Unity Huatuo example project source code analysis and inspiration

In the last section, we installed huatuo Development environment of , Then run the sample project , Experienced huatuo Make a hot update , In this lesson, we will analyze the source code of the example project , master huatuo The main steps of hot update , Make your own project well based on huatuo To organize hot updates . There are several huatuo The principles should be clear :

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1. Unity ADF Mechanism to sub project , It can be divided into several projects , Avoid a lot of code compiling for a long time , At the same time, heat regeneration can be done according to smaller particle size .
2. In general development , Will be able to Unity The code of the project is passed through IL2CPP All into static binary instruction code , If so IL2CPP_huatuo Loaded a IL Code .dll( both AOT Static code , The corresponding IL Code ),huatuo Priority will be given to explaining the implementation of loading IL Code . Each version puts .dll Generate , compare , Which? .dll Changed , Just use il2cpp_huatuo download , Reprint and execute .
3. Code of any project ( Framework code + The game logic ) Can be based on huatuo To do hot updates .
4. huatuo Provide a hotter mechanism , As for how hot it is , What is hot is completely under your control ;

We take these principles to analyze the source code of the example project and get the inspiration from our own development project .

inspire 1: How to divide the game code into projects and projects

Traditionally, our hot update projects are divided into : Framework code + The game logic . You can also divide according to this standard , You can also continue to divide into smaller particle sizes , Such as game logic , It can be divided into : fighting , Task, etc . So we're using huatuo When doing hot update, the first thing it does is to split the project , Use Unity Of ADF Mechanism , The project is divided into several projects as follows :

Assembly-CSharp.csproj: Default code engineering , The new code will be pulled into this project by default ;

Assembly-CSharp-Editor.csproj: Editor Editor The code will be pulled into this project to compile ;

BetterStreamingAssets.csproj: Resources in the sample project ab Package loading project ;

HotFix.csproj: In the example project, the test project that is more popular ;

HotFix2.csproj: The second test project in the example project ;

Main.csproj: In the example project, the main project of the entrance , The example project starts from the code of the entry project ;

Here is our inspiration , When we are doing our own game projects , You can also use it according to your own project needs Unity ADF Mechanism , To divide the project into several projects , And these projects , It can be generated separately IL Of .dll Code instructions . So you can give IL2CPP_huatuo To explain the implementation . Inspired by this , We use it huatuo When doing projects, I will divide the projects as follows , For your reference :

Assembly-CSharp.csproj: Default code engineering , Put the startup code here , Exothermic update version detection code , What are detected .dll You need to update , Download updates incrementally , Compare which ones don't need to be updated and use the original ones AOT Internal code , What needs to be updated , Need to update with il2cpp_huatuo To load in , Priority is given to the loaded .dll Instructions .

Main.csproj: It can be used for frame engineering , Implement each framework module , Initialization framework , Enter the specific game logic , Provide basic services , Such as SDK Service etc. . This is the traditional hot frame layer , Generally speaking, it's better not to be hot , Use AOT The later code is ok , In case it gets hotter , It can also be directly generated by heat main.dll.

Several business logic projects : Distinguish several game items according to the type of game , These are determined by version comparison .dll Need to be il2cpp_huatuo Virtual machine mount .

inspire 2: Extend the editor to generate all .dll

from huatuo Characteristics of , Which one do you load .dll, You can dynamically interpret and execute the corresponding .dll Code instructions for . So we can get inspiration , Divide everything in our project by Assembly-CSharp.dll Outside of the .dll All come out . such as 1.0 edition : Main.dll( Game framework ), game.dll( The main logic of the game ), task.dll( Mission system ), … such as 2.0 edition : main.dll, game.dll, task.dll, …. So every time you package and publish , We can use this editor to extend , Compile all the projects .dll, And generate an all .dll Of md5 List of file changes . Take the latest one .dll And md5 Put the file list on the server , The local md5 Put the document list in the bag , Each run , We download the latest version incrementally .dll after , We just need to compare the servers .dll md5 File list , Corresponding to the current version .dll Of md5 File list , Decide which .dll Need to load into il2cpp_huatuo, Just load directly to realize hot update , Those that have not changed .dll, Indicates that it can be used directly AOT Machine instructions in mode , No need to explain the implementation IL The directive .dll. Let's take a look at how our sample project compiles .dll The directive , Refer to the extension code of the corresponding editor . Open the Editor/Huatuo The folder EditorHelper.cs, Pictured :

There is nothing to say , call API, pack .dll, direct copy Just come here . According to our analysis above , Yes .dll Generate different versions of .dll md5 The file list needs to be expanded , There is no .

inspire 3: Which part of the code should be hotter , Just load the code

Use huatuo The last thing you need to master to do hot update is , How to load .dll Code for , When we know what the current system needs to be loaded .dll Give Way huatuo Explain after execution , The last step is to let huatuo To load , We can see from the code of this sample project il2cpp_huatuo How to load a .dll Of , When this .dll After being loaded , The functions of this part are explained and implemented .Huatuo How to load code , We can refer to the following examples ( Code from LoadDll.cs):

It is divided into release mode and Edtior Pattern , The release mode is to directly .dll Load in il2cpp_huatuo Of vm in , call API function : System.Reflection.Assembly.Load(.dll Binary contents of ), In the underlying huatuo Made modifications . In Editor Mode , call AppDomain Just load it , So we can refer to this code directly , Compare which .dll Be hotter , I'll just reprint it .