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add a prefix parameter to GetConfig and make SSM parameters optional #16

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Merged
briskt merged 1 commit into from
Aug 6, 2026
Merged

add a prefix parameter to GetConfig and make SSM parameters optional #16

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15 changes: 10 additions & 5 deletions parcs/parcs.go
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Original file line number Diff line number Diff line change
Expand Up @@ -136,13 +136,18 @@ type PMISTran struct {
OPPTransactionDate string `xml:"OPP_Transaction_Date"`
}

// GetConfig reads from AWS Systems Manager Parameter Store and returns a Config structure for use by other functions
// in this package.
func GetConfig(ctx context.Context) (Config, error) {
// GetConfig reads from environment variables, and optionally AWS Systems Manager Parameter Store, and returns a Config
// structure for use by other functions in this package. The prefix parameter is used to differentiate operating
// environments. Environment variable names must be prefixed with this string. If the environment variable PARAMETER_STORE_PREFIX
// is defined, SSM parameters having that prefix will be read before loading environment variables. Thus, environment
// can override SSM parameters but not the other way around.
func GetConfig(ctx context.Context, prefix string) (Config, error) {
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var cfg Config
config.ReadParameterStore(os.Getenv("PARAMETER_STORE_PREFIX"), &cfg)
if psPrefix := os.Getenv("PARAMETER_STORE_PREFIX"); psPrefix != "" {
config.ReadParameterStore(psPrefix, &cfg)
}

if err := envconfig.Process("", &cfg); err != nil {
if err := envconfig.Process(prefix, &cfg); err != nil {
return Config{}, err
}

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