mirror of https://github.com/waku-org/nwaku.git
57 lines
1.6 KiB
Nim
57 lines
1.6 KiB
Nim
## Collection of utilities related to namespaced topics
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## Implemented according to the specified Waku v2 Topic Usage Recommendations
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## More at https://rfc.vac.dev/spec/23/
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{.push raises: [Defect]}
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import
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std/strutils,
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stew/results
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type
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NamespacedTopic* = object
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application*: string
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version*: string
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topicName*: string
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encoding*: string
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NamespacingResult*[T] = Result[T, string]
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proc fromString*(T: type NamespacedTopic, topic: string): NamespacingResult[NamespacedTopic] =
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## Splits a namespaced topic string into its constituent parts.
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## The topic string has to be in the format `/<application>/<version>/<topic-name>/<encoding>`
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let parts = topic.split('/')
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if parts.len != 5:
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# Check that we have an expected number of substrings
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return err("invalid topic format")
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if parts[0] != "":
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# Ensures that topic starts with a "/"
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return err("invalid topic format")
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let namespacedTopic= NamespacedTopic(application: parts[1],
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version: parts[2],
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topicName: parts[3],
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encoding: parts[4])
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return ok(namespacedTopic)
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proc `$`*(namespacedTopic: NamespacedTopic): string =
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## Returns a string representation of a namespaced topic
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## in the format `/<application>/<version>/<topic-name>/<encoding>`
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var topicStr = newString(0)
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topicStr.add("/")
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topicStr.add(namespacedTopic.application)
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topicStr.add("/")
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topicStr.add(namespacedTopic.version)
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topicStr.add("/")
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topicStr.add(namespacedTopic.topicName)
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topicStr.add("/")
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topicStr.add(namespacedTopic.encoding)
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return topicStr
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