Replace cover search with streaming version

server/managers/CoverSearchManager.js

@@ -0,0 +1,248 @@
+const { setMaxListeners } = require('events')
+const Logger = require('../Logger')
+const BookFinder = require('../finders/BookFinder')
+const PodcastFinder = require('../finders/PodcastFinder')
+
+/**
+ * Manager for handling streaming cover search across multiple providers
+ */
+class CoverSearchManager {
+  constructor() {
+    /** @type {Map<string, AbortController>} Map of requestId to AbortController */
+    this.activeSearches = new Map()
+
+    // Default timeout for each provider search
+    this.providerTimeout = 10000 // 10 seconds
+
+    // Set to 0 to disable the max listeners limit
+    // We need one listener per provider (15+) and may have multiple concurrent searches
+    this.maxListeners = 0
+  }
+
+  /**
+   * Start a streaming cover search
+   * @param {string} requestId - Unique identifier for this search request
+   * @param {Object} searchParams - Search parameters
+   * @param {string} searchParams.title - Title to search for
+   * @param {string} searchParams.author - Author to search for (optional)
+   * @param {string} searchParams.provider - Provider to search (or 'all')
+   * @param {boolean} searchParams.podcast - Whether this is a podcast search
+   * @param {Function} onResult - Callback for each result chunk
+   * @param {Function} onComplete - Callback when search completes
+   * @param {Function} onError - Callback for errors
+   */
+  async startSearch(requestId, searchParams, onResult, onComplete, onError) {
+    if (this.activeSearches.has(requestId)) {
+      Logger.warn(`[CoverSearchManager] Search with requestId ${requestId} already exists`)
+      return
+    }
+
+    const abortController = new AbortController()
+
+    // Increase max listeners on this signal to accommodate parallel provider searches
+    // AbortSignal is an EventTarget, so we use the events module's setMaxListeners
+    setMaxListeners(this.maxListeners, abortController.signal)
+
+    this.activeSearches.set(requestId, abortController)
+
+    Logger.info(`[CoverSearchManager] Starting search ${requestId} with params:`, searchParams)
+
+    try {
+      const { title, author, provider, podcast } = searchParams
+
+      if (podcast) {
+        await this.searchPodcastCovers(requestId, title, abortController.signal, onResult, onError)
+      } else {
+        await this.searchBookCovers(requestId, provider, title, author, abortController.signal, onResult, onError)
+      }
+
+      if (!abortController.signal.aborted) {
+        onComplete()
+      }
+    } catch (error) {
+      if (error.name === 'AbortError') {
+        Logger.info(`[CoverSearchManager] Search ${requestId} was cancelled`)
+      } else {
+        Logger.error(`[CoverSearchManager] Search ${requestId} failed:`, error)
+        onError(error.message)
+      }
+    } finally {
+      this.activeSearches.delete(requestId)
+    }
+  }
+
+  /**
+   * Cancel an active search
+   * @param {string} requestId - Request ID to cancel
+   */
+  cancelSearch(requestId) {
+    const abortController = this.activeSearches.get(requestId)
+    if (abortController) {
+      Logger.info(`[CoverSearchManager] Cancelling search ${requestId}`)
+      abortController.abort()
+      this.activeSearches.delete(requestId)
+      return true
+    }
+    return false
+  }
+
+  /**
+   * Search for podcast covers
+   */
+  async searchPodcastCovers(requestId, title, signal, onResult, onError) {
+    try {
+      const results = await this.executeWithTimeout(() => PodcastFinder.findCovers(title), this.providerTimeout, signal)
+
+      if (signal.aborted) return
+
+      const covers = this.extractCoversFromResults(results)
+      if (covers.length > 0) {
+        onResult({
+          provider: 'itunes',
+          covers,
+          total: covers.length
+        })
+      }
+    } catch (error) {
+      if (error.name !== 'AbortError') {
+        Logger.error(`[CoverSearchManager] Podcast search failed:`, error)
+        onError('itunes', error.message)
+      }
+    }
+  }
+
+  /**
+   * Search for book covers across providers
+   */
+  async searchBookCovers(requestId, provider, title, author, signal, onResult, onError) {
+    let providers = []
+
+    if (provider === 'all') {
+      providers = [...BookFinder.providers]
+    } else {
+      providers = [provider]
+    }
+
+    Logger.debug(`[CoverSearchManager] Searching ${providers.length} providers in parallel`)
+
+    // Search all providers in parallel
+    const searchPromises = providers.map(async (providerName) => {
+      if (signal.aborted) return
+
+      try {
+        const searchResults = await this.executeWithTimeout(() => BookFinder.search(null, providerName, title, author || ''), this.providerTimeout, signal)
+
+        if (signal.aborted) return
+
+        const covers = this.extractCoversFromResults(searchResults)
+
+        Logger.debug(`[CoverSearchManager] Found ${covers.length} covers from ${providerName}`)
+
+        if (covers.length > 0) {
+          onResult({
+            provider: providerName,
+            covers,
+            total: covers.length
+          })
+        }
+      } catch (error) {
+        if (error.name !== 'AbortError') {
+          Logger.warn(`[CoverSearchManager] Provider ${providerName} failed:`, error.message)
+          onError(providerName, error.message)
+        }
+      }
+    })
+
+    await Promise.allSettled(searchPromises)
+  }
+
+  /**
+   * Execute a promise with timeout and abort signal
+   */
+  async executeWithTimeout(fn, timeout, signal) {
+    return new Promise(async (resolve, reject) => {
+      let abortHandler = null
+      let timeoutId = null
+
+      // Cleanup function to ensure we always remove listeners
+      const cleanup = () => {
+        if (timeoutId) {
+          clearTimeout(timeoutId)
+          timeoutId = null
+        }
+        if (abortHandler) {
+          signal.removeEventListener('abort', abortHandler)
+          abortHandler = null
+        }
+      }
+
+      // Set up timeout
+      timeoutId = setTimeout(() => {
+        cleanup()
+        const error = new Error('Provider timeout')
+        error.name = 'TimeoutError'
+        reject(error)
+      }, timeout)
+
+      // Check if already aborted
+      if (signal.aborted) {
+        cleanup()
+        const error = new Error('Search cancelled')
+        error.name = 'AbortError'
+        reject(error)
+        return
+      }
+
+      // Set up abort handler
+      abortHandler = () => {
+        cleanup()
+        const error = new Error('Search cancelled')
+        error.name = 'AbortError'
+        reject(error)
+      }
+      signal.addEventListener('abort', abortHandler)
+
+      try {
+        const result = await fn()
+        cleanup()
+        resolve(result)
+      } catch (error) {
+        cleanup()
+        reject(error)
+      }
+    })
+  }
+
+  /**
+   * Extract cover URLs from search results
+   */
+  extractCoversFromResults(results) {
+    const covers = []
+    if (!Array.isArray(results)) return covers
+
+    results.forEach((result) => {
+      if (result.covers && Array.isArray(result.covers)) {
+        covers.push(...result.covers)
+      }
+      if (result.cover) {
+        covers.push(result.cover)
+      }
+    })
+
+    // Remove duplicates
+    return [...new Set(covers)]
+  }
+
+  /**
+   * Cancel all active searches (cleanup on server shutdown)
+   */
+  cancelAllSearches() {
+    Logger.info(`[CoverSearchManager] Cancelling ${this.activeSearches.size} active searches`)
+    for (const [requestId, abortController] of this.activeSearches.entries()) {
+      abortController.abort()
+    }
+    this.activeSearches.clear()
+  }
+}
+
+module.exports = new CoverSearchManager()