260 lines
15 KiB
Markdown
260 lines
15 KiB
Markdown
# TDLight
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TDLight is a fork of tdlib, focused on memory footprint and performance.
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TDLight is 100% compatible with tdlib, if you don't use the sqlite database.
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⚠️ Memory Cleanup remove nearly every cached value, so you must use it with caution!
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This function is not suggested for GUI clients, because they heavily rely on retrieving cached data!
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TDLib developers strongly advise against the use of this feature, since it is not an intended behavior.
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## Added features
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### Memory cleanup
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TDLight can clean itself and release some ram to the OS if you want. Look at **TdApi.OptimizeMemory** in "Modified features" paragraph to see how.
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### Constant memory usage without restarting
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TDLight, if used with care, doesn't grow in memory usage with time. Look at **TdApi.OptimizeMemory** in "Modified features" paragraph to see how
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### Custom options
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We added some options:
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* **disable_minithumbnails** (true/**false**) This setting removes minithumbnails everywhere. It reduces memory usage because tdlib keeps them in RAM
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* **disable_document_filenames** (true/**false**) If you don't care about having the original filenames of every file stored in RAM, you can disable them using this option. It reduces memory usage
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* **disable_notifications** (true/**false**) In TDLib pending notification updates are stored in ram until you "read" them. This option disables completely notifications and keeps the pending notifications queue empty, reducing memory usage
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* **ignore_update_chat_last_message** (true/**false**) If you don't care about have updateChatLastMessage updates enable this
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* **ignore_update_chat_read_inbox** (true/**false**) If you don't care about have updateChatReadInbox updates enable this
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* **ignore_update_user_chat_action** (true/**false**) If you don't care about have updateUserChatAction updates enable this
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* **ignore_server_deletes_and_reads** (true/**false**) If you don't care about receiving read receipts and remote deletes from other users, enable this, it will reduce memory usage
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* **delete_chat_reference_after_seconds** (positive number) During cleanup, free the memory of the chats that have not been touched for more than X seconds
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* **delete_user_reference_after_seconds** (positive number) During cleanup, free the memory of the users that have not been touched for more than X seconds
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* **delete_file_reference_after_seconds** (positive number) During cleanup, free the memory of the files that have not been touched for more than X seconds
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* **experiment_enable_file_reference_cleanup** (**true**/false) During cleanup, free the memory of the file references
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* **experiment_enable_chat_access_hash_cleanup** (**true**/false) During cleanup, clean chats and channels access hash
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* **enable_pull_based_backpressure** (true/**false**) Enable manual `get_channel_difference` execution by calling `getChannelDifference(channel_difference_id)`.
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Don't modify this option unless you have a very large bot that struggles to keep up with start-up updates throughput, or you want to implement a pull-based async library.
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## Custom API functions
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### TdApi.OptimizeMemory
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This method is used to optimize the memory usage, but it must be used carefully.
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It removes almost all cached values and releases the memory back to the OS.
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You can call TdApi.OptimizeMemory normally, but removing cached values
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can cause problems if you don't take some precautions.
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If you want to avoid receiving data with missing fields during cleanup:
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1. Before calling *TdApi.OptimizeMemory* you must:
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1. Read all the pending updates to empty the pending updates queue.
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2. Disable internet connection using *TdApi.SetNetworkType(TdApi.NetworkTypeNone)*
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2. Call *TdApi.OptimizeMemory*
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3. After calling *TdApi.OptimizeMemory* you must:
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1. **NOT** use the old file ids because they have been deleted! (Example: If you receive the file 12 after OptimizeMemory is not the same file 12 that you received before *TdApi.OptimizeMemory*, because the id 12 has been reused)
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2. Re-enable internet connection using *TdApi.SetNetworkType(TdApi.NetworkTypeOther)*
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### TdApi.GetMemoryStatistics
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This method is used to read the size of all the biggest data maps inside tdlib implementation.
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The output contains a string that can be parsed as a JSON.
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## Other reccomended options
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* Options:
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* ignore_inline_thumbnails: true
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* disable_top_chats: true
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* ignore_platform_restrictions: true
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* ignore_sensitive_content_restrictions: true
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* Disable all the databases (messages_db, users_db, files_db)
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⚠️ If you use the databases, TDLight memory cleanup feature will be automatically disabled, because databases will lose some data when cleaning up the memory.
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-----
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The following text is the classic tdlib readme:
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# TDLib
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TDLib (Telegram Database library) is a cross-platform library for building [Telegram](https://telegram.org) clients. It can be easily used from almost any programming language.
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## Table of Contents
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- [Features](#features)
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- [Examples and documentation](#usage)
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- [Dependencies](#dependencies)
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- [Building](#building)
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- [Installing dependencies](#installing-dependencies)
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- [Using in CMake C++ projects](#using-cxx)
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- [Using in Java projects](#using-java)
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- [Using in .NET projects](#using-dotnet)
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- [Using with other programming languages](#using-json)
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- [License](#license)
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<a name="features"></a>
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## Features
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`TDLib` has many advantages. Notably `TDLib` is:
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* **Cross-platform**: `TDLib` can be used on Android, iOS, Windows, macOS, Linux, FreeBSD, OpenBSD, NetBSD, illumos, Windows Phone, WebAssembly, watchOS, tvOS, Tizen, Cygwin. It should also work on other *nix systems with or without minimal effort.
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* **Multilanguage**: `TDLib` can be easily used with any programming language that is able to execute C functions. Additionally it already has native Java (using `JNI`) bindings and .NET (using `C++/CLI` and `C++/CX`) bindings.
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* **Easy to use**: `TDLib` takes care of all network implementation details, encryption and local data storage.
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* **High-performance**: in the [Telegram Bot API](https://core.telegram.org/bots/api), each `TDLib` instance handles more than 24000 active bots simultaneously.
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* **Well-documented**: all `TDLib` API methods and public interfaces are fully documented.
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* **Consistent**: `TDLib` guarantees that all updates are delivered in the right order.
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* **Reliable**: `TDLib` remains stable on slow and unreliable Internet connections.
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* **Secure**: all local data is encrypted using a user-provided encryption key.
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* **Fully-asynchronous**: requests to `TDLib` don't block each other or anything else, responses are sent when they are available.
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<a name="usage"></a>
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## Examples and documentation
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See our [Getting Started](https://core.telegram.org/tdlib/getting-started) tutorial for a description of basic TDLib concepts.
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Take a look at our [examples](https://github.com/tdlib/td/blob/master/example/README.md#tdlib-usage-and-build-examples).
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See a [TDLib build instructions generator](https://tdlib.github.io/td/build.html) for detailed instructions on how to build TDLib.
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See description of our [JSON](#using-json), [C++](#using-cxx), [Java](#using-java) and [.NET](#using-dotnet) interfaces.
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See the [td_api.tl](https://github.com/tdlib/td/blob/master/td/generate/scheme/td_api.tl) scheme or the automatically generated [HTML documentation](https://core.telegram.org/tdlib/docs/td__api_8h.html)
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for a list of all available `TDLib` [methods](https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_function.html) and [classes](https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_object.html).
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<a name="dependencies"></a>
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## Dependencies
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`TDLib` depends on:
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* C++14 compatible compiler (Clang 3.4+, GCC 4.9+, MSVC 19.0+ (Visual Studio 2015+), Intel C++ Compiler 17+)
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* OpenSSL
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* zlib
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* gperf (build only)
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* CMake (3.0.2+, build only)
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* PHP (optional, for documentation generation)
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<a name="building"></a>
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## Building
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The simplest way to build `TDLib` is to use our [TDLib build instructions generator](https://tdlib.github.io/td/build.html).
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You need only to choose your programming language and target operating system to receive complete build instructions.
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In general, you need to install all `TDLib` [dependencies](#dependencies) as described in [Installing dependencies](#installing-dependencies).
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Then enter directory containing `TDLib` sources and compile them using CMake:
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```
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mkdir build
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cd build
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cmake -DCMAKE_BUILD_TYPE=Release ..
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cmake --build .
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```
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To build `TDLib` on low memory devices you can run [SplitSource.php](https://github.com/tdlib/td/blob/master/SplitSource.php) script
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before compiling main `TDLib` source code and compile only needed targets:
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```
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mkdir build
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cd build
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cmake -DCMAKE_BUILD_TYPE=Release ..
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cmake --build . --target prepare_cross_compiling
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cd ..
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php SplitSource.php
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cd build
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cmake --build . --target tdjson
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cmake --build . --target tdjson_static
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cd ..
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php SplitSource.php --undo
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```
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In our tests clang 6.0 with libc++ required less than 500 MB of RAM per file and GCC 4.9/6.3 used less than 1 GB of RAM per file.
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<a name="installing-dependencies"></a>
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### Installing dependencies
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<a name="macos"></a>
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#### macOS
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* Install the latest Xcode command line tools, for example, via `xcode-select --install`.
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* Install other [dependencies](#dependencies), for example, using [Homebrew](https://brew.sh):
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```
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brew install gperf cmake openssl
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```
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* Build `TDLib` with CMake as explained in [building](#building). You will likely need to manually specify path to the installed OpenSSL to CMake, e.g.,
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```
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cmake -DCMAKE_BUILD_TYPE=Release -DOPENSSL_ROOT_DIR=/usr/local/opt/openssl/ ..
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```
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<a name="windows"></a>
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#### Windows
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* Download and install Microsoft Visual Studio 2015 or later.
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* Download and install [gperf](https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/). Add the path to gperf.exe to the PATH environment variable.
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* Install [vcpkg](https://github.com/Microsoft/vcpkg#quick-start).
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* Run the following commands to install `TDLib` dependencies using vcpkg:
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```
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cd <path to vcpkg>
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.\vcpkg.exe install openssl:x64-windows openssl:x86-windows zlib:x64-windows zlib:x86-windows
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```
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* Download and install [CMake](https://cmake.org/download/); choose "Add CMake to the system PATH" option while installing.
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* Build `TDLib` with CMake as explained in [building](#building), but instead of `cmake -DCMAKE_BUILD_TYPE=Release ..` use
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```
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cmake -DCMAKE_TOOLCHAIN_FILE=<path to vcpkg>/scripts/buildsystems/vcpkg.cmake ..
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```
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To build 32-bit/64-bit `TDLib` using MSVC, you will need to additionally specify parameter `-A Win32`/`-A x64` to CMake.
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To build `TDLib` in Release mode using MSVC, you will need to additionally specify parameter `--config Release` to the `cmake --build .` command.
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<a name="linux"></a>
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#### Linux
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* Install all [dependencies](#dependencies) using your package manager.
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<a name="using-cxx"></a>
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## Using in CMake C++ projects
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For C++ projects that use CMake, the best approach is to build `TDLib` as part of your project or to install it system-wide.
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There are several libraries that you could use in your CMake project:
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* Td::TdJson, Td::TdJsonStatic — dynamic and static version of a JSON interface. This has a simple C interface, so it can be easily used with any programming language that is able to execute C functions.
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See [td_json_client](https://core.telegram.org/tdlib/docs/td__json__client_8h.html) and [td_log](https://core.telegram.org/tdlib/docs/td__log_8h.html) documentation for more information.
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* Td::TdStatic — static library with C++ interface for general usage.
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See [Client](https://core.telegram.org/tdlib/docs/classtd_1_1_client.html) and [Log](https://core.telegram.org/tdlib/docs/classtd_1_1_log.html) documentation for more information.
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* Td::TdCoreStatic — static library with low-level C++ interface intended mostly for internal usage.
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See [ClientActor](https://core.telegram.org/tdlib/docs/classtd_1_1_client_actor.html) and [Log](https://core.telegram.org/tdlib/docs/classtd_1_1_log.html) documentation for more information.
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For example, part of your CMakeLists.txt may look like this:
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```
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add_subdirectory(td)
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target_link_libraries(YourTarget PRIVATE Td::TdStatic)
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```
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Or you could install `TDLib` and then reference it in your CMakeLists.txt like this:
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```
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find_package(Td 1.7.6 REQUIRED)
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target_link_libraries(YourTarget PRIVATE Td::TdStatic)
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```
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See [example/cpp/CMakeLists.txt](https://github.com/tdlib/td/tree/master/example/cpp/CMakeLists.txt).
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<a name="using-java"></a>
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## Using in Java projects
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`TDLib` provides native Java interface through JNI. To enable it, specify option `-DTD_ENABLE_JNI=ON` to CMake.
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See [example/java](https://github.com/tdlib/td/tree/master/example/java) for example of using `TDLib` from Java and detailed build and usage instructions.
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<a name="using-dotnet"></a>
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## Using in .NET projects
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`TDLib` provides native .NET interface through `C++/CLI` and `C++/CX`. To enable it, specify option `-DTD_ENABLE_DOTNET=ON` to CMake.
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.NET Core supports `C++/CLI` only since version 3.1 and only on Windows, so if older .NET Core is used or portability is needed, then `TDLib` JSON interface should be used through P/Invoke instead.
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See [example/csharp](https://github.com/tdlib/td/tree/master/example/csharp) for example of using `TDLib` from C# and detailed build and usage instructions.
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See [example/uwp](https://github.com/tdlib/td/tree/master/example/uwp) for example of using `TDLib` from C# UWP application and detailed build and usage instructions for Visual Studio Extension "TDLib for Universal Windows Platform".
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When `TDLib` is built with `TD_ENABLE_DOTNET` option enabled, `C++` documentation is removed from some files. You need to checkout these files to return `C++` documentation back:
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```
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git checkout td/telegram/Client.h td/telegram/Log.h td/tl/TlObject.h
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```
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<a name="using-json"></a>
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## Using from other programming languages
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`TDLib` provides efficient native C++, Java, and .NET interfaces.
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But for most use cases we suggest to use the JSON interface, which can be easily used with any programming language that is able to execute C functions.
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See [td_json_client](https://core.telegram.org/tdlib/docs/td__json__client_8h.html) and [td_log](https://core.telegram.org/tdlib/docs/td__log_8h.html) documentation for detailed JSON interface description,
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the [td_api.tl](https://github.com/tdlib/td/blob/master/td/generate/scheme/td_api.tl) scheme or the automatically generated [HTML documentation](https://core.telegram.org/tdlib/docs/td__api_8h.html) for a list of
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all available `TDLib` [methods](https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_function.html) and [classes](https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1_object.html).
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`TDLib` JSON interface adheres to semantic versioning and versions with the same major version number are binary and backward compatible, but the underlying `TDLib` API can be different for different minor and even patch versions.
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If you need to support different `TDLib` versions, then you can use a value of the `version` option to find exact `TDLib` version to use appropriate API methods.
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See [example/python/tdjson_example.py](https://github.com/tdlib/td/tree/master/example/python/tdjson_example.py) for an example of such usage.
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<a name="license"></a>
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## License
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`TDLib` is licensed under the terms of the Boost Software License. See [LICENSE_1_0.txt](http://www.boost.org/LICENSE_1_0.txt) for more information.
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