Go-container

Simple dependency injection service container for golang

Usage

Suppose we have the following files:

• app/config/config.go => Configuration values collection

  // app/config/config.go
  package config
  
  type Config struct {
          UserServiceUrl string
  }

• app/user/service.go => Service to manipulate users through external endpoint

  // app/user/service.go
  package user
  
  import (
          "app/config"
  )
  
  type Service struct {
          // Will be injected
          Config config.Config `inject:"config"`
  }
  
  func (svc *Service) GetUserByID(id string) error {
          _, err := http.Get(fmt.Sprintf("%s/%s", svc.Config.SomeUrl, id))
          return err
  }

• app/main.go => application main file

// app/main.go
package main

import (
	"fmt"
        "log"

	"github.com/ncrypthic/gocontainer"

        "app/config"
        "app/user"
)

func main() {
        config := Config{
                UserServiceUrl: "http://example.com/users",
        }
        // no need to manually pass config to user.Service struct
        userService := new(user.Service)
	container := gocontainer.NewContainer()
	container.RegisterService("config", config)
	container.RegisterService("userService", userService)
        // Populate and inject dependencies
	if err := container.Ready(); err != nil {
                log.Fatalf("Failed to populate service container! %v", err)
        }
        // do GET request to http://example.com/users/some-id
	userService.GetUserByID("some-id")
}

Service container allow clean intialization file by injecting dependencies to every services in the container.

License

MIT License