[ { "__docId__": 0, "kind": "file", "name": "src/RethinkAdapter.js", "content": "// deps\nimport * as nrser from 'nrser';\nconst Promise = nrser.Promise;\nconst _ = nrser._;\nimport { Record, Adapter } from '@nrser/supermodel';\n\n// package\nimport * as util from './util';\n\n// types\nimport t from '@nrser/supermodel/lib/types';\n\nimport type {\n Integer,\n PositiveInteger,\n} from 'nrser/lib/types/number';\n\nimport type {\n Id,\n Document\n} from '@nrser/supermodel/lib/types';\n\nimport type {\n IRethinkDb,\n IConnection,\n ITable,\n} from './types';\n\n/**\n* Supermodel Adapter for RethinkDB.\n*/\nexport class RethinkAdapter extends Adapter {\n /**\n * @param {rethinkdb} [rethinkdb]\n * the module returned from require('rethinkdb').\n * \n * we need to pass it in so that we don't end up using a different \n * instantiation than the one that created the connection.\n * \n * @param {rethinkdb.Net.Connection} [conn]\n * connection to the rethink database.\n */\n constructor(rethinkdb, conn) {\n super();\n this.r = rethinkdb;\n this.conn = conn;\n } // constructor\n \n \n // rethink-specific utils\n // ========================================================================\n // \n \n \n /**\n * get the table name for a Record class; uses the tcomb type name.\n */\n tableName(recordClass: Class): string {\n return recordClass.meta.name;\n }\n \n \n /**\n * get the rethink table for a Record class.\n */\n table(recordClass: Class): RethinkTable {\n return this.r.table(this.tableName(recordClass));\n }\n \n \n /**\n * handle write (insert, replace) response from RethinkDB, which has an \n * `errors` field with the number of write errors.\n * \n * convert it into a Promise rejection if present.\n */\n handleWriteResponse(response): Promise {\n if (response.errors > 0) {\n return Promise.reject(new Error(response.first_error));\n }\n \n return Promise.resolve();\n } // .handleWriteResponse\n \n \n /**\n * ensure the DB is setup for the record classes.\n * \n * includes:\n * \n * 1. ensure the database exists.\n * 2. for each Record class:\n * 1. ensure the table exists.\n * 2. ensure the indexes exist.\n */\n ensureDBSetup(recordClasses: Array>): Promise {\n return (\n util.ensureDB(this.r, this.conn, this.conn.db)\n .then(() => this.ensureTables(recordClasses))\n .then(() => this.ensureIndexes(recordClasses))\n .then(() => undefined) // return undefined\n ); // return\n } // #ensureDBSetup\n \n \n /**\n * ensure tables for the Record classes have been created.\n * \n * returns a Promise of an object with table names mapped to whether the\n * table had to be created or not.\n */\n ensureTables(\n recordClasses: Array>,\n ): Promise<{[tableName: string]: boolean}> { \n return (\n Promise.props(\n _.chain(recordClasses)\n .map((recordClass) => {\n const tableName = this.tableName(recordClass);\n \n debug: `ensuring table ${ tableName }...`;\n \n return [\n tableName,\n util.ensureTable(this.r, this.conn, tableName),\n ];\n })\n .fromPairs()\n .value()\n ) // Promise.props\n ); // return\n } // ensureTable\n \n \n /**\n * ensure all the indexes declared in the Record class exist, creating if\n * necessary. if `wait` is true, uses `rethinkdb.indexWait` to wait for the\n * index to be ready.\n * \n * returns a `Promise` that resolves when all done, or rejects on error.\n */\n ensureIndexes(\n recordClasses: Class | Array>,\n {\n wait = true,\n } : {\n wait: boolean,\n } = {}\n ): Promise<\n {[recordName: string]: {[indexName: string]: boolean}} |\n {[indexName: string]: boolean}\n > {\n debug: \"ensuring indexes...\";\n \n // if we were passed and array of Record classes, return a promise that\n // maps their meta names to the results of ensuring the indexes on\n // each one.\n if (Array.isArray(recordClasses)) {\n return (\n Promise.props(\n _.chain(recordClasses)\n .map((recordClass) => {\n return [\n recordClass.meta.name,\n this.ensureIndexes(recordClass, {wait})\n ];\n })\n .fromPairs()\n .value() // end chain\n ) // Promise.props\n ); // return\n } // if isArray\n \n // now it should be a single record class\n const recordClass: Class = recordClasses;\n const tableName: string = this.tableName(recordClass);\n \n debug: `ensuring indexes for ${ recordClass.meta.name }`;\n \n // return a promise mapping index names to whether they were\n // created or not\n return (\n Promise.props(\n // take the index meta data\n _.chain(recordClass.meta.indexes)\n // pick the ones with truth-y values\n .pickBy(\n (shouldIndex: boolean, indexName: string) => !!shouldIndex\n )\n // get the keys, which are the index names\n .keys()\n // and map each to the ensureIndex promise\n .map((indexName: string): [string, Promise] => {\n let promise = util.ensureIndex(\n this.r,\n this.conn,\n tableName,\n indexName\n );\n \n return [indexName, promise];\n })\n .fromPairs()\n .value()\n ) // Promise.props\n .tap((created: {[indexName: string]: boolean}) => {\n debug: \"indexes ENSURED\", created;\n \n if (wait) {\n debug: `waiting for indexes on ${ tableName }...`;\n \n return this.table(recordClass).indexWait().run(this.conn)\n .then(() => {\n debug: `indexes ready on ${ tableName }.`;\n });\n }\n })\n ); // return \n } // #ensureIndexes\n \n \n // Adapter API implementations\n // =========================================================================\n // \n \n \n /**\n * @private\n * @override\n */\n _get(\n recordClass: Class,\n id: Id,\n options: Object,\n ): Promise {\n let query = this.table(recordClass).get(id);\n \n if (options.join) {\n query = query.merge(function(instance) {\n return _.mapValues(options.join, ({recordClass, idProp}) => {\n return this.table(recordClass).get(instance(idProp));\n })\n })\n }\n \n return query.run(this.conn);\n }\n \n \n /**\n * @private\n * @override\n */\n _need(\n recordClass: Class,\n id: Id,\n options: Object,\n ): Promise {\n return this.get(recordClass, id, options)\n .then((doc: ?Document) => {\n if (doc === null) {\n throw new nrser.NotFoundError(\n `no ${ recordClass.name } found with id ${ id }`\n );\n }\n \n return doc;\n });\n } // #_need\n \n \n /**\n * @private\n * @override\n * \n * @param {Object} options\n * @param {boolean} options.compact\n * if true, the results should have keys with null values omitted.\n */\n _getByIds(\n recordClass: Class,\n ids: Array,\n options: Object,\n ): Promise<{[id: Id]: ?Record}> {\n const compacted = this\n .table(recordClass)\n .getAll(...ids)\n .run(this.conn)\n .then((cursor) => cursor.toArray())\n .then((docs) => {\n return _.keyBy(docs, 'id');\n });\n \n if (options.compact) {\n return compacted;\n }\n \n return compacted.then((byIds) => {\n _.each(ids, (id) => {\n if (!_.has(byIds, id)) {\n byIds[id] = null;\n }\n });\n \n return byIds;\n });\n } // #_getByIds\n \n \n /**\n * @private\n * @override\n */\n _needByIds(\n recordClass: Class,\n ids: Array,\n options: Object = {},\n ): Promise<{[id: Id]: Record}> {\n return this\n // call _getByIds with compact=true so that it doesn't add null entries\n ._getByIds(recordClass, ids, {compact: true})\n // then check if we got all of them\n .then((byIds) => {\n if (_.size(byIds) !== ids.length) {\n // something's missing, throw up\n const missingIds = _.difference(ids, _.keys(byIds));\n \n throw nrser.NotFoundError.squish(`\n could not find ${ recordClass.meta.name } with ids \n ${ missingIds }\n `);\n }\n \n return byIds;\n });\n } // #_needByIds\n \n \n /**\n * @private\n * @override\n */\n _all(\n recordClass: Class,\n options: Object\n ): Promise<{[id: Id]: Document}> {\n return this\n .table(recordClass)\n .run(this.conn)\n .then((cursor) => {\n return cursor.toArray();\n })\n .then((docs) => {\n return _.keyBy(docs, 'id');\n });\n }\n \n \n /**\n * internal implementation of {#slice} called after arguments have been\n * validated and normalized.\n */\n _slice(\n recordClass: Class,\n {\n start,\n end,\n }: {\n start: Integer,\n end?: Integer,\n }\n ): Promise> {\n // supermodel.Adapter#slice takes care of argument validation and\n // short-circuiting empty slices. when we get here we know:\n // \n // - end and limit are not both defined\n // - if end is defined\n // - it is an integer greater than start\n // - end - start > 0\n // \n \n if (start < 0) {\n // we're starting the slice at the end of the array, which rethink\n // doesn't natively support, so we need to convert it into a slice from\n // the beginning on a reverse-ordered cursor, then reverse the results.\n \n // the reserve end is just the negation of the (negative) start (making\n // it positive)\n const reverseEnd = -1 * start;\n \n // the reverse end is either 0 if no end was provided, or the negation\n const reserveStart = t.Nil.is(end) ? 0 : -1 * end;\n \n return this.table(recordClass)\n .orderBy({index: this.r.desc('createdAt')})\n .slice(reserveStart, reverseEnd)\n .run(this.conn)\n .then(cursor => cursor.toArray())\n .then(docs => docs.reverse());\n }\n \n return this.table(recordClass)\n .orderBy({index: this.r.asc('createdAt')})\n .slice(start, end)\n .run(this.conn)\n .then((cursor) => {\n return cursor.toArray();\n });\n } // #_slice\n \n \n /**\n * @private\n * @override\n * \n * @param {Object} options\n * for future use.\n */\n _sample(\n recordClass: Class,\n number: PositiveInteger,\n options: Object,\n ): Promise> {\n return this\n .table(recordClass)\n .sample(number)\n .run(this.conn);\n } // #_sample\n \n \n /**\n * insert a Record into the database.\n * \n * returns a new Record instance that reflects the changes (setting \n * `updatedAt`).\n */\n insert(\n record: Record,\n ): Promise {\n const data = record.makeObjectForWrite();\n \n return this.r\n .table(this.tableName(record.constructor))\n .insert(data)\n .run(this.conn)\n .then(this.handleWriteResponse.bind(this))\n .then(() => new record.constructor(data));\n } // #insert\n \n \n /**\n * replace a Record in the database.\n * \n * returns a new Record instance that reflects the changes (setting \n * `updatedAt`).\n */\n replace(\n record: Record,\n ): Promise {\n const data = record.makeObjectForWrite();\n \n return this.r\n .table(this.tableName(record.constructor))\n .get(record.id)\n .replace(data)\n .run(this.conn)\n .then(this.handleWriteResponse.bind(this))\n .then(() => new record.constructor(data));\n } // #replace\n \n /**\n * internal driver-specific implementation of {#update} called after\n * arguments have been validated and normalized.\n * \n * the updated Record instance is kept in {#update} and resolved from there;\n * this method only need to resolve `void` on success or reject with an\n * Error on failure.\n */\n _update(\n record: Record,\n props: Object,\n {\n check = true,\n } : {\n check?: boolean,\n } = {},\n ): Promise {\n let query = this.r\n .table(this.tableName(record.constructor))\n .get(record.id);\n \n if (check) {\n // we need to check that the rev hasn't changed from the version\n // we are updating\n query = query.update((data) => {\n return this.r.branch(\n data('rev').eq(record.rev),\n props,\n this.r.error(\"rev in database does not match record rev.\")\n );\n });\n \n } else {\n // we don't care what rev is in the db, just blast it\n query = query.update(props);\n }\n \n return query.run(this.conn)\n .then(this.handleWriteResponse.bind(this));\n } // #_update\n \n \n // adaptations\n // ===========\n \n} // RethinkAdapter", "static": true, "longname": "src/RethinkAdapter.js", "access": null, "description": null, "lineNumber": 1 }, { "__docId__": 1, "kind": "variable", "name": "Promise", "memberof": "src/RethinkAdapter.js", "static": true, "longname": "src/RethinkAdapter.js~Promise", "access": null, "export": false, "importPath": "@nrser/supermodel-rethinkdb/src/RethinkAdapter.js", "importStyle": null, "description": null, "lineNumber": 3, "undocument": true, "unknown": [ { "tagName": "@_undocument", "tagValue": "" } ], "type": { "types": [ "*" ] } }, { "__docId__": 2, "kind": "variable", "name": "_", "memberof": "src/RethinkAdapter.js", "static": true, "longname": "src/RethinkAdapter.js~_", "access": null, "export": false, "importPath": "@nrser/supermodel-rethinkdb/src/RethinkAdapter.js", "importStyle": null, "description": null, "lineNumber": 4, "undocument": true, "unknown": [ { "tagName": "@_undocument", "tagValue": "" } ], "type": { "types": [ "*" ] } }, { "__docId__": 3, "kind": "class", "name": "RethinkAdapter", "memberof": "src/RethinkAdapter.js", "static": true, "longname": "src/RethinkAdapter.js~RethinkAdapter", "access": null, "export": true, "importPath": "@nrser/supermodel-rethinkdb/src/RethinkAdapter.js", "importStyle": "{RethinkAdapter}", "description": "Supermodel Adapter for RethinkDB.", "lineNumber": 32, "interface": false, "extends": [ "@nrser/supermodel~Adapter" ] }, { "__docId__": 4, "kind": "constructor", "name": "constructor", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#constructor", "access": null, "description": "", "lineNumber": 43, "params": [ { "nullable": null, "types": [ "rethinkdb" ], "spread": false, "optional": true, "name": "rethinkdb", "description": "the module returned from require('rethinkdb').\n \n we need to pass it in so that we don't end up using a different \n instantiation than the one that created the connection." }, { "nullable": null, "types": [ "rethinkdb.Net.Connection" ], "spread": false, "optional": true, "name": "conn", "description": "connection to the rethink database." } ] }, { "__docId__": 5, "kind": "member", "name": "r", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#r", "access": null, "description": null, "lineNumber": 45, "undocument": true, "unknown": [ { "tagName": "@_undocument", "tagValue": "" } ], "type": { "types": [ "*" ] } }, { "__docId__": 6, "kind": "member", "name": "conn", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#conn", "access": null, "description": null, "lineNumber": 46, "undocument": true, "unknown": [ { "tagName": "@_undocument", "tagValue": "" } ], "type": { "types": [ "*" ] } }, { "__docId__": 7, "kind": "method", "name": "tableName", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#tableName", "access": null, "description": "get the table name for a Record class; uses the tcomb type name.", "lineNumber": 58, "params": [ { "name": "recordClass", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 8, "kind": "method", "name": "table", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#table", "access": null, "description": "get the rethink table for a Record class.", "lineNumber": 66, "params": [ { "name": "recordClass", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 9, "kind": "method", "name": "handleWriteResponse", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#handleWriteResponse", "access": null, "description": "handle write (insert, replace) response from RethinkDB, which has an \n`errors` field with the number of write errors.\n\nconvert it into a Promise rejection if present.", "lineNumber": 77, "params": [ { "name": "response", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 10, "kind": "method", "name": "ensureDBSetup", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#ensureDBSetup", "access": null, "description": "ensure the DB is setup for the record classes.\n\nincludes:\n\n1. ensure the database exists.\n2. for each Record class:\n 1. ensure the table exists.\n 2. ensure the indexes exist.", "lineNumber": 96, "params": [ { "name": "recordClasses", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 11, "kind": "method", "name": "ensureTables", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#ensureTables", "access": null, "description": "ensure tables for the Record classes have been created.\n\nreturns a Promise of an object with table names mapped to whether the\ntable had to be created or not.", "lineNumber": 112, "params": [ { "name": "recordClasses", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 12, "kind": "method", "name": "ensureIndexes", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#ensureIndexes", "access": null, "description": "ensure all the indexes declared in the Record class exist, creating if\nnecessary. if `wait` is true, uses `rethinkdb.indexWait` to wait for the\nindex to be ready.\n\nreturns a `Promise` that resolves when all done, or rejects on error.", "lineNumber": 142, "params": [ { "name": "recordClasses", "types": [ "*" ] }, { "name": "objectPattern1", "optional": true, "types": [ "{\"wait\": *}" ], "defaultRaw": {}, "defaultValue": "{}" } ], "return": { "types": [ "*" ] } }, { "__docId__": 13, "kind": "method", "name": "_get", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_get", "access": "private", "description": "", "lineNumber": 231, "params": [ { "name": "recordClass", "types": [ "*" ] }, { "name": "id", "types": [ "*" ] }, { "name": "options", "types": [ "*" ] } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 14, "kind": "method", "name": "_need", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_need", "access": "private", "description": "", "lineNumber": 254, "params": [ { "name": "recordClass", "types": [ "*" ] }, { "name": "id", "types": [ "*" ] }, { "name": "options", "types": [ "*" ] } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 15, "kind": "method", "name": "_getByIds", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_getByIds", "access": "private", "description": "", "lineNumber": 280, "params": [ { "nullable": null, "types": [ "Object" ], "spread": false, "optional": false, "name": "options", "description": "" }, { "nullable": null, "types": [ "boolean" ], "spread": false, "optional": false, "name": "options.compact", "description": "if true, the results should have keys with null values omitted." } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 16, "kind": "method", "name": "_needByIds", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_needByIds", "access": "private", "description": "", "lineNumber": 314, "params": [ { "name": "recordClass", "types": [ "*" ] }, { "name": "ids", "types": [ "*" ] }, { "name": "options", "optional": true, "types": [ "{}" ], "defaultRaw": {}, "defaultValue": "{}" } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 17, "kind": "method", "name": "_all", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_all", "access": "private", "description": "", "lineNumber": 343, "params": [ { "name": "recordClass", "types": [ "*" ] }, { "name": "options", "types": [ "*" ] } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 18, "kind": "method", "name": "_slice", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_slice", "access": null, "description": "internal implementation of {#slice} called after arguments have been\nvalidated and normalized.", "lineNumber": 363, "params": [ { "name": "recordClass", "types": [ "*" ] }, { "name": "objectPattern1", "types": [ "{\"start\": *, \"end\": *}" ], "defaultRaw": { "start": null, "end": null }, "defaultValue": "{\"start\":null,\"end\":null}" } ], "return": { "types": [ "*" ] } }, { "__docId__": 19, "kind": "method", "name": "_sample", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_sample", "access": "private", "description": "", "lineNumber": 419, "params": [ { "nullable": null, "types": [ "Object" ], "spread": false, "optional": false, "name": "options", "description": "for future use." } ], "return": { "types": [ "*" ] }, "override": true }, { "__docId__": 20, "kind": "method", "name": "insert", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#insert", "access": null, "description": "insert a Record into the database.\n\nreturns a new Record instance that reflects the changes (setting \n`updatedAt`).", "lineNumber": 437, "params": [ { "name": "record", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 21, "kind": "method", "name": "replace", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#replace", "access": null, "description": "replace a Record in the database.\n\nreturns a new Record instance that reflects the changes (setting \n`updatedAt`).", "lineNumber": 457, "params": [ { "name": "record", "types": [ "*" ] } ], "return": { "types": [ "*" ] } }, { "__docId__": 22, "kind": "method", "name": "_update", "memberof": "src/RethinkAdapter.js~RethinkAdapter", "generator": false, "async": false, "static": false, "longname": "src/RethinkAdapter.js~RethinkAdapter#_update", "access": null, "description": "internal driver-specific implementation of {#update} called after\narguments have been validated and normalized.\n\nthe updated Record instance is kept in {#update} and resolved from there;\nthis method only need to resolve `void` on success or reject with an\nError on failure.", "lineNumber": 479, "params": [ { "name": "record", "types": [ "*" ] }, { "name": "props", "types": [ "*" ] }, { "name": "objectPattern2", "optional": true, "types": [ "{\"check\": *}" ], "defaultRaw": {}, "defaultValue": "{}" } ], "return": { "types": [ "*" ] } }, { "__docId__": 23, "kind": "file", "name": "src/index.js", "content": "export * as util from './util';\nexport * from './RethinkAdapter';\n", "static": true, "longname": "src/index.js", "access": null, "description": null, "lineNumber": 1 }, { "__docId__": 24, "kind": "file", "name": "src/types.js", "content": "\n/**\n* interface for the rethinkdb module.\n*/\nexport type IRethinkDB = Object;\n\n/**\n* interface for a rethinkdb.net.Connection instance.\n*/\nexport type IConnection = Object;\n\n/**\n* what's returned by r.table()\n*/\nexport type ITable = Object;", "static": true, "longname": "src/types.js", "access": null, "description": null, "lineNumber": 1 }, { "__docId__": 25, "kind": "file", "name": "src/util.js", "content": "/**\n* utilities, many of which operate against rethinkdb independent of \n* Supermodel constructs.\n*/\n\n// @flow\n\nimport uuid from 'uuid';\nimport * as nrser from 'nrser';\nconst _ = nrser._;\nconst Promise = nrser.Promise;\n\n// types\nimport type {\n IRethinkDB,\n IConnection,\n} from './types';\n\n/**\n* attempt to connect to the database, re-scheduling an attempt with a back-off\n* timeout if it fails.\n* \n* wraps this all up in a Promise that resolved when the connection succeeds\n* or rejects when it runs out of attempts.\n*/\nfunction attemptToConnect(\n r: IRethinkDb,\n {\n resolve,\n reject,\n host,\n port,\n db,\n attemptNumber,\n maxAttempts,\n baseTimeout,\n maxTimeout,\n }: {\n resolve: Function,\n reject: Function,\n host: string,\n port: number,\n db: string,\n attemptNumber: number,\n maxAttempts: number,\n baseTimeout: number,\n maxTimeout: number,\n }\n): Promise {\n info: `attempt ${ attemptNumber } to connect to db`;\n \n r.connect(\n {host, db, port},\n (error: ?Error, conn: ?IConnection): void => {\n if (error) {\n error: `failed to connect to db on attempt ${ attemptNumber }`,\n {error};\n \n if (maxAttempts > 0 && attemptNumber >= maxAttempts) {\n error: \"out of attempts, rejecting.\"\n \n 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