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bcce530 | 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 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | import crypto from 'crypto'
import { redisGet, redisSet } from './redis'
import { getRedis } from './redis'
const CACHE_TTL = 1 * 60 * 60 // 1 hour in seconds (reduced from 7 days)
const CACHE_PREFIX = 'cache:prompt:'
interface CachedResponse {
response: string
model: string
timestamp: number
promptId: string
}
/**
* Generate cache key from prompt inputs
* Uses SHA256 hash of: promptId + sorted inputs + model
*/
export function generateCacheKey(
promptId: string,
inputs: Record<string, unknown>,
model: string
): string {
// Sort inputs by key for consistent hashing
const sortedInputs = Object.keys(inputs)
.sort()
.reduce((acc, key) => {
acc[key] = inputs[key]
return acc
}, {} as Record<string, unknown>)
const data = JSON.stringify({
promptId,
inputs: sortedInputs,
model,
})
const hash = crypto.createHash('sha256').update(data).digest('hex')
return `${CACHE_PREFIX}${hash}`
}
/**
* Get cached AI response if available
*/
export async function getCachedResponse(
promptId: string,
inputs: Record<string, unknown>,
model: string
): Promise<string | null> {
const key = generateCacheKey(promptId, inputs, model)
// Check if cache has been invalidated via version key
const client = getRedis()
if (client) {
const versionKey = `cache:version:${promptId}`
const invalidatedAt = await client.get<string>(versionKey)
if (invalidatedAt) {
const cached = await redisGet<CachedResponse>(key)
// If the cached entry is older than the invalidation, skip it
if (cached && cached.timestamp < parseInt(invalidatedAt)) {
return null
}
}
}
const cached = await redisGet<CachedResponse>(key)
if (!cached) {
return null
}
// Verify the cached data is for the correct prompt/model
if (cached.promptId !== promptId || cached.model !== model) {
return null
}
return cached.response
}
/**
* Store AI response in cache
*/
export async function cacheResponse(
promptId: string,
inputs: Record<string, unknown>,
model: string,
response: string
): Promise<boolean> {
const key = generateCacheKey(promptId, inputs, model)
const data: CachedResponse = {
response,
model,
timestamp: Date.now(),
promptId,
}
return await redisSet(key, data, CACHE_TTL)
}
/**
* Invalidate all cached responses for a prompt.
* Uses a prompt-specific version key to effectively invalidate all entries.
*/
export async function invalidatePromptCache(promptId: string): Promise<void> {
const client = getRedis()
if (!client) return
try {
// Set a version key for this prompt — any cached entries with an older
// version will be considered stale
const versionKey = `cache:version:${promptId}`
await client.set(versionKey, Date.now().toString())
} catch (error) {
console.error('Cache invalidation error:', error)
}
}
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