123 lines
4.6 KiB
JavaScript
123 lines
4.6 KiB
JavaScript
"use strict";
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//---------------------------------------------------------------------------
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// @syndicate-lang/core, an implementation of Syndicate dataspaces for JS.
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// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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const $Special = require('./special.js');
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const _Dataspace = require('./dataspace.js');
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const Dataspace = _Dataspace.Dataspace;
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const Assertions = require('./assertions.js');
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const Observe = Assertions.Observe;
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const Inbound = Assertions.Inbound;
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const Outbound = Assertions.Outbound;
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const $QuitDataspace = new $Special("quit-dataspace");
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// TODO: container --> metaContainer == ground
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// TODO: parent links
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// so there's a path up the tree at all times, and also an easy way to get to ground
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function NestedDataspace(outerFacet, container, bootProc) {
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Dataspace.call(this, container, bootProc);
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this.outerFacet = outerFacet;
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}
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NestedDataspace.prototype = new Dataspace(null, null);
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NestedDataspace.prototype.sendMessage = function (m) {
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Dataspace.prototype.sendMessage.call(this, m);
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if (m === $QuitDataspace) {
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this.outerFacet.stop();
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}
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};
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NestedDataspace.prototype.endpointHook = function (facet, ep) {
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Dataspace.prototype.endpointHook.call(this, facet, ep);
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if (Observe.isClassOf(ep.assertion) && Inbound.isClassOf(ep.assertion[0])) {
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this.installInboundRelay(facet, ep);
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} else if (Outbound.isClassOf(ep.assertion)) {
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this.installOutboundRelay(facet, ep);
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}
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};
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NestedDataspace.prototype.installInboundRelay = function (facet, innerEp) {
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// We know that innerEp.assertion is an Observe(Inbound(...)).
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// Also, if innerEp.handler exists, it will be consonant with innerEp.assertion.
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this.hookEndpointLifecycle(innerEp, this.outerFacet.addEndpoint(() => {
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return [Observe(innerEp.assertion[0][0]),
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innerEp.handler && {
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skeleton: innerEp.handler.skeleton[1],
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constPaths: innerEp.handler.constPaths.map((p) => p.shift()),
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constVals: innerEp.handler.constVals,
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capturePaths: innerEp.handler.capturePaths.map((p) => p.shift()),
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callback: innerEp.handler.callback
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}];
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}, false));
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};
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NestedDataspace.prototype.installOutboundRelay = function (facet, innerEp) {
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// We know that innerEp.assertion is an Outbound(...).
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// We may also then conclude that there is no point in installing a handler.
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this.hookEndpointLifecycle(innerEp, this.outerFacet.addEndpoint(() => {
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return [innerEp.assertion[0], null];
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}, false));
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};
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NestedDataspace.prototype.hookEndpointLifecycle = function (innerEp, outerEp) {
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const outerFacet = this.outerFacet;
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const _refresh = innerEp.refresh;
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innerEp.refresh = function (ds, ac, facet) {
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_refresh.call(this, ds, ac, facet);
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outerEp.refresh(outerFacet.actor.dataspace, outerFacet.actor, outerFacet);
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};
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const _destroy = innerEp.destroy;
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innerEp.destroy = function (ds, ac, facet, emitPatches) {
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_destroy.call(this, ds, ac, facet, emitPatches);
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outerEp.destroy(outerFacet.actor.dataspace, outerFacet.actor, outerFacet, true);
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};
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};
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NestedDataspace.prototype.start = function () {
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this.outerFacet.actor.pushScript(() => {
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Dataspace.withCurrentFacet(this.outerFacet, () => {
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if (this.outerFacet.isLive) {
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Dataspace.deferTurn(() => {
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const stillBusy = this.runScripts();
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if (stillBusy) this.start();
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});
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}
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});
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});
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};
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function inNestedDataspace(bootProc) {
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return () => {
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const outerFacet = Dataspace.currentFacet();
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outerFacet.addDataflow(function () {});
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// ^ eww! Dummy endpoint to keep the root facet of the relay alive.
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const innerDs = new NestedDataspace(outerFacet, outerFacet.actor.dataspace.container, bootProc);
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outerFacet.actor.scheduleScript(() => innerDs.start());
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};
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}
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module.exports.$QuitDataspace = $QuitDataspace;
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module.exports.NestedDataspace = NestedDataspace;
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module.exports.inNestedDataspace = inNestedDataspace;
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