96 lines
2.2 KiB
Nim
96 lines
2.2 KiB
Nim
## Nim-Dagger
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## Copyright (c) 2022 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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{.push raises: [Defect].}
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import pkg/libp2p
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import pkg/chronos
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import pkg/chronicles
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import pkg/stew/ptrops
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import ./stores
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import ./manifest
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import ./blocktype
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export stores
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logScope:
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topics = "dagger storestream"
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type
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ReadPattern* {.pure.} = enum
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Sequential,
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Grid
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StoreStream* = ref object of LPStream
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store*: BlockStore
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manifest*: Manifest
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pattern*: ReadPattern
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offset*: int
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proc init*(
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T: type StoreStream,
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store: BlockStore,
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manifest: Manifest,
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pattern = ReadPattern.Sequential): T =
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result = T(
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store: store,
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manifest: manifest,
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pattern: pattern,
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offset: 0)
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result.initStream()
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method readOnce*(
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self: StoreStream,
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pbytes: pointer,
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nbytes: int): Future[int] {.async.} =
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if self.atEof:
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raise newLPStreamEOFError()
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var
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read = 0
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while read < nbytes and self.atEof.not:
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let
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pos = self.offset div self.manifest.blockSize
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let
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blk = (await self.store.getBlock(self.manifest[pos])).tryGet()
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blockOffset = if self.offset >= self.manifest.blockSize:
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self.offset mod self.manifest.blockSize
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else:
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self.offset
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readBytes = if (nbytes - read) >= (self.manifest.blockSize - blockOffset):
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self.manifest.blockSize - blockOffset
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else:
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min(nbytes - read, self.manifest.blockSize)
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copyMem(pbytes.offset(read), unsafeAddr blk.data[blockOffset], readBytes)
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self.offset += readBytes
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read += readBytes
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return read
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method atEof*(self: StoreStream): bool =
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self.offset >= self.manifest.len * self.manifest.blockSize
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method closeImpl*(self: StoreStream) {.async.} =
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try:
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trace "Closing StoreStream", self
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self.offset = self.manifest.len * self.manifest.blockSize # set Eof
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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trace "Error closing StoreStream", s, msg = exc.msg
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await procCall LPStream(self).closeImpl()
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