03. Preliminary use of golang

Since early 2016 From the year onwards , There is an internal trend of mobile priority and cloud priority , But based on the current situation , We cannot advance quickly . Over the years, the entire enterprise operating environment has been deployed in the cloud , The basic platform within the enterprise is basically formed ： Private cloud , Public cloud , The government cloud is constantly upgrading / to update .

In the environment , We have also completed the preliminary internal transformation , From monomer application （C# edition ） To the micro application version （Java edition ）. Already has containerization / The basic conditions of cloud deployment . The next step will continue to promote the transformation of cloud environment .

When we enter cloud deployment , The mature market plan is :k8s+docker, These two core components are oriented golang. As a developer , It is definitely impossible to just stay on the use of tools , And will continue to explore the implementation behind the tool .golang Become the language we must face .

Used nearly 5 Hours , hold golang Running environment /vscode go Related to the plug-in , And right golang The documents on the official website have been sorted out completely , Form a pair of golang Preliminary experience of language .

1. Code organization

golang The language uses module---->package----->func Three levels of management , There is no concept of a class , But there is information such as interface definition .

2. grammar

Grammar adopts a natural language oriented model , The general way is still according to c The parsing framework of language . Like a function ：

The above picture is from the official website ：

func Declare for method ;ReverseRunes Method NOUN ;（s string）:(s Parameters string Is the data type ) string Return type .

This rule is in line with natural language thinking .

3. data type

Data type and c#/java similar , Basic types are defined , Structure can be provided / Interface definition and other information .

4. Variable

The assignment of variables adopts var Make a statement , It also adopts inferential direct assignment across domains .

5. Control language

Natural language oriented model is adopted to build , See the description on the official website for details .

Effective Go - The Go Programming Language (google.cn)

6. External package management

Adopted import Import packages , In order to download external packages to the local , After setting the import package , perform go get .  /go mod tidy Wait for the operation .

because golang The package management of adopts the default configuration ,golang Official Website Package Management , In China, it is often slow . So ,go Open package management agent configuration variables , You can add GOPROXY Variable to point to a specific package management service . The domestic image addresses are ：https://proxy.golang.com.cn,direct

 

7. Running environment

because golang Language is a relatively new language , The original intention of the design is to revise c/c++/java Such as the inhuman content of language . So while giving priority to performance , It provides a large number of highly self consistent standard expansion packages , Such as http/net/sqldb etc. , Ordinary users only need to use the standard package with high cohesion , You can quickly achieve web service , Data access and other information , Let these components, which are already recognized services, become the foundation , Make it easy for users / Quickly build business implementation ......

It can be understood as golang It's close to c Language , But it provides a large number of development platforms for basic application implementation . The code implementation pattern is between process oriented and object-oriented , Finally, the balance between performance and implementation difficulty is achieved .........

8. ecology

golang Language proximity c Language , But there are more standard expansion packs , And adopted the open source mode to operate . The full open source model has attracted a large number of enterprises , And grasp the cloud oriented implementation , At present golang Cloud based platform implementation language that has become a reality ：docker/k8s Have been used golang Realization . And is constantly moving towards web Application extension .