feat: add UInt64 scalar

gqlgen.yml

@@ -48,6 +48,9 @@ models:
       - github.com/99designs/gqlgen/graphql.Int
       - github.com/99designs/gqlgen/graphql.Int64
       - github.com/99designs/gqlgen/graphql.Int32
+  UInt64:
+    model:
+      - okp4/cosmos-faucet/pkg.UInt64
   Long:
     model:
       - github.com/99designs/gqlgen/graphql.Int64

pkg/scalar.go

@@ -1,22 +1,38 @@
 package pkg
 
 import (
-	"errors"
-	"io"
+    "errors"
+    "fmt"
+    "io"
 
-	"github.com/99designs/gqlgen/graphql"
+    "github.com/99designs/gqlgen/graphql"
 )
 
 func MarshalAddress(a string) graphql.Marshaler {
-	return graphql.WriterFunc(func(w io.Writer) {
-		_, _ = w.Write([]byte(a))
-	})
+    return graphql.WriterFunc(func(w io.Writer) {
+        _, _ = w.Write([]byte(a))
+    })
 }
 
 func UnmarshalAddress(v interface{}) (string, error) {
-	value, ok := v.(string)
-	if !ok {
-		return "", errors.New("address must be a string")
-	}
-	return value, nil
+    value, ok := v.(string)
+    if !ok {
+        return "", errors.New("address must be a string")
+    }
+    return value, nil
+}
+
+func MarshalUInt64(i uint64) graphql.Marshaler {
+    return graphql.WriterFunc(func(w io.Writer) {
+        _, _ = io.WriteString(w, fmt.Sprintf("%d", i))
+    })
+}
+
+func UnmarshalUInt64(v interface{}) (uint64, error) {
+    switch v := v.(type) {
+    case int:
+        return uint64(v), nil
+    default:
+        return 0, fmt.Errorf("%T is not an uint64", v)
+    }
 }