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|
package envload
import (
"bytes"
"context"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
func (e *sysenv) Clearenv() {
os.Clearenv()
}
func (e *sysenv) Setenv(k, v string) {
os.Setenv(k, v)
}
func SystemEnvironment() Environment {
return &sysenv{}
}
func New(environ ...string) *Loader {
if len(environ) == 0 {
environ = os.Environ()
}
var envdir string
original := make([]iterItem, 0, len(environ))
for _, v := range environ {
i := strings.IndexByte(v, '=')
if i <= 0 || i >= len(v)-1 {
continue
}
original = append(original, iterItem{
key: v[:i],
value: v[i+1:],
})
if v[:i] == "ENVDIR" {
envdir = v[i+1:]
}
}
return &Loader{
original: original,
envdir: envdir,
}
}
func (l *Loader) Restore(options ...Option) error {
var ctx context.Context = context.Background()
var e Environment = SystemEnvironment()
var loadEnvdir bool
for _, o := range options {
switch o.Name() {
case ContextKey:
ctx = o.Value().(context.Context)
case EnvironmentKey:
e = o.Value().(Environment)
case LoadEnvdirKey:
loadEnvdir = o.Value().(bool)
}
}
return l.Apply(ctx, e, WithLoadEnvdir(loadEnvdir))
}
func (l *Loader) Apply(octx context.Context, e Environment, options ...Option) error {
ctx, cancel := context.WithCancel(octx)
defer cancel()
e.Clearenv()
iter := l.Iterator(ctx, options...)
for iter.Next() {
k, v := iter.KV()
e.Setenv(k, v)
}
return nil
}
func (l *Loader) Environ(octx context.Context, options ...Option) []string {
ctx, cancel := context.WithCancel(octx)
defer cancel()
var environ []string
it := l.Iterator(ctx, options...)
for it.Next() {
k, v := it.KV()
environ = append(environ, k+`=`+v)
}
return environ
}
func (l *Loader) Iterator(ctx context.Context, options ...Option) *Iterator {
loadEnvdir := true
for _, o := range options {
switch o.Name() {
case LoadEnvdirKey:
loadEnvdir = o.Value().(bool)
}
}
ch := make(chan *iterItem)
var ex chan *iterItem
if loadEnvdir && l.envdir != "" {
if fi, err := os.Stat(l.envdir); err == nil && fi.IsDir() {
ex = make(chan *iterItem)
}
}
go func(m []iterItem, ch, ex chan *iterItem) {
defer close(ch)
for _, it := range m {
select {
case <-ctx.Done():
return
case ch <- &iterItem{key: it.key, value: it.value}:
}
}
if ex == nil {
return
}
for {
select {
case <-ctx.Done():
return
case it, ok := <-ex:
if !ok {
return
}
select {
case <-ctx.Done():
return
case ch <- it:
}
}
}
}(l.original, ch, ex)
// meanwhile, load from envdir, if available
if ex != nil {
go func() {
defer close(ex)
filepath.Walk(l.envdir, func(path string, fi os.FileInfo, err error) error {
// Ignore errors
if err != nil {
return nil
}
// Do not recurse into directories
if fi.IsDir() && l.envdir != path {
return filepath.SkipDir
}
buf, err := ioutil.ReadFile(path)
if err != nil {
return nil
}
ex <- &iterItem{
key: filepath.Base(path),
value: string(bytes.TrimSpace(buf)),
}
return nil
})
}()
}
return &Iterator{
ch: ch,
}
}
func (iter *Iterator) Next() bool {
iter.nextK = ""
iter.nextV = ""
pair, ok := <-iter.ch
if !ok {
return false
}
iter.nextK = pair.key
iter.nextV = pair.value
return true
}
func (iter *Iterator) KV() (string, string) {
return iter.nextK, iter.nextV
}
|
