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November 26, 2018 18:08
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import * as redis from 'redis' | |
import { promisify } from 'util'; | |
import { Comment } from './types' | |
const redisOptions = { | |
host: process.env.redisHost, | |
port: process.env.redisPort, | |
} | |
let client; | |
export interface ICommentStorage { | |
get(key): Promise<[Comment]>; | |
add(key: string, userId: string, content: string): Promise<[Comment]>; | |
edit(key: string, msgId: number, userId: string, content: string): Promise<[Comment]>; | |
delete(key: string, msgId: number, userId: string): Promise<[Comment]>; | |
} | |
export class CommentStorage { | |
// CRUD functions | |
// Get Comments : fetch all comments related to it the module(rfq,quote) | |
get(key): Promise<[Comment]> { | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const getAsync = promisify(client.lrange).bind(client); | |
client.on('ready', () => { | |
console.log('redis is ready.'); | |
}); | |
client.on('end', () => { | |
console.log('redis closed.'); | |
}); | |
return getAsync(key, 0, -1).then((res) => { | |
return res | |
.map(row => JSON.parse(row)) | |
.filter(row => (row.deleted == false)); | |
}); | |
} | |
getNotFiletered(key): Promise<[Comment]> { | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const getAsync = promisify(client.lrange).bind(client); | |
return getAsync(key, 0, -1).then((res) => { | |
return res | |
.map(row => JSON.parse(row)); | |
}); | |
} | |
// Add Comments : appends a comment to the list for a specific item | |
async add(key, userId, content): Promise<[Comment]> { | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const lindexAsync = promisify(client.lindex).bind(client); | |
let lastElement = await lindexAsync(key, -1); | |
let new_msgId = 0; | |
if (lastElement != null) { | |
lastElement = JSON.parse(lastElement); | |
new_msgId = lastElement.msgId + 1; | |
} | |
let comment: Comment = { | |
msgId: new_msgId, | |
userId: userId, | |
content: content, | |
createdAt: Date.now(), | |
deleted: false | |
} | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const addAsync = promisify(client.rpush).bind(client); | |
let value = JSON.stringify(comment); | |
return addAsync(key, value).then((status) => { | |
return this.get(key); | |
}); | |
} | |
// Edit Comments : loop through comments and edit the one with the specific msgId | |
async edit(key, msgId, userId, content): Promise<[Comment]> { | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const setAsync = promisify(client.lset).bind(client); | |
let comments = await this.getNotFiletered(key); | |
for (let i = 0; i < comments.length; i++) { | |
if (comments[i].msgId == msgId && comments[i].userId == userId) { | |
if (content) comments[i].content = content; | |
setAsync(key, i, JSON.stringify(comments[i])); | |
} | |
} | |
return this.get(key); | |
} | |
//Delete Comments : loop through the comments and delete the comment with specific msgId | |
async delete(key, msgId, userId): Promise<[Comment]> { | |
client = redis.createClient(redisOptions.port, redisOptions.host); | |
const setAsync = promisify(client.lset).bind(client); | |
let comments = await this.getNotFiletered(key); | |
for (let i = 0; i < comments.length; i++) { | |
if (comments[i].msgId === msgId && userId == comments[i].userId | |
&& comments[i].deleted == false) { | |
comments[i].deleted = true; | |
setAsync(key, i, JSON.stringify(comments[i])); | |
} | |
} | |
return this.get(key); | |
} | |
} |
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