n8n/packages/nodes-base/nodes/Kafka/KafkaTrigger.node.ts

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import {
Kafka as apacheKafka,
KafkaConfig,
logLevel,
SASLOptions,
} from 'kafkajs';
import {
ITriggerFunctions,
} from 'n8n-core';
import {
IDataObject,
INodeType,
INodeTypeDescription,
ITriggerResponse,
:sparkles: Improve node error handling (#1309) * Add path mapping and response error interfaces * Add error handling and throwing functionality * Refactor error handling into a single function * Re-implement error handling in Hacker News node * Fix linting details * Re-implement error handling in Spotify node * Re-implement error handling in G Suite Admin node * :construction: create basic setup NodeError * :construction: add httpCodes * :construction: add path priolist * :construction: handle statusCode in error, adjust interfaces * :construction: fixing type issues w/Ivan * :construction: add error exploration * 👔 fix linter issues * :wrench: improve object check * :construction: remove path passing from NodeApiError * :construction: add multi error + refactor findProperty method * 👔 allow any * :wrench: handle multi error message callback * :zap: change return type of callback * :zap: add customCallback to MultiError * :construction: refactor to use INode * :hammer: handle arrays, continue search after first null property found * 🚫 refactor method access * :construction: setup NodeErrorView * :zap: change timestamp to Date.now * :books: Add documentation for methods and constants * :construction: change message setting * 🚚 move NodeErrors to workflow * :sparkles: add new ErrorView for Nodes * :art: improve error notification * :art: refactor interfaces * :zap: add WorkflowOperationError, refactor error throwing * 👕 fix linter issues * :art: rename param * :bug: fix handling normal errors * :zap: add usage of NodeApiError * :art: fix throw new error instead of constructor * :art: remove unnecessary code/comments * :art: adjusted spacing + updated status messages * :art: fix tab indentation * ✨ Replace current errors with custom errors (#1576) * :zap: Introduce NodeApiError in catch blocks * :zap: Introduce NodeOperationError in nodes * :zap: Add missing errors and remove incompatible * :zap: Fix NodeOperationError in incompatible nodes * :wrench: Adjust error handling in missed nodes PayPal, FileMaker, Reddit, Taiga and Facebook Graph API nodes * :hammer: Adjust Strava Trigger node error handling * :hammer: Adjust AWS nodes error handling * :hammer: Remove duplicate instantiation of NodeApiError * :bug: fix strava trigger node error handling * Add XML parsing to NodeApiError constructor (#1633) * :bug: Remove type annotation from catch variable * :sparkles: Add XML parsing to NodeApiError * :zap: Simplify error handling in Rekognition node * :zap: Pass in XML flag in generic functions * :fire: Remove try/catch wrappers at call sites * :hammer: Refactor setting description from XML * :hammer: Refactor let to const in resource loaders * :zap: Find property in parsed XML * :zap: Change let to const * :fire: Remove unneeded try/catch block * :shirt: Fix linting issues * :bug: Fix errors from merge conflict resolution * :zap: Add custom errors to latest contributions * :shirt: Fix linting issues * :zap: Refactor MongoDB helpers for custom errors * :bug: Correct custom error type * :zap: Apply feedback to A nodes * :zap: Apply feedback to missed A node * :zap: Apply feedback to B-D nodes * :zap: Apply feedback to E-F nodes * :zap: Apply feedback to G nodes * :zap: Apply feedback to H-L nodes * :zap: Apply feedback to M nodes * :zap: Apply feedback to P nodes * :zap: Apply feedback to R nodes * :zap: Apply feedback to S nodes * :zap: Apply feedback to T nodes * :zap: Apply feedback to V-Z nodes * :zap: Add HTTP code to iterable node error * :hammer: Standardize e as error * :hammer: Standardize err as error * :zap: Fix error handling for non-standard nodes Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <1849459+BHesseldieck@users.noreply.github.com>
2021-04-16 09:33:36 -07:00
NodeOperationError,
} from 'n8n-workflow';
export class KafkaTrigger implements INodeType {
description: INodeTypeDescription = {
displayName: 'Kafka Trigger',
name: 'kafkaTrigger',
icon: 'file:kafka.svg',
group: ['trigger'],
version: 1,
description: 'Consume messages from a Kafka topic',
defaults: {
name: 'Kafka Trigger',
color: '#000000',
},
inputs: [],
outputs: ['main'],
credentials: [
{
name: 'kafka',
required: true,
},
],
properties: [
{
displayName: 'Topic',
name: 'topic',
type: 'string',
default: '',
required: true,
placeholder: 'topic-name',
description: 'Name of the queue of topic to consume from.',
},
{
displayName: 'Group ID',
name: 'groupId',
type: 'string',
default: '',
required: true,
placeholder: 'n8n-kafka',
description: 'ID of the consumer group.',
},
{
displayName: 'Options',
name: 'options',
type: 'collection',
default: {},
placeholder: 'Add Option',
options: [
{
displayName: 'Allow Topic Creation',
name: 'allowAutoTopicCreation',
type: 'boolean',
default: false,
description: 'Allow sending message to a previously non exisiting topic .',
},
{
displayName: 'Read messages from beginning',
name: 'fromBeginning',
type: 'boolean',
default: true,
description: 'Read message from beginning .',
},
{
displayName: 'JSON Parse Message',
name: 'jsonParseMessage',
type: 'boolean',
default: false,
description: 'Try to parse the message to an object.',
},
{
displayName: 'Only Message',
name: 'onlyMessage',
type: 'boolean',
displayOptions: {
show: {
jsonParseMessage: [
true,
],
},
},
default: false,
description: 'Returns only the message property.',
},
{
displayName: 'Session Timeout',
name: 'sessionTimeout',
type: 'number',
default: 30000,
description: 'The time to await a response in ms.',
},
],
},
],
};
async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
const topic = this.getNodeParameter('topic') as string;
const groupId = this.getNodeParameter('groupId') as string;
const credentials = await this.getCredentials('kafka') as IDataObject;
const brokers = (credentials.brokers as string || '').split(',').map(item => item.trim()) as string[];
const clientId = credentials.clientId as string;
const ssl = credentials.ssl as boolean;
const config: KafkaConfig = {
clientId,
brokers,
ssl,
logLevel: logLevel.ERROR,
};
if (credentials.authentication === true) {
if(!(credentials.username && credentials.password)) {
:sparkles: Improve node error handling (#1309) * Add path mapping and response error interfaces * Add error handling and throwing functionality * Refactor error handling into a single function * Re-implement error handling in Hacker News node * Fix linting details * Re-implement error handling in Spotify node * Re-implement error handling in G Suite Admin node * :construction: create basic setup NodeError * :construction: add httpCodes * :construction: add path priolist * :construction: handle statusCode in error, adjust interfaces * :construction: fixing type issues w/Ivan * :construction: add error exploration * 👔 fix linter issues * :wrench: improve object check * :construction: remove path passing from NodeApiError * :construction: add multi error + refactor findProperty method * 👔 allow any * :wrench: handle multi error message callback * :zap: change return type of callback * :zap: add customCallback to MultiError * :construction: refactor to use INode * :hammer: handle arrays, continue search after first null property found * 🚫 refactor method access * :construction: setup NodeErrorView * :zap: change timestamp to Date.now * :books: Add documentation for methods and constants * :construction: change message setting * 🚚 move NodeErrors to workflow * :sparkles: add new ErrorView for Nodes * :art: improve error notification * :art: refactor interfaces * :zap: add WorkflowOperationError, refactor error throwing * 👕 fix linter issues * :art: rename param * :bug: fix handling normal errors * :zap: add usage of NodeApiError * :art: fix throw new error instead of constructor * :art: remove unnecessary code/comments * :art: adjusted spacing + updated status messages * :art: fix tab indentation * ✨ Replace current errors with custom errors (#1576) * :zap: Introduce NodeApiError in catch blocks * :zap: Introduce NodeOperationError in nodes * :zap: Add missing errors and remove incompatible * :zap: Fix NodeOperationError in incompatible nodes * :wrench: Adjust error handling in missed nodes PayPal, FileMaker, Reddit, Taiga and Facebook Graph API nodes * :hammer: Adjust Strava Trigger node error handling * :hammer: Adjust AWS nodes error handling * :hammer: Remove duplicate instantiation of NodeApiError * :bug: fix strava trigger node error handling * Add XML parsing to NodeApiError constructor (#1633) * :bug: Remove type annotation from catch variable * :sparkles: Add XML parsing to NodeApiError * :zap: Simplify error handling in Rekognition node * :zap: Pass in XML flag in generic functions * :fire: Remove try/catch wrappers at call sites * :hammer: Refactor setting description from XML * :hammer: Refactor let to const in resource loaders * :zap: Find property in parsed XML * :zap: Change let to const * :fire: Remove unneeded try/catch block * :shirt: Fix linting issues * :bug: Fix errors from merge conflict resolution * :zap: Add custom errors to latest contributions * :shirt: Fix linting issues * :zap: Refactor MongoDB helpers for custom errors * :bug: Correct custom error type * :zap: Apply feedback to A nodes * :zap: Apply feedback to missed A node * :zap: Apply feedback to B-D nodes * :zap: Apply feedback to E-F nodes * :zap: Apply feedback to G nodes * :zap: Apply feedback to H-L nodes * :zap: Apply feedback to M nodes * :zap: Apply feedback to P nodes * :zap: Apply feedback to R nodes * :zap: Apply feedback to S nodes * :zap: Apply feedback to T nodes * :zap: Apply feedback to V-Z nodes * :zap: Add HTTP code to iterable node error * :hammer: Standardize e as error * :hammer: Standardize err as error * :zap: Fix error handling for non-standard nodes Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <1849459+BHesseldieck@users.noreply.github.com>
2021-04-16 09:33:36 -07:00
throw new NodeOperationError(this.getNode(), 'Username and password are required for authentication');
}
config.sasl = {
username: credentials.username as string,
password: credentials.password as string,
mechanism: credentials.saslMechanism as string,
} as SASLOptions;
}
const kafka = new apacheKafka(config);
const consumer = kafka.consumer({ groupId });
await consumer.connect();
const options = this.getNodeParameter('options', {}) as IDataObject;
await consumer.subscribe({ topic, fromBeginning: (options.fromBeginning)? true : false });
const self = this;
const startConsumer = async () => {
await consumer.run({
eachMessage: async ({ topic, message }) => {
let data: IDataObject = {};
let value = message.value?.toString() as string;
if (options.jsonParseMessage) {
try {
value = JSON.parse(value);
:sparkles: Improve node error handling (#1309) * Add path mapping and response error interfaces * Add error handling and throwing functionality * Refactor error handling into a single function * Re-implement error handling in Hacker News node * Fix linting details * Re-implement error handling in Spotify node * Re-implement error handling in G Suite Admin node * :construction: create basic setup NodeError * :construction: add httpCodes * :construction: add path priolist * :construction: handle statusCode in error, adjust interfaces * :construction: fixing type issues w/Ivan * :construction: add error exploration * 👔 fix linter issues * :wrench: improve object check * :construction: remove path passing from NodeApiError * :construction: add multi error + refactor findProperty method * 👔 allow any * :wrench: handle multi error message callback * :zap: change return type of callback * :zap: add customCallback to MultiError * :construction: refactor to use INode * :hammer: handle arrays, continue search after first null property found * 🚫 refactor method access * :construction: setup NodeErrorView * :zap: change timestamp to Date.now * :books: Add documentation for methods and constants * :construction: change message setting * 🚚 move NodeErrors to workflow * :sparkles: add new ErrorView for Nodes * :art: improve error notification * :art: refactor interfaces * :zap: add WorkflowOperationError, refactor error throwing * 👕 fix linter issues * :art: rename param * :bug: fix handling normal errors * :zap: add usage of NodeApiError * :art: fix throw new error instead of constructor * :art: remove unnecessary code/comments * :art: adjusted spacing + updated status messages * :art: fix tab indentation * ✨ Replace current errors with custom errors (#1576) * :zap: Introduce NodeApiError in catch blocks * :zap: Introduce NodeOperationError in nodes * :zap: Add missing errors and remove incompatible * :zap: Fix NodeOperationError in incompatible nodes * :wrench: Adjust error handling in missed nodes PayPal, FileMaker, Reddit, Taiga and Facebook Graph API nodes * :hammer: Adjust Strava Trigger node error handling * :hammer: Adjust AWS nodes error handling * :hammer: Remove duplicate instantiation of NodeApiError * :bug: fix strava trigger node error handling * Add XML parsing to NodeApiError constructor (#1633) * :bug: Remove type annotation from catch variable * :sparkles: Add XML parsing to NodeApiError * :zap: Simplify error handling in Rekognition node * :zap: Pass in XML flag in generic functions * :fire: Remove try/catch wrappers at call sites * :hammer: Refactor setting description from XML * :hammer: Refactor let to const in resource loaders * :zap: Find property in parsed XML * :zap: Change let to const * :fire: Remove unneeded try/catch block * :shirt: Fix linting issues * :bug: Fix errors from merge conflict resolution * :zap: Add custom errors to latest contributions * :shirt: Fix linting issues * :zap: Refactor MongoDB helpers for custom errors * :bug: Correct custom error type * :zap: Apply feedback to A nodes * :zap: Apply feedback to missed A node * :zap: Apply feedback to B-D nodes * :zap: Apply feedback to E-F nodes * :zap: Apply feedback to G nodes * :zap: Apply feedback to H-L nodes * :zap: Apply feedback to M nodes * :zap: Apply feedback to P nodes * :zap: Apply feedback to R nodes * :zap: Apply feedback to S nodes * :zap: Apply feedback to T nodes * :zap: Apply feedback to V-Z nodes * :zap: Add HTTP code to iterable node error * :hammer: Standardize e as error * :hammer: Standardize err as error * :zap: Fix error handling for non-standard nodes Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <b.hesseldieck@gmail.com> Co-authored-by: Ben Hesseldieck <1849459+BHesseldieck@users.noreply.github.com>
2021-04-16 09:33:36 -07:00
} catch (error) { }
}
data.message = value;
data.topic = topic;
if (options.onlyMessage) {
//@ts-ignore
data = value;
}
self.emit([self.helpers.returnJsonArray([data])]);
},
});
};
startConsumer();
// The "closeFunction" function gets called by n8n whenever
// the workflow gets deactivated and can so clean up.
async function closeFunction() {
await consumer.disconnect();
}
// The "manualTriggerFunction" function gets called by n8n
// when a user is in the workflow editor and starts the
// workflow manually. So the function has to make sure that
// the emit() gets called with similar data like when it
// would trigger by itself so that the user knows what data
// to expect.
async function manualTriggerFunction() {
startConsumer();
}
return {
closeFunction,
manualTriggerFunction,
};
}
}