nimbus-eth1/fluffy/eth_data/yaml_utils.nim

75 lines
2.0 KiB
Nim

# fluffy
# Copyright (c) 2024 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
import std/streams, yaml, results
export yaml
type YamlPortalContent* = object
content_key*: string
content_value*: string
proc loadFromYaml*(T: type, file: string): Result[T, string] =
let s =
try:
openFileStream(file)
except IOError as e:
return err(e.msg)
defer:
try:
close(s)
except Exception as e:
raiseAssert(e.msg)
var res: T
try:
{.gcsafe.}:
yaml.load(s, res)
except YamlConstructionError as e:
return err(e.msg)
except YamlParserError as e:
return err(e.msg)
except OSError as e:
return err(e.msg)
except IOError as e:
return err(e.msg)
ok(res)
proc dumpToYaml*[T](value: T, file: string): Result[void, string] =
# These are the default options aside from outputVersion which is set to none.
const options = PresentationOptions(
containers: cMixed,
indentationStep: 2,
newlines: nlOSDefault,
outputVersion: ovNone,
maxLineLength: some(80),
directivesEnd: deIfNecessary,
suppressAttrs: false,
quoting: sqUnset,
condenseFlow: true,
explicitKeys: false,
)
let s = newFileStream(file, fmWrite)
defer:
try:
close(s)
except Exception as e:
raiseAssert(e.msg)
try:
{.gcsafe.}:
# Dump to yaml, avoiding TAGS and YAML version directives.
dump(value, s, tagStyle = tsNone, options = options, handles = @[])
except YamlPresenterJsonError as e:
return err(e.msg)
except YamlSerializationError as e:
return err(e.msg)
except YamlPresenterOutputError as e:
return err(e.msg)
ok()