57 lines
1.8 KiB
Nim
57 lines
1.8 KiB
Nim
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# 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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{.push raises: [].}
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import
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std/[os, strutils],
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chronicles,
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eth/[common, p2p]
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logScope:
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topics = "sync-ctrl"
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# ------------------------------------------------------------------------------
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# Private functions
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# ------------------------------------------------------------------------------
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proc getDataLine(name: string): string {.gcsafe, raises: [IOError].} =
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if name.fileExists:
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let file = name.open
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defer: file.close
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return (file.readAll.splitLines)[0].strip
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# ------------------------------------------------------------------------------
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# Public functions
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# ------------------------------------------------------------------------------
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proc syncCtrlBlockNumberFromFile*(
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fileName: Option[string];
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): Result[BlockNumber,void] =
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## Returns a block number from the file name argument `fileName`. The first
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## line of the file is parsed as a decimal encoded block number.
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if fileName.isSome:
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let file = fileName.get
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try:
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let data = file.getDataLine
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if 0 < data.len:
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let num = parse(data,UInt256)
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return ok(num.toBlockNumber)
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except CatchableError as e:
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let
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name {.used.} = $e.name
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msg {.used.} = e.msg
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debug "Exception while parsing block number", file, name, msg
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err()
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# ------------------------------------------------------------------------------
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# End
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# ------------------------------------------------------------------------------
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