Go语言YAML配置文件库，类似于spring-boot

一个简单的 go 语言配置文件库，将YAML配置自动映射到实体中, 类似与spring-boot配置文件。 会从根实体strut遍历实体属性，如果类型为bool, string, 整型, 浮点型，map[string]interface{}，[]interface{}, 则会根据tag中的 profile 值(不设置则为当前属性名的首字母变小写)解析YAML或flag或环境变量，并赋值； 若YAML或flag或环境变量都不存在，则使用tag中的 profileDefault 设置默认值； 若默认值也未设置，则返回error。默认变量优先级啊：环境变量 > flag参数 > YAML > profileDefault默认值， 可以通过设置envHigher未false，让flag优先级 > 环境变量。 注意： 接收类型和返回类型都需要为指针类型 。

单profile下的使用：

eureka:
  instance:
    preferIpAddress: true
    leaseRenewalIntervalInSeconds: 10
    leaseExpirationDurationInSeconds: 30
  client:
    serviceUrl:
      defaultZone: http://localhost:8000/eureka/
    registryFetchIntervalSeconds: 10
logging:
  level:
    github.com/flyleft/consul-iris/pkg/config: info
    github.com/flyleft/consul-iris/pkg/route: debug
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type SingleEnv struct {
	Eureka  SingleEureka
	Logging map[string]interface{} `profile:"logging.level" profileDefault:"{\"github.com/flyleft/consul-iris\":\"debug\"}"`
}

type SingleEureka struct {
	PreferIpAddress                  bool   `profile:"instance.preferIpAddress"`
	LeaseRenewalIntervalInSeconds    int32  `profile:"instance.leaseRenewalIntervalInSeconds"`
	LeaseExpirationDurationInSeconds uint   `profile:"instance.leaseExpirationDurationInSeconds"`
	ServerDefaultZone                string `profile:"client.serviceUrl.defaultZone" profileDefault:"http://localhost:8000/eureka/"`
	RegistryFetchIntervalSeconds     byte   `profile:"client.registryFetchIntervalSeconds"`
}

//使用
func main()  {
	env, err := Profile(&SingleEnv{}, "test-single-profile.yml", true)
	if err != nil {
		t.Error("Profile execute error", err)
	}
	trueEnv := env.(*SingleEnv)
}
//通过环境变量覆盖配置，比如设置EUREKA_INSTANCE_LEASERENEWALINTERVALINSECONDS环境变量值覆盖eureka.instance.leaseRenewalIntervalInSeconds
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多profile下的使用：

profiles:
  active: dev # 设置生效的profile

dev:
  database:
    username: root
    password: root
  eureka:
    zone: http://localhost:8000/eureka/
    fetchInterval: 10
  logging:
    level:
      github.com/flyleft/consul-iris/pkg/config: info
      github.com/flyleft/consul-iris/pkg/route: debug


production:
  database:
    username: production
    password: production
  eureka:
    zone: http://localhost:8000/eureka/
    fetchInterval: 10
  logging:
    level:
      github.com/flyleft/consul-iris/pkg/config: info
      github.com/flyleft/consul-iris/pkg/route: debug

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type Eureka struct {
	Zone          string `profile:"zone"`
	FetchInterval int    `profile:"fetchInterval"`
}

type DataSource struct {
	Host     string `profile:"host" profileDefault:"localhost"`
	Username string `profile:"username"`
	Password string `profile:"password"`
}

type MultiEnv struct {
	DataSource DataSource `profile:"database"`
	Eureka     Eureka
	Logging    map[string]interface{} `profile:"logging.level" profileDefault:"{\"github.com/flyleft/consul-iris\":\"debug\"}"`
	Users      []interface{}          `profile:"users" profileDefault:"[\"admin\",\"test\",\"root\"]"`
}
func main()  {
	env, err := Profile(&MultiEnv{}, "test-multi-profile.yml", true)
	if err != nil {
		t.Error("Profile execute error", err)
	}
	trueEnv := env.(*MultiEnv)
}
//可通过环境变量DEV_EUREKA_ZONE覆盖eureka.zone的值
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定义实体