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import "github.com/kelseyhightower/envconfig"
See godoc
Set some environment variables:
export MYAPP_DEBUG=false
export MYAPP_PORT=8080
export MYAPP_USER=Kelsey
export MYAPP_RATE="0.5"
export MYAPP_TIMEOUT="3m"
export MYAPP_USERS="rob,ken,robert"
export MYAPP_COLORCODES="red:1,green:2,blue:3"
Write some code:
package main
import (
"fmt"
"log"
"time"
"github.com/kelseyhightower/envconfig"
)
type Specification struct {
Debug bool
Port int
User string
Users []string
Rate float32
Timeout time.Duration
ColorCodes map[string]int
}
func main() {
var s Specification
err := envconfig.Process("myapp", &s)
if err != nil {
log.Fatal(err.Error())
}
format := "Debug: %v\nPort: %d\nUser: %s\nRate: %f\nTimeout: %s\n"
_, err = fmt.Printf(format, s.Debug, s.Port, s.User, s.Rate)
if err != nil {
log.Fatal(err.Error())
}
fmt.Println("Users:")
for _, u := range s.Users {
fmt.Printf(" %s\n", u)
}
fmt.Println("Color codes:")
for k, v := range s.ColorCodes {
fmt.Printf(" %s: %d\n", k, v)
}
}
Results:
Debug: false
Port: 8080
User: Kelsey
Rate: 0.500000
Timeout: 3m0s
Users:
rob
ken
robert
Color codes:
red: 1
green: 2
blue: 3
Envconfig supports the use of struct tags to specify alternate, default, and required
environment variables.
For example, consider the following struct:
type Specification struct {
ManualOverride1 string `envconfig:"manual_override_1"`
DefaultVar string `default:"foobar"`
RequiredVar string `required:"true"`
IgnoredVar string `ignored:"true"`
AutoSplitVar string `split_words:"true"`
}
Envconfig has automatic support for CamelCased struct elements when the
split_words:"true"
tag is supplied. Without this tag, AutoSplitVar
above
would look for an environment variable called MYAPP_AUTOSPLITVAR
. With the
setting applied it will look for MYAPP_AUTO_SPLIT_VAR
. Note that numbers
will get globbed into the previous word. If the setting does not do the
right thing, you may use a manual override.
Envconfig will process value for ManualOverride1
by populating it with the
value for MYAPP_MANUAL_OVERRIDE_1
. Without this struct tag, it would have
instead looked up MYAPP_MANUALOVERRIDE1
. With the split_words:"true"
tag
it would have looked up MYAPP_MANUAL_OVERRIDE1
.
export MYAPP_MANUAL_OVERRIDE_1="this will be the value"
# export MYAPP_MANUALOVERRIDE1="and this will not"
If envconfig can't find an environment variable value for MYAPP_DEFAULTVAR
,
it will populate it with "foobar" as a default value.
If envconfig can't find an environment variable value for MYAPP_REQUIREDVAR
,
it will return an error when asked to process the struct.
If envconfig can't find an environment variable in the form PREFIX_MYVAR
, and there
is a struct tag defined, it will try to populate your variable with an environment
variable that directly matches the envconfig tag in your struct definition:
export SERVICE_HOST=127.0.0.1
export MYAPP_DEBUG=true
type Specification struct {
ServiceHost string `envconfig:"SERVICE_HOST"`
Debug bool
}
Envconfig won't process a field with the "ignored" tag set to "true", even if a corresponding
environment variable is set.
envconfig supports supports these struct field types:
Embedded structs using these fields are also supported.
Any field whose type (or pointer-to-type) implements envconfig.Decoder
can
control its own deserialization:
export DNS_SERVER=8.8.8.8
type IPDecoder net.IP
func (ipd *IPDecoder) Decode(value string) error {
*ipd = IPDecoder(net.ParseIP(value))
return nil
}
type DNSConfig struct {
Address IPDecoder `envconfig:"DNS_SERVER"`
}
Also, envconfig will use a Set(string) error
method like from the
flag.Value interface if implemented.
本项目是群体化方法与技术的开源实现案例,在基于Gitea的基础上,进一步支持社交化的协同开发、协同学习、协同研究等群体创新实践服务,特别是针对新一代人工智能技术特点,重点支持项目管理、git代码管理、大数据集存储管理与智能计算平台接入。
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