@fabric-es/fabric-cqrs/dist/types/reducer.js

Hyperledger Fabric middleware for event sourcing and cqrs pattern

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.computeEntity = exports.trackingReducer = exports.getReducer = void 0;
const debug_1 = __importDefault(require("debug"));
const _1 = require(".");
const debug = debug_1.default('types:reducer');
const getReducer = (callback) => (history, initialState) => {
    return history.reduce((entity, event) => {
        var _a, _b, _c;
        const ntt = callback(entity, event);
        if (ntt) {
            if (!ntt[_1.CREATOR_FIELD] && ((_a = event.payload) === null || _a === void 0 ? void 0 : _a[_1.CREATOR_FIELD]))
                ntt[_1.CREATOR_FIELD] = event.payload[_1.CREATOR_FIELD];
            if (!ntt[_1.CREATED_FIELD] && ((_b = event.payload) === null || _b === void 0 ? void 0 : _b[_1.CREATED_FIELD]))
                ntt[_1.CREATED_FIELD] = event.payload[_1.CREATED_FIELD];
            if ((_c = event.payload) === null || _c === void 0 ? void 0 : _c[_1.TS_FIELD])
                ntt[_1.TS_FIELD] = event.payload[_1.TS_FIELD];
        }
        return ntt;
    }, initialState);
};
exports.getReducer = getReducer;
const trackingReducer = (commits) => {
    const result = commits.reduce((tracks, commit) => {
        var _a, _b;
        if (((_a = commit.events) === null || _a === void 0 ? void 0 : _a.filter((event) => event.type === _1.TRACK_EVENT).length) <= 0 &&
            !tracks[_1.ORGAN_FIELD].includes(commit.mspId)) {
            tracks[_1.ORGAN_FIELD].push(commit.mspId);
        }
        (_b = commit.events) === null || _b === void 0 ? void 0 : _b.forEach((event) => {
            if (event.type === _1.TRACK_EVENT) {
                if (!tracks[_1.TRACK_FIELD][event.payload.entityName])
                    tracks[_1.TRACK_FIELD][event.payload.entityName] = [];
                tracks[_1.TRACK_FIELD][event.payload.entityName].push(commit.mspId);
            }
        });
        return tracks;
    }, {
        [_1.ORGAN_FIELD]: [],
        [_1.TRACK_FIELD]: {},
    });
    debug('trackingReducer:result, %O', result);
    const olen = result[_1.ORGAN_FIELD].length;
    const tlen = Object.values(result[_1.TRACK_FIELD]).length;
    return olen > 0 && tlen > 0
        ? result
        : olen > 0
            ? { [_1.ORGAN_FIELD]: result[_1.ORGAN_FIELD] }
            : tlen > 0
                ? { [_1.TRACK_FIELD]: result[_1.TRACK_FIELD] }
                : null;
};
exports.trackingReducer = trackingReducer;
const computeEntity = (commits, reducer) => {
    var _a;
    const history = [];
    commits.forEach(({ events }) => events.forEach((event) => history.push(event)));
    debug('computeEntity:history, %O', history);
    const state = reducer(history);
    debug('computeEntity:state, before appending trackingReducer, %O', state);
    if (state) {
        Object.assign(state, exports.trackingReducer(commits));
        debug('computeEntity:state, after appending trackingReducer, %O', state);
    }
    else {
        if (commits.length === 1 &&
            ((_a = commits[0].events) === null || _a === void 0 ? void 0 : _a.filter((event) => event.type === _1.TRACK_EVENT).length) === 1) {
            debug('computeEntity:commits, %O', commits);
            return { reduced: false };
        }
    }
    return { state, reduced: true };
};
exports.computeEntity = computeEntity;
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