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import type { Thread, Comment } from '../models/Thread';
import { Client, types } from 'pg';
var connectionString = "postgres://scale:secret@db/scale?sslmode=disable";
let client: Client;
export function InitPostgres() {
client = new Client(connectionString);
client.connect();
types.setTypeParser(types.builtins.INT8, (val) => {
return Number(val)
});
}
export function ClosePostgres() {
client.end();
}
export function CustomQuery(query: string, callback: (r: { status: number, data: any }) => void) {
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 500, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200; r.data = res.rows;
}
callback(r);
});
}
export function GetBoards(callback: (r: { status: number, data: any }) => void) {
let query = `
select s.nspname as board
from pg_catalog.pg_namespace s
where nspname != 'pg_toast' and nspname != 'pg_catalog'
and nspname != 'public' and nspname != 'information_schema';`; // to remove the default schemas
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 404, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200; r.data = [];
for(let board of res.rows)
r.data.push(board.board);
}
callback(r);
});
}
export function CreateBoard(name: string, callback: (r: { status: number, data: any }) => void) {
let query = `
create schema ${name};
create table ${name}.thread(
id serial primary key,
timestamp bigint,
title text NOT NULL,
content text NOT NULL,
image text,
imagetype text
);
create table ${name}.comment(
id serial primary key,
tid int,
timestamp bigint,
content text NOT NULL,
image text,
imagetype text,
constraints fk_tid
foreign key(tid)
references ${name}.thread(id)
);`;
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 500, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200;
}
callback(r);
});
}
export function GetBoard(board: string, callback: (r: { status: number, data: any }) => void) {
let query = `
select * from ${board}.thread
order by timestamp desc;`;
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 404, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200; r.data = res.rows;
}
callback(r);
});
}
export function CreateThread(board: string, t: Thread, callback: (r: { status: number, data: any }) => void) {
let query = `
insert into ${board}.thread (
timestamp, title, content, image, imagetype
) values (
${Math.floor(Date.now() / 1000)},
'${t.title}', '${t.content}', '${t.image}', '${t.imagetype}'
);`;
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 404, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200;
}
callback(r);
});
}
export function GetThread(board: string, tid: string, callback: (r: { status: number, data: any }) => void) {
// copied from https://www.youtube.com/watch?v=_lLqt5exlMs&t=114s
let query = `
with thread_comments as (
select DISTINCT c.tid, (
select jsonb_agg(_)
from (select id, timestamp, content, image, imagetype
from ${board}.comment cc where cc.tid = c.tid)
as _ order by c.timestamp asc
) as comment
from ${board}.comment c
)
select t.*, COALESCE(c.comment, '[]'::jsonb) as comments
from ${board}.thread t
left join thread_comments c on (c.tid = t.id)
where t.id = ${tid};`;
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 404, data: undefined };
if (err) {
r.data = err.message;
} else if(res.rows.length != 0) {
r.status = 200; r.data = (res.rows as Array<Thread>)[0];
}
callback(r);
});
}
export function CreateComment(board: string, tid: string, comment: Comment, callback: (r: { status: number, data: any }) => void) {
let query = `
insert into ${board}.comment (
tid, timestamp, content, image, imagetype
) values (
${tid}, ${Math.floor(Date.now() / 1000)},
'${comment.content}', '${comment.image}', '${comment.imagetype}'
);`;
client.query(query, (err, res) => {
let r: { status: number, data: any } = { status: 404, data: undefined };
if (err) {
r.data = err.message;
} else {
r.status = 200;
}
callback(r);
});
}
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