Golang hot update principle

The hot update principle of Go language is mainly implemented through the following four steps: 1. Detect changes in file content by monitoring source code files or specified directories; 2. When files change, use the Go tool chain Rebuild the modified code package or the entire program; 3. Load the new code into the runtime environment by using reflection mechanisms such as plugin packages or reflect; 4. Replace the old code objects with the new code so that they can be immediately Take effect.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In traditional compiled languages, when the code is modified, the program needs to be recompiled and re-run for the modification to take effect. In the Go language, the hot update (Hot Reload) mechanism is adopted, which can load new code changes in real time without stopping and restarting the program.

The hot update principle of Go language is mainly implemented through the following steps:

1. Monitoring file changes:

   Through monitoring Source code files or specified directories, detect changes in file content.

2. Build new code:

   When the file changes, use Go's tool chain (such as the go build command) to rebuild the modified code code package or entire program.

3. Dynamic loading of new code:

   Load new code into the runtime environment by using reflection mechanisms such as plugin packages or reflect.

4. Replace the old code:

   Replace the old code object with the new code so that it takes effect immediately.

It should be noted that hot update is not a built-in feature of the Go language, but is implemented by developers using corresponding technical means according to their needs. The specific implementation will vary depending on the complexity and needs of the project. The following are some commonly used hot update implementation methods:

• Use third-party libraries: such as gin, fresh, air, etc., which provide automatic recompilation and hot loading functions, which can be easily Perform code hot updates.

• Use the plug-in system: By using Go's plugin package, the program can be split into multiple plug-ins. Each plug-in can be compiled and loaded independently to achieve hot updates.

• Use reflection mechanism: By using the reflection mechanism of Go language, you can dynamically load new code and replace old code objects at runtime.

It should be noted that hot update may have some potential problems, such as memory leaks, instability, etc. Therefore, when using hot update, you need to carefully consider its applicability and potential risks to ensure the correctness and stability of the code.

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