From b1296f2c97c6fdc1c6a9922dc09c951b5cafdc12 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Mon, 29 Oct 2018 21:49:54 +0100
Subject: Initial commit

---
 include/dchat/Cache.hpp | 102 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 include/dchat/Cache.hpp

(limited to 'include/dchat/Cache.hpp')

diff --git a/include/dchat/Cache.hpp b/include/dchat/Cache.hpp
new file mode 100644
index 0000000..debcd5b
--- /dev/null
+++ b/include/dchat/Cache.hpp
@@ -0,0 +1,102 @@
+#pragma once
+
+#include "types.hpp"
+#include "WebPagePreview.hpp"
+#include "StringView.hpp"
+#include <boost/filesystem/path.hpp>
+#include <string>
+#include <unordered_map>
+#include <thread>
+#include <mutex>
+#include <vector>
+#include <chrono>
+#include <functional>
+
+namespace TinyProcessLib
+{
+    class Process;
+}
+
+namespace dchat
+{
+    class Gif;
+    class WebPagePreview;
+    
+    struct ContentByUrlResult
+    {
+        enum class Type
+        {
+            CACHED,
+            DOWNLOADING,
+            FAILED_DOWNLOAD
+        };
+        
+        enum class CachedType
+        {
+            NONE,
+            TEXTURE_FILEPATH,
+            GIF,
+            WEB_PAGE_PREVIEW
+        };
+        
+        ContentByUrlResult() : textureFilePath(nullptr), type(Type::DOWNLOADING), cachedType(CachedType::NONE) {}
+        ContentByUrlResult(boost::filesystem::path *_textureFilePath, Type _type) : textureFilePath(_textureFilePath), type(_type), cachedType(CachedType::TEXTURE_FILEPATH) {}
+        ContentByUrlResult(Gif *_gif, Type _type) : gif(_gif), type(_type), cachedType(CachedType::GIF) {}
+        ContentByUrlResult(WebPagePreview *_webPagePreview, Type _type) : webPagePreview(_webPagePreview), type(_type), cachedType(CachedType::WEB_PAGE_PREVIEW) {}
+        
+        // @texture is null if @type is DOWNLOADING or FAILED_DOWNLOAD
+        union
+        {
+            boost::filesystem::path *textureFilePath;
+            Gif *gif;
+            WebPagePreview *webPagePreview;
+        };
+        
+        Type type;
+        CachedType cachedType;
+        i64 lastAccessed;
+    };
+
+    using LoadBindsCallbackFunc = std::function<void(const std::string &key, const std::string &value)>;
+    // @fileContent contains data allocated with new[], deallocate it with delete[] fileContent.data;
+    // Returned gif should be allocated with @new
+    using CreateGifFunc = std::function<Gif*(StringView fileContent)>;
+    
+    class Cache
+    {
+    public:
+        // @createGifFunc can't be nullptr
+        Cache(CreateGifFunc createGifFunc);
+        ~Cache();
+        
+        // Creates directory if it doesn't exist (recursively). Throws boost exception on failure
+        static boost::filesystem::path getDchatDir();
+        
+        // Creates directory if it doesn't exist (recursively). Throws boost exception on failure
+        static boost::filesystem::path getImagesDir();
+        
+        // @callbackFunc can't be nullptr
+        static void loadBindsFromFile(LoadBindsCallbackFunc callbackFunc);
+        static void replaceBindsInFile(const std::unordered_map<std::string, std::string> &binds);
+        
+        // Get cached content or download it. 
+        // Default download file limit is 12MB
+        // Returns ContentByUrlResult describing texture status.
+        const ContentByUrlResult getContentByUrl(const std::string &url, int downloadLimitBytes = 12582912);
+    private:
+        struct ImageDownloadInfo
+        {
+            TinyProcessLib::Process *process;
+            std::string url;
+        };
+        
+        std::thread downloadWaitThread;
+        std::thread checkContentAccessTimeThread;
+        std::vector<ImageDownloadInfo> imageDownloadProcesses;
+        std::vector<ImageDownloadInfo> imageDownloadProcessesQueue;
+        std::mutex imageDownloadMutex;
+        bool alive;
+        std::unordered_map<std::string, ContentByUrlResult> contentUrlCache;
+        CreateGifFunc createGifFunc;
+    };
+}
-- 
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