|
| 1 | +package config |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "fmt" |
| 6 | + "os" |
| 7 | + "strconv" |
| 8 | + "strings" |
| 9 | + |
| 10 | + "gopkg.in/yaml.v3" |
| 11 | +) |
| 12 | + |
| 13 | +// ConfigSource represents a configuration input that can mutate the manager state. |
| 14 | +type ConfigSource interface { |
| 15 | + Apply(*ConfigManager) error |
| 16 | +} |
| 17 | + |
| 18 | +// ConfigSourceFunc allows plain functions to be used as ConfigSource. |
| 19 | +type ConfigSourceFunc func(*ConfigManager) error |
| 20 | + |
| 21 | +// Apply executes the underlying function. |
| 22 | +func (f ConfigSourceFunc) Apply(cm *ConfigManager) error { return f(cm) } |
| 23 | + |
| 24 | +// YAMLFileSource loads configuration values from a YAML file. |
| 25 | +type YAMLFileSource struct { |
| 26 | + Path string |
| 27 | +} |
| 28 | + |
| 29 | +// Apply reads and merges YAML content into the manager. |
| 30 | +func (s YAMLFileSource) Apply(cm *ConfigManager) error { |
| 31 | + if strings.TrimSpace(s.Path) == "" { |
| 32 | + return errors.New("config: YAML path is empty") |
| 33 | + } |
| 34 | + |
| 35 | + data, err := os.ReadFile(s.Path) |
| 36 | + if err != nil { |
| 37 | + return err |
| 38 | + } |
| 39 | + |
| 40 | + var fileCfg ConfigManager |
| 41 | + if err := yaml.Unmarshal(data, &fileCfg); err != nil { |
| 42 | + return fmt.Errorf("config: unmarshal %s: %w", s.Path, err) |
| 43 | + } |
| 44 | + |
| 45 | + cm.mergeConfigModules(&fileCfg) |
| 46 | + cm.mergeUserConfig(fileCfg.User) |
| 47 | + cm.mergeSimpleFields(&fileCfg) |
| 48 | + return nil |
| 49 | +} |
| 50 | + |
| 51 | +type envOverride struct { |
| 52 | + key string |
| 53 | + apply func(string, *ConfigManager) error |
| 54 | +} |
| 55 | + |
| 56 | +// EnvSource mutates configuration using environment variables. |
| 57 | +type EnvSource struct { |
| 58 | + overrides []envOverride |
| 59 | + lookup func(string) string |
| 60 | +} |
| 61 | + |
| 62 | +// NewDefaultEnvSource returns the built-in environment overrides. |
| 63 | +func NewDefaultEnvSource() EnvSource { |
| 64 | + return EnvSource{ |
| 65 | + overrides: []envOverride{ |
| 66 | + {key: "PORT", apply: applyPortOverride}, |
| 67 | + {key: "DATA_PATH", apply: applyDataPathOverride}, |
| 68 | + {key: "ENABLE_MCP_SERVER", apply: applyMCPEnabledOverride}, |
| 69 | + {key: "MCP_PORT", apply: applyMCPPortOverride}, |
| 70 | + {key: "MCP_HOST", apply: applyMCPHostOverride}, |
| 71 | + }, |
| 72 | + } |
| 73 | +} |
| 74 | + |
| 75 | +// Apply applies every configured override. |
| 76 | +func (s EnvSource) Apply(cm *ConfigManager) error { |
| 77 | + lookup := s.lookup |
| 78 | + if lookup == nil { |
| 79 | + lookup = os.Getenv |
| 80 | + } |
| 81 | + |
| 82 | + var errs []error |
| 83 | + for _, override := range s.overrides { |
| 84 | + if value := lookup(override.key); value != "" { |
| 85 | + if err := override.apply(value, cm); err != nil { |
| 86 | + errs = append(errs, fmt.Errorf("%s: %w", override.key, err)) |
| 87 | + } |
| 88 | + } |
| 89 | + } |
| 90 | + |
| 91 | + return errors.Join(errs...) |
| 92 | +} |
| 93 | + |
| 94 | +func applyPortOverride(val string, cm *ConfigManager) error { |
| 95 | + port, err := strconv.Atoi(val) |
| 96 | + if err != nil { |
| 97 | + return fmt.Errorf("invalid port %q", val) |
| 98 | + } |
| 99 | + cm.Base.Port = port |
| 100 | + return nil |
| 101 | +} |
| 102 | + |
| 103 | +func applyDataPathOverride(val string, cm *ConfigManager) error { |
| 104 | + if strings.TrimSpace(val) == "" { |
| 105 | + return errors.New("data path cannot be blank") |
| 106 | + } |
| 107 | + cm.Base.DataPath = val |
| 108 | + return nil |
| 109 | +} |
| 110 | + |
| 111 | +func applyMCPEnabledOverride(val string, cm *ConfigManager) error { |
| 112 | + enabled, err := parseBool(val) |
| 113 | + if err != nil { |
| 114 | + return err |
| 115 | + } |
| 116 | + if enabled { |
| 117 | + cm.MCP.EnableMCPServer = 1 |
| 118 | + } else { |
| 119 | + cm.MCP.EnableMCPServer = 0 |
| 120 | + } |
| 121 | + return nil |
| 122 | +} |
| 123 | + |
| 124 | +func applyMCPPortOverride(val string, cm *ConfigManager) error { |
| 125 | + cm.MCP.MCPPort = val |
| 126 | + return nil |
| 127 | +} |
| 128 | + |
| 129 | +func applyMCPHostOverride(val string, cm *ConfigManager) error { |
| 130 | + cm.MCP.MCPHost = val |
| 131 | + return nil |
| 132 | +} |
| 133 | + |
| 134 | +func parseBool(val string) (bool, error) { |
| 135 | + switch strings.ToLower(strings.TrimSpace(val)) { |
| 136 | + case "1", "true", "t", "yes", "y": |
| 137 | + return true, nil |
| 138 | + case "0", "false", "f", "no", "n": |
| 139 | + return false, nil |
| 140 | + default: |
| 141 | + return false, fmt.Errorf("invalid boolean value %q", val) |
| 142 | + } |
| 143 | +} |
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