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fix: set environment variables config values correctly for camelCaseconfig keys #245

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fix: set environment variables config values correctly for camelCaseconfig keys #245

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18 changes: 18 additions & 0 deletions config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import (
"github.com/cloudhut/kminion/v2/prometheus"
"github.com/knadh/koanf"
"github.com/knadh/koanf/parsers/yaml"
"github.com/knadh/koanf/providers/confmap"
"github.com/knadh/koanf/providers/env"
"github.com/knadh/koanf/providers/file"
"github.com/mitchellh/mapstructure"
Expand Down Expand Up @@ -102,6 +103,23 @@ func newConfig(logger *zap.Logger) (Config, error) {
return Config{}, err
}

// Lowercase the keys that are stored internally within Koanf and reload them. This is a workaround because
// internally keys are stored case sensitive. This causes the problem that environment variables can't match
// the exact key and therefore will not be unmarshalled as expected anymore. Example:
// YAML path: minion.endToEnd.enabled
// ENV path: MINION_ENDTOEND_ENABLED => minion.endtoend.enabled
// Internal key: minion.endToEnd.enabled
// See issue: https://github.com/redpanda-data/kminion/issues/179
keys := make(map[string]interface{}, len(k.Keys()))
for _, key := range k.Keys() {
keys[strings.ToLower(key)] = k.Get(key)
}
k.Delete("")
err = k.Load(confmap.Provider(keys, "."), nil)
if err != nil {
return Config{}, fmt.Errorf("failed to unmarshal confmap variables into config struct: %w", err)
}

err = k.Unmarshal("", &cfg)
if err != nil {
return Config{}, err
Expand Down