373 lines
12 KiB
TypeScript
373 lines
12 KiB
TypeScript
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/**
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* visionAnalyzer.ts
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*
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* Vision analysis for media content — prepares media messages for the
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* moderation pipeline, runs single-image vision LLM analysis with
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* multi-layer caching, and detects whether a message has media content.
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*/
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import { createChildLogger } from "@bete/shared/logger";
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import { delay } from "@bete/shared/utils";
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import { config } from "../../shared/config/config.js";
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import { extractMessageMediaEvidence } from "../message-capture/messageMetadata.js";
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import type {
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AttachmentRecord,
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MessageRecord,
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} from "../message-capture/types.js";
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import { llmVision } from "./llmClient.js";
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import {
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acquireMediaAnalysisLock,
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computeImagePhash,
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deleteCachedMediaAnalysis,
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FAILED_ANALYSIS_PREFIX,
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getCachedMediaAnalysis,
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getCachedMediaByPhash,
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inFlightVisionCalls,
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makeCustomEmojiCacheKey,
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makeImageCacheKey,
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makeStickerCacheKey,
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upsertCachedMediaAnalysis,
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upsertCachedMediaByPhash,
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visionLruCache,
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} from "./mediaCache.js";
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import {
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buildMediaCandidates,
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downloadAndExtractFrame,
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downloadMediaCandidate,
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fetchUrlInline,
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} from "./mediaDownloader.js";
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import {
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buildReferenceXml,
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escapeXml,
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getAnalysisContent,
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} from "./moderationBuilders.js";
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import {
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buildCustomEmojiVisionPrompt,
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buildGeneralImageVisionPrompt,
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buildStickerTextOnlyWarning,
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buildStickerVisionPrompt,
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sanitizeAiContent,
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} from "./moderationPrompt.js";
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import {
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extractSearchQueries,
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formatSearchResults,
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searchSearxng,
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} from "./searxngSearch.js";
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import { extractUrlsFromText } from "./urlFetcher.js";
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import { getUserProfile } from "./userProfileStore.js";
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import { initializeUserReputation } from "./userReputationStore.js";
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// ---------------------------------------------------------------------------
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// Types
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// ---------------------------------------------------------------------------
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export type MessageImagePart = {
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type: "image_url";
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image_url: { url: string };
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sourceLabel: string;
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stickerName?: string;
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customEmojiId?: string;
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customEmojiName?: string;
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};
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export interface PreparedMediaMessage {
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targetId: string;
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messageBlock: string;
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}
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// ---------------------------------------------------------------------------
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// Media detection
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// ---------------------------------------------------------------------------
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export function hasMediaContent(
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target: MessageRecord,
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attachments?: AttachmentRecord[],
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): boolean {
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if (target.metadata) {
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const evidence = extractMessageMediaEvidence(target.metadata);
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if (
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evidence.stickers.length > 0 ||
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evidence.embeds.length > 0 ||
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evidence.attachments.length > 0
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)
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return true;
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}
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if (attachments?.some((a) => a.message_id === target.id)) return true;
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return false;
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}
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// ---------------------------------------------------------------------------
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// Single-image vision analysis
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// ---------------------------------------------------------------------------
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export const analyzeSingleMediaImage = async (
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messageId: string,
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image: MessageImagePart,
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): Promise<string> => {
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const cacheKey = image.customEmojiId
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? makeCustomEmojiCacheKey(image.customEmojiId)
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: image.stickerName
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? makeStickerCacheKey(image.stickerName)
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: makeImageCacheKey(image.image_url.url);
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const log = createChildLogger("mediaAnalysis");
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// Layer 0: LRU
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const lruCached = visionLruCache.get(cacheKey);
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if (lruCached) {
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log.debug({ cacheKey }, "Vision LRU cache HIT (in-memory)");
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return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${lruCached}`;
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}
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// Layer 1: DB
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const cached = await getCachedMediaAnalysis(cacheKey);
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if (cached) {
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visionLruCache.set(cacheKey, cached);
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log.debug({ cacheKey }, "Media analysis cache HIT (DB → LRU)");
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return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${cached}`;
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}
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// In-flight dedupe
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const existing = inFlightVisionCalls.get(cacheKey);
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if (existing) {
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log.debug({ cacheKey }, "Media analysis in-flight dedupe");
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const result = await existing;
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return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${result}`;
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}
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const promptText = image.stickerName
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? buildStickerVisionPrompt(image.stickerName, messageId)
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: image.customEmojiName
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? buildCustomEmojiVisionPrompt(image.customEmojiName, messageId)
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: buildGeneralImageVisionPrompt(image.sourceLabel, messageId);
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const visionPromise = (async (): Promise<string> => {
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// Distributed lock
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const locked = await acquireMediaAnalysisLock(cacheKey, Date.now() + 60000);
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if (!locked) {
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log.debug({ cacheKey }, "Distributed lock — polling");
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for (let i = 0; i < 15; i++) {
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await new Promise((r) => setTimeout(r, 2000));
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const polled = await getCachedMediaAnalysis(cacheKey);
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if (polled) {
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visionLruCache.set(cacheKey, polled);
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return polled;
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}
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}
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log.warn({ cacheKey }, "Distributed lock polling timed out");
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return FAILED_ANALYSIS_PREFIX;
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}
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// phash check
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let phash: string | null = null;
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if (image.image_url.url.startsWith("data:")) {
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try {
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const base64Data = image.image_url.url.split(",")[1];
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if (base64Data) {
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const imgBuffer = Buffer.from(base64Data, "base64");
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phash = await computeImagePhash(imgBuffer);
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if (phash) {
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const phashCached = await getCachedMediaByPhash(phash);
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if (phashCached) {
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visionLruCache.set(cacheKey, phashCached);
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await upsertCachedMediaAnalysis(
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cacheKey,
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phashCached,
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"vision_llm",
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Date.now() + 24 * 60 * 60 * 1000,
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).catch(() => {});
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return phashCached;
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}
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}
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}
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} catch {
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phash = null;
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}
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}
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// Vision API call
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let lastError: Error | null = null;
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for (let attempt = 0; attempt < 3; attempt++) {
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try {
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const content = await llmVision(promptText, image.image_url);
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if (content) {
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await upsertCachedMediaAnalysis(
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cacheKey,
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content,
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"vision_llm",
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Date.now() + 24 * 60 * 60 * 1000,
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);
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visionLruCache.set(cacheKey, content);
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if (phash) {
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upsertCachedMediaByPhash(
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phash,
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content,
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"vision_llm",
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Date.now() + 7 * 24 * 60 * 60 * 1000,
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).catch(() => {});
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}
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return content;
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}
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log.warn({ messageId }, "Vision API null response");
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break;
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} catch (err) {
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lastError = err instanceof Error ? err : new Error(String(err));
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if (attempt < 2) {
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const backoffMs = Math.min(
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2_000 * 3 ** attempt + Math.random() * 500,
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30_000,
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);
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log.warn(
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{
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messageId,
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attempt: attempt + 1,
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backoffMs,
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error: lastError.message,
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},
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"Vision retry",
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);
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await delay(backoffMs);
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}
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}
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}
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log.warn(
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{ messageId, lastError: lastError?.message ?? "null" },
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"Vision failed after 3 attempts",
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);
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await deleteCachedMediaAnalysis(cacheKey).catch(() => {});
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return FAILED_ANALYSIS_PREFIX;
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})();
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inFlightVisionCalls.set(cacheKey, visionPromise);
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try {
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const content = await visionPromise;
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return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${content}`;
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} catch (outerErr) {
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log.error(
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{
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messageId,
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cacheKey,
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error: outerErr instanceof Error ? outerErr.message : String(outerErr),
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},
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"visionPromise threw unexpectedly",
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);
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return `[Media analysis for message ${messageId}] ${image.sourceLabel}: ${FAILED_ANALYSIS_PREFIX}`;
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} finally {
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inFlightVisionCalls.delete(cacheKey);
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}
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};
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// ---------------------------------------------------------------------------
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// Media message preparation
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// ---------------------------------------------------------------------------
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/**
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* Download images, run vision analysis, and build the message XML block
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* for a single media-bearing message. Does NOT make the moderation LLM call.
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*/
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export async function prepareMediaMessage(
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target: MessageRecord,
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allAttachments: AttachmentRecord[] | undefined,
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): Promise<PreparedMediaMessage> {
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const _log = createChildLogger("mediaAnalysis");
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const targetId = target.id;
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const imageMap = new Map<string, MessageImagePart[]>();
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const webTextMap = new Map<string, string[]>();
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const mediaAnalysisMap = new Map<string, string[]>();
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const maxDimension = config.AI_LLM_IMAGE_MAX_DIMENSION ?? 1024;
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const content = getAnalysisContent(target);
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const downloadPromises: Array<Promise<void>> = [];
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// Attachments
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const msgAttachments = (allAttachments ?? [])
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.filter(
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(a) =>
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a.message_id === targetId &&
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(a.uploaded_url ?? a.discord_url ?? null) &&
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(a.type.startsWith("image/") || a.type.startsWith("video/")),
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)
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.slice(0, 8);
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for (const att of msgAttachments) {
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downloadPromises.push(
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downloadAndExtractFrame(att, targetId, maxDimension, imageMap),
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);
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}
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// URLs
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const urls = extractUrlsFromText(content).slice(0, 3);
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const urlWebTexts: string[] = [];
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for (const url of urls) {
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downloadPromises.push(
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fetchUrlInline(url, targetId, maxDimension, imageMap, urlWebTexts),
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);
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}
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// Stickers, embeds, custom emoji
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const mediaEvidence = extractMessageMediaEvidence(target.metadata);
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for (const candidate of buildMediaCandidates(targetId, mediaEvidence)) {
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downloadPromises.push(
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downloadMediaCandidate(
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candidate,
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targetId,
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maxDimension,
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imageMap,
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mediaAnalysisMap,
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),
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);
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}
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await Promise.all(downloadPromises);
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if (urlWebTexts.length > 0) webTextMap.set(targetId, urlWebTexts);
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// Vision analysis
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await Promise.all(
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Array.from(imageMap.entries()).flatMap(([msgId, images]) =>
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images.map(async (image) => {
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const summary = await analyzeSingleMediaImage(msgId, image);
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const existing = mediaAnalysisMap.get(msgId) ?? [];
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existing.push(summary);
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mediaAnalysisMap.set(msgId, existing);
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}),
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),
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);
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// SearXNG
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let searxngXml = "";
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const queries = extractSearchQueries(content);
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if (queries.length > 0) {
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const results = await Promise.allSettled(
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queries.map((q) => searchSearxng(q)),
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);
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const parts: string[] = [];
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for (let i = 0; i < results.length; i++) {
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const r = results[i];
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if (r.status === "fulfilled" && r.value.length > 0)
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parts.push(formatSearchResults(r.value));
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}
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if (parts.length > 0)
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searxngXml = `\n<web_searches>\n${parts.join("\n")}\n</web_searches>`;
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}
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// Build XML block
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const webTexts = webTextMap.get(targetId) ?? [];
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const mediaAnalyses = mediaAnalysisMap.get(targetId) ?? [];
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const webContext = webTexts.length > 0 ? `\n${webTexts.join("\n")}` : "";
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const mediaAnalysisContext =
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mediaAnalyses.length > 0 ? `\n${mediaAnalyses.join("\n")}` : "";
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const mediaContext = [
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mediaEvidence.stickers.length > 0
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? mediaEvidence.stickers
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.map((s) => buildStickerTextOnlyWarning(s.name, s.url))
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.join(" ")
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: null,
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mediaEvidence.embeds.length > 0
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? `[embed evidence: ${mediaEvidence.embeds.map((e) => [e.title, e.description, e.url, e.image, e.thumbnail].filter(Boolean).join(" | ")).join(" || ")}]`
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: null,
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]
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.filter(Boolean)
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.join(" ");
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const rep = await initializeUserReputation(target.user_id, target.guild_id);
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const profile = await getUserProfile(target.user_id);
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const refXml = await buildReferenceXml(target);
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const messageBlock = `<message id="${escapeXml(target.id)}" user="${escapeXml(target.username)}">\n <user_reputation trust_score="${rep.trust_score}" />${profile ? `\n <user_profile>${sanitizeAiContent(profile.profile_summary)}</user_profile>` : ""}${refXml ? `\n ${refXml}` : ""}\n <content>${escapeXml(content)}</content>${mediaContext ? ` ${escapeXml(mediaContext)}` : ""}${webContext}${mediaAnalysisContext}${searxngXml}\n</message>`;
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return { targetId, messageBlock };
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}
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