53 lines
1.5 KiB
Nim
53 lines
1.5 KiB
Nim
# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[hashes, options, tables]
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import pkg/cps
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import preserves
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import ./[actors, patterns, skeletons]
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from ./protocols/protocol import Handle
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from ./protocols/dataspace import Observe
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type
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Dataspace {.final.} = ref object of Entity
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index: Index
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handleMap: Table[Handle, Value]
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proc dsPublish(e: Entity; v: Value; h: Handle) {.cps: Cont.} =
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var ds = Dataspace(e)
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if ds.index.add(v):
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var obs = v.preservesTo(Observe)
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if obs.isSome and obs.get.observer of Cap:
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ds.index.add(obs.get.pattern, Cap(obs.get.observer))
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ds.handleMap[h] = v
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proc dsRetract(e: Entity; h: Handle) {.cps: Cont.} =
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var ds = Dataspace(e)
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var v = ds.handleMap[h]
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if ds.index.remove(v):
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ds.handleMap.del h
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var obs = v.preservesTo(Observe)
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if obs.isSome and obs.get.observer of Cap:
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ds.index.remove(obs.get.pattern, Cap(obs.get.observer))
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proc dsMessage(e: Entity; v: Value) {.cps: Cont.} =
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var ds = Dataspace(e)
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ds.index.deliverMessage(v)
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proc newDataspace*(f: Facet): Cap =
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var ds = Dataspace(
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index: initIndex(),
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).setActions(
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publish = whelp dsPublish,
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retract = whelp dsRetract,
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message = whelp dsMessage,
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)
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newCap(f, ds)
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proc observe*(cap: Cap; pat: Pattern; peer: Cap): Handle =
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publish(cap, Observe(pattern: pat, observer: peer))
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proc observe*(cap: Cap; pat: Pattern; e: Entity): Handle =
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observe(cap, pat, newCap(cap.relay, e))
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