111 lines
2.7 KiB
Nim
111 lines
2.7 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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import pkg/upraises
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push: {.upraises: [].}
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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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import ./seekablestream
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export stores, blocktype, manifest, chronos
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logScope:
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topics = "dagger storestream"
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type
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StoreStream* = ref object of SeekableStream
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store*: BlockStore
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manifest*: Manifest
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emptyBlock*: seq[byte]
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proc new*(
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T: type StoreStream,
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store: BlockStore,
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manifest: Manifest): T =
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result = T(
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store: store,
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manifest: manifest,
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offset: 0,
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emptyBlock: newSeq[byte](manifest.blockSize))
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result.initStream()
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method `size`*(self: StoreStream): int =
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self.manifest.len * self.manifest.blockSize
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proc `size=`*(self: StoreStream, size: int)
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{.error: "Setting the size is forbidden".} =
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discard
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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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trace "Reading from manifest", cid = self.manifest.cid.get(), blocks = self.manifest.len
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while read < nbytes and not self.atEof:
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let
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pos = self.offset div self.manifest.blockSize
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blk = (await self.store.getBlock(self.manifest[pos])).tryGet()
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blockOffset =
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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 =
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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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trace "Reading bytes from store stream", pos, cid = blk.cid, bytes = readBytes, blockOffset = blockOffset
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copyMem(
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pbytes.offset(read),
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if blk.isEmpty:
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self.emptyBlock[blockOffset].addr
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else:
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blk.data[blockOffset].addr,
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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"
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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", msg = exc.msg
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await procCall LPStream(self).closeImpl()
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