gverse/dist/gverse/connection.js

Object Graph Mapper for Dgraph

"use strict";
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
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var __importStar = (this && this.__importStar) || function (mod) {
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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};
var __generator = (this && this.__generator) || function (thisArg, body) {
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var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Connection = void 0;
var dgraph = __importStar(require("dgraph-js"));
var dgraph_js_1 = require("dgraph-js");
var chalk_1 = __importDefault(require("chalk"));
var debug_logger_1 = __importDefault(require("./debug-logger"));
var transaction_1 = require("./transaction");
var retry_1 = require("./retry");
/* Catch any unhandled promises and report in logs */
process.on("unhandledRejection", function (reason, p) {
    console.warn("Unhandled Rejection at: Promise", p, "reason:", reason);
    // application specific logging, throwing an error, or other logic here
});
/** Connection represents a GRPC connection to the dgraph server. */
var Connection = /** @class */ (function () {
    function Connection(environment) {
        this.verified = false;
        this.environment = environment;
        this.stub = new dgraph.DgraphClientStub("".concat(environment.host, ":").concat(environment.port), dgraph_js_1.grpc.credentials.createInsecure());
        this.client = new dgraph.DgraphClient(this.stub);
        this.client.setDebugMode(environment.debug);
    }
    /** Verifies the connection. There's no connect operation per-se. */
    Connection.prototype.connect = function (announce) {
        if (announce === void 0) { announce = false; }
        return __awaiter(this, void 0, void 0, function () {
            var tx, res, error_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 2, , 3]);
                        tx = new transaction_1.Transaction(this, true, false, true);
                        return [4 /*yield*/, tx.query("{total (func: has(dgraph.type)) {count(uid)}}")];
                    case 1:
                        res = _a.sent();
                        if (announce)
                            console.log("🔅 Connected to", "Dgraph zero at", chalk_1.default.blue.bold(this.environment.host) +
                                ":" +
                                chalk_1.default.blue.bold("".concat(this.environment.port)), "with", chalk_1.default.cyan.bold(res.total.pop().count), "vertices\n");
                        this.verified = true;
                        (0, debug_logger_1.default)("Connected to dgraph");
                        return [2 /*return*/, true];
                    case 2:
                        error_1 = _a.sent();
                        (0, debug_logger_1.default)("Could not connect to Dgraph alpha at ".concat(this.environment.host, ":").concat(this.environment.port), error_1);
                        this.verified = false;
                        return [2 /*return*/, false];
                    case 3: return [2 /*return*/];
                }
            });
        });
    };
    /** Returns a new transaction with auto commit (immediate) option. */
    Connection.prototype.newTransaction = function (autoCommit, readOnly) {
        if (autoCommit === void 0) { autoCommit = false; }
        if (readOnly === void 0) { readOnly = false; }
        return new transaction_1.Transaction(this, autoCommit, false, readOnly);
    };
    /** Immediate query with autoCommit transaction */
    Connection.prototype.query = function (query, variables) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this.newTransaction(true, true).query(query, variables)];
                    case 1: return [2 /*return*/, _a.sent()];
                }
            });
        });
    };
    /** Clears the graph by dropping all vertices, edges and predicates
     * of the given type - or all types.
     */
    Connection.prototype.clear = function (type) {
        return __awaiter(this, void 0, void 0, function () {
            var res, op, e_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 7, , 8]);
                        if (!type) return [3 /*break*/, 4];
                        (0, debug_logger_1.default)("Clearing vertices of type", type);
                        return [4 /*yield*/, this.query("{vertices (func: type(\"".concat(type, "\")) { uid }}"))];
                    case 1:
                        res = _a.sent();
                        if (!(res === null || res === void 0 ? void 0 : res.vertices)) return [3 /*break*/, 3];
                        return [4 /*yield*/, this.newTransaction(true).delete(res.vertices)];
                    case 2:
                        _a.sent();
                        _a.label = 3;
                    case 3: return [3 /*break*/, 6];
                    case 4:
                        (0, debug_logger_1.default)("Clearing all vertices");
                        op = new dgraph.Operation();
                        op.setDropAll(true);
                        return [4 /*yield*/, this.client.alter(op)];
                    case 5:
                        _a.sent();
                        _a.label = 6;
                    case 6: return [3 /*break*/, 8];
                    case 7:
                        e_1 = _a.sent();
                        (0, debug_logger_1.default)("Failed to clear:", e_1);
                        throw Error(e_1);
                    case 8: return [2 /*return*/];
                }
            });
        });
    };
    Connection.prototype.applySchema = function (schema, retries) {
        if (retries === void 0) { retries = 0; }
        return __awaiter(this, void 0, void 0, function () {
            var op, e_2;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        _a.trys.push([0, 2, , 6]);
                        (0, debug_logger_1.default)("Apply schema take", retries, "schema: ", schema);
                        op = new dgraph.Operation();
                        op.setSchema(schema);
                        return [4 /*yield*/, this.client.alter(op)];
                    case 1:
                        _a.sent();
                        return [3 /*break*/, 6];
                    case 2:
                        e_2 = _a.sent();
                        if (!(0, retry_1.shouldRetry)(e_2, retries)) return [3 /*break*/, 5];
                        return [4 /*yield*/, (0, retry_1.waitPromise)("schema ".concat(schema))];
                    case 3:
                        _a.sent();
                        return [4 /*yield*/, this.applySchema(schema, retries + 1)];
                    case 4: return [2 /*return*/, _a.sent()];
                    case 5:
                        (0, debug_logger_1.default)(e_2);
                        throw Error(e_2);
                    case 6: return [2 /*return*/];
                }
            });
        });
    };
    Connection.prototype.disconnect = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                (0, debug_logger_1.default)("Disconnecting from dgraph");
                this.stub.close();
                return [2 /*return*/];
            });
        });
    };
    return Connection;
}());
exports.Connection = Connection;
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