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feat(backend): Python gateway client that fetches by CID and verifies content

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调研方向

Start by reading dependency issue #59 and locating the Python content layer and its pytest setup; the payload does not name specific files. Implement a gateway read client that fetches /ipfs/<cid> with timeouts and size limits, recomputes raw or JSON CIDs, and raises distinct unavailable and mismatch errors. Add mocked response tests for matching and tampered content, plus an outage test; done means valid bytes are returned and each failure has the specified error.

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描述

enhancement kubo storage tier-2

Summary

A read-side client so the coordinator and workers can fetch content (for example a circuit by CID) over HTTP and check the hash.

Estimated size: S

Motivation

The cheapest bridge between the Python compute plane and IPFS, with no libp2p interop needed.

Proposal

  • Fetch /ipfs/<cid> from the configured gateway with timeouts and size limits.
  • Recompute the CID of the received bytes (raw and JSON codecs first) and reject mismatches.
  • Typed errors: unavailable vs mismatch.

Acceptance criteria

  • A matching fetch returns bytes; a tampered response raises a mismatch error.
  • Gateway outage raises unavailable, not mismatch.

Out of scope

  • Writing content (see the Kubo RPC client).

Dependencies

  • #59

Testing plan

  • pytest with mocked gateway responses including tampered bytes.

Part of #43. Ground rules for the content layer: no secrets in the repo, content-layer failures must never block or discard quantum execution, and tests and docs ship with every PR.

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环境准备

  • 提供 Dockerfile 或 Docker Compose 文件
  • 没有 Pull Request 模板
  • 没有贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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