fix: 朗读时翻页防止重复发送请求

app/src/main/java/io/legado/app/service/HttpReadAloudService.kt

@@ -12,11 +12,18 @@ import io.legado.app.service.help.ReadAloud
 import io.legado.app.service.help.ReadBook
 import io.legado.app.utils.FileUtils
 import io.legado.app.utils.LogUtils
+import io.legado.app.utils.MD5Utils
 import io.legado.app.utils.postEvent
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import org.jetbrains.anko.collections.forEachWithIndex
 import java.io.File
 import java.io.FileDescriptor
 import java.io.FileInputStream
+import java.net.ConnectException
+import java.net.SocketTimeoutException
+import java.util.*
 
 class HttpReadAloudService : BaseReadAloudService(),
     MediaPlayer.OnPreparedListener,
@@ -55,12 +62,17 @@ class HttpReadAloudService : BaseReadAloudService(),
 
     override fun play() {
         if (contentList.isEmpty()) return
-        if (nowSpeak == 0) {
-            downloadAudio()
-        } else {
-            val file = getSpeakFile(nowSpeak)
-            if (file.exists()) {
-                playAudio(FileInputStream(file).fd)
+        ReadAloud.httpTTS?.let {
+            val fileName = md5SpeakFileName(it.url, AppConfig.ttsSpeechRate.toString(), contentList[nowSpeak])
+            if (nowSpeak == 0) {
+                downloadAudio()
+            } else {
+                val file = getSpeakFileAsMd5(fileName)
+                if (file.exists()) {
+                    playAudio(FileInputStream(file).fd)
+                } else {
+                    downloadAudio()
+                }
             }
         }
     }
@@ -68,28 +80,54 @@ class HttpReadAloudService : BaseReadAloudService(),
     private fun downloadAudio() {
         task?.cancel()
         task = execute {
-            FileUtils.deleteFile(ttsFolder)
-            for (index in 0 until contentList.size) {
-                if (isActive) {
-                    ReadAloud.httpTTS?.let {
-                        AnalyzeUrl(
-                            it.url,
-                            speakText = contentList[index],
-                            speakSpeed = AppConfig.ttsSpeechRate
-                        ).getByteArray().let { bytes ->
-                            if (isActive) {
-                                val file = getSpeakFile(index)
-                                file.writeBytes(bytes)
-                                if (index == nowSpeak) {
-                                    @Suppress("BlockingMethodInNonBlockingContext")
-                                    val fis = FileInputStream(file)
-                                    playAudio(fis.fd)
+            removeCacheFile()
+            ReadAloud.httpTTS?.let {
+                contentList.forEachWithIndex { index, item ->
+                    if (isActive) {
+                        val fileName =
+                            md5SpeakFileName(it.url, AppConfig.ttsSpeechRate.toString(), item)
+
+                        if (hasSpeakFile(fileName)) { //已经下载好的语音缓存
+                            if (index == nowSpeak) {
+                                val file = getSpeakFileAsMd5(fileName)
+
+                                @Suppress("BlockingMethodInNonBlockingContext")
+                                val fis = FileInputStream(file)
+                                playAudio(fis.fd)
+                            }
+                        } else if (hasSpeakCacheFile(fileName)) { //缓存文件还在，可能还没下载完
+                            return@let
+                        } else { //没有下载并且没有缓存文件
+                            try {
+                                createSpeakCacheFile(fileName)
+                                AnalyzeUrl(
+                                    it.url,
+                                    speakText = item,
+                                    speakSpeed = AppConfig.ttsSpeechRate
+                                ).getByteArray().let { bytes ->
+                                    if (isActive) {
+                                        val file = getSpeakFileAsMd5(fileName)
+                                        //val file = getSpeakFile(index)
+                                        file.writeBytes(bytes)
+
+                                        if (index == nowSpeak) {
+                                            @Suppress("BlockingMethodInNonBlockingContext")
+                                            val fis = FileInputStream(file)
+                                            playAudio(fis.fd)
+                                        }
+                                    }
                                 }
+                            } catch (e: SocketTimeoutException) {
+                                removeSpeakCacheFile(fileName)
+                                // delay(2000)
+                                // downloadAudio()
+                            } catch (e: ConnectException) {
+                                removeSpeakCacheFile(fileName)
+                            } catch (e: Exception) {
+                                removeSpeakCacheFile(fileName)
                             }
                         }
                     }
-                } else {
-                    break
                 }
             }
         }
@@ -110,10 +148,47 @@ class HttpReadAloudService : BaseReadAloudService(),
         }
     }
 
-    private fun getSpeakFile(index: Int = nowSpeak): File {
-        return FileUtils.createFileIfNotExist("${ttsFolder}${File.separator}${index}.mp3")
+    private fun speakFilePath() = ttsFolder + File.separator
+    private fun md5SpeakFileName(url: String, ttsConfig: String, content: String): String {
+        return MD5Utils.md5Encode16(textChapter!!.title) + "_" + MD5Utils.md5Encode16("$url-|-$ttsConfig-|-$content")
+    }
+
+    private fun hasSpeakFile(name: String) =
+        FileUtils.exist("${speakFilePath()}$name.mp3")
+
+    private fun hasSpeakCacheFile(name: String) =
+        FileUtils.exist("${speakFilePath()}$name.mp3.cache")
+
+    private fun createSpeakCacheFile(name: String): File =
+        FileUtils.createFileWithReplace("${speakFilePath()}$name.mp3.cache")
+
+    private fun removeSpeakCacheFile(name: String) {
+        FileUtils.delete("${speakFilePath()}$name.mp3.cache")
+    }
+
+    private fun getSpeakFileAsMd5(name: String): File =
+        FileUtils.createFileIfNotExist("${speakFilePath()}$name.mp3")
+
+    private fun removeCacheFile() {
+        FileUtils.listDirsAndFiles(speakFilePath())?.forEach {
+            if (it == null) {
+                return@forEach
+            }
+            if (Regex(""".+\.mp3$""").matches(it.name)) { //mp3缓存文件
+                val reg =
+                    """^${MD5Utils.md5Encode16(textChapter!!.title)}_[a-z0-9]{16}\.mp3$""".toRegex()
+                if (!reg.matches(it.name)) {
+                    FileUtils.deleteFile(it.absolutePath)
+                }
+            } else {
+                if (Date().time - it.lastModified() > 30000) {
+                    FileUtils.deleteFile(it.absolutePath)
+                }
+            }
+        }
     }
 
+
     override fun pauseReadAloud(pause: Boolean) {
         super.pauseReadAloud(pause)
         mediaPlayer.pause()