects/4/views/1. | ||
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| <!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc-refresh-toc --> | ||
| **Table of Contents** | ||
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| - [rust-libp2p Roadmap](#rust-libp2p-roadmap) | ||
| - [TLS support](#tls-support) | ||
| - [Experimental QUIC support](#experimental-quic-support) | ||
| - [WebRTC support (browser-to-server)](#webrtc-support-browser-to-server) | ||
| - [Cross Behaviour communication](#cross-behaviour-communication) | ||
| - [Generic connection management](#generic-connection-management) | ||
| - [Kademlia efficient querying](#kademlia-efficient-querying) | ||
| - [Kademlia client mode](#kademlia-client-mode) | ||
| - [Optimize Hole punching](#optimize-hole-punching) | ||
| - [Streaming response protocol aka. the ultimate escape hatch](#streaming-response-protocol-aka-the-ultimate-escape-hatch) | ||
| - [Improved WASM support](#improved-wasm-support) | ||
| - [Handshake optimizations](#handshake-optimizations) | ||
| - [Bitswap implementation](#bitswap-implementation) | ||
| - [WebTransport](#webtransport) | ||
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| <!-- markdown-toc end --> | ||
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| ## TLS support | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|-------------|-------------------|-------------------------------------------------|------------------------------------|------------| | ||
| | Connectivity | In progress | Q4/2022 | https://github.com/libp2p/rust-libp2p/pull/2945 | [QUIC](#experimental-quic-support) | | | ||
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| This allows us to secure both TCP and QUIC connections using TLS. This is a requirement for QUIC | ||
| support. Running TLS on top of TCP is a nice to have, since we already have noise. | ||
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| ## Experimental QUIC support | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|-------------|-------------------|---------------------------------------------------|---------------------------------------------------------------------|------------| | ||
| | Connectivity | In progress | Q4/2022 | https://github.com/libp2p/rust-libp2p/issues/2883 | [TLS](#tls-support), https://github.com/libp2p/test-plans/issues/53 | | | ||
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| QUIC has been on the roadmap for a long time. It enables various performance improvements as well as | ||
| higher hole punching success rates. We are close to finishing a first version with | ||
| https://github.com/libp2p/rust-libp2p/pull/2289. | ||
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| Long term there is lots more to do, see tracking issue | ||
| https://github.com/libp2p/rust-libp2p/issues/2883. Though this will be tackled as a new roadmap | ||
| item. | ||
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| ## WebRTC support (browser-to-server) | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|-------------|-------------------|------------------------------------------|------------------------------------------------|------------| | ||
| | Connectivity | In progress | Q4/2022 | https://github.com/libp2p/specs/pull/412 | https://github.com/libp2p/test-plans/issues/53 | | | ||
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| We are currently implementing WebRTC for **browser-to-server** connectivity in | ||
| https://github.com/libp2p/rust-libp2p/pull/2622. More specifically the server side. This will enable | ||
| browser nodes to connect to rust-libp2p nodes where the latter only have self-signed TLS | ||
| certificates. See https://github.com/libp2p/specs/pull/412 for in-depth motivation. | ||
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| Long term we should enable rust-libp2p running in the browser via WASM to use the browser's WebRTC | ||
| stack. Though that should only happen after improved WASM support, see below. | ||
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| ## Cross Behaviour communication | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |----------------------|--------|-------------------|---------------------------------------------------|---------------------------------------------------|-----------------------------------------------| | ||
| | Developer ergonomics | todo | Q1/2023 | https://github.com/libp2p/rust-libp2p/issues/2680 | https://github.com/libp2p/rust-libp2p/issues/2832 | [Kademlia client mode](#kademlia-client-mode) | | ||
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| Today `NetworkBehaviour` implementations like Kademlia, GossipSub or Circuit Relay v2 can not | ||
| communicate with each other, i.e. can not make use of information known by another | ||
| `NetworkBehaviour` implementation. Users need to write the wiring code by hand to e.g. enable | ||
| Kademlia to learn protocols supported by a remote peer from Identify. | ||
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| This roadmap item contains exchanging standard information about remote peers (e.g. supported | ||
| protocols) between `NetworkBehaviour` implementations. | ||
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| Long term we might consider a generic approach for `NetworkBehaviours` to exchange data. Though that | ||
| would deserve its own roadmap item. | ||
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| ## Generic connection management | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |----------------------|--------|-------------------|---------------------------------------------------|--------------|------------| | ||
| | Developer Ergonomics | todo | Q1/2023 | https://github.com/libp2p/rust-libp2p/issues/2824 | | | | ||
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| Today connection management functionality in rust-libp2p is limited. Building abstractions on top is | ||
| cumbersome and inefficient. See https://github.com/libp2p/rust-libp2p/issues/2824. Making connection | ||
| management generic allows users to build advanced and efficient abstractions on top of rust-libp2p | ||
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| First draft is in https://github.com/libp2p/rust-libp2p/pull/2828 | ||
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| ## Kademlia efficient querying | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|-------------|-------------------|-------------------------------------------------|--------------|------------| | ||
| | Optimization | in progress | Q1/2023 | https://github.com/libp2p/rust-libp2p/pull/2712 | | | | ||
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| Users of rust-libp2p like [iroh](https://github.com/n0-computer/iroh) need this for low latency | ||
| usage of `libp2p-kad`. The rust-libp2p maintainers can pick this up unless iroh folks finish the | ||
| work before that. | ||
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| ## Kademlia client mode | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|--------|-------------------|---------------------------------------------------|-----------------------------------------------------------------|------------| | ||
| | Optimization | todo | Q1/2023 | https://github.com/libp2p/rust-libp2p/issues/2032 | [Cross behaviour communication](#cross-behaviour-communication) | | | ||
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| Kademlia client mode will enhance routing table health and thus have a positive impact on all | ||
| Kademlia operations. | ||
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| ## Optimize Hole punching | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|--------|-------------------|----------|--------------|------------| | ||
| | Optimization | todo | Q1/2023 | | | | | ||
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| We released hole punching support with [rust-libp2p | ||
| `v0.43.0`](https://github.com/libp2p/rust-libp2p/releases/tag/v0.43.0), see also | ||
| https://github.com/libp2p/rust-libp2p/issues/2052. We are currently collecting data via the | ||
| [punchr](https://github.com/dennis-tra/punchr) project on the hole punching success rate. See also | ||
| [call for | ||
| action](https://discuss.libp2p.io/t/decentralized-nat-hole-punching-measurement-campaign/1616) in | ||
| case you want to help. Based on this data we will likely find many optimizations we can do to our | ||
| hole punching stack. | ||
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| ## Streaming response protocol aka. the ultimate escape hatch | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |----------------------|--------|-------------------|---------------------------------------------------|--------------|------------| | ||
| | Developer ergonomics | todo | Q1/2023 | https://github.com/libp2p/rust-libp2p/issues/2657 | | | | ||
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| rust-libp2p is very opinionated on how to write peer-to-peer protocols. There are many good reasons | ||
| for this, and I think we should not change directions here. That said, the ultimate escape hatch - | ||
| allowing users to create a stream and do whatever they want with it - will make it easier for | ||
| newcomers to get started. | ||
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| ## Improved WASM support | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |----------------------|--------|-------------------|---------------------------------------------------|--------------|--------------------------------------------| | ||
| | Developer ergonomics | todo | Q2/2023 | https://github.com/libp2p/rust-libp2p/issues/2617 | | WebRTC browser-to-browser and browser side | | ||
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| The project supports WASM already today, though the developer experience is cumbersome at best. | ||
| Properly supporting WASM opens rust-libp2p to hole new set of use-cases. I would love for this to | ||
| happen earlier. Though (a) I think we should prioritize improving existing functionality over new | ||
| functionality and (b) we don't have high demand for this feature from the community. (One could | ||
| argue that that demand follows this roadmap item and not the other way round.) | ||
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| ## Handshake optimizations | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |--------------|--------|-------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|--------------|------------| | ||
| | Optimization | todo | Q2/2023 | Security protocol in multiaddr https://github.com/libp2p/specs/pull/353 and early muxer negotiation https://github.com/libp2p/rust-libp2p/issues/2994 | | | | ||
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| Short term, investing into rust-libp2p's QUIC support will likely give us a larger performance win, | ||
| thus neither of the two optimizations is planned for 2022. While great to have, it has not been | ||
| requested from any rust-libp2p users. | ||
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| Long term, given that this will give us a great performance gain, we should definitely tackle it. It | ||
| also allows us to catch up and thus be consistent with go-libp2p. | ||
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| ## Bitswap implementation | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |----------|--------|-------------------|---------------------------------------------------|--------------|------------| | ||
| | | todo | | https://github.com/libp2p/rust-libp2p/issues/2632 | | | | ||
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| I think this is a common component that many users need to build peer-to-peer applications. In | ||
| addition, it is very performance critical and thus likely challenges many of our existing designs in | ||
| rust-libp2p. | ||
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| I would prioritize it below [handshake optimization](#handshake-optimizations) following the | ||
| convention of improving existing components over introducing new ones. Users have and can implement | ||
| their own implementations and are thus not blocked on the rust-libp2p project. | ||
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| ## WebTransport | ||
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| | Category | Status | Target Completion | Tracking | Dependencies | Dependents | | ||
| |-----------------------------|--------|-------------------|---------------------------------------------------|------------------------------------|------------| | ||
| | Connectivity / optimization | todo | | https://github.com/libp2p/rust-libp2p/issues/2993 | [QUIC](#experimental-quic-support) | | | ||
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| A WebTransport implementation in rust-libp2p will enable browsers to connect to rust-libp2p nodes | ||
| where the latter only have a self-signed TLS certificate. Compared to WebRTC, this would likely be | ||
| more performant. It is dependent on QUIC support in rust-libp2p. Given that we will support WebRTC | ||
| (browser-to-server) this is not a high priority. |