import { IExecuteFunctions } from 'n8n-core'; import { GenericValue, IDataObject, INodeExecutionData, INodeType, INodeTypeDescription, } from 'n8n-workflow'; import { set } from 'lodash'; import * as redis from 'redis'; import * as util from 'util'; export class Redis implements INodeType { description: INodeTypeDescription = { displayName: 'Redis', name: 'redis', icon: 'file:redis.png', group: ['input'], version: 1, description: 'Gets, sends data to Redis and receives generic information.', defaults: { name: 'Redis', color: '#0033AA', }, inputs: ['main'], outputs: ['main'], credentials: [ { name: 'redis', required: true, } ], properties: [ { displayName: 'Operation', name: 'operation', type: 'options', options: [ { name: 'Delete', value: 'delete', description: 'Deletes a key from Redis.', }, { name: 'Get', value: 'get', description: 'Returns the value of a key from Redis.', }, { name: 'Info', value: 'info', description: 'Returns generic information about the Redis instance.', }, { name: 'Keys', value: 'keys', description: 'Returns all the keys matching a pattern.', }, { name: 'Set', value: 'set', description: 'Sets the value of a key in redis.', }, ], default: 'info', description: 'The operation to perform.', }, // ---------------------------------- // get // ---------------------------------- { displayName: 'Name', name: 'propertyName', type: 'string', displayOptions: { show: { operation: [ 'get' ], }, }, default: 'propertyName', required: true, description: 'Name of the property to write received data to.
Supports dot-notation.
Example: "data.person[0].name"', }, { displayName: 'Key', name: 'key', type: 'string', displayOptions: { show: { operation: [ 'delete' ], }, }, default: '', required: true, description: 'Name of the key to delete from Redis.', }, { displayName: 'Key', name: 'key', type: 'string', displayOptions: { show: { operation: [ 'get' ], }, }, default: '', required: true, description: 'Name of the key to get from Redis.', }, { displayName: 'Key Type', name: 'keyType', type: 'options', displayOptions: { show: { operation: [ 'get' ], }, }, options: [ { name: 'Automatic', value: 'automatic', description: 'Requests the type before requesting the data (slower).', }, { name: 'Hash', value: 'hash', description: 'Data in key is of type "hash".', }, { name: 'String', value: 'string', description: 'Data in key is of type "string".', }, { name: 'List', value: 'list', description: 'Data in key is of type "lists".', }, { name: 'Sets', value: 'sets', description: 'Data in key is of type "sets".', }, ], default: 'automatic', description: 'The type of the key to get.', }, // ---------------------------------- // keys // ---------------------------------- { displayName: 'Key Pattern', name: 'keyPattern', type: 'string', displayOptions: { show: { operation: [ 'keys' ], }, }, default: '', required: true, description: 'The key pattern for the keys to return.', }, // ---------------------------------- // set // ---------------------------------- { displayName: 'Key', name: 'key', type: 'string', displayOptions: { show: { operation: [ 'set' ], }, }, default: '', required: true, description: 'Name of the key to set in Redis.', }, { displayName: 'Value', name: 'value', type: 'string', displayOptions: { show: { operation: [ 'set' ], }, }, default: '', description: 'The value to write in Redis.', }, { displayName: 'Key Type', name: 'keyType', type: 'options', displayOptions: { show: { operation: [ 'set' ], }, }, options: [ { name: 'Automatic', value: 'automatic', description: 'Tries to figure out the type automatically depending on the data.', }, { name: 'Hash', value: 'hash', description: 'Data in key is of type "hash".', }, { name: 'String', value: 'string', description: 'Data in key is of type "string".', }, { name: 'List', value: 'list', description: 'Data in key is of type "lists".', }, { name: 'Sets', value: 'sets', description: 'Data in key is of type "sets".', }, ], default: 'automatic', description: 'The type of the key to set.', }, { displayName: 'Expire', name: 'expire', type: 'boolean', displayOptions: { show: { operation: [ 'set' ], }, }, default: false, description: 'Set a timeout on key ?', }, { displayName: 'TTL', name: 'ttl', type: 'number', typeOptions: { minValue: 1, }, displayOptions: { show: { operation: [ 'set' ], expire: [ true, ], }, }, default: 60, description: 'Number of seconds before key expiration.', } ] }; execute(this: IExecuteFunctions): Promise { // Parses the given value in a number if it is one else returns a string function getParsedValue (value: string): string | number { if (value.match(/^[\d\.]+$/) === null) { // Is a string return value; } else { // Is a number return parseFloat(value); } } // Converts the Redis Info String into an object function convertInfoToObject(stringData: string): IDataObject { const returnData: IDataObject = {}; let key:string, value:string; for (const line of stringData.split('\n')) { if (['#', ''].includes(line.charAt(0))) { continue; } [key, value] = line.split(':'); if (key === undefined || value === undefined) { continue; } value = value.trim(); if (value.includes('=')) { returnData[key] = {}; let key2: string, value2: string; for (const keyValuePair of value.split(',')) { [key2, value2] = keyValuePair.split('='); (returnData[key] as IDataObject)[key2] = getParsedValue(value2); } } else { returnData[key] = getParsedValue(value); } } return returnData; } async function getValue(client: redis.RedisClient, keyName: string, type?: string) { if (type === undefined || type === 'automatic') { // Request the type first const clientType = util.promisify(client.type).bind(client); type = await clientType(keyName); } if (type === 'string') { const clientGet = util.promisify(client.get).bind(client); return await clientGet(keyName); } else if (type === 'hash') { const clientHGetAll = util.promisify(client.hgetall).bind(client); return await clientHGetAll(keyName); } else if (type === 'list') { const clientLRange = util.promisify(client.lrange).bind(client); return await clientLRange(keyName, 0, -1); } else if (type === 'sets') { const clientSMembers = util.promisify(client.smembers).bind(client); return await clientSMembers(keyName); } } async function setValue(client: redis.RedisClient, keyName: string, value: string | number | object | string[] | number[], expire: boolean, ttl: number, type?: string) { if (type === undefined || type === 'automatic') { // Request the type first if (typeof value === 'string') { type = 'string'; } else if (Array.isArray(value)) { type = 'list'; } else if (typeof value === 'object') { type = 'hash'; } else { throw new Error('Could not identify the type to set. Please set it manually!'); } } if (type === 'string') { const clientSet = util.promisify(client.set).bind(client); await clientSet(keyName, value.toString()); } else if (type === 'hash') { const clientHset = util.promisify(client.hset).bind(client); for (const key of Object.keys(value)) { await clientHset(keyName, key, (value as IDataObject)[key]!.toString()); } } else if (type === 'list') { const clientLset = util.promisify(client.lset).bind(client); for (let index = 0; index < (value as string[]).length; index++) { await clientLset(keyName, index, (value as IDataObject)[index]!.toString()); } } if (expire === true) { const clientExpire = util.promisify(client.expire).bind(client); await clientExpire(keyName, ttl); } return; } return new Promise((resolve, reject) => { // TODO: For array and object fields it should not have a "value" field it should // have a parameter field for a path. Because it is not possible to set // array, object via parameter directly (should maybe be possible?!?!) // Should maybe have a parameter which is JSON. const credentials = this.getCredentials('redis'); if (credentials === undefined) { throw new Error('No credentials got returned!'); } const redisOptions: redis.ClientOpts = { host: credentials.host as string, port: credentials.port as number, }; if (credentials.password) { redisOptions.password = credentials.password as string; } const client = redis.createClient(redisOptions); const operation = this.getNodeParameter('operation', 0) as string; client.on('error', (err: Error) => { reject(err); }); client.on('ready', async (err: Error | null) => { if (operation === 'info') { const clientInfo = util.promisify(client.info).bind(client); const result = await clientInfo(); resolve(this.prepareOutputData([{ json: convertInfoToObject(result as unknown as string) }])); client.quit(); } else if (['delete', 'get', 'keys', 'set'].includes(operation)) { const items = this.getInputData(); const returnItems: INodeExecutionData[] = []; let item: INodeExecutionData; for (let itemIndex = 0; itemIndex < items.length; itemIndex++) { item = { json: {} }; if (operation === 'delete') { const keyDelete = this.getNodeParameter('key', itemIndex) as string; const clientDel = util.promisify(client.del).bind(client); // @ts-ignore await clientDel(keyDelete); returnItems.push(items[itemIndex]); } else if (operation === 'get') { const propertyName = this.getNodeParameter('propertyName', itemIndex) as string; const keyGet = this.getNodeParameter('key', itemIndex) as string; const keyType = this.getNodeParameter('keyType', itemIndex) as string; const value = await getValue(client, keyGet, keyType); set(item.json, propertyName, value); returnItems.push(item); } else if (operation === 'keys') { const keyPattern = this.getNodeParameter('keyPattern', itemIndex) as string; const clientKeys = util.promisify(client.keys).bind(client); const keys = await clientKeys(keyPattern); const promises: { [key: string]: GenericValue; } = {}; for (const keyName of keys) { promises[keyName] = await getValue(client, keyName); } for (const keyName of keys) { set(item.json, keyName, await promises[keyName]); } returnItems.push(item); } else if (operation === 'set') { const keySet = this.getNodeParameter('key', itemIndex) as string; const value = this.getNodeParameter('value', itemIndex) as string; const keyType = this.getNodeParameter('keyType', itemIndex) as string; const expire = this.getNodeParameter('expire', itemIndex, false) as boolean; const ttl = this.getNodeParameter('ttl', itemIndex, -1) as number; await setValue(client, keySet, value, expire, ttl, keyType); returnItems.push(items[itemIndex]); } } resolve(this.prepareOutputData(returnItems)); } }); }); } }