@mando75/typeorm-graphql-loader
Version:
A dataloader which intelligently selects/joins the fields/relations from your TypeORM entities needed to resolve a GraphQL query
234 lines • 11.7 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.GraphQLQueryManager = void 0;
var LoaderSearchMethod_1 = require("./enums/LoaderSearchMethod");
var crypto = require("crypto");
var typeorm_1 = require("typeorm");
var GraphQLQueryResolver_1 = require("./GraphQLQueryResolver");
var Formatter_1 = require("./lib/Formatter");
var LoaderNamingStrategy_1 = require("./enums/LoaderNamingStrategy");
var GraphQLQueryManager = (function () {
function GraphQLQueryManager(_connection, options) {
if (options === void 0) { options = {}; }
var _a;
this._connection = _connection;
this._queue = [];
this._cache = new Map();
var defaultSearchMethod = options.defaultSearchMethod;
this._defaultLoaderSearchMethod =
defaultSearchMethod !== null && defaultSearchMethod !== void 0 ? defaultSearchMethod : LoaderSearchMethod_1.LoaderSearchMethod.ANY_POSITION;
this._resolver = new GraphQLQueryResolver_1.GraphQLQueryResolver(options);
this._formatter = new Formatter_1.Formatter((_a = options.namingStrategy) !== null && _a !== void 0 ? _a : LoaderNamingStrategy_1.LoaderNamingStrategyEnum.CAMELCASE);
}
GraphQLQueryManager.createTypeORMQueryBuilder = function (entityManager, name, alias) {
return entityManager
.getRepository(name)
.createQueryBuilder(alias)
.select([]);
};
GraphQLQueryManager._breakDownWhereExpression = function (where) {
if (where instanceof typeorm_1.Brackets) {
return { where: where, params: undefined };
}
else {
var asExpression = where;
return { where: asExpression.condition, params: asExpression.params };
}
};
GraphQLQueryManager.prototype.processQueryMeta = function (fields, where, alias) {
var hash = crypto.createHash("md5");
var key = hash
.update(JSON.stringify([where, fields, alias]))
.digest()
.toString("hex");
if (this._cache.has(key)) {
return {
fields: fields,
key: "",
item: this._cache.get(key),
found: true,
};
}
if (this._immediate) {
clearImmediate(this._immediate);
}
return {
fields: fields,
key: key,
found: false,
};
};
GraphQLQueryManager.prototype.addQueueItem = function (item) {
this._queue.push(item);
this._setImmediate();
};
GraphQLQueryManager.prototype.addCacheItem = function (key, value) {
this._cache.set(key, value);
};
GraphQLQueryManager.prototype._setImmediate = function () {
var _this = this;
this._immediate = setImmediate(function () { return _this._processQueue(); });
};
GraphQLQueryManager.prototype._processQueue = function () {
return __awaiter(this, void 0, void 0, function () {
var queue, queryRunner, e_1;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
queue = this._queue.splice(0, this._queue.length);
queryRunner = this._connection.createQueryRunner("slave");
_a.label = 1;
case 1:
_a.trys.push([1, 4, , 5]);
return [4, queryRunner.connect()];
case 2:
_a.sent();
return [4, Promise.all(queue.map(this._resolveQueueItem(queryRunner.manager)))];
case 3:
_a.sent();
return [3, 5];
case 4:
e_1 = _a.sent();
queue.forEach(function (q) {
q.reject(e_1);
_this._cache.delete(q.key);
});
return [3, 5];
case 5: return [4, queryRunner.release()];
case 6:
_a.sent();
return [2];
}
});
});
};
GraphQLQueryManager.prototype._resolveQueueItem = function (entityManager) {
var _this = this;
return function (item) { return __awaiter(_this, void 0, void 0, function () {
var name, alias, queryBuilder, promise;
var _this = this;
var _a;
return __generator(this, function (_b) {
name = typeof item.entity == "string" ? item.entity : item.entity.name;
alias = (_a = item.alias) !== null && _a !== void 0 ? _a : name;
queryBuilder = GraphQLQueryManager.createTypeORMQueryBuilder(entityManager, name, alias);
queryBuilder = this._resolver.createQuery(name, item.fields, entityManager.connection, queryBuilder, alias, item.context);
queryBuilder = this._addSelectFields(queryBuilder, alias, item.predicates.selectFields);
queryBuilder = this._addAndWhereConditions(queryBuilder, item.predicates.andWhere);
queryBuilder = this._addOrWhereConditions(queryBuilder, item.predicates.orWhere);
queryBuilder = this._addSearchConditions(queryBuilder, alias, item.predicates.search);
queryBuilder = this._addOrderByCondition(queryBuilder, item.predicates.order);
queryBuilder = this._addPagination(queryBuilder, item.pagination);
queryBuilder = item.ejectQueryCallback(queryBuilder);
if (item.pagination) {
promise = queryBuilder.getManyAndCount();
}
else if (item.many) {
promise = queryBuilder.getMany();
}
else {
promise = queryBuilder.getOne();
}
return [2, promise
.then(item.resolve, item.reject)
.finally(function () { return _this._cache.delete(item.key); })];
});
}); };
};
GraphQLQueryManager.prototype._addAndWhereConditions = function (qb, conditions) {
var initialWhere = conditions.shift();
if (!initialWhere)
return qb;
var _a = GraphQLQueryManager._breakDownWhereExpression(initialWhere), where = _a.where, params = _a.params;
qb = qb.where(where, params);
conditions.forEach(function (condition) {
var _a = GraphQLQueryManager._breakDownWhereExpression(condition), where = _a.where, params = _a.params;
qb = qb.andWhere(where, params);
});
return qb;
};
GraphQLQueryManager.prototype._addOrWhereConditions = function (qb, conditions) {
conditions.forEach(function (condition) {
var _a = GraphQLQueryManager._breakDownWhereExpression(condition), where = _a.where, params = _a.params;
qb = qb.orWhere(where, params);
});
return qb;
};
GraphQLQueryManager.prototype._addSearchConditions = function (qb, alias, searchConditions) {
this._formatSearchConditions(searchConditions, alias).forEach(function (_a) {
var query = _a.query, params = _a.params;
qb = qb.andWhere(query, params);
});
return qb;
};
GraphQLQueryManager.prototype._formatSearchConditions = function (conditions, alias) {
var _this = this;
return conditions.map(function (_a) {
var searchColumns = _a.searchColumns, searchMethod = _a.searchMethod, searchText = _a.searchText, caseSensitive = _a.caseSensitive;
var method = searchMethod || _this._defaultLoaderSearchMethod;
var likeQueryStrings = _this._formatter.formatSearchColumns(searchColumns, alias, caseSensitive);
var searchTextParam = _this._formatter.getSearchMethodMapping(method, searchText);
return {
query: "(".concat(likeQueryStrings.join(" OR "), ")"),
params: { searchText: searchTextParam },
};
});
};
GraphQLQueryManager.prototype._addPagination = function (queryBuilder, pagination) {
if (pagination) {
queryBuilder = queryBuilder.offset(pagination.offset);
queryBuilder = queryBuilder.limit(pagination.limit);
}
return queryBuilder;
};
GraphQLQueryManager.prototype._addOrderByCondition = function (queryBuilder, order) {
return queryBuilder.orderBy(order);
};
GraphQLQueryManager.prototype._addSelectFields = function (queryBuilder, alias, selectFields) {
var _this = this;
selectFields.forEach(function (field) {
queryBuilder = queryBuilder.addSelect(_this._formatter.columnSelection(alias, field), _this._formatter.aliasField(alias, field));
});
return queryBuilder;
};
return GraphQLQueryManager;
}());
exports.GraphQLQueryManager = GraphQLQueryManager;
//# sourceMappingURL=GraphQLQueryManager.js.map