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9 |
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import { createHash } from 'node:crypto'; |
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2
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import { Cache } from '@/ExpressBeansTypes'; |
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3
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9 |
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import { logger, registeredMethods } from '@/core'; |
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import type { Request, Response } from 'express'; |
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5
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9 |
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import { Executor } from '@/core/executor'; |
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6
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7
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type BeanFunction = (...args: any) => any |
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8
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type CacheEntry = { |
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9
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data: ReturnType<BeanFunction>, |
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expiration: number, |
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} |
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12
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13
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15 |
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const createKey = (obj: any) => createHash('sha224') |
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.update(JSON.stringify(obj)) |
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15
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.digest('hex'); |
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9 |
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const getCachedData = (cache: Map<string, CacheEntry>, key: string) => { |
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15 |
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const cached = cache.get(key); |
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if (!cached) { |
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8 |
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throw new Error(`Key ${key} not found in cache`); |
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} |
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22
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7 |
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if (cached.expiration < Date.now()) { |
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23
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1 |
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cache.delete(key); |
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1 |
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throw new Error(`Key ${key} expired in cache`); |
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} |
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return cached; |
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}; |
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29
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9 |
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const isRoute = (args: unknown[]): args is [Request, Response] => { |
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30
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15 |
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if (args.length !== 2) { |
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return false; |
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} |
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2 |
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const potentialReq = args[0] as any; |
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2 |
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const potentialRes = args[1] as any; |
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36
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2 |
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return ( |
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potentialReq && |
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typeof potentialReq === 'object' && |
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39
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'url' in potentialReq && |
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40
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'method' in potentialReq && |
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'params' in potentialReq && |
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42
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'query' in potentialReq && |
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potentialRes && |
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typeof potentialRes === 'object' && |
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45
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'send' in potentialRes && |
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46
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'json' in potentialRes |
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47
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); |
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48
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}; |
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49
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50
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/** |
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51
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* Caches the result of a method |
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52
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* or the response of a route handler using Response.send |
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53
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* @param options {Cache} |
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54
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* @decorator |
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55
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*/ |
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56
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9 |
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export function Cached<This>( |
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57
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options: Cache = { duration: 60_000, type: 'memory' }, |
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) { |
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59
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6 |
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return ( |
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60
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method: BeanFunction, |
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61
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context: ClassMethodDecoratorContext<This, BeanFunction>, |
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62
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) => { |
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63
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6 |
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logger.debug(`Initializing cache for method ${String(context.name)}`); |
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64
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65
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6 |
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const cache = new Map<string, CacheEntry>(); |
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66
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6 |
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Executor.setExecution('init', () => { |
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67
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16 |
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const bean = registeredMethods.get(method); |
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68
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16 |
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bean?._interceptors.set(context.name as string, (target: any, _prop: string) => { |
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69
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70
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15 |
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return (...args: any[]) => { |
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71
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15 |
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let keyObj: any = { args }; |
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72
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15 |
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if (isRoute(args)) { |
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73
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2 |
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const [req, res] = args; |
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74
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2 |
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keyObj = { |
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75
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url: req.url, |
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76
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method: req.method, |
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77
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params: req.params, |
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query: req.query, |
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79
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body: req.body, |
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80
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}; |
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81
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2 |
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const key = createKey(keyObj); |
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82
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2 |
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try { |
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83
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2 |
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const result = getCachedData(cache, key); |
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84
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1 |
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logger.debug(`Returning cached data for ${key}`); |
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85
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1 |
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return res.send(result.data); |
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86
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} catch (error) { |
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87
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1 |
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logger.debug(error); |
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88
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89
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1 |
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const originalSend = res.send.bind(res); |
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90
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1 |
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res.send = function (body: any) { |
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91
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1 |
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cache.set(key, { |
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92
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data: body, |
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93
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expiration: Date.now() + options.duration, |
|
94
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}); |
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95
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1 |
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return originalSend(body); |
|
96
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}; |
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97
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98
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1 |
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return method.call(target, ...args); |
|
99
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} |
|
100
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} else { |
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101
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13 |
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const key = createKey(keyObj); |
|
102
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13 |
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try { |
|
103
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13 |
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const cached = getCachedData(cache, key); |
|
104
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5 |
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logger.debug(`Cache hit for method ${String(context.name)} with key ${key}`); |
|
105
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5 |
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return cached.data; |
|
106
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} catch { |
|
107
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8 |
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logger.debug(`Cache miss for method ${String(context.name)} with key ${key}`); |
|
108
|
8 |
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const result = method.apply(target, args); |
|
109
|
8 |
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cache.set(key, { |
|
110
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data: result, |
|
111
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expiration: Date.now() + options.duration, |
|
112
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}); |
|
113
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8 |
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return result; |
|
114
|
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} |
|
115
|
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} |
|
116
|
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}; |
|
117
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118
|
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119
|
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}); |
|
120
|
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}); |
|
121
|
6 |
|
return method; |
|
122
|
|
|
}; |
|
123
|
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} |
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124
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spaghiajoeojo /
express-beans
