163 lines
4.6 KiB
Nim
163 lines
4.6 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 std/tables
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import std/monotimes
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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 pkg/metrics
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import pkg/questionable/results
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import ../protobuf/blockexc
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import ../../blocktype
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import ../../merkletree
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logScope:
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topics = "codex pendingblocks"
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declareGauge(codex_block_exchange_pending_block_requests, "codex blockexchange pending block requests")
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declareGauge(codex_block_exchange_retrieval_time_us, "codex blockexchange block retrieval time us")
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const
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DefaultBlockTimeout* = 10.minutes
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type
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BlockReq* = object
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handle*: Future[Block]
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inFlight*: bool
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startTime*: int64
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PendingBlocksManager* = ref object of RootObj
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blocks*: Table[BlockAddress, BlockReq] # pending Block requests
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proc updatePendingBlockGauge(p: PendingBlocksManager) =
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codex_block_exchange_pending_block_requests.set(p.blocks.len.int64)
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proc getWantHandle*(
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p: PendingBlocksManager,
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address: BlockAddress,
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timeout = DefaultBlockTimeout,
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inFlight = false
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): Future[Block] {.async.} =
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## Add an event for a block
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##
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try:
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if address notin p.blocks:
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p.blocks[address] = BlockReq(
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handle: newFuture[Block]("pendingBlocks.getWantHandle"),
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inFlight: inFlight,
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startTime: getMonoTime().ticks)
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trace "Adding pending future for block", address, inFlight = p.blocks[address].inFlight
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p.updatePendingBlockGauge()
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return await p.blocks[address].handle.wait(timeout)
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except CancelledError as exc:
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trace "Blocks cancelled", exc = exc.msg, address
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raise exc
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except CatchableError as exc:
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trace "Pending WANT failed or expired", exc = exc.msg
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# no need to cancel, it is already cancelled by wait()
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raise exc
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finally:
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p.blocks.del(address)
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p.updatePendingBlockGauge()
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proc getWantHandle*(
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p: PendingBlocksManager,
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cid: Cid,
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timeout = DefaultBlockTimeout,
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inFlight = false
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): Future[Block] =
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p.getWantHandle(BlockAddress.init(cid), timeout, inFlight)
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proc resolve*(
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p: PendingBlocksManager,
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blocksDelivery: seq[BlockDelivery]
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) {.gcsafe, raises: [].} =
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## Resolve pending blocks
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##
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for bd in blocksDelivery:
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p.blocks.withValue(bd.address, blockReq):
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trace "Resolving block", address = bd.address
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if not blockReq.handle.finished:
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let
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startTime = blockReq.startTime
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stopTime = getMonoTime().ticks
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retrievalDurationUs = (stopTime - startTime) div 1000
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blockReq.handle.complete(bd.blk)
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codex_block_exchange_retrieval_time_us.set(retrievalDurationUs)
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trace "Block retrieval time", retrievalDurationUs, address = bd.address
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else:
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trace "Block handle already finished", address = bd.address
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do:
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warn "Attempting to resolve block that's not currently a pending block", address = bd.address
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proc setInFlight*(p: PendingBlocksManager,
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address: BlockAddress,
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inFlight = true) =
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p.blocks.withValue(address, pending):
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pending[].inFlight = inFlight
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trace "Setting inflight", address, inFlight = pending[].inFlight
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proc isInFlight*(p: PendingBlocksManager,
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address: BlockAddress,
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): bool =
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p.blocks.withValue(address, pending):
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result = pending[].inFlight
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trace "Getting inflight", address, inFlight = result
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proc contains*(p: PendingBlocksManager, cid: Cid): bool =
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BlockAddress.init(cid) in p.blocks
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proc contains*(p: PendingBlocksManager, address: BlockAddress): bool =
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address in p.blocks
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iterator wantList*(p: PendingBlocksManager): BlockAddress =
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for a in p.blocks.keys:
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yield a
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iterator wantListBlockCids*(p: PendingBlocksManager): Cid =
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for a in p.blocks.keys:
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if not a.leaf:
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yield a.cid
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iterator wantListCids*(p: PendingBlocksManager): Cid =
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var yieldedCids = initHashSet[Cid]()
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for a in p.blocks.keys:
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let cid = a.cidOrTreeCid
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if cid notin yieldedCids:
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yieldedCids.incl(cid)
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yield cid
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iterator wantHandles*(p: PendingBlocksManager): Future[Block] =
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for v in p.blocks.values:
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yield v.handle
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proc wantListLen*(p: PendingBlocksManager): int =
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p.blocks.len
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func len*(p: PendingBlocksManager): int =
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p.blocks.len
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func new*(T: type PendingBlocksManager): PendingBlocksManager =
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PendingBlocksManager()
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