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PrefixMap from './prefix-map'\nimport { IncomingRoute } from '../types/routing'\nimport { create as createLogger, ConnectorLogger } from '../common/log'\nimport { Type, deserializeIlpReject } from 'ilp-packet'\nimport {\n CcpRouteControlRequest,\n CcpRouteUpdateRequest,\n Mode,\n serializeCcpRouteControlRequest\n} from 'ilp-protocol-ccp'\nimport { PluginInstance } from '../types/plugin'\n\nexport interface CcpReceiverOpts {\n plugin: PluginInstance\n accountId: string\n}\n\nconst ROUTE_CONTROL_RETRY_INTERVAL = 30000\n\nexport default class CcpReceiver {\n private plugin: PluginInstance\n private log: ConnectorLogger\n private accountId: string\n private routes: PrefixMap<IncomingRoute>\n private expiry: number = 0\n\n /**\n * Current routing table id used by our peer.\n *\n * We'll reset our epoch if this changes.\n */\n private routingTableId: string = '00000000-0000-0000-0000-000000000000'\n /**\n * Epoch index up to which our peer has sent updates\n */\n private epoch: number = 0\n\n constructor ({ plugin, accountId }: CcpReceiverOpts) {\n this.plugin = plugin\n this.log = createLogger(`ccp-receiver[${accountId}]`)\n this.accountId = accountId\n this.routes = new PrefixMap()\n }\n\n bump (holdDownTime: number) {\n this.expiry = Math.max(Date.now() + holdDownTime, this.expiry)\n }\n\n getAccountId () {\n return this.accountId\n }\n\n getExpiry () {\n return this.expiry\n }\n\n getPrefixes () {\n return this.routes.keys()\n }\n\n getRoutingTableId () {\n return this.routingTableId\n }\n\n getEpoch () {\n return this.epoch\n }\n\n getStatus () {\n return {\n routingTableId: this.routingTableId,\n epoch: this.epoch\n }\n }\n\n handleRouteUpdate ({\n speaker,\n routingTableId,\n fromEpochIndex,\n toEpochIndex,\n holdDownTime,\n newRoutes,\n withdrawnRoutes\n }: CcpRouteUpdateRequest): string[] {\n this.bump(holdDownTime)\n\n if (this.routingTableId !== routingTableId) {\n this.log.trace('saw new routing table. oldId=%s newId=%s', this.routingTableId, routingTableId)\n this.routingTableId = routingTableId\n this.epoch = 0\n }\n\n if (fromEpochIndex > this.epoch) {\n // There is a gap, we need to go back to the last epoch we have\n this.log.trace('gap in routing updates. expectedEpoch=%s actualFromEpoch=%s', this.epoch, fromEpochIndex)\n return []\n }\n if (this.epoch > toEpochIndex) {\n // This routing update is older than what we already have\n this.log.trace('old routing update, ignoring. expectedEpoch=%s actualToEpoch=%s', this.epoch, toEpochIndex)\n return []\n }\n\n // just a heartbeat\n if (newRoutes.length === 0 && withdrawnRoutes.length === 0) {\n this.log.trace('pure heartbeat. fromEpoch=%s toEpoch=%s', fromEpochIndex, toEpochIndex)\n this.epoch = toEpochIndex\n return []\n }\n\n const changedPrefixes: string[] = []\n if (withdrawnRoutes.length > 0) {\n this.log.trace('informed of no longer reachable routes. count=%s routes=%s', withdrawnRoutes.length, withdrawnRoutes)\n for (const prefix of withdrawnRoutes) {\n if (this.deleteRoute(prefix)) {\n changedPrefixes.push(prefix)\n }\n }\n }\n\n for (const route of newRoutes) {\n if (this.addRoute({\n peer: this.accountId,\n prefix: route.prefix,\n path: route.path,\n auth: route.auth\n })) {\n changedPrefixes.push(route.prefix)\n }\n }\n\n this.epoch = toEpochIndex\n\n this.log.trace('applied route update. changedPrefixesCount=%s fromEpoch=%s toEpoch=%s', changedPrefixes.length, fromEpochIndex, toEpochIndex)\n\n return changedPrefixes\n }\n\n getPrefix (prefix: string) {\n return this.routes.get(prefix)\n }\n\n sendRouteControl = () => {\n if (!this.plugin.isConnected()) {\n this.log.debug('cannot send route control message, plugin not connected (yet).')\n return\n }\n\n const routeControl: CcpRouteControlRequest = {\n mode: Mode.MODE_SYNC,\n lastKnownRoutingTableId: this.routingTableId,\n lastKnownEpoch: this.epoch,\n features: []\n }\n\n this.plugin.sendData(serializeCcpRouteControlRequest(routeControl))\n .then(data => {\n if (data[0] === Type.TYPE_ILP_FULFILL) {\n this.log.trace('successfully sent route control message.')\n } else if (data[0] === Type.TYPE_ILP_REJECT) {\n this.log.debug('route control message was rejected. rejection=%j', deserializeIlpReject(data))\n throw new Error('route control message rejected.')\n } else {\n this.log.debug('unknown response packet type. type=' + data[0])\n throw new Error('route control message returned unknown response.')\n }\n })\n .catch((err: any) => {\n const errInfo = (err instanceof Object && err.stack) ? err.stack : err\n this.log.debug('failed to set route control information on peer. error=%s', errInfo)\n // TODO: Should have more elegant, thought-through retry logic here\n const retryTimeout = setTimeout(this.sendRouteControl, ROUTE_CONTROL_RETRY_INTERVAL)\n\n retryTimeout.unref()\n })\n }\n\n private addRoute (route: IncomingRoute) {\n this.routes.insert(route.prefix, route)\n\n // TODO Check if actually changed\n return true\n }\n\n private deleteRoute (prefix: string) {\n this.routes.delete(prefix)\n\n // TODO Check if actually changed\n return true\n }\n}\n"]} |