50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
// Package env implements encoding and decoding between environment variable and a typed Configuration.
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package env
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import (
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"strings"
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"github.com/containous/traefik/pkg/config/parser"
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)
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// Decode decodes the given environment variables into the given element.
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// The operation goes through four stages roughly summarized as:
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// env vars -> map
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// map -> tree of untyped nodes
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// untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
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// "typed" nodes -> typed element
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func Decode(environ []string, element interface{}) error {
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vars := make(map[string]string)
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for _, evr := range environ {
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n := strings.SplitN(evr, "=", 2)
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if strings.HasPrefix(strings.ToUpper(n[0]), "TRAEFIK_") {
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key := strings.ReplaceAll(strings.ToLower(n[0]), "_", ".")
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vars[key] = n[1]
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}
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}
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return parser.Decode(vars, element)
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}
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// Encode encodes the configuration in element into the environment variables represented in the returned Flats.
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// The operation goes through three stages roughly summarized as:
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// typed configuration in element -> tree of untyped nodes
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// untyped nodes -> nodes augmented with metadata such as kind (inferred from element)
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// "typed" nodes -> environment variables with default values (determined by type/kind)
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func Encode(element interface{}) ([]parser.Flat, error) {
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if element == nil {
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return nil, nil
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}
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node, err := parser.EncodeToNode(element, false)
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if err != nil {
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return nil, err
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}
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err = parser.AddMetadata(element, node)
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if err != nil {
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return nil, err
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}
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return parser.EncodeToFlat(element, node, parser.FlatOpts{Case: "upper", Separator: "_"})
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}
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