aws-event-stream
Version:
A simple and fast EventStore for AWS.
166 lines • 8.35 kB
JavaScript
;
var __assign = (this && this.__assign) || function () {
__assign = Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
return __assign.apply(this, arguments);
};
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 {
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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; }
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.DynamodbProvider = void 0;
var AWS = require("aws-sdk");
var dynamodb_1 = require("aws-sdk/clients/dynamodb");
/**
* A Persistence Provider that handle all the data in Dynamodb.
*/
var DynamodbProvider = /** @class */ (function () {
function DynamodbProvider(config) {
this.config = config;
AWS.config.update(config.awsConfig);
this.documentClient = new dynamodb_1.DocumentClient({
convertEmptyValues: true,
endpoint: config.dynamodb.endpointUrl,
httpOptions: config.dynamodb.httpOptions,
maxRetries: config.dynamodb.maxRetries
});
}
DynamodbProvider.prototype.addEvent = function (stream, data) {
return __awaiter(this, void 0, void 0, function () {
var now, commitTimestamp, commitTimetampSeconds, event, record;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
now = new Date();
commitTimestamp = now.getTime();
commitTimetampSeconds = Math.floor(commitTimestamp / 1000);
event = {
aggregation_streamid: "" + this.getKey(stream),
commitTimestamp: commitTimestamp,
eventType: data.eventType,
payload: data,
stream: stream,
ttl: this.config.dynamodb.ttl ? (commitTimetampSeconds + this.config.dynamodb.ttl) : undefined,
};
record = {
Item: event,
TableName: this.config.dynamodb.tableName,
};
return [4 /*yield*/, this.documentClient.put(record).promise()];
case 1:
_a.sent();
return [2 /*return*/, {
commitTimestamp: commitTimestamp,
eventType: data.eventType,
payload: data,
}];
}
});
});
};
DynamodbProvider.prototype.getEvents = function (stream, offset, limit) {
if (offset === void 0) { offset = 0; }
if (limit === void 0) { limit = -1; }
return __awaiter(this, void 0, void 0, function () {
var exclusiveStartKey, filter, pageSize, items, queryOutput, events;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
filter = {
ExpressionAttributeValues: { ':key': this.getKey(stream) },
KeyConditionExpression: 'aggregation_streamid = :key',
ScanIndexForward: false,
TableName: this.config.dynamodb.tableName,
};
pageSize = offset + limit;
if (pageSize > 0) {
filter = __assign(__assign({}, filter), { Limit: limit });
}
items = [];
_a.label = 1;
case 1:
filter = __assign(__assign({}, filter), { ExclusiveStartKey: exclusiveStartKey });
return [4 /*yield*/, this.documentClient.query(filter).promise()];
case 2:
queryOutput = (_a.sent());
exclusiveStartKey = queryOutput.LastEvaluatedKey || null;
items = items.concat(queryOutput.Items);
_a.label = 3;
case 3:
if (items.length < pageSize) return [3 /*break*/, 1];
_a.label = 4;
case 4:
events = items.map(function (data, index) {
return {
commitTimestamp: data.commitTimestamp,
eventType: data.eventType || data.payload.eventType,
payload: data.payload,
sequence: index,
ttl: data.ttl,
};
});
return [2 /*return*/, pageSize <= 0 ? events.slice(offset) : events.slice(offset, pageSize)];
}
});
});
};
DynamodbProvider.prototype.getAggregations = function (offset, limit) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
throw new Error('Method not supported');
});
});
};
DynamodbProvider.prototype.getStreams = function (aggregation, offset, limit) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
throw new Error('Method not supported');
});
});
};
DynamodbProvider.prototype.getKey = function (stream) {
return stream.aggregation + ":" + stream.id;
};
return DynamodbProvider;
}());
exports.DynamodbProvider = DynamodbProvider;
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