break up Generate

generate/parse.go

@@ -0,0 +1,52 @@
+package generate
+
+import (
+	"fmt"
+	"io/ioutil"
+
+	"github.com/vektah/gqlparser"
+	"github.com/vektah/gqlparser/ast"
+	"github.com/vektah/gqlparser/parser"
+	"github.com/vektah/gqlparser/validator"
+)
+
+func getSchema(filename string) (*ast.Schema, error) {
+	// TODO: IRL we have to get the schema from GraphQL (maybe we can generate
+	// that once we can bootstrap) where it comes as JSON, not SDL, so we have
+	// to convert (or add gqlparser support to convert)
+	text, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, fmt.Errorf("unreadable schema file %v: %v", filename, err)
+	}
+
+	schema, graphqlError := gqlparser.LoadSchema(
+		&ast.Source{Name: filename, Input: string(text)})
+	if graphqlError != nil {
+		return nil, fmt.Errorf("invalid schema file %v: %v",
+			filename, graphqlError)
+	}
+
+	return schema, nil
+}
+
+func getAndValidateQueries(filename string, schema *ast.Schema) (*ast.QueryDocument, error) {
+	text, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return nil, fmt.Errorf("unreadable query-spec file %v: %v", filename, err)
+	}
+
+	// The following is more or less gqlparser.LoadQuery, but we can provide a
+	// name so we might as well (and we break out the two errors).
+	document, graphqlError := parser.ParseQuery(
+		&ast.Source{Name: filename, Input: string(text)})
+	if graphqlError != nil { // ParseQuery returns type *graphql.Error, yuck
+		return nil, fmt.Errorf("invalid query-spec file %v: %v", filename, graphqlError)
+	}
+
+	graphqlErrors := validator.Validate(schema, document)
+	if graphqlErrors != nil {
+		return nil, fmt.Errorf("query-spec does not match schema: %v", graphqlErrors)
+	}
+
+	return document, nil
+}