102 lines
2.5 KiB
Nim
102 lines
2.5 KiB
Nim
## Nim-Codex
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## Copyright (c) 2021 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import pkg/upraises
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push: {.upraises: [].}
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import pkg/chronicles
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import pkg/chronos
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import pkg/libp2p
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import ../blocktype as bt
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import ../utils/asyncheapqueue
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import ./blockstore
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import ../blockexchange
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export blockstore, blockexchange, asyncheapqueue
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logScope:
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topics = "codex networkstore"
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type
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NetworkStore* = ref object of BlockStore
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engine*: BlockExcEngine # blockexc decision engine
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localStore*: BlockStore # local block store
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method getBlock*(self: NetworkStore, cid: Cid): Future[?! (? bt.Block)] {.async.} =
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## Get a block from a remote peer
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##
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trace "Getting block from network store", cid
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let blk = await self.localStore.getBlock(cid)
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if blk.isErr:
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return blk
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if blk.get.isSome:
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trace "Retrieved block from local store", cid
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return blk
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trace "Block not found in local store", cid
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try:
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# TODO: What if block isn't available in the engine too?
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let blk = await self.engine.requestBlock(cid)
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# TODO: add block to the local store
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return blk.some.success
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except CatchableError as exc:
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trace "Exception requesting block", cid, exc = exc.msg
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return failure(exc)
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method putBlock*(self: NetworkStore, blk: bt.Block): Future[?!void] {.async.} =
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## Store block locally and notify the network
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##
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trace "Puting block into network store", cid = blk.cid
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let res = await self.localStore.putBlock(blk)
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if res.isErr:
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return res
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await self.engine.resolveBlocks(@[blk])
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return success()
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method delBlock*(self: NetworkStore, cid: Cid): Future[?!void] =
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## Delete a block from the blockstore
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##
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trace "Deleting block from network store", cid
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return self.localStore.delBlock(cid)
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{.pop.}
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method hasBlock*(self: NetworkStore, cid: Cid): Future[?!bool] {.async.} =
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## Check if the block exists in the blockstore
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##
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trace "Checking network store for block existence", cid
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return await self.localStore.hasBlock(cid)
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method close*(self: NetworkStore): Future[void] {.async.} =
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## Close the underlying local blockstore
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##
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if not self.localStore.isNil: await self.localStore.close
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proc new*(
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T: type NetworkStore,
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engine: BlockExcEngine,
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localStore: BlockStore): T =
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let b = NetworkStore(
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localStore: localStore,
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engine: engine)
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return b
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