536 lines
18 KiB
Nim
536 lines
18 KiB
Nim
# SPDX-FileCopyrightText: ☭ Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[asyncdispatch, options, tables]
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from std/os import getEnv, `/`
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import preserves
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import ../syndicate, /capabilities, ./durings, ./membranes, ./protocols/[gatekeeper, protocol, sturdy, transportAddress]
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when defined(traceSyndicate):
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when defined(posix):
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template trace(args: varargs[untyped]): untyped = stderr.writeLine(args)
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else:
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template trace(args: varargs[untyped]): untyped = echo(args)
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else:
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template trace(args: varargs[untyped]): untyped = discard
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export `$`
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type
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Oid = sturdy.Oid
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export Stdio, Tcp, WebSocket, Unix
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type
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Assertion = Value
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WireRef = sturdy.WireRef
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Turn = syndicate.Turn
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Handle = actors.Handle
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PacketWriter = proc (turn: var Turn; buf: seq[byte]) {.closure.}
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RelaySetup = proc (turn: var Turn; relay: Relay) {.closure.}
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Relay* = ref object
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facet: Facet
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inboundAssertions: Table[Handle,
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tuple[localHandle: Handle, imported: seq[WireSymbol]]]
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outboundAssertions: Table[Handle, seq[WireSymbol]]
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exported: Membrane
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imported: Membrane
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nextLocalOid: Oid
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pendingTurn: protocol.Turn
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wireBuf: BufferedDecoder
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packetWriter: PacketWriter
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peer: Cap
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SyncPeerEntity = ref object of Entity
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relay: Relay
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peer: Cap
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handleMap: Table[Handle, Handle]
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e: WireSymbol
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RelayEntity = ref object of Entity
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## https://synit.org/book/protocol.html#relay-entities
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label: string
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relay: Relay
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proc releaseCapOut(r: Relay; e: WireSymbol) =
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r.exported.drop e
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method publish(spe: SyncPeerEntity; t: var Turn; a: AssertionRef; h: Handle) =
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spe.handleMap[h] = publish(t, spe.peer, a.value)
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method retract(se: SyncPeerEntity; t: var Turn; h: Handle) =
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var other: Handle
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if se.handleMap.pop(h, other):
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retract(t, other)
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method message(se: SyncPeerEntity; t: var Turn; a: AssertionRef) =
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if not se.e.isNil:
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se.relay.releaseCapOut(se.e)
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message(t, se.peer, a.value)
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method sync(se: SyncPeerEntity; t: var Turn; peer: Cap) =
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sync(t, se.peer, peer)
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proc newSyncPeerEntity(r: Relay; p: Cap): SyncPeerEntity =
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SyncPeerEntity(relay: r, peer: p)
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proc rewriteCapOut(relay: Relay; cap: Cap; exported: var seq[WireSymbol]): WireRef =
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if cap.target of RelayEntity and cap.target.RelayEntity.relay == relay and cap.attenuation.len == 0:
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result = WireRef(orKind: WireRefKind.yours, yours: WireRefYours(oid: cap.target.oid))
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else:
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var ws = grab(relay.exported, cap)
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if ws.isNil:
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ws = newWireSymbol(relay.exported, relay.nextLocalOid, cap)
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inc relay.nextLocalOid
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exported.add ws
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result = WireRef(
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orKind: WireRefKind.mine,
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mine: WireRefMine(oid: ws.oid))
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proc rewriteOut(relay: Relay; v: Assertion):
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tuple[rewritten: Value, exported: seq[WireSymbol]] {.closure.} =
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var exported: seq[WireSymbol]
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result.rewritten = mapEmbeds(v) do (pr: Value) -> Value:
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let o = pr.unembed(Cap); if o.isSome:
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rewriteCapOut(relay, o.get, exported).toPreserves
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else: pr
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result.exported = exported
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proc register(relay: Relay; v: Assertion; h: Handle): tuple[rewritten: Value, exported: seq[WireSymbol]] =
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result = rewriteOut(relay, v)
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relay.outboundAssertions[h] = result.exported
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proc deregister(relay: Relay; h: Handle) =
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var outbound: seq[WireSymbol]
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if relay.outboundAssertions.pop(h, outbound):
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for e in outbound: releaseCapOut(relay, e)
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proc send(relay: Relay; turn: var Turn; rOid: protocol.Oid; m: Event) =
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if relay.pendingTurn.len == 0:
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# If the pending queue is empty then schedule a packet
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# to be sent after pending I/O is processed.
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callSoon do ():
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relay.facet.run do (turn: var Turn):
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var pkt = Packet(
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orKind: PacketKind.Turn,
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turn: move relay.pendingTurn)
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trace "C: ", pkt
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relay.packetWriter(turn, encode pkt)
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relay.pendingTurn.add TurnEvent(oid: rOid, event: m)
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proc send(re: RelayEntity; turn: var Turn; ev: Event) =
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send(re.relay, turn, protocol.Oid re.oid, ev)
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method publish(re: RelayEntity; t: var Turn; a: AssertionRef; h: Handle) =
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re.send(t, Event(
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orKind: EventKind.Assert,
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`assert`: protocol.Assert(
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assertion: re.relay.register(a.value, h).rewritten,
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handle: h)))
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method retract(re: RelayEntity; t: var Turn; h: Handle) =
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re.relay.deregister h
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re.send(t, Event(
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orKind: EventKind.Retract,
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retract: Retract(handle: h)))
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method message(re: RelayEntity; turn: var Turn; msg: AssertionRef) =
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var (value, exported) = rewriteOut(re.relay, msg.value)
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assert(len(exported) == 0, "cannot send a reference in a message")
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if len(exported) == 0:
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re.send(turn, Event(orKind: EventKind.Message, message: Message(body: value)))
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method sync(re: RelayEntity; turn: var Turn; peer: Cap) =
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var
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peerEntity = newSyncPeerEntity(re.relay, peer)
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exported: seq[WireSymbol]
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wr = rewriteCapOut(re.relay, turn.newCap(peerEntity), exported)
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peerEntity.e = exported[0]
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var ev = Event(orKind: EventKind.Sync)
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ev.sync.peer = wr.toPreserves.embed
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re.send(turn, ev)
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proc newRelayEntity(label: string; r: Relay; o: Oid): RelayEntity =
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RelayEntity(label: label, relay: r, oid: o)
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using
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relay: Relay
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facet: Facet
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proc lookupLocal(relay; oid: Oid): Cap =
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let sym = relay.exported.grab oid
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if sym.isNil: newInertCap()
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else: sym.cap
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proc isInert(r: Cap): bool =
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r.target.isNil
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proc rewriteCapIn(relay; facet; n: WireRef, imported: var seq[WireSymbol]): Cap =
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case n.orKind
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of WireRefKind.mine:
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var e = relay.imported.grab(n.mine.oid)
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if e.isNil:
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e = newWireSymbol(
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relay.imported,
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n.mine.oid,
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newCap(facet, newRelayEntity("rewriteCapIn", relay, n.mine.oid)),
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)
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imported.add e
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result = e.cap
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of WireRefKind.yours:
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let r = relay.lookupLocal(n.yours.oid)
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if n.yours.attenuation.len == 0 or r.isInert: result = r
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else: raiseAssert "attenuation not implemented"
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proc rewriteIn(relay; facet; v: Value):
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tuple[rewritten: Assertion; imported: seq[WireSymbol]] =
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var imported: seq[WireSymbol]
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result.rewritten = mapEmbeds(v) do (pr: Value) -> Value:
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let wr = pr.preservesTo WireRef; if wr.isSome:
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result = rewriteCapIn(relay, facet, wr.get, imported).embed
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else:
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result = pr
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result.imported = imported
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proc close(r: Relay) = discard
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proc dispatch(relay: Relay; turn: var Turn; cap: Cap; event: Event) =
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case event.orKind
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of EventKind.Assert:
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let (a, imported) = rewriteIn(relay, turn.facet, event.assert.assertion)
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relay.inboundAssertions[event.assert.handle] = (publish(turn, cap, a), imported,)
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of EventKind.Retract:
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let remoteHandle = event.retract.handle
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var outbound: tuple[localHandle: Handle, imported: seq[WireSymbol]]
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if relay.inboundAssertions.pop(remoteHandle, outbound):
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for e in outbound.imported: relay.imported.drop e
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turn.retract(outbound.localHandle)
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of EventKind.Message:
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let (a, imported) = rewriteIn(relay, turn.facet, event.message.body)
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assert imported.len == 0, "Cannot receive transient reference"
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turn.message(cap, a)
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of EventKind.Sync:
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discard # TODO
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#[
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var imported: seq[WireSymbol]
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let k = relay.rewriteCapIn(turn, evenr.sync.peer, imported)
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turn.sync(cap) do (turn: var Turn):
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turn.message(k, true)
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for e in imported: relay.imported.del e
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]#
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proc dispatch(relay: Relay; v: Value) =
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trace "S: ", v
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run(relay.facet) do (t: var Turn):
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var pkt: Packet
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if pkt.fromPreserves(v):
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case pkt.orKind
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of PacketKind.Turn:
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# https://synit.org/book/protocol.html#turn-packets
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for te in pkt.turn:
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let r = lookupLocal(relay, te.oid.Oid)
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if not r.isInert:
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dispatch(relay, t, r, te.event)
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else:
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stderr.writeLine("discarding event for unknown Cap; ", te.event)
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of PacketKind.Error:
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# https://synit.org/book/protocol.html#error-packets
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when defined(posix):
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stderr.writeLine("Error from server: ", pkt.error.message, " (detail: ", pkt.error.detail, ")")
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close relay
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of PacketKind.Extension:
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# https://synit.org/book/protocol.html#extension-packets
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discard
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else:
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when defined(posix):
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stderr.writeLine("discarding undecoded packet ", v)
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proc recv(relay: Relay; buf: seq[byte]) =
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feed(relay.wireBuf, buf)
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var pr = decode(relay.wireBuf)
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if pr.isSome: dispatch(relay, pr.get)
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type
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RelayOptions* = object of RootObj
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packetWriter*: PacketWriter
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RelayActorOptions* = object of RelayOptions
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initialOid*: Option[Oid]
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initialCap*: Cap
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nextLocalOid*: Option[Oid]
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proc spawnRelay(name: string; turn: var Turn; opts: RelayActorOptions; setup: RelaySetup) =
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spawn(name, turn) do (turn: var Turn):
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let relay = Relay(
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facet: turn.facet,
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packetWriter: opts.packetWriter,
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wireBuf: newBufferedDecoder(0),
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)
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discard relay.facet.preventInertCheck()
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if not opts.initialCap.isNil:
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var exported: seq[WireSymbol]
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discard rewriteCapOut(relay, opts.initialCap, exported)
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opts.nextLocalOid.map do (oid: Oid):
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relay.nextLocalOid =
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if oid == 0.Oid: 1.Oid
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else: oid
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assert opts.initialOid.isSome
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if opts.initialOid.isSome:
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var
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imported: seq[WireSymbol]
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wr = WireRef(
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orKind: WireRefKind.mine,
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mine: WireRefMine(oid: opts.initialOid.get))
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relay.peer = rewriteCapIn(relay, turn.facet, wr, imported)
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assert not relay.peer.isNil
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setup(turn, relay)
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proc rejected(detail: Value): Resolved =
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result = Resolved(orKind: ResolvedKind.Rejected)
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result.rejected.detail = detail
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proc accepted(cap: Cap): Resolved =
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result = Resolved(orKind: ResolvedKind.accepted)
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result.accepted.responderSession = cap
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when defined(posix):
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import std/asyncfile
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export Unix
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type StdioControlEntity = ref object of Entity
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stdin: AsyncFile
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method message(entity: StdioControlEntity; turn: var Turn; ass: AssertionRef) =
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if ass.value.preservesTo(ForceDisconnect).isSome:
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close(entity.stdin)
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close(stdout)
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proc connectTransport(turn: var Turn; ds: Cap; ta: transportAddress.Stdio) =
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## Connect to an external dataspace over stdio.
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proc stdoutWriter(turn: var Turn; buf: seq[byte]) =
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## Blocking write to stdout.
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let n = writeBytes(stdout, buf, 0, buf.len)
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flushFile(stdout)
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if n != buf.len:
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stopActor(turn)
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var opts = RelayActorOptions(
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packetWriter: stdoutWriter,
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initialCap: ds,
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initialOid: 0.Oid.some,
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)
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spawnRelay("stdio", turn, opts) do (turn: var Turn; relay: Relay):
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let
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facet = turn.facet
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asyncStdin = openAsync("/dev/stdin") # this is universal now?
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publish(turn, ds, TransportConnection(
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`addr`: ta.toPreserves,
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control: StdioControlEntity(stdin: asyncStdin).newCap(turn),
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resolved: relay.peer.accepted,
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))
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const stdinReadSize = 0x2000
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proc readCb(pktFut: Future[string]) =
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if not pktFut.failed:
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var buf = pktFut.read
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if buf.len == 0:
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run(facet) do (turn: var Turn): stopActor(turn)
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else:
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relay.recv(cast[seq[byte]](buf))
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asyncStdin.read(stdinReadSize).addCallback(readCb)
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asyncStdin.read(stdinReadSize).addCallback(readCb)
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proc connectStdio*(turn: var Turn; ds: Cap) =
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## Connect to an external dataspace over stdin and stdout.
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connectTransport(turn, ds, transportAddress.Stdio())
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import std/asyncnet
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from std/nativesockets import AF_INET, AF_UNIX, IPPROTO_TCP, SOCK_STREAM, Protocol
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type SocketControlEntity = ref object of Entity
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socket: AsyncSocket
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method message(entity: SocketControlEntity; turn: var Turn; ass: AssertionRef) =
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if ass.value.preservesTo(ForceDisconnect).isSome:
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close(entity.socket)
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type ShutdownEntity* = ref object of Entity
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method retract(e: ShutdownEntity; turn: var Turn; h: Handle) =
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stopActor(turn)
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proc connect(turn: var Turn; ds: Cap; transAddr: Value; socket: AsyncSocket) =
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proc socketWriter(turn: var Turn; buf: seq[byte]) =
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asyncCheck(turn, socket.send(cast[string](buf)))
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var ops = RelayActorOptions(
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packetWriter: socketWriter,
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initialOid: 0.Oid.some,
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)
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spawnRelay("socket", turn, ops) do (turn: var Turn; relay: Relay):
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let facet = turn.facet
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facet.actor.atExit do (turn: var Turn): close(socket)
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publish(turn, ds, TransportConnection(
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`addr`: transAddr,
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control: SocketControlEntity(socket: socket).newCap(turn),
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resolved: relay.peer.accepted,
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))
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const recvSize = 0x4000
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proc recvCb(pktFut: Future[string]) =
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if pktFut.failed or pktFut.read.len == 0:
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run(facet) do (turn: var Turn): stopActor(turn)
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else:
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relay.recv(cast[seq[byte]](pktFut.read))
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if not socket.isClosed:
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socket.recv(recvSize).addCallback(recvCb)
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socket.recv(recvSize).addCallback(recvCb)
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proc connect(turn: var Turn; ds: Cap; ta: Value; socket: AsyncSocket; fut: Future[void]) =
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let facet = turn.facet
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fut.addCallback do ():
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run(facet) do (turn: var Turn):
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if fut.failed:
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var ass = TransportConnection(
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`addr`: ta,
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resolved: Resolved(orKind: ResolvedKind.Rejected),
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)
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ass.resolved.rejected.detail = embed fut.error
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publish(turn, ds, ass)
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else:
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connect(turn, ds, ta, socket)
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proc connectTransport(turn: var Turn; ds: Cap; ta: transportAddress.Tcp) =
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let
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facet = turn.facet
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socket = newAsyncSocket(
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domain = AF_INET,
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sockType = SOCK_STREAM,
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protocol = IPPROTO_TCP,
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buffered = false,
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)
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connect(turn, ds, ta.toPreserves, socket, connect(socket, ta.host, Port ta.port))
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proc connectTransport(turn: var Turn; ds: Cap; ta: transportAddress.Unix) =
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## Relay a dataspace over a UNIX socket.
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let socket = newAsyncSocket(
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domain = AF_UNIX,
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sockType = SOCK_STREAM,
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protocol = cast[Protocol](0),
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buffered = false)
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connect(turn, ds, ta.toPreserves, socket, connectUnix(socket, ta.path))
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proc walk(turn: var Turn; ds, origin: Cap; route: Route; transOff, stepOff: int) =
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if stepOff < route.pathSteps.len:
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let
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step = route.pathSteps[stepOff]
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rejectPat = ResolvedPathStep?:{
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0: ?(origin.embed), 1: ?step, 2: ?:Rejected}
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acceptPat = ResolvedPathStep?:{
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0: ?(origin.embed), 1: ?step, 2: ?:ResolvedAccepted}
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onPublish(turn, ds, rejectPat) do (detail: Value):
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publish(turn, ds, ResolvePath(
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route: route,
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`addr`: route.transports[transOff],
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resolved: detail.rejected,
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))
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during(turn, ds, acceptPat) do (next: Cap):
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walk(turn, ds, next, route, transOff, stepOff.succ)
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else:
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publish(turn, ds, ResolvePath(
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route: route,
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`addr`: route.transports[transOff],
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resolved: origin.accepted,
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))
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proc connectRoute(turn: var Turn; ds: Cap; route: Route; transOff: int) =
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let rejectPat = TransportConnection ?: {
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0: ?route.transports[transOff],
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2: ?:Rejected,
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}
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during(turn, ds, rejectPat) do (detail: Value):
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publish(turn, ds, ResolvePath(
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route: route,
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`addr`: route.transports[transOff],
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resolved: detail.rejected,
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))
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let acceptPat = TransportConnection?:{
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0: ?route.transports[transOff],
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2: ?:ResolvedAccepted,
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}
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onPublish(turn, ds, acceptPat) do (origin: Cap):
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walk(turn, ds, origin, route, transOff, 0)
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type StepCallback = proc (turn: var Turn; step: Value; origin, next: Cap) {.closure.}
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proc spawnStepResolver(turn: var Turn; ds: Cap; stepType: Value; cb: StepCallback) =
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spawn($stepType & "-step", turn) do (turn: var Turn):
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let stepPat = grabRecord(stepType, grab())
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let pat = ?Observe(pattern: ResolvedPathStep?:{1: stepPat}) ?? {0: grabLit(), 1: grab()}
|
|
during(turn, ds, pat) do (origin: Cap; stepDetail: Literal[Value]):
|
|
let step = toRecord(stepType, stepDetail.value)
|
|
proc duringCallback(turn: var Turn; ass: Value; h: Handle): TurnAction =
|
|
var res = ass.preservesTo Resolved
|
|
if res.isSome:
|
|
if res.get.orKind == ResolvedKind.accepted and
|
|
res.get.accepted.responderSession of Cap:
|
|
cb(turn, step, origin, res.get.accepted.responderSession.Cap)
|
|
else:
|
|
publish(turn, ds, ResolvedPathStep(
|
|
origin: origin, pathStep: step, resolved: res.get))
|
|
proc action(turn: var Turn) =
|
|
stop(turn)
|
|
result = action
|
|
publish(turn, origin, Resolve(
|
|
step: step, observer: newCap(turn, during(duringCallback))))
|
|
|
|
proc spawnRelays*(turn: var Turn; ds: Cap) =
|
|
## Spawn actors that manage routes and appeasing gatekeepers.
|
|
spawn("transport-connector", turn) do (turn: var Turn):
|
|
let pat = ?Observe(pattern: !TransportConnection) ?? { 0: grab() }
|
|
# Use a generic pattern and type matching
|
|
# in the during handler because it is easy.
|
|
|
|
let stdioPat = ?Observe(pattern: TransportConnection?:{0: ?:Stdio})
|
|
during(turn, ds, stdioPat) do:
|
|
connectTransport(turn, ds, Stdio())
|
|
|
|
# TODO: tcp pattern
|
|
during(turn, ds, pat) do (ta: Literal[transportAddress.Tcp]):
|
|
connectTransport(turn, ds, ta.value)
|
|
|
|
# TODO: unix pattern
|
|
during(turn, ds, pat) do (ta: Literal[transportAddress.Unix]):
|
|
connectTransport(turn, ds, ta.value)
|
|
|
|
spawn("path-resolver", turn) do (turn: var Turn):
|
|
let pat = ?Observe(pattern: !ResolvePath) ?? {0: grab()}
|
|
during(turn, ds, pat) do (route: Literal[Route]):
|
|
for i, transAddr in route.value.transports:
|
|
connectRoute(turn, ds, route.value, i)
|
|
|
|
spawnStepResolver(turn, ds, "ref".toSymbol) do (
|
|
turn: var Turn, step: Value, origin: Cap, next: Cap):
|
|
publish(turn, ds, ResolvedPathStep(
|
|
origin: origin, pathStep: step, resolved: next.accepted))
|
|
|
|
type BootProc* = proc (turn: var Turn; ds: Cap) {.closure.}
|
|
|
|
proc envRoute*: Route =
|
|
var text = getEnv("SYNDICATE_ROUTE")
|
|
if text == "":
|
|
var tx = (getEnv("XDG_RUNTIME_DIR", "/run/user/1000") / "dataspace").toPreserves
|
|
result.transports = @[initRecord("unix", tx)]
|
|
result.pathSteps = @[capabilities.mint().toPreserves]
|
|
else:
|
|
var pr = parsePreserves(text)
|
|
if not result.fromPreserves(pr):
|
|
raise newException(ValueError, "failed to parse $SYNDICATE_ROUTE " & $pr)
|
|
|
|
proc resolve*(turn: var Turn; ds: Cap; route: Route; bootProc: BootProc) =
|
|
during(turn, ds, ResolvePath ?: {0: ?route, 3: ?:ResolvedAccepted}) do (dst: Cap):
|
|
bootProc(turn, dst)
|
|
|
|
# TODO: define a runActor that comes preloaded with relaying
|