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Improve offline IPNS (record) support

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需要澄清
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调研方向

首先审查 go-libp2p-kad-dht PR 291 中的依赖项,以及当前的 IPNS 解析和发布流程。定义本地缓存的记录、流式 best-effort 结果、离线发布和断开网络时的行为应如何交互。完成的标准是:该行为在离线和在线状态下都能正常工作,且不会破坏 IPNS 解析。

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描述

enhancement

Libp2p should have better offline/disconnected-network record support:

  • On resolve, IPNS records should be cached locally. This will:
    • Help with streaming resolve. Peers searching for popular records will get back "best effort" results along the way. We still won't be able to stop the search early as these "best effort" copies of the records won't be updated but it can help.
    • Help with offline situations. If a node resolves a record while online, they'll continue to have a copy of that record when offline. It may not be up-to-date but it's better than nothing.
    • Help with resolving on a disconnected network. If a subset of nodes "become" the entire DHT, they'll have all the records they've resolved recently.
  • Users should be allowed to publish DHT records while offline (or in a disconnected network). DHT rebalancing (to be implemented) should take care of moving these records to the right place at the end of the day.

Dependencies:

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