mirror of
https://github.com/n8n-io/n8n.git
synced 2024-11-15 09:04:07 -08:00
419 lines
9.7 KiB
TypeScript
419 lines
9.7 KiB
TypeScript
import type { KafkaConfig, SASLOptions, TopicMessages } from 'kafkajs';
|
|
import { CompressionTypes, Kafka as apacheKafka } from 'kafkajs';
|
|
|
|
import { SchemaRegistry } from '@kafkajs/confluent-schema-registry';
|
|
|
|
import type {
|
|
IExecuteFunctions,
|
|
ICredentialDataDecryptedObject,
|
|
ICredentialsDecrypted,
|
|
ICredentialTestFunctions,
|
|
IDataObject,
|
|
INodeCredentialTestResult,
|
|
INodeExecutionData,
|
|
INodeType,
|
|
INodeTypeDescription,
|
|
} from 'n8n-workflow';
|
|
import { ApplicationError, NodeOperationError } from 'n8n-workflow';
|
|
import { generatePairedItemData } from '../../utils/utilities';
|
|
|
|
export class Kafka implements INodeType {
|
|
description: INodeTypeDescription = {
|
|
displayName: 'Kafka',
|
|
name: 'kafka',
|
|
icon: 'file:kafka.svg',
|
|
group: ['transform'],
|
|
version: 1,
|
|
description: 'Sends messages to a Kafka topic',
|
|
defaults: {
|
|
name: 'Kafka',
|
|
},
|
|
inputs: ['main'],
|
|
outputs: ['main'],
|
|
credentials: [
|
|
{
|
|
name: 'kafka',
|
|
required: true,
|
|
testedBy: 'kafkaConnectionTest',
|
|
},
|
|
],
|
|
properties: [
|
|
{
|
|
displayName: 'Topic',
|
|
name: 'topic',
|
|
type: 'string',
|
|
default: '',
|
|
placeholder: 'topic-name',
|
|
description: 'Name of the queue of topic to publish to',
|
|
},
|
|
{
|
|
displayName: 'Send Input Data',
|
|
name: 'sendInputData',
|
|
type: 'boolean',
|
|
default: true,
|
|
description: 'Whether to send the data the node receives as JSON to Kafka',
|
|
},
|
|
{
|
|
displayName: 'Message',
|
|
name: 'message',
|
|
type: 'string',
|
|
displayOptions: {
|
|
show: {
|
|
sendInputData: [false],
|
|
},
|
|
},
|
|
default: '',
|
|
description: 'The message to be sent',
|
|
},
|
|
{
|
|
displayName: 'JSON Parameters',
|
|
name: 'jsonParameters',
|
|
type: 'boolean',
|
|
default: false,
|
|
},
|
|
{
|
|
displayName: 'Use Schema Registry',
|
|
name: 'useSchemaRegistry',
|
|
type: 'boolean',
|
|
default: false,
|
|
description: 'Whether to use Confluent Schema Registry',
|
|
},
|
|
{
|
|
displayName: 'Schema Registry URL',
|
|
name: 'schemaRegistryUrl',
|
|
type: 'string',
|
|
required: true,
|
|
displayOptions: {
|
|
show: {
|
|
useSchemaRegistry: [true],
|
|
},
|
|
},
|
|
placeholder: 'https://schema-registry-domain:8081',
|
|
default: '',
|
|
description: 'URL of the schema registry',
|
|
},
|
|
{
|
|
displayName: 'Use Key',
|
|
name: 'useKey',
|
|
type: 'boolean',
|
|
default: false,
|
|
description: 'Whether to use a message key',
|
|
},
|
|
{
|
|
displayName: 'Key',
|
|
name: 'key',
|
|
type: 'string',
|
|
required: true,
|
|
displayOptions: {
|
|
show: {
|
|
useKey: [true],
|
|
},
|
|
},
|
|
placeholder: '',
|
|
default: '',
|
|
description: 'The message key',
|
|
},
|
|
{
|
|
displayName: 'Event Name',
|
|
name: 'eventName',
|
|
type: 'string',
|
|
required: true,
|
|
displayOptions: {
|
|
show: {
|
|
useSchemaRegistry: [true],
|
|
},
|
|
},
|
|
default: '',
|
|
description: 'Namespace and Name of Schema in Schema Registry (namespace.name)',
|
|
},
|
|
{
|
|
displayName: 'Headers',
|
|
name: 'headersUi',
|
|
placeholder: 'Add Header',
|
|
type: 'fixedCollection',
|
|
displayOptions: {
|
|
show: {
|
|
jsonParameters: [false],
|
|
},
|
|
},
|
|
typeOptions: {
|
|
multipleValues: true,
|
|
},
|
|
default: {},
|
|
options: [
|
|
{
|
|
name: 'headerValues',
|
|
displayName: 'Header',
|
|
values: [
|
|
{
|
|
displayName: 'Key',
|
|
name: 'key',
|
|
type: 'string',
|
|
default: '',
|
|
},
|
|
{
|
|
displayName: 'Value',
|
|
name: 'value',
|
|
type: 'string',
|
|
default: '',
|
|
},
|
|
],
|
|
},
|
|
],
|
|
},
|
|
{
|
|
displayName: 'Headers (JSON)',
|
|
name: 'headerParametersJson',
|
|
type: 'json',
|
|
displayOptions: {
|
|
show: {
|
|
jsonParameters: [true],
|
|
},
|
|
},
|
|
default: '',
|
|
description: 'Header parameters as JSON (flat object)',
|
|
},
|
|
{
|
|
displayName: 'Options',
|
|
name: 'options',
|
|
type: 'collection',
|
|
default: {},
|
|
placeholder: 'Add Option',
|
|
options: [
|
|
{
|
|
displayName: 'Acks',
|
|
name: 'acks',
|
|
type: 'boolean',
|
|
default: false,
|
|
description: 'Whether or not producer must wait for acknowledgement from all replicas',
|
|
},
|
|
{
|
|
displayName: 'Compression',
|
|
name: 'compression',
|
|
type: 'boolean',
|
|
default: false,
|
|
description: 'Whether to send the data in a compressed format using the GZIP codec',
|
|
},
|
|
{
|
|
displayName: 'Timeout',
|
|
name: 'timeout',
|
|
type: 'number',
|
|
default: 30000,
|
|
description: 'The time to await a response in ms',
|
|
},
|
|
],
|
|
},
|
|
],
|
|
};
|
|
|
|
methods = {
|
|
credentialTest: {
|
|
async kafkaConnectionTest(
|
|
this: ICredentialTestFunctions,
|
|
credential: ICredentialsDecrypted,
|
|
): Promise<INodeCredentialTestResult> {
|
|
const credentials = credential.data as ICredentialDataDecryptedObject;
|
|
try {
|
|
const brokers = ((credentials.brokers as string) || '')
|
|
.split(',')
|
|
.map((item) => item.trim());
|
|
|
|
const clientId = credentials.clientId as string;
|
|
|
|
const ssl = credentials.ssl as boolean;
|
|
|
|
const config: KafkaConfig = {
|
|
clientId,
|
|
brokers,
|
|
ssl,
|
|
};
|
|
if (credentials.authentication === true) {
|
|
if (!(credentials.username && credentials.password)) {
|
|
// eslint-disable-next-line n8n-nodes-base/node-execute-block-wrong-error-thrown
|
|
throw new ApplicationError('Username and password are required for authentication', {
|
|
level: 'warning',
|
|
});
|
|
}
|
|
config.sasl = {
|
|
username: credentials.username as string,
|
|
password: credentials.password as string,
|
|
mechanism: credentials.saslMechanism as string,
|
|
} as SASLOptions;
|
|
}
|
|
|
|
const kafka = new apacheKafka(config);
|
|
|
|
await kafka.admin().connect();
|
|
await kafka.admin().disconnect();
|
|
return {
|
|
status: 'OK',
|
|
message: 'Authentication successful',
|
|
};
|
|
} catch (error) {
|
|
return {
|
|
status: 'Error',
|
|
message: error.message,
|
|
};
|
|
}
|
|
},
|
|
},
|
|
};
|
|
|
|
async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
|
|
const items = this.getInputData();
|
|
const itemData = generatePairedItemData(items.length);
|
|
|
|
const length = items.length;
|
|
|
|
const topicMessages: TopicMessages[] = [];
|
|
|
|
let responseData: IDataObject[];
|
|
|
|
try {
|
|
const options = this.getNodeParameter('options', 0);
|
|
const sendInputData = this.getNodeParameter('sendInputData', 0) as boolean;
|
|
|
|
const useSchemaRegistry = this.getNodeParameter('useSchemaRegistry', 0) as boolean;
|
|
|
|
const timeout = options.timeout as number;
|
|
|
|
let compression = CompressionTypes.None;
|
|
|
|
const acks = options.acks === true ? 1 : 0;
|
|
|
|
if (options.compression === true) {
|
|
compression = CompressionTypes.GZIP;
|
|
}
|
|
|
|
const credentials = await this.getCredentials('kafka');
|
|
|
|
const brokers = ((credentials.brokers as string) || '').split(',').map((item) => item.trim());
|
|
|
|
const clientId = credentials.clientId as string;
|
|
|
|
const ssl = credentials.ssl as boolean;
|
|
|
|
const config: KafkaConfig = {
|
|
clientId,
|
|
brokers,
|
|
ssl,
|
|
};
|
|
|
|
if (credentials.authentication === true) {
|
|
if (!(credentials.username && credentials.password)) {
|
|
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 producer = kafka.producer();
|
|
|
|
await producer.connect();
|
|
|
|
let message: string | Buffer;
|
|
|
|
for (let i = 0; i < length; i++) {
|
|
if (sendInputData) {
|
|
message = JSON.stringify(items[i].json);
|
|
} else {
|
|
message = this.getNodeParameter('message', i) as string;
|
|
}
|
|
|
|
if (useSchemaRegistry) {
|
|
try {
|
|
const schemaRegistryUrl = this.getNodeParameter('schemaRegistryUrl', 0) as string;
|
|
const eventName = this.getNodeParameter('eventName', 0) as string;
|
|
|
|
const registry = new SchemaRegistry({ host: schemaRegistryUrl });
|
|
const id = await registry.getLatestSchemaId(eventName);
|
|
|
|
message = await registry.encode(id, JSON.parse(message));
|
|
} catch (exception) {
|
|
throw new NodeOperationError(
|
|
this.getNode(),
|
|
'Verify your Schema Registry configuration',
|
|
);
|
|
}
|
|
}
|
|
|
|
const topic = this.getNodeParameter('topic', i) as string;
|
|
|
|
const jsonParameters = this.getNodeParameter('jsonParameters', i);
|
|
|
|
const useKey = this.getNodeParameter('useKey', i) as boolean;
|
|
|
|
const key = useKey ? (this.getNodeParameter('key', i) as string) : null;
|
|
|
|
let headers;
|
|
|
|
if (jsonParameters) {
|
|
headers = this.getNodeParameter('headerParametersJson', i) as string;
|
|
try {
|
|
headers = JSON.parse(headers);
|
|
} catch (exception) {
|
|
throw new NodeOperationError(this.getNode(), 'Headers must be a valid json');
|
|
}
|
|
} else {
|
|
const values = (this.getNodeParameter('headersUi', i) as IDataObject)
|
|
.headerValues as IDataObject[];
|
|
headers = {};
|
|
if (values !== undefined) {
|
|
for (const value of values) {
|
|
//@ts-ignore
|
|
headers[value.key] = value.value;
|
|
}
|
|
}
|
|
}
|
|
|
|
topicMessages.push({
|
|
topic,
|
|
messages: [
|
|
{
|
|
value: message,
|
|
headers,
|
|
key,
|
|
},
|
|
],
|
|
});
|
|
}
|
|
|
|
responseData = await producer.sendBatch({
|
|
topicMessages,
|
|
timeout,
|
|
compression,
|
|
acks,
|
|
});
|
|
|
|
if (responseData.length === 0) {
|
|
responseData.push({
|
|
success: true,
|
|
});
|
|
}
|
|
|
|
await producer.disconnect();
|
|
|
|
const executionData = this.helpers.constructExecutionMetaData(
|
|
this.helpers.returnJsonArray(responseData),
|
|
{ itemData },
|
|
);
|
|
|
|
return [executionData];
|
|
} catch (error) {
|
|
if (this.continueOnFail()) {
|
|
return [[{ json: { error: error.message }, pairedItem: itemData }]];
|
|
} else {
|
|
throw error;
|
|
}
|
|
}
|
|
}
|
|
}
|