Getting Started

Set Up Golang Development Environment

1. If you haven’t set up your Golang environment yet, you can refer to Golang Install.
2. We recommend that you use the latest version of Golang, or make sure it’s >= v1.15. You can choose to use the earlier versions, but the compatibility and stability are not guaranteed.
3. Make sure the go mod support is enabled (for Golang versions >= v1.15, it is enabled by default).

Currently, Hertz supports Linux, macOS, and Windows systems.

Quick Start

After completing the environment preparation, you can quickly start the Hertz Server as follows:

1. Create the hertz_demo folder in the current directory and go to that directory.

2. Create the main.go file.

3. Add the following code to the main.go file.

   package main
   
   import (
       "context"
   
       "github.com/cloudwego/hertz/pkg/app"
       "github.com/cloudwego/hertz/pkg/app/server"
       "github.com/cloudwego/hertz/pkg/common/utils"
       "github.com/cloudwego/hertz/pkg/protocol/consts"
   )
   
   func main() {
       h := server.Default()
   
       h.GET("/ping", func(c context.Context, ctx *app.RequestContext) {
               ctx.JSON(consts.StatusOK, utils.H{"message": "pong"})
       })
   
       h.Spin()
   }
   

4. Generate the go.mod file.

   go mod init hertz_demo
   

5. Tidy & get dependencies.

   go mod tidy
   

6. Run the Sample Code

   go run hertz_demo
   

   If the server is launched successfully, you will see following message:

   2022/05/17 21:47:09.626332 engine.go:567: [Debug] HERTZ: Method=GET    absolutePath=/ping   --> handlerName=main.main.func1 (num=2 handlers)
   2022/05/17 21:47:09.629874 transport.go:84: [Info] HERTZ: HTTP server listening on address=[::]:8888
   

   Then, we can test the interface:

   curl http://127.0.0.1:8888/ping
   

   If nothing goes wrong, we can see the following output:

   {"message":"pong"}
   

Code Generation Tool hz

Hz is a command-line tool provided by the Hertz framework for generating code, which can be used to generate scaffolding for Hertz projects.

Install the command tool of hz

First, you need to install the command tool hz which is used in this chapter:

1. Confirm the GOPATH environment has been defined correctly (For example export GOPATH=~/go) and the $GOPATH/bin has been added to PATH environment (For example export PATH=$GOPATH/bin:$PATH); Attention, do not set GOPATH to a directory that the current user does not have read/write access to.
2. Install hz: go install github.com/cloudwego/hertz/cmd/hz@latest.

For more information on how to use hz, please refer to: hz.

Determine Where to Store Your Code

1. If your codes are located in $GOPATH/src, you will need to create an additional dictionary in $GOPATH/src and retrieve your code from that dictionary.

   mkdir -p $(go env GOPATH)/src/github.com/cloudwego
   cd $(go env GOPATH)/src/github.com/cloudwego
   

2. If your codes are not placed under GOPATH, you can retrieve them directly.

Generate/Complete the Sample Code

1. Create the hertz_demo folder in the current directory and go to that directory.

2. Generate code hz new. If your codes are not placed under GOPATH, you need to refer here and add -module (or -mod) flag to name your custom module.

3. Tidy & get dependencies.

   go mod init # If your codes are not placed under `GOPATH`, you can skip `go mod init`.
   go mod tidy
   

Run the Sample Code

After you have completed the previous steps, you are able to compile & launch the server.

go build -o hertz_demo && ./hertz_demo

If the server is launched successfully, you will see following message:

2022/05/17 21:47:09.626332 engine.go:567: [Debug] HERTZ: Method=GET    absolutePath=/ping   --> handlerName=main.main.func1 (num=2 handlers)
2022/05/17 21:47:09.629874 transport.go:84: [Info] HERTZ: HTTP server listening on address=[::]:8888

Then, we can test the interface:

curl http://127.0.0.1:8888/ping

If nothing goes wrong, we can see the following output:

{"message":"pong"}

You have now successfully launched Hertz Server successfully and completed an API call.

Updating the project code

After verifying the Hertz Server successfully, if you need to make further updates to the project, you can use hz update, take thrift as an example, and create a new hello.thrift in the root directory of the project.

namespace go hello.world

service HelloService {
    string Hello(1: string name),
}

Instead of using hz new, you should use hz update to update the project code. So run it in the project root directory.

hz update -idl hello.thrift

As expected, you should have a few more files in your project, so keep updating your project with hz update!

Tip

This is just a demonstration of thrift, but protobuf is used in a similar way, see. However, please NOTE that there are major differences between protobuf and thrift in terms of command usage, so please read carefully.

More examples

Please refer：Example code