51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package env
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import (
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"context"
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"strings"
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"github.com/micro/go-micro/config/source"
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)
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type strippedPrefixKey struct{}
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type prefixKey struct{}
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// WithStrippedPrefix sets the environment variable prefixes to scope to.
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// These prefixes will be removed from the actual config entries.
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func WithStrippedPrefix(p ...string) source.Option {
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return func(o *source.Options) {
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if o.Context == nil {
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o.Context = context.Background()
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}
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o.Context = context.WithValue(o.Context, strippedPrefixKey{}, appendUnderscore(p))
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}
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}
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// WithPrefix sets the environment variable prefixes to scope to.
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// These prefixes will not be removed. Each prefix will be considered a top level config entry.
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func WithPrefix(p ...string) source.Option {
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return func(o *source.Options) {
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if o.Context == nil {
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o.Context = context.Background()
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}
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o.Context = context.WithValue(o.Context, prefixKey{}, appendUnderscore(p))
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}
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}
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func appendUnderscore(prefixes []string) []string {
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//nolint:prealloc
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var result []string
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for _, p := range prefixes {
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if !strings.HasSuffix(p, "_") {
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result = append(result, p+"_")
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continue
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}
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result = append(result, p)
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}
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return result
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}
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