@othree.io/chisel
Version:
Event sourcing made easy
37 lines • 2.17 kB
JavaScript
;
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());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.handle = void 0;
const optional_1 = require("@othree.io/optional");
const cerillo_1 = require("@othree.io/cerillo");
const handle = (loadState) => (handleCommand) => (calculateNewState) => (publishEvent) => (command) => __awaiter(void 0, void 0, void 0, function* () {
return (yield loadState((0, optional_1.Optional)('contextId' in command ? command.contextId : undefined)))
.mapAsync((state) => __awaiter(void 0, void 0, void 0, function* () {
return (yield handleCommand(state.state, command))
.mapAsync((events) => __awaiter(void 0, void 0, void 0, function* () {
const theEvents = (0, cerillo_1.match)(events)
.when(_ => Array.isArray(_)).then(_ => _)
.default(_ => ([_]))
.get();
return (yield calculateNewState(command, state, theEvents))
.mapAsync((newState) => __awaiter(void 0, void 0, void 0, function* () {
const notifications = newState.newEvents.map((event) => __awaiter(void 0, void 0, void 0, function* () { return publishEvent(event, newState.state); }));
yield Promise.allSettled(notifications);
return {
state: newState.state,
events: newState.newEvents
};
}));
}));
}));
});
exports.handle = handle;
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