merkle-patricia-tree/dist.browser/db.js

"use strict";
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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;
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Object.defineProperty(exports, "__esModule", { value: true });
exports.DB = exports.ENCODING_OPTS = void 0;
var level = require('level-mem');
exports.ENCODING_OPTS = { keyEncoding: 'binary', valueEncoding: 'binary' };
/**
 * DB is a thin wrapper around the underlying levelup db,
 * which validates inputs and sets encoding type.
 */
var DB = /** @class */ (function () {
    /**
     * Initialize a DB instance. If `leveldb` is not provided, DB
     * defaults to an [in-memory store](https://github.com/Level/memdown).
     * @param leveldb - An abstract-leveldown compliant store
     */
    function DB(leveldb) {
        this._leveldb = leveldb !== null && leveldb !== void 0 ? leveldb : level();
    }
    /**
     * Retrieves a raw value from leveldb.
     * @param key
     * @returns A Promise that resolves to `Buffer` if a value is found or `null` if no value is found.
     */
    DB.prototype.get = function (key) {
        return __awaiter(this, void 0, void 0, function () {
            var value, error_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        value = null;
                        _a.label = 1;
                    case 1:
                        _a.trys.push([1, 3, , 4]);
                        return [4 /*yield*/, this._leveldb.get(key, exports.ENCODING_OPTS)];
                    case 2:
                        value = _a.sent();
                        return [3 /*break*/, 4];
                    case 3:
                        error_1 = _a.sent();
                        if (error_1.notFound) {
                            // not found, returning null
                        }
                        else {
                            throw error_1;
                        }
                        return [3 /*break*/, 4];
                    case 4: return [2 /*return*/, value];
                }
            });
        });
    };
    /**
     * Writes a value directly to leveldb.
     * @param key The key as a `Buffer`
     * @param value The value to be stored
     */
    DB.prototype.put = function (key, val) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this._leveldb.put(key, val, exports.ENCODING_OPTS)];
                    case 1:
                        _a.sent();
                        return [2 /*return*/];
                }
            });
        });
    };
    /**
     * Removes a raw value in the underlying leveldb.
     * @param keys
     */
    DB.prototype.del = function (key) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this._leveldb.del(key, exports.ENCODING_OPTS)];
                    case 1:
                        _a.sent();
                        return [2 /*return*/];
                }
            });
        });
    };
    /**
     * Performs a batch operation on db.
     * @param opStack A stack of levelup operations
     */
    DB.prototype.batch = function (opStack) {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0: return [4 /*yield*/, this._leveldb.batch(opStack, exports.ENCODING_OPTS)];
                    case 1:
                        _a.sent();
                        return [2 /*return*/];
                }
            });
        });
    };
    /**
     * Returns a copy of the DB instance, with a reference
     * to the **same** underlying leveldb instance.
     */
    DB.prototype.copy = function () {
        return new DB(this._leveldb);
    };
    return DB;
}());
exports.DB = DB;
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