serverless-offline-msk
Version:
A serverless offline plugin that enables AWS MSK events
217 lines (216 loc) • 12.3 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))
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}
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) {
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op = body.call(thisArg, _);
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if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
import AWS from 'aws-sdk';
import { Kafka } from 'kafkajs';
var defaultEvent = {
arn: 'arn:*',
topic: '',
batchSize: 100,
maximumBatchingWindow: 1,
startingPosition: 'LATEST'
};
export var getMskEvent = function (event) {
return __assign(__assign({}, defaultEvent), event);
};
export var defaultKafkaClientId = 'serverless-offline-msk-client';
var ServerlessOfflineAwsMskPlugin = /** @class */ (function () {
function ServerlessOfflineAwsMskPlugin(serverless, options) {
var _this = this;
var _a, _b;
var _c, _d, _e;
this.serverless = serverless;
this.options = options;
var custom = ((_b = (_a = this.serverless) === null || _a === void 0 ? void 0 : _a.service) === null || _b === void 0 ? void 0 : _b.custom) || {};
this.customOptions = custom['serverless-offline-msk'] || {};
(_c = this.customOptions).allowAutoTopicCreation || (_c.allowAutoTopicCreation = true);
(_d = this.customOptions).clientId || (_d.clientId = defaultKafkaClientId);
(_e = this.customOptions).brokers || (_e.brokers = []);
this.kafka = new Kafka({
brokers: this.customOptions.brokers,
clientId: this.customOptions.clientId
});
this.hooks = {
'offline:start:init': function () { return _this.init(); },
'offline:start:end': function () { return _this.end(); }
};
}
ServerlessOfflineAwsMskPlugin.prototype.init = function () {
var _this = this;
var _a, _b;
var _loop_1 = function (_name, fn) {
// Can't do anything else if the config is bad
if (!fn.events || !Array.isArray(fn.events)) {
return "break";
}
// Filter out non-MSK events
var mskEvents = fn.events
.filter(function (event) { return (event.msk ? true : false); })
.map(function (event) { return getMskEvent(event.msk); });
// Loop over each event, and run them async
mskEvents.forEach(function (event) { return __awaiter(_this, void 0, void 0, function () { return __generator(this, function (_a) {
return [2 /*return*/, this.connectAndListen(fn, event)];
}); }); });
};
// Loop over every function in the service and look for MSK events.
for (var _i = 0, _c = Object.entries(((_b = (_a = this.serverless) === null || _a === void 0 ? void 0 : _a.service) === null || _b === void 0 ? void 0 : _b.functions) || {}); _i < _c.length; _i++) {
var _d = _c[_i], _name = _d[0], fn = _d[1];
var state_1 = _loop_1(_name, fn);
if (state_1 === "break")
break;
}
};
ServerlessOfflineAwsMskPlugin.prototype.connectAndListen = function (fn, event) {
return __awaiter(this, void 0, void 0, function () {
var lambdaParams, lambda, prefix, id, groupId, consumer;
var _this = this;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
// If the event is disabled, stop.
if (event.enabled === false) {
return [2 /*return*/];
}
lambdaParams = {
endpoint: 'http://localhost:3002',
region: 'us-east-1',
credentials: {
accessKeyId: 'root',
secretAccessKey: 'root'
}
};
lambda = new AWS.Lambda(lambdaParams);
prefix = fn.name || "serverless-offline-msk";
id = (Math.random() + 1).toString(36).substring(2);
groupId = "".concat(prefix, "-").concat(id);
consumer = this.kafka.consumer({
groupId: groupId,
allowAutoTopicCreation: this.customOptions.allowAutoTopicCreation,
maxInFlightRequests: event.batchSize
});
return [4 /*yield*/, consumer.connect()];
case 1:
_a.sent();
return [4 /*yield*/, consumer.subscribe({
topic: event.topic,
fromBeginning: event.startingPosition === 'LATEST' ? false : true
})];
case 2:
_a.sent();
return [4 /*yield*/, consumer.run({
eachBatch: function (_a) {
var batch = _a.batch, resolveOffset = _a.resolveOffset, heartbeat = _a.heartbeat;
return __awaiter(_this, void 0, void 0, function () {
var records, _i, _b, message, key, invokeParams;
var _c, _d;
return __generator(this, function (_e) {
switch (_e.label) {
case 0:
records = {};
_i = 0, _b = batch.messages;
_e.label = 1;
case 1:
if (!(_i < _b.length)) return [3 /*break*/, 4];
message = _b[_i];
key = "".concat(batch.topic, "-").concat(batch.partition);
records[key] || (records[key] = []);
records[key].push({
topic: batch.topic,
partition: batch.partition,
offset: Number.parseInt(message.offset),
timestamp: Number.parseInt(message.timestamp),
timestampType: 'CREATE_TIME',
key: "".concat((_c = message.key) === null || _c === void 0 ? void 0 : _c.toString()),
value: "".concat((_d = message.value) === null || _d === void 0 ? void 0 : _d.toString('base64')),
headers: []
});
resolveOffset(message.offset);
return [4 /*yield*/, heartbeat()];
case 2:
_e.sent();
_e.label = 3;
case 3:
_i++;
return [3 /*break*/, 1];
case 4:
invokeParams = {
FunctionName: "".concat(fn.name),
InvocationType: 'Event',
LogType: 'None',
Payload: JSON.stringify({
eventSourceArn: 'arn:*',
eventSource: 'aws:kafka',
records: records
})
};
lambda.invoke(invokeParams, function (err, data) {
if (err) {
console.log('INVOKE ERR', err);
}
else {
console.log('INVOKE OK', data);
}
});
return [2 /*return*/];
}
});
});
}
})];
case 3:
_a.sent();
return [2 /*return*/];
}
});
});
};
ServerlessOfflineAwsMskPlugin.prototype.end = function () {
// TODO
};
return ServerlessOfflineAwsMskPlugin;
}());
export default ServerlessOfflineAwsMskPlugin;