662 lines
20 KiB
Nim
662 lines
20 KiB
Nim
# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[deques, hashes, monotimes, options, sets, tables, times]
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import pkg/cps
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import pkg/sys/ioqueue
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import preserves
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import ../syndicate/protocols/[protocol, sturdy]
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const tracing = defined(traceSyndicate)
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when tracing:
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import std/streams
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from std/os import getEnv
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import ./protocols/trace
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export Handle
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type
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Oid = sturdy.Oid
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Caveat = sturdy.Caveat
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Attenuation = seq[Caveat]
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Rewrite = sturdy.Rewrite
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AssertionRef* = ref object
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value*: Value
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# if the Enity methods take a Value object then the generated
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# C code has "redefinition of struct" problems when orc is enabled
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Entity* = ref object of RootObj
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facet*: Facet
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oid*: Oid # oid is how Entities are identified over the wire
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Cap* {.preservesEmbedded.} = ref object of EmbeddedObj
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target*: Entity
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relay*: Facet
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# Entity has facet but a Cap is also scoped to a relay Facet
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attenuation*: Attenuation
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Ref* {.deprecated: "Ref was renamed to Cap".} = Cap
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OutboundAssertion = ref object
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handle: Handle
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peer: Cap
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established: bool
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OutboundTable = Table[Handle, OutboundAssertion]
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Actor* = ref object
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next: Actor
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name: string
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handleAllocator: ref Handle
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# a fresh actor gets a new ref Handle and
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# all actors spawned from it get the same ref.
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root: Facet
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exitReason: ref Exception
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exitHooks: seq[TurnAction]
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id: ActorId
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facetIdAllocator: uint
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exiting, exited: bool
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TurnAction* = proc (t: var Turn) {.closure.}
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Turn* = ref object
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facet: Facet # active facet that may change during a turn
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work: Deque[tuple[facet: Facet, act: TurnAction]]
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effects: seq[Turn]
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when tracing:
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desc: TurnDescription
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Facet* = ref FacetObj
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FacetObj = object
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actor*: Actor
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parent: Facet
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children: HashSet[Facet]
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outbound: OutboundTable
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shutdownActions: seq[TurnAction]
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inertCheckPreventers: int
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id: FacetId
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isAlive: bool
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var turnQueue {.threadvar.}: Deque[Turn]
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when tracing:
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proc openTraceStream: FileStream =
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let path = getEnv("SYNDICATE_TRACE_FILE")
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case path
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of "": stderr.writeLine "$SYNDICATE_TRACE_FILE unset"
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of "-": result = newFileStream(stderr)
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else: result = openFileStream(path, fmWrite)
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let traceStream = openTraceStream()
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var turnIdAllocator: uint
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proc nextTurnId(): TurnId =
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inc(turnIdAllocator)
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turnIdAllocator.toPreserves
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proc trace(actor: Actor; act: ActorActivation) =
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if not traceStream.isNil:
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var entry = TraceEntry(
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timestamp: getTime().toUnixFloat(),
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actor: initRecord("named", actor.name.toPreserves),
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item: act)
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traceStream.write(entry.toPreserves)
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proc path(facet: Facet): seq[trace.FacetId] =
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var f = facet
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while not f.isNil:
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result.add f.id.toPreserves
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f = f.parent
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method publish*(e: Entity; turn: var Turn; v: AssertionRef; h: Handle) {.base.} = discard
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method retract*(e: Entity; turn: var Turn; h: Handle) {.base.} = discard
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method message*(e: Entity; turn: var Turn; v: AssertionRef) {.base.} = discard
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method sync*(e: Entity; turn: var Turn; peer: Cap) {.base.} = discard
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using
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actor: Actor
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facet: Facet
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turn: var Turn
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action: TurnAction
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proc labels(f: Facet): string =
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proc catLabels(f: Facet; labels: var string) =
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labels.add ':'
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if not f.parent.isNil:
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catLabels(f.parent, labels)
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labels.add ':'
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when tracing:
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labels.add $f.id
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result.add f.actor.name
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catLabels(f, result)
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proc `$`*(f: Facet): string =
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"<Facet:" & f.labels & ">"
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proc `$`*(r: Cap): string =
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"<Ref:" & r.relay.labels & ">"
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proc `$`*(actor: Actor): string =
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"<Actor:" & actor.name & ">" # TODO: ambigous
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proc `$`*(t: Turn): string =
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"<Turn:" & $t.desc.id & ">"
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proc attenuate(r: Cap; a: Attenuation): Cap =
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if a.len == 0: result = r
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else: result = Cap(
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target: r.target,
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relay: r.relay,
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attenuation: a & r.attenuation)
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proc hash*(facet): Hash =
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facet.id.hash
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proc hash*(r: Cap): Hash = !$(r.relay.hash !& r.target.unsafeAddr.hash)
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proc actor*(turn): Actor = turn.facet.actor
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proc nextHandle(facet: Facet): Handle =
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result = succ(facet.actor.handleAllocator[])
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facet.actor.handleAllocator[] = result
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proc queueWork*(turn: var Turn; facet: Facet; act: TurnAction) =
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assert not facet.isNil
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turn.work.addLast((facet, act,))
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proc queueTurn*(facet: Facet; act: TurnAction) =
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var turn = Turn(facet: facet)
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assert not facet.isNil
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turn.work.addLast((facet, act,))
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when tracing:
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turn.desc.id = nextTurnId()
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turnQueue.addLast(turn)
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proc queueTurn*(prev: var Turn; facet: Facet; act: TurnAction) =
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var next = Turn(facet: facet)
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assert not facet.isNil
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next.work.addLast((facet, act,))
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when tracing:
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next.desc.id = nextTurnId()
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next.desc.cause = TurnCause(orKind: TurnCauseKind.turn)
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next.desc.cause.turn.id = prev.desc.id
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turnQueue.addLast(next)
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proc run*(facet: Facet; action: TurnAction) = queueTurn(facet, action)
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## Alias to queueTurn_.
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proc facet*(turn: Turn): Facet = turn.facet
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proc queueEffect*(turn: var Turn; target: Facet; act: TurnAction) =
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if target.actor == turn.facet.actor:
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turn.work.addLast((target, act,))
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else:
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var next = Turn(facet: target)
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assert not target.isNil
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next.work.addLast((target, act,))
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when tracing:
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next.desc.id = nextTurnId()
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next.desc.cause = TurnCause(orKind: TurnCauseKind.turn)
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next.desc.cause.turn.id = turn.desc.id
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turn.effects.add next
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type Bindings = Table[Value, Value]
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proc match(bindings: var Bindings; p: Pattern; v: Value): bool =
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case p.orKind
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of PatternKind.Pdiscard: result = true
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of PatternKind.Patom:
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result = case p.patom
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of PAtom.Boolean: v.isBoolean
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of PAtom.Double: v.isFloat
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of PAtom.Signedinteger: v.isInteger
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of PAtom.String: v.isString
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of PAtom.Bytestring: v.isByteString
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of PAtom.Symbol: v.isSymbol
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of PatternKind.Pembedded:
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result = v.isEmbedded
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of PatternKind.Pbind:
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if match(bindings, p.pbind.pattern, v):
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bindings[p.pbind.pattern.toPreserves] = v
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result = true
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of PatternKind.Pand:
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for pp in p.pand.patterns:
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result = match(bindings, pp, v)
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if not result: break
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of PatternKind.Pnot:
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var b: Bindings
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result = not match(b, p.pnot.pattern, v)
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of PatternKind.Lit:
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result = p.lit.value == v
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of PatternKind.PCompound:
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case p.pcompound.orKind
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of PCompoundKind.rec:
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if v.isRecord and
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p.pcompound.rec.label == v.label and
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p.pcompound.rec.fields.len == v.arity:
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result = true
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for i, pp in p.pcompound.rec.fields:
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if not match(bindings, pp, v[i]):
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result = false
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break
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of PCompoundKind.arr:
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if v.isSequence and p.pcompound.arr.items.len == v.sequence.len:
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result = true
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for i, pp in p.pcompound.arr.items:
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if not match(bindings, pp, v[i]):
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result = false
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break
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of PCompoundKind.dict:
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if v.isDictionary:
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result = true
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for key, pp in p.pcompound.dict.entries:
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let vv = step(v, key)
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if vv.isNone or not match(bindings, pp, get vv):
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result = true
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break
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proc match(p: Pattern; v: Value): Option[Bindings] =
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var b: Bindings
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if match(b, p, v):
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result = some b
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proc instantiate(t: Template; bindings: Bindings): Value =
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case t.orKind
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of TemplateKind.Tattenuate:
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let v = instantiate(t.tattenuate.template, bindings)
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let cap = v.unembed(Cap)
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if cap.isNone:
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raise newException(ValueError, "Attempt to attenuate non-capability")
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result = attenuate(get cap, t.tattenuate.attenuation).embed
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of TemplateKind.TRef:
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let n = $t.tref.binding.int
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try: result = bindings[n.toPreserves]
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except KeyError:
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raise newException(ValueError, "unbound reference: " & n)
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of TemplateKind.Lit:
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result = t.lit.value
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of TemplateKind.Tcompound:
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case t.tcompound.orKind
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of TCompoundKind.rec:
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result = initRecord(t.tcompound.rec.label, t.tcompound.rec.fields.len)
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for i, tt in t.tcompound.rec.fields:
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result[i] = instantiate(tt, bindings)
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of TCompoundKind.arr:
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result = initSequence(t.tcompound.arr.items.len)
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for i, tt in t.tcompound.arr.items:
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result[i] = instantiate(tt, bindings)
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of TCompoundKind.dict:
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result = initDictionary()
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for key, tt in t.tcompound.dict.entries:
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result[key] = instantiate(tt, bindings)
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proc rewrite(r: Rewrite; v: Value): Value =
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let bindings = match(r.pattern, v)
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if bindings.isSome:
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result = instantiate(r.template, get bindings)
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proc examineAlternatives(cav: Caveat; v: Value): Value =
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case cav.orKind
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of CaveatKind.Rewrite:
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result = rewrite(cav.rewrite, v)
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of CaveatKind.Alts:
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for r in cav.alts.alternatives:
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result = rewrite(r, v)
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if not result.isFalse: break
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of CaveatKind.Reject: discard
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of CaveatKind.unknown: discard
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proc runRewrites*(a: Attenuation; v: Value): Value =
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result = v
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for stage in a:
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result = examineAlternatives(stage, result)
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if result.isFalse: break
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proc publish(turn: var Turn; cap: Cap; v: Value; h: Handle) =
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var a = runRewrites(cap.attenuation, v)
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if not a.isFalse:
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let e = OutboundAssertion(handle: h, peer: cap)
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turn.facet.outbound[h] = e
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queueEffect(turn, cap.relay) do (turn: var Turn):
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e.established = true
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publish(cap.target, turn, AssertionRef(value: a), e.handle)
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when tracing:
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var act = ActionDescription(orKind: ActionDescriptionKind.enqueue)
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act.enqueue.event.target.actor = turn.facet.actor.id.toPreserves
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act.enqueue.event.target.facet = turn.facet.id.toPreserves
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act.enqueue.event.target.oid = cap.target.oid.toPreserves
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act.enqueue.event.detail = trace.TurnEvent(orKind: TurnEventKind.assert)
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act.enqueue.event.detail.assert.assertion.value.value =
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mapEmbeds(v) do (cap: Value) -> Value: discard
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act.enqueue.event.detail.assert.handle = h
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turn.desc.actions.add act
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proc publish*(turn: var Turn; r: Cap; a: Value): Handle {.discardable.} =
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result = turn.facet.nextHandle()
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publish(turn, r, a, result)
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proc publish*[T](turn: var Turn; r: Cap; a: T): Handle {.discardable.} =
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publish(turn, r, a.toPreserves)
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proc retract(turn: var Turn; e: OutboundAssertion) =
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queueEffect(turn, e.peer.relay) do (turn: var Turn):
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if e.established:
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e.established = false
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e.peer.target.retract(turn, e.handle)
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proc retract*(turn: var Turn; h: Handle) =
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var e: OutboundAssertion
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if turn.facet.outbound.pop(h, e):
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turn.retract(e)
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proc message*(turn: var Turn; r: Cap; v: Value) =
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var a = runRewrites(r.attenuation, v)
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if not a.isFalse:
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queueEffect(turn, r.relay) do (turn: var Turn):
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r.target.message(turn, AssertionRef(value: a))
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proc message*[T](turn: var Turn; r: Cap; v: T) =
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message(turn, r, v.toPreserves)
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proc sync(turn: var Turn; e: Entity; peer: Cap) =
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e.sync(turn, peer)
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proc sync*(turn: var Turn; r, peer: Cap) =
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queueEffect(turn, r.relay) do (turn: var Turn):
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sync(turn, r.target, peer)
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proc replace*[T](turn: var Turn; cap: Cap; h: Handle; v: T): Handle =
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result = publish(turn, cap, v)
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if h != default(Handle):
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retract(turn, h)
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proc replace*[T](turn: var Turn; cap: Cap; h: var Handle; v: T): Handle {.discardable.} =
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var old = h
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h = publish(turn, cap, v)
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if old != default(Handle):
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retract(turn, old)
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h
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proc stop*(turn: var Turn)
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proc newFacet(actor; parent: Facet; initialAssertions: OutboundTable): Facet =
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inc actor.facetIdAllocator
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result = Facet(
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id: actor.facetIdAllocator.toPreserves,
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actor: actor,
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parent: parent,
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outbound: initialAssertions,
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isAlive: true)
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if not parent.isNil: parent.children.incl result
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proc newFacet(actor; parent: Facet): Facet =
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var initialAssertions: OutboundTable
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newFacet(actor, parent, initialAssertions)
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proc isInert(facet): bool =
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let
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noKids = facet.children.len == 0
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noOutboundHandles = facet.outbound.len == 0
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isRootFacet = facet.parent.isNil
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noInertCheckPreventers = facet.inertCheckPreventers == 0
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noKids and (noOutboundHandles or isRootFacet) and noInertCheckPreventers
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proc preventInertCheck*(facet): (proc()) {.discardable.} =
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var armed = true
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inc facet.inertCheckPreventers
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proc disarm() =
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if armed:
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armed = false
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dec facet.inertCheckPreventers
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result = disarm
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proc terminate(actor; turn; reason: ref Exception)
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proc terminate(facet; turn: var Turn; orderly: bool) =
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if facet.isAlive:
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facet.isAlive = false
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let parent = facet.parent
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if not parent.isNil:
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parent.children.excl facet
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queueWork(turn, facet) do (turn: var Turn):
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while facet.children.len > 0:
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facet.children.pop.terminate(turn, orderly)
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if orderly:
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for act in facet.shutdownActions:
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act(turn)
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for a in facet.outbound.values: turn.retract(a)
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if orderly:
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if not parent.isNil:
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if parent.isInert:
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parent.terminate(turn, true)
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else:
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terminate(facet.actor, turn, nil)
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when tracing:
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var act = ActionDescription(orKind: ActionDescriptionKind.facetStop)
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act.facetstop.path = facet.path
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turn.desc.actions.add act
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proc stopIfInertAfter(action: TurnAction): TurnAction =
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# TODO: verify this
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proc wrapper(turn: var Turn) =
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action(turn)
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queueEffect(turn, turn.facet) do (turn: var Turn):
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if (not turn.facet.parent.isNil and
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(not turn.facet.parent.isAlive)) or
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turn.facet.isInert:
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stop(turn)
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wrapper
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proc newFacet(turn: var Turn): Facet = newFacet(turn.facet.actor, turn.facet)
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proc inFacet*(turn: var Turn; bootProc: TurnAction): Facet =
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result = newFacet(turn)
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let facet = turn.facet
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turn.facet = result
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when tracing:
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var act = ActionDescription(orKind: ActionDescriptionKind.facetstart)
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act.facetstart.path.add result.path
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turn.desc.actions.add act
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stopIfInertAfter(bootProc)(turn)
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turn.facet = facet
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proc facet(turn: var Turn; bootProc: TurnAction): Facet {.deprecated.} = inFacet(turn, bootProc)
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proc newActor(name: string; parent: Facet): Actor =
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result = Actor(
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name: name,
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id: name.toPreserves,
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)
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if parent.isNil:
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new result.handleAllocator
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else:
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result.handleAllocator = parent.actor.handleAllocator
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result.root = newFacet(result, parent)
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when tracing:
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var act = ActorActivation(orKind: ActorActivationKind.start)
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act.start.actorName = Name(orKind: NameKind.named)
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act.start.actorName.named.name = name.toPreserves
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trace(result, act)
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proc run(actor: Actor; bootProc: TurnAction; initialAssertions: OutboundTable) =
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queueTurn(newFacet(actor, actor.root, initialAssertions), stopIfInertAfter(bootProc))
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proc bootActor*(name: string; bootProc: TurnAction): Actor {.discardable.} =
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## Boot a top-level actor.
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result = newActor(name, nil)
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new result.handleAllocator
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var turn = Turn(facet: result.root)
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assert not result.root.isNil
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turn.work.addLast((result.root, bootProc,))
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when tracing:
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turn.desc.id = nextTurnId()
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turn.desc.cause = TurnCause(orKind: TurnCauseKind.external)
|
|
turn.desc.cause.external.description = "bootActor".toPreserves
|
|
turnQueue.addLast turn
|
|
|
|
proc spawnActor*(name: string; turn: var Turn; bootProc: TurnAction; initialAssertions = initHashSet[Handle]()): Actor {.discardable.} =
|
|
let actor = newActor(name, turn.facet)
|
|
queueEffect(turn, actor.root) do (turn: var Turn):
|
|
var newOutBound: Table[Handle, OutboundAssertion]
|
|
for key in initialAssertions:
|
|
discard turn.facet.outbound.pop(key, newOutbound[key])
|
|
when tracing:
|
|
var act = ActionDescription(orKind: ActionDescriptionKind.spawn)
|
|
act.spawn.id = actor.id.toPreserves
|
|
turn.desc.actions.add act
|
|
run(actor, bootProc, newOutBound)
|
|
actor
|
|
|
|
proc spawn*(name: string; turn: var Turn; bootProc: TurnAction; initialAssertions = initHashSet[Handle]()): Actor {.discardable.} =
|
|
spawnActor(name, turn, bootProc, initialAssertions)
|
|
|
|
type StopOnRetract = ref object of Entity
|
|
|
|
method retract*(e: StopOnRetract; turn: var Turn; h: Handle) =
|
|
stop(turn)
|
|
|
|
proc halfLink(facet, other: Facet) =
|
|
let h = facet.nextHandle()
|
|
facet.outbound[h] = OutboundAssertion(
|
|
handle: h,
|
|
peer: Cap(relay: other, target: StopOnRetract(facet: facet)),
|
|
established: true,
|
|
)
|
|
|
|
proc spawnLink*(name: string; turn: var Turn; bootProc: TurnAction; initialAssertions = initHashSet[Handle]()): Actor {.discardable.} =
|
|
result = spawnActor(name, turn, bootProc, initialAssertions)
|
|
halfLink(turn.facet, result.root)
|
|
halfLink(result.root, turn.facet)
|
|
|
|
proc newInertCap*(): Cap =
|
|
new result
|
|
let a = bootActor("inert") do (turn: Turn): turn.stop()
|
|
Cap(relay: a.root)
|
|
|
|
proc atExit*(actor; action) = actor.exitHooks.add action
|
|
|
|
proc terminate(actor; turn; reason: ref Exception) =
|
|
if not actor.exiting:
|
|
actor.exiting = true
|
|
actor.exitReason = reason
|
|
when tracing:
|
|
var act = ActorActivation(orKind: ActorActivationKind.stop)
|
|
if not reason.isNil:
|
|
act.stop.status = ExitStatus(orKind: ExitStatusKind.Error)
|
|
act.stop.status.error.message = reason.msg
|
|
trace(actor, act)
|
|
for hook in actor.exitHooks: hook(turn)
|
|
proc finish(turn: var Turn) =
|
|
assert not actor.root.isNil, actor.name
|
|
actor.root.terminate(turn, reason.isNil)
|
|
actor.exited = true
|
|
queueTurn(actor.root, finish)
|
|
|
|
proc terminate*(facet; e: ref Exception) =
|
|
run(facet.actor.root) do (turn: var Turn):
|
|
facet.actor.terminate(turn, e)
|
|
|
|
template recallFacet(turn: var Turn; body: untyped): untyped =
|
|
let facet = turn.facet
|
|
block:
|
|
body
|
|
assert facet.actor == turn.facet.actor, "turn of " & $facet.actor & " ended at " & $turn.facet.actor
|
|
turn.facet = facet
|
|
|
|
proc stopNow(turn: var Turn) =
|
|
let caller = turn.facet
|
|
recallFacet turn:
|
|
while caller.children.len > 0:
|
|
var child = caller.children.pop()
|
|
if child.actor == caller.actor:
|
|
turn.facet = child
|
|
stopNow(turn)
|
|
else:
|
|
queueEffect(turn, child, stopNow)
|
|
caller.terminate(turn, true)
|
|
|
|
proc stop*(turn: var Turn, facet: Facet) =
|
|
queueEffect(turn, facet, stopNow)
|
|
|
|
proc stop*(turn: var Turn) =
|
|
stop(turn, turn.facet)
|
|
|
|
proc onStop*(facet: Facet; act: TurnAction) =
|
|
## Add a `proc (turn: var Turn)` action to `facet` to be called as it stops.
|
|
assert not facet.isNil
|
|
add(facet.shutdownActions, act)
|
|
|
|
proc onStop*(turn: var Turn; act: TurnAction) =
|
|
onStop(turn.facet, act)
|
|
|
|
proc stop*(actor: Actor) =
|
|
queueTurn(actor.root) do (turn: var Turn):
|
|
assert(not turn.facet.isNil)
|
|
stop(turn)
|
|
|
|
proc stopActor*(facet: Facet) =
|
|
stop(facet.actor)
|
|
|
|
proc stopActor*(turn: var Turn) =
|
|
assert(not turn.facet.isNil)
|
|
assert(not turn.facet.actor.isNil)
|
|
assert(not turn.facet.actor.root.isNil)
|
|
stop(turn, turn.facet.actor.root)
|
|
|
|
proc freshen*(turn: var Turn, act: TurnAction) {.deprecated.} =
|
|
run(turn.facet, act)
|
|
|
|
proc newCap*(relay: Facet; e: Entity): Cap {.deprecated.} =
|
|
Cap(relay: relay, target: e)
|
|
|
|
proc newCap*(turn; e: Entity): Cap =
|
|
Cap(relay: turn.facet, target: e)
|
|
|
|
proc newCap*(e: Entity; turn): Cap =
|
|
Cap(relay: turn.facet, target: e)
|
|
|
|
type SyncContinuation {.final.} = ref object of Entity
|
|
action: TurnAction
|
|
|
|
method message(entity: SyncContinuation; turn: var Turn; v: AssertionRef) =
|
|
entity.action(turn)
|
|
|
|
proc sync*(turn: var Turn; refer: Cap; act: TurnAction) =
|
|
sync(turn, refer, newCap(turn, SyncContinuation(action: act)))
|
|
|
|
proc running*(actor): bool =
|
|
result = not actor.exited
|
|
if not (result or actor.exitReason.isNil):
|
|
raise actor.exitReason
|
|
|
|
proc run(turn: var Turn) =
|
|
while turn.work.len > 0:
|
|
var (facet, act) = turn.work.popFirst()
|
|
assert not act.isNil
|
|
turn.facet = facet
|
|
act(turn)
|
|
when tracing:
|
|
var act = ActorActivation(orKind: ActorActivationKind.turn)
|
|
act.turn = move turn.desc
|
|
trace(turn.facet.actor, act)
|
|
turn.facet = nil # invalidate the turn
|
|
# TODO: catch exceptions here
|
|
for eff in turn.effects.mitems:
|
|
turnQueue.addLast(move eff)
|
|
|
|
proc run* =
|
|
## Run actors to completion
|
|
var ready: seq[Continuation]
|
|
while true:
|
|
while turnQueue.len > 0:
|
|
var turn = turnQueue.popFirst()
|
|
# TODO: check if actor is still valid
|
|
run turn
|
|
ioqueue.poll(ready)
|
|
if ready.len == 0: break
|
|
while ready.len > 0:
|
|
discard trampoline:
|
|
ready.pop()
|