75 lines
2.1 KiB
Nim
75 lines
2.1 KiB
Nim
# Nimbus
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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) or
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# http://www.apache.org/licenses/LICENSE-2.0)
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# * MIT license ([LICENSE-MIT](LICENSE-MIT) or
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# http://opensource.org/licenses/MIT)
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# at your option. This file may not be copied, modified, or distributed
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# except according to those terms.
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import
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std/options,
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chronos,
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eth/[common/eth_types, p2p],
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"../../.."/[protocol, types],
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../../worker_desc,
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./com_error
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{.push raises: [Defect].}
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logScope:
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topics = "snap-fetch"
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc getBlockHeader*(
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buddy: SnapBuddyRef;
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num: BlockNumber;
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): Future[Result[BlockHeader,ComError]]
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{.async.} =
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## Get single block header
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let
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peer = buddy.peer
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reqLen = 1u
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hdrReq = BlocksRequest(
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startBlock: HashOrNum(
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isHash: false,
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number: num),
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maxResults: reqLen,
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skip: 0,
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reverse: false)
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trace trEthSendSendingGetBlockHeaders, peer, startBlock=num, reqLen
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var hdrResp: Option[blockHeadersObj]
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try:
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hdrResp = await peer.getBlockHeaders(hdrReq)
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except CatchableError as e:
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trace trSnapRecvError & "waiting for GetByteCodes reply", peer,
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error=e.msg
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return err(ComNetworkProblem)
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var hdrRespLen = 0
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if hdrResp.isSome:
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hdrRespLen = hdrResp.get.headers.len
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if hdrRespLen == 0:
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trace trEthRecvReceivedBlockHeaders, peer, reqLen, respose="n/a"
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return err(ComNoHeaderAvailable)
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if hdrRespLen == 1:
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let
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header = hdrResp.get.headers[0]
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blockNumber = header.blockNumber
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trace trEthRecvReceivedBlockHeaders, peer, hdrRespLen, blockNumber
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return ok(header)
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trace trEthRecvReceivedBlockHeaders, peer, reqLen, hdrRespLen
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return err(ComTooManyHeaders)
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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