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bittorrent-codex-docs/10 Notes/Block Storage.md

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tags related
codex/block-storage
Uploading and downloading content in Codex
Codex Blocks
Codex Block Exchange Protocol

#codex/block-storage

related Uploading and downloading content in Codex, Codex Blocks, Codex Block Exchange Protocol

To store blocks and the corresponding metadata, we use RepoStore.

RepoStore is a proxy to two underlying stores:

  • repoDS - to store the blocks themselves - by default it is FSDatastore as indicated by option repoKind in CodexConf (codex/conf.nim). Other types of storage are also available: SQLiteDatastore, LevelDbDatastore.
  • metaDS - to store the blocks' metadata - LevelDbDatastore (vendor/nim-datastore/datastore/leveldb/leveldbds.nim).

The stores are initialized in CodexServer.new (codex/codex.nim) and injected into repoStore (type RepoStore defined in codex/stores/repostore/types.nim):

repoStore = RepoStore.new(
  repoDs = repoData,
  metaDs = LevelDbDatastore.new(config.dataDir / CodexMetaNamespace).expect(
    "Should create metadata store!"
  ),
  quotaMaxBytes = config.storageQuota,
  blockTtl = config.blockTtl,
)

The default value for storageQuota is given by config.storageQuota and config.blockTtl (codex/stores/repostore/types.nim):

const
  DefaultBlockTtl* = 24.hours
  DefaultQuotaBytes* = 8.GiBs

repoStore together with engine (BlockExcEngine) are parts of NetworkStore, which together with switch, engine, discovery, and prover is then provided to codexNode (CodexNodeRef).