IPFS Block Layer

Concept

• blocks
  block是一个包含data和cid的结构，go-block-format中定义了Block接口，和一个BasicBlock；
  // Package blocks contains the lowest level of IPLD data structures.
  // A block is raw data accompanied by a CID. The CID contains the multihash
  // corresponding to the block.

• Blockstore
  Blockstore基本上就是个k-v数据库，根据CID存取block
  go-ipfs-blockstore中定义了Blockstore接口，以及GCBlockStore接口，GCBlockstore继承了Blockstore；应该看一下GCBlockstore规定需要实现的方法；
  // Package blockstore implements a thin wrapper over a datastore, giving a
  // clean interface for Getting and Putting block objects.

• BlockService
  go-blockservice中定义了BlockService的接口，用于给DAG层提供服务
  // package blockservice implements a BlockService interface that provides
  // a single GetBlock/AddBlock interface that seamlessly retrieves data either
  // locally or from a remote peer through the exchange.

Note

这些概念位于IPFS的Blcok层；顺带说一下，这一层只负责以k-v方式存取block，不知道block之间的结构和关系；