add convenience method to pull params from config

internal/config/config.go

@@ -1,14 +1,69 @@
 package config
 
+import (
+	"errors"
+)
+
 type Config struct {
 	Modules []ModuleConfig `json:"modules"`
 	Routes  []RouteConfig  `json:"routes"`
 }
 
+type Params map[string]any
+
+var (
+	ErrParamNotFound  = errors.New("not found")
+	ErrParamNotString = errors.New("not a string")
+	ErrParamNotNumber = errors.New("not a number")
+)
+
+func (p Params) GetString(key string) (string, error) {
+	value, ok := p[key]
+	if !ok {
+		return "", ErrParamNotFound
+	}
+
+	stringValue, ok := value.(string)
+	if !ok {
+		return "", ErrParamNotString
+	}
+	return stringValue, nil
+}
+
+func (p Params) GetInt(key string) (int, error) {
+	value, ok := p[key]
+	if !ok {
+		return 0, ErrParamNotFound
+	}
+
+	intValue, ok := value.(int)
+	if !ok {
+		floatValue, ok := value.(float64)
+		if !ok {
+			return 0, ErrParamNotNumber
+		}
+		intValue = int(floatValue)
+	}
+	return intValue, nil
+}
+
+func (p Params) GetBool(key string) (bool, error) {
+	value, ok := p[key]
+	if !ok {
+		return false, ErrParamNotFound
+	}
+
+	boolValue, ok := value.(bool)
+	if !ok {
+		return false, errors.New("not a bool")
+	}
+	return boolValue, nil
+}
+
 type ModuleConfig struct {
-	Id     string         `json:"id"`
-	Type   string         `json:"type"`
-	Params map[string]any `json:"params"`
+	Id     string `json:"id"`
+	Type   string `json:"type"`
+	Params Params `json:"params"`
 }
 
 type RouteConfig struct {
@@ -18,6 +73,6 @@ type RouteConfig struct {
 }
 
 type ProcessorConfig struct {
-	Type   string         `json:"type"`
-	Params map[string]any `json:"params"`
+	Type   string `json:"type"`
+	Params Params `json:"params"`
 }