[config] Unmarshall YAML before validating it

This way consumers can use the validation function without needing to use Cosmo to directly read the file.

router/pkg/config/config.go

@@ -625,6 +625,10 @@ type Config struct {
 	PersistedOperationsConfig PersistedOperationsConfig `yaml:"persisted_operations"`
 }
 
+func (c *Config) Validate() error {
+	return validateConfig(c, JSONSchema)
+}
+
 type LoadResult struct {
 	Config        Config
 	DefaultLoaded bool
@@ -685,16 +689,14 @@ func LoadConfig(configFilePath string, envOverride string) (*LoadResult, error)
 
 		configFileBytes = []byte(configYamlData)
 
-		err = ValidateConfig(configFileBytes, JSONSchema)
-		if err != nil {
-			return nil, fmt.Errorf("router config validation error: %w", err)
-		}
-
-		// Unmarshal the final config
-
 		if err := yaml.Unmarshal(configFileBytes, &cfg.Config); err != nil {
 			return nil, err
 		}
+
+		err = cfg.Config.Validate()
+		if err != nil {
+			return nil, fmt.Errorf("router config validation error: %w", err)
+		}
 	}
 
 	// Post-process the config

router/pkg/config/json_schema.go

@@ -6,7 +6,6 @@ import (
 	"fmt"
 	"github.com/dustin/go-humanize"
 	"github.com/goccy/go-json"
-	"github.com/goccy/go-yaml"
 	"github.com/santhosh-tekuri/jsonschema/v6"
 	"golang.org/x/text/message"
 	"io/fs"
@@ -82,7 +81,7 @@ func goDurationVocab() *jsonschema.Vocabulary {
 			"properties": {
 				"minimum": {
 					"type": "string"
-				},	
+				},
 				"maximum": {
 					"type": "string"
 				}
@@ -217,7 +216,7 @@ func humanBytesVocab() *jsonschema.Vocabulary {
 			"properties": {
 				"minimum": {
 					"type": "string"
-				},	
+				},
 				"minimum": {
 					"type": "string"
 				}
@@ -286,18 +285,13 @@ var (
 	hostnameRegexRFC1123 = regexp.MustCompile(hostnameRegexStringRFC1123)
 )
 
-func ValidateConfig(yamlData []byte, schema []byte) error {
+func validateConfig(v *Config, schema []byte) error {
 	var s any
 	err := json.Unmarshal(schema, &s)
 	if err != nil {
 		return err
 	}
 
-	var v any
-	if err := yaml.Unmarshal(yamlData, &v); err != nil {
-		log.Fatal(err)
-	}
-
 	c := jsonschema.NewCompiler()
 	c.AssertFormat()
 	c.AssertVocabs()