Golang does not need to be restarted to update

In software development, updates are an inevitable step. Especially in server-side applications, updating the code may require restarting the system or recompiling the deployment process, which will seriously affect the availability and efficiency of the application. But sometimes we need to update the application, but cannot restart or recompile and deploy it. At this time, the hot update mechanism provided by the golang language is very useful. This article will explore how golang implements updates without restarting.

1. What is golang’s hot update mechanism?

Golang hot update mechanism refers to a method of updating the program online while the application is running without restarting the entire application or recompiling and deploying. If we use hot update technology when writing golang applications, we can dynamically update the program while the application is running, avoiding the trouble of restarting the application. This technology can significantly improve program usability and efficiency.

2. How does golang implement hot update?

Golang’s hot update mechanism can be implemented in the following ways:

1. Using golang’s plugin package

Golang’s plugin package provides a Method to load shared libraries. We can use the plugin package to load shared libraries into our application. If our given shared library is a plug-in written in golang language, the library can be loaded and unloaded dynamically at runtime. If there is a function in this library that implements Init() or contains an init function that returns a structure pointer, you can initialize the variables or functions in the shared library when loading this shared library. In this way, we can implement hot updates at runtime through the plugin package.

2. Hot update framework gin, beego, etc.

gin is one of the popular web frameworks in golang, which provides hot update functionality. When using the gin framework, we only need to write code and save the files, and gin will automatically detect file updates and recompile and load them. This means there is no need to restart the application, we just need to update our codes and reload them. Beego is another golang web framework that also provides hot update functionality. The hot update function provided by beego can be turned on when the application is started, or it can be turned on manually through commands.

3. Other third-party libraries

In addition to the gin and beego frameworks, there are some other third-party libraries that also provide golang’s hot update function. Such as fresh, gowatch, etc.

3. Benefits of golang’s hot update mechanism

Golang’s hot update mechanism has the following benefits compared to implementations in other languages:

1. Little impact on the program

Hot updates have very little impact on applications because they do not require restarting or recompiling deployments. This can significantly increase program availability and efficiency while also reducing the risk of failure analysis and potential data loss.

2. Rapid development and debugging

Golang’s hot update mechanism can help developers quickly develop and debug applications. If we use golang's hot update mechanism, we can quickly respond to demand changes and implement application updates and debugging in the shortest time.

3. Improve development efficiency

Hot update technology makes the update process of codes and applications simpler and faster, which can reduce the workload of developers and improve their development efficiency. .

4. Eliminate the trouble of restarting

Golang’s hot update mechanism can eliminate the trouble of restarting and recompiling and deploying, reducing maintenance work and the burden on the operating system.

In short, golang's hot update mechanism is a very useful and practical technology. If the application needs to be updated frequently, using golang's hot update mechanism can greatly improve the usability and efficiency of the program, reduce the risk of errors and data loss, and also provide developers with a faster and more effective development and debugging experience.

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