Refactored binapi generator with message encoding

Change-Id: I5a6abb68b9d058866f94818169300e5c2fc43895
Signed-off-by: Ondrej Fabry <ofabry@cisco.com>

1 files changed, 111 insertions, 0 deletions

diff --git a/binapigen/vppapi/parser.go b/binapigen/vppapi/parser.go
new file mode 100644
index 0000000..312dd0e
--- /dev/null
+++ b/binapigen/vppapi/parser.go
@@ -0,0 +1,111 @@
+//  Copyright (c) 2020 Cisco and/or its affiliates.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at:
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+package vppapi
+
+import (
+	"fmt"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+)
+
+const (
+	DefaultAPIDir = "/usr/share/vpp/api"
+)
+
+const apifileSuffixJson = ".api.json"
+
+// FindFiles returns all input files located in specified directory
+func FindFiles(dir string, deep int) (paths []string, err error) {
+	entries, err := ioutil.ReadDir(dir)
+	if err != nil {
+		return nil, fmt.Errorf("reading directory %s failed: %v", dir, err)
+	}
+	for _, e := range entries {
+		if e.IsDir() && deep > 0 {
+			nestedDir := filepath.Join(dir, e.Name())
+			if nested, err := FindFiles(nestedDir, deep-1); err != nil {
+				return nil, err
+			} else {
+				paths = append(paths, nested...)
+			}
+		} else if strings.HasSuffix(e.Name(), apifileSuffixJson) {
+			paths = append(paths, filepath.Join(dir, e.Name()))
+		}
+	}
+	return paths, nil
+}
+
+func Parse() ([]*File, error) {
+	return ParseDir(DefaultAPIDir)
+}
+
+func ParseDir(apidir string) ([]*File, error) {
+	files, err := FindFiles(apidir, 1)
+	if err != nil {
+		return nil, err
+	}
+
+	logrus.Infof("found %d files in API dir %q", len(files), apidir)
+
+	var modules []*File
+
+	for _, file := range files {
+		module, err := ParseFile(file)
+		if err != nil {
+			return nil, err
+		}
+		modules = append(modules, module)
+	}
+
+	return modules, nil
+}
+
+// ParseFile parses API file contents and returns File.
+func ParseFile(apifile string) (*File, error) {
+	if !strings.HasSuffix(apifile, apifileSuffixJson) {
+		return nil, fmt.Errorf("unsupported file format: %q", apifile)
+	}
+
+	data, err := ioutil.ReadFile(apifile)
+	if err != nil {
+		return nil, fmt.Errorf("reading file %s failed: %v", apifile, err)
+	}
+
+	base := filepath.Base(apifile)
+	name := base[:strings.Index(base, ".")]
+
+	logf("parsing file %q", base)
+
+	module, err := ParseRaw(data)
+	if err != nil {
+		return nil, fmt.Errorf("parsing file %s failed: %v", base, err)
+	}
+	module.Name = name
+	module.Path = apifile
+
+	return module, nil
+}
+
+func ParseRaw(data []byte) (file *File, err error) {
+	file, err = parseJSON(data)
+	if err != nil {
+		return nil, err
+	}
+
+	return file, nil
+}