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February 11, 2025 16:46
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| Got it! You need a structured way to retrieve values using a combination of configuration, environment variables, and AWS Secrets Manager. Let’s break this down into logical Go components: | |
| • Configuration Loader: Reads the configuration file to define how values are retrieved. | |
| • Static Value Getter: Acts as a manager that determines if a value comes from an environment variable or AWS Secrets Manager. | |
| • Secret Retriever: Handles fetching and parsing secrets from AWS Secrets Manager. | |
| • Structs: Holds the values retrieved for easy access. | |
| Project Structure | |
| valuegetter/ | |
| │── config/ | |
| │ ├── config.go # Loads configuration file | |
| │── secrets/ | |
| │ ├── aws_secrets.go # Handles AWS Secrets Manager retrieval | |
| │── values/ | |
| │ ├── getter.go # StaticValueGetter logic | |
| │── main.go # Example usage | |
| 1. Configuration Loader (config/config.go) | |
| This will load a configuration file (e.g., JSON, YAML) defining how values should be retrieved. | |
| package config | |
| import ( | |
| "encoding/json" | |
| "os" | |
| ) | |
| // Config represents the structure for value retrieval configuration. | |
| type Config struct { | |
| Values map[string]ValueConfig `json:"values"` | |
| } | |
| // ValueConfig defines how a value should be retrieved. | |
| type ValueConfig struct { | |
| EnvOverride string `json:"env_override"` // Environment variable name | |
| AwsSecret string `json:"aws_secret"` // AWS Secret key | |
| JsonKey string `json:"json_key"` // JSON key inside AWS Secret | |
| } | |
| // LoadConfig reads configuration from a JSON file. | |
| func LoadConfig(filePath string) (*Config, error) { | |
| data, err := os.ReadFile(filePath) | |
| if err != nil { | |
| return nil, err | |
| } | |
| var cfg Config | |
| err = json.Unmarshal(data, &cfg) | |
| if err != nil { | |
| return nil, err | |
| } | |
| return &cfg, nil | |
| } | |
| 2. AWS Secrets Manager Retriever (secrets/aws_secrets.go) | |
| This handles AWS Secrets retrieval and JSON parsing. | |
| package secrets | |
| import ( | |
| "encoding/json" | |
| "errors" | |
| "os" | |
| "github.com/aws/aws-sdk-go/aws/session" | |
| "github.com/aws/aws-sdk-go/service/secretsmanager" | |
| ) | |
| // GetSecret retrieves a secret from AWS Secrets Manager. | |
| func GetSecret(secretName string) (map[string]string, error) { | |
| sess := session.Must(session.NewSession()) | |
| svc := secretsmanager.New(sess) | |
| input := &secretsmanager.GetSecretValueInput{ | |
| SecretId: &secretName, | |
| } | |
| result, err := svc.GetSecretValue(input) | |
| if err != nil { | |
| return nil, err | |
| } | |
| var secretMap map[string]string | |
| if err := json.Unmarshal([]byte(*result.SecretString), &secretMap); err != nil { | |
| return nil, err | |
| } | |
| return secretMap, nil | |
| } | |
| // GetSecretValue retrieves a specific value from AWS Secrets Manager. | |
| func GetSecretValue(secretName, key string) (string, error) { | |
| secrets, err := GetSecret(secretName) | |
| if err != nil { | |
| return "", err | |
| } | |
| value, exists := secrets[key] | |
| if !exists { | |
| return "", errors.New("key not found in secret") | |
| } | |
| return value, nil | |
| } | |
| 3. Static Value Getter (values/getter.go) | |
| This checks for environment overrides first, then falls back to AWS Secrets Manager. | |
| package values | |
| import ( | |
| "fmt" | |
| "os" | |
| "sync" | |
| "github.com/your_project/config" | |
| "github.com/your_project/secrets" | |
| ) | |
| // ValueGetter manages cached values. | |
| type ValueGetter struct { | |
| mu sync.RWMutex | |
| values map[string]string | |
| config *config.Config | |
| } | |
| // NewValueGetter initializes a ValueGetter with configuration. | |
| func NewValueGetter(cfg *config.Config) *ValueGetter { | |
| return &ValueGetter{ | |
| values: make(map[string]string), | |
| config: cfg, | |
| } | |
| } | |
| // GetSomeValue retrieves a value based on the configuration. | |
| func (vg *ValueGetter) GetSomeValue(key string) (string, error) { | |
| vg.mu.RLock() | |
| if val, exists := vg.values[key]; exists { | |
| vg.mu.RUnlock() | |
| return val, nil | |
| } | |
| vg.mu.RUnlock() | |
| cfg, exists := vg.config.Values[key] | |
| if !exists { | |
| return "", fmt.Errorf("no configuration found for key: %s", key) | |
| } | |
| // Check for environment override | |
| if envValue, found := os.LookupEnv(cfg.EnvOverride); found { | |
| vg.setValue(key, envValue) | |
| return envValue, nil | |
| } | |
| // Fallback to AWS Secrets Manager | |
| secretValue, err := secrets.GetSecretValue(cfg.AwsSecret, cfg.JsonKey) | |
| if err != nil { | |
| return "", err | |
| } | |
| vg.setValue(key, secretValue) | |
| return secretValue, nil | |
| } | |
| // setValue caches the retrieved value. | |
| func (vg *ValueGetter) setValue(key, value string) { | |
| vg.mu.Lock() | |
| defer vg.mu.Unlock() | |
| vg.values[key] = value | |
| } | |
| 4. Example Usage (main.go) | |
| This demonstrates how to use the ValueGetter. | |
| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| "github.com/your_project/config" | |
| "github.com/your_project/values" | |
| ) | |
| func main() { | |
| // Load config | |
| cfg, err := config.LoadConfig("config.json") | |
| if err != nil { | |
| log.Fatalf("Error loading config: %v", err) | |
| } | |
| // Create ValueGetter | |
| valueGetter := values.NewValueGetter(cfg) | |
| // Get a value | |
| key := "database_password" | |
| value, err := valueGetter.GetSomeValue(key) | |
| if err != nil { | |
| log.Fatalf("Error getting value: %v", err) | |
| } | |
| fmt.Printf("Retrieved value for %s: %s\n", key, value) | |
| } | |
| 5. Example Config (config.json) | |
| This defines how values should be retrieved. | |
| { | |
| "values": { | |
| "database_password": { | |
| "env_override": "DB_PASSWORD", | |
| "aws_secret": "MyDatabaseSecrets", | |
| "json_key": "password" | |
| }, | |
| "api_key": { | |
| "env_override": "API_KEY", | |
| "aws_secret": "ApiSecrets", | |
| "json_key": "key" | |
| } | |
| } | |
| } | |
| How This Works | |
| 1. Check Environment Variable | |
| • If DB_PASSWORD exists, use it. | |
| 2. Otherwise, Retrieve from AWS Secrets Manager | |
| • Use MyDatabaseSecrets and get the password key. | |
| 3. Cache the Value | |
| • Avoid repeated AWS requests. | |
| Why This Approach? | |
| ✅ Thread-safe caching (via sync.RWMutex) | |
| ✅ Environment-first approach (allows local overrides) | |
| ✅ AWS Secrets Manager integration (secure secret retrieval) | |
| ✅ Flexible JSON configuration (easy modifications) | |
| Would you like any refinements? 🚀 |
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