161 lines
3.9 KiB
Nim
161 lines
3.9 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 std/os
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import pkg/chronos
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import pkg/chronicles
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import pkg/libp2p
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import pkg/questionable
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import pkg/questionable/results
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import pkg/stew/io2
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import ./cachestore
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import ./blockstore
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export blockstore
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logScope:
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topics = "codex fsstore"
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type
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FSStore* = ref object of BlockStore
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cache: BlockStore
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repoDir: string
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postfixLen*: int
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template blockPath*(self: FSStore, cid: Cid): string =
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self.repoDir / ($cid)[^self.postfixLen..^1] / $cid
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method getBlock*(
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self: FSStore,
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cid: Cid): Future[?!Block] {.async.} =
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## Get a block from the stores
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##
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return cid.emptyBlock.success
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if cid in self.cache:
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return await self.cache.getBlock(cid)
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if cid notin self:
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return Block.failure("Couldn't find block in fs store")
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var data: seq[byte]
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let path = self.blockPath(cid)
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if (
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let res = io2.readFile(path, data);
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res.isErr):
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let error = io2.ioErrorMsg(res.error)
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trace "Cannot read file from fs store", path , error
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return Block.failure("Cannot read file from fs store")
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return Block.new(cid, data)
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method putBlock*(
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self: FSStore,
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blk: Block): Future[bool] {.async.} =
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## Put a block to the blockstore
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##
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if blk.isEmpty:
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trace "Empty block, ignoring"
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return true
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if blk.cid in self:
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return true
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# if directory exists it wont fail
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if io2.createPath(self.blockPath(blk.cid).parentDir).isErr:
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trace "Unable to create block prefix dir", dir = self.blockPath(blk.cid).parentDir
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return false
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let path = self.blockPath(blk.cid)
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if (
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let res = io2.writeFile(path, blk.data);
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res.isErr):
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let error = io2.ioErrorMsg(res.error)
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trace "Unable to store block", path, cid = blk.cid, error
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return false
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if not (await self.cache.putBlock(blk)):
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trace "Unable to store block in cache", cid = blk.cid
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return true
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method delBlock*(
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self: FSStore,
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cid: Cid): Future[?!void] {.async.} =
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## Delete a block from the blockstore
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##
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trace "Deleting block from filestore", cid
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return success()
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let
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path = self.blockPath(cid)
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res = io2.removeFile(path)
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if res.isErr:
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let errmsg = io2.ioErrorMsg(res.error)
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trace "Unable to delete block", path, cid, errmsg
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return errmsg.failure
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return await self.cache.delBlock(cid)
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method hasBlock*(self: FSStore, cid: Cid): bool =
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## Check if the block exists in the blockstore
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##
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trace "Checking for block existence", cid
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if cid.isEmpty:
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trace "Empty block, ignoring"
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return true
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self.blockPath(cid).isFile()
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method listBlocks*(self: FSStore, onBlock: OnBlock) {.async.} =
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debug "Listing all blocks in store"
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for (pkind, folderPath) in self.repoDir.walkDir():
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if pkind != pcDir: continue
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let baseName = basename(folderPath)
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if baseName.len != self.postfixLen: continue
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for (fkind, filePath) in folderPath.walkDir(false):
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if fkind != pcFile: continue
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let cid = Cid.init(basename(filePath))
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if cid.isOk:
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# getting a weird `Error: unhandled exception: index 1 not in 0 .. 0 [IndexError]`
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# compilation error if using different syntax/construct bellow
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try:
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await onBlock(cid.get())
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except CancelledError as exc:
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trace "Cancelling list blocks"
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raise exc
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except CatchableError as exc:
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trace "Couldn't get block", cid = $(cid.get())
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proc new*(
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T: type FSStore,
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repoDir: string,
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postfixLen = 2,
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cache: BlockStore = CacheStore.new()): T =
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T(
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postfixLen: postfixLen,
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repoDir: repoDir,
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cache: cache)
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