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leveros

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The Lever OS Node client library

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'use strict'; Object.defineProperty(exports, "__esModule", { value: true }); exports.GRPCPool = undefined; var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }(); var _leverosCommon = require('leveros-common'); var common = _interopRequireWildcard(_leverosCommon); var _grpc = require('grpc'); var _grpc2 = _interopRequireDefault(_grpc); var _lodash = require('lodash'); var _lodash2 = _interopRequireDefault(_lodash); var _sortedMap = require('collections/sorted-map'); var _sortedMap2 = _interopRequireDefault(_sortedMap); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } } function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } var GRPCPool = exports.GRPCPool = function () { function GRPCPool() { _classCallCheck(this, GRPCPool); var expiryMs = 5 * 60 * 1000; // 5 minutes in ms. this._conns = new Cache(expiryMs, this._newConn.bind(this), this._destroyConn.bind(this)); } _createClass(GRPCPool, [{ key: 'dial', value: function dial(target, callback) { this._conns.get(target, callback); } }, { key: 'keepAlive', value: function keepAlive(target) { this._conns.keepAlive(target); } }, { key: '_newConn', value: function _newConn(target, callback) { callback(null, new common.leverRPCProto.core.LeverRPC(target, _grpc2.default.credentials.createInsecure())); } }, { key: '_destroyConn', value: function _destroyConn(conn) { conn.$channel.close(); } }]); return GRPCPool; }(); var CacheEntry = function () { function CacheEntry() { _classCallCheck(this, CacheEntry); this.element = null; this.error = new Error("Not yet constructed"); this.lastUsed = null; this.keepAlive(); } _createClass(CacheEntry, [{ key: 'keepAlive', value: function keepAlive() { this.lastUsed = Date.now(); } }]); return CacheEntry; }(); var Cache = function () { function Cache(expiryMs, constr, destr) { _classCallCheck(this, Cache); this._expiryMs = expiryMs; this._constr = constr; this._destr = destr; this._data = {}; // key -> CacheEntry this._lastUsedMap = new _sortedMap2.default(); // lastUsed (ms) -> array of keys } _createClass(Cache, [{ key: 'get', value: function get(key, callback) { var _this = this; if (this._data.hasOwnProperty(key)) { this.keepAlive(key); var _entry = this._data[key]; setImmediate(callback.bind(null, _entry.error, _entry.element)); return; } var entry = new CacheEntry(); sortedMapInsert(this._lastUsedMap, entry.lastUsed, key); this._data[key] = entry; this._maybeScheduleExpire(entry.lastUsed); this._constr(key, function (error, element) { entry.error = error; entry.element = element; if (error) { // Remove from cache if construction failed. delete _this._data[key]; sortedMapRemove(_this._lastUsedMap, entry.lastUsed, key); } callback(error, element); }); } }, { key: '_destroyEntry', value: function _destroyEntry(entry) { if (entry.element !== null) { try { this._destr(entry.element); } catch (ex) { // Do nothing. } entry.element = null; entry.error = new Error("Was destructed"); } } }, { key: 'keepAlive', value: function keepAlive(key) { if (!this._data.hasOwnProperty(key)) { return false; } var entry = this._data[key]; sortedMapRemove(this._lastUsedMap, entry.lastUsed, key); entry.keepAlive(); sortedMapInsert(this._lastUsedMap, entry.lastUsed, key); this._maybeScheduleExpire(entry.lastUsed); return true; } }, { key: '_maybeScheduleExpire', value: function _maybeScheduleExpire(lastUsed) { if (this._lastUsedMap.store.min()[0] !== lastUsed) { // Already scheduled. return; } var value = this._lastUsedMap.get(lastUsed, []); if (value.length > 1) { // Already scheduled. return; } this._doExpire(); } }, { key: '_doExpire', value: function _doExpire() { var _this2 = this; while (this._lastUsedMap.length !== 0) { var lastUsed = this._lastUsedMap.store.min()[0]; var expiryTime = lastUsed + this._expiryMs; if (expiryTime <= Date.now()) { // Entry expired. var value = this._lastUsedMap.get(lastUsed, []); _lodash2.default.forEach(value, function (key) { var entry = _this2._data[key]; delete _this2._data[key]; _this2._destroyEntry(entry); }); this._lastUsedMap.delete(lastUsed); } else { // Not yet time. 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 // 5 minutes in ms.\n        this._conns = new Cache(\n            expiryMs, this._newConn.bind(this), this._destroyConn.bind(this));\n    }\n\n    dial(target, callback) {\n        this._conns.get(target, callback);\n    }\n\n    keepAlive(target) {\n        this._conns.keepAlive(target);\n    }\n\n    _newConn(target, callback) {\n        callback(\n            null,\n            new common.leverRPCProto.core.LeverRPC(\n                target, grpc.credentials.createInsecure()));\n    }\n\n    _destroyConn(conn) {\n        conn.$channel.close();\n    }\n}\n\nclass CacheEntry {\n    constructor() {\n        this.element = null;\n        this.error = new Error(\"Not yet constructed\");\n        this.lastUsed = null;\n        this.keepAlive();\n    }\n\n    keepAlive() {\n        this.lastUsed = Date.now();\n    }\n}\n\nclass Cache {\n    constructor(expiryMs, constr, destr) {\n        this._expiryMs = expiryMs;\n        this._constr = constr;\n        this._destr = destr;\n        this._data = {};  // key -> CacheEntry\n        this._lastUsedMap = new SortedMap();  // lastUsed (ms) -> array of keys\n    }\n\n    get(key, callback) {\n        if (this._data.hasOwnProperty(key)) {\n            this.keepAlive(key);\n            const entry = this._data[key];\n            setImmediate(callback.bind(null, entry.error, entry.element));\n            return;\n        }\n\n        const entry = new CacheEntry();\n        sortedMapInsert(this._lastUsedMap, entry.lastUsed, key);\n        this._data[key] = entry;\n        this._maybeScheduleExpire(entry.lastUsed);\n\n        this._constr(key, (error, element) => {\n            entry.error = error;\n            entry.element = element;\n\n            if (error) {\n                // Remove from cache if construction failed.\n                delete this._data[key];\n                sortedMapRemove(this._lastUsedMap, entry.lastUsed, key);\n            }\n\n            callback(error, element);\n        });\n    }\n\n    _destroyEntry(entry) {\n        if (entry.element !== null) {\n            try {\n                this._destr(entry.element);\n            } catch (ex) {\n                // Do nothing.\n            }\n            entry.element = null;\n            entry.error = new Error(\"Was destructed\");\n        }\n    }\n\n    keepAlive(key) {\n        if (!this._data.hasOwnProperty(key)) {\n            return false;\n        }\n        const entry = this._data[key];\n        sortedMapRemove(this._lastUsedMap, entry.lastUsed, key);\n        entry.keepAlive();\n        sortedMapInsert(this._lastUsedMap, entry.lastUsed, key);\n        this._maybeScheduleExpire(entry.lastUsed);\n        return true;\n    }\n\n    _maybeScheduleExpire(lastUsed) {\n        if (this._lastUsedMap.store.min()[0] !== lastUsed) {\n            // Already scheduled.\n            return;\n        }\n        const value = this._lastUsedMap.get(lastUsed, []);\n        if (value.length > 1) {\n            // Already scheduled.\n            return;\n        }\n        this._doExpire();\n    }\n\n    _doExpire() {\n        while (this._lastUsedMap.length !== 0) {\n            const lastUsed = this._lastUsedMap.store.min()[0];\n            const expiryTime = lastUsed + this._expiryMs;\n            if (expiryTime <= Date.now()) {\n                // Entry expired.\n                const value = this._lastUsedMap.get(lastUsed, []);\n                lodash.forEach(value, (key) => {\n                    const entry = this._data[key];\n                    delete this._data[key];\n                    this._destroyEntry(entry);\n                });\n                this._lastUsedMap.delete(lastUsed);\n            } else {\n                // Not yet time. Schedule next.\n                const untilExpiry = expiryTime - Date.now();\n                setTimeout(this._doExpire.bind(this), untilExpiry);\n                return;\n            }\n        }\n    }\n}\n\nfunction sortedMapInsert(map, key, target) {\n    if (!map.has(key)) {\n        map.set(key, [target]);\n        return;\n    }\n    const value = map.get(key);\n    value.push(target);\n    map.set(key, value);\n}\n\nfunction sortedMapRemove(map, key, target) {\n    if (!map.has(key)) {\n        return;\n    }\n    const value = map.get(key);\n    const foundIndex = lodash.indexOf(value, target);\n    if (foundIndex === -1) {\n        return;\n    }\n    value.splice(foundIndex, 1);\n    if (value.length === 0) {\n        map.delete(key);\n    } else {\n        map.set(key, value);\n    }\n}\n"]}