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environment.go
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/
environment.go
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package env
import (
"fmt"
"os"
)
type Environment struct {
Readers []EnvReader
}
var (
Docker EnvReader = &DockerProvider{}
CloudFoundry = &CloudFoundryProvider{}
Bluemix = &CloudFoundryProvider{}
OpenShift = EnvReaderFunc(unimplemented)
Heroku = EnvReaderFunc(unimplemented)
AWS = EnvReaderFunc(unimplemented)
Azure = EnvReaderFunc(unimplemented)
OperatingSystem = EnvReaderFunc(unimplemented)
)
func unimplemented(key string) string {
return ""
}
func NewEnvironment() *Environment {
return NewEnvironmentWithEnvReaders(Docker, CloudFoundry, OpenShift, Heroku, AWS, Azure)
}
func NewEnvironmentWithEnvReaders(readers ...EnvReader) *Environment {
return &Environment{Readers: readers}
}
func (e *Environment) String() string {
return fmt.Sprintf("EnvReader List: %d", e.Readers)
}
func (e *Environment) Getenv(key string) string {
for _, reader := range e.Readers {
if val := reader.Getenv(key); val != "" {
return val
}
}
return ""
}
func (e *Environment) SafeCopyToEnvironment(keys ...string) {
envToSet := make(map[string]string)
for _, key := range keys {
if os.Getenv(key) == "" {
if env := e.Getenv(key); env != "" {
envToSet[key] = env
}
}
}
for key, val := range envToSet {
os.Setenv(key, val)
}
}
func (e *Environment) CopyAndOverrideEnvironment(keys ...string) {
envToSet := make(map[string]string)
for _, key := range keys {
if env := e.Getenv(key); env != "" {
envToSet[key] = env
}
}
for key, val := range envToSet {
if err := os.Setenv(key, val); err != nil {
fmt.Println("Error overriding key:", key, "to val", val)
}
}
}