1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
import config from "$config";
import { sleep } from "$lib/utils";
import { createClient, defineScript } from "redis";
import { warn } from "$lib/logging";
let SCRIPT = `
local balanceKey = KEYS[1]
local creditKey = KEYS[2]
local amount = tonumber(ARGV[1])
local tip = tonumber(ARGV[2])
local fee = tonumber(ARGV[3])
local ourfee = tonumber(ARGV[4])
local balance = tonumber(redis.call('get', balanceKey) or '0')
local credit = tonumber(redis.call('get', creditKey) or '0')
local covered = math.min(credit, ourfee)
ourfee = ourfee - covered
if balance < amount + tip + fee + ourfee then
return {err = 'Insufficient funds'}
end
redis.call('decrby', creditKey, tostring(math.floor(covered)))
redis.call('decrby', balanceKey, tostring(math.floor(amount + tip + fee + ourfee)))
return {ok = 'ok'}
`;
let debit = defineScript({
NUMBER_OF_KEYS: 2,
SCRIPT,
transformArguments: (...args) => args.map(a => a.toString())
});
export const db = createClient({
url: config.db,
scripts: { debit }
});
await db.connect();
export default db;
export let g = async k => {
let v = await db.get(k);
try {
return JSON.parse(v);
} catch (e) {
return v;
}
};
export let s = (k, v) => {
if (k === "user:null" || k === "user:undefined") {
warn("###### NULL USER #######");
console.trace();
}
db.set(k, JSON.stringify(v));
};
let retries = {};
export let t = async (k, f) => {
try {
await db.watch(k);
await f(await db.get(k), db);
} catch (err) {
if (!err.message.includes("watch")) throw err;
let r = retries[k] || 0;
retries[k] = r + 1;
if (r < 10) {
await sleep(100);
await t(k, f);
} else {
delete retries[k];
throw new Error("unable to obtain lock");
}
}
delete retries[k];
};
|
