Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/github.com/googleapis/gnostic/compiler/reader.go b/vendor/github.com/googleapis/gnostic/compiler/reader.go
new file mode 100644
index 0000000..af10e0d
--- /dev/null
+++ b/vendor/github.com/googleapis/gnostic/compiler/reader.go
@@ -0,0 +1,209 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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 compiler
+
+import (
+ "errors"
+ "fmt"
+ "io/ioutil"
+ "log"
+ "net/http"
+ "net/url"
+ "path/filepath"
+ "strings"
+
+ yaml "gopkg.in/yaml.v2"
+)
+
+var fileCache map[string][]byte
+var infoCache map[string]interface{}
+var count int64
+
+var verboseReader = false
+var fileCacheEnable = true
+var infoCacheEnable = true
+
+func initializeFileCache() {
+ if fileCache == nil {
+ fileCache = make(map[string][]byte, 0)
+ }
+}
+
+func initializeInfoCache() {
+ if infoCache == nil {
+ infoCache = make(map[string]interface{}, 0)
+ }
+}
+
+func DisableFileCache() {
+ fileCacheEnable = false
+}
+
+func DisableInfoCache() {
+ infoCacheEnable = false
+}
+
+func RemoveFromFileCache(fileurl string) {
+ if !fileCacheEnable {
+ return
+ }
+ initializeFileCache()
+ delete(fileCache, fileurl)
+}
+
+func RemoveFromInfoCache(filename string) {
+ if !infoCacheEnable {
+ return
+ }
+ initializeInfoCache()
+ delete(infoCache, filename)
+}
+
+// FetchFile gets a specified file from the local filesystem or a remote location.
+func FetchFile(fileurl string) ([]byte, error) {
+ var bytes []byte
+ initializeFileCache()
+ if fileCacheEnable {
+ bytes, ok := fileCache[fileurl]
+ if ok {
+ if verboseReader {
+ log.Printf("Cache hit %s", fileurl)
+ }
+ return bytes, nil
+ }
+ if verboseReader {
+ log.Printf("Fetching %s", fileurl)
+ }
+ }
+ response, err := http.Get(fileurl)
+ if err != nil {
+ return nil, err
+ }
+ defer response.Body.Close()
+ if response.StatusCode != 200 {
+ return nil, errors.New(fmt.Sprintf("Error downloading %s: %s", fileurl, response.Status))
+ }
+ bytes, err = ioutil.ReadAll(response.Body)
+ if fileCacheEnable && err == nil {
+ fileCache[fileurl] = bytes
+ }
+ return bytes, err
+}
+
+// ReadBytesForFile reads the bytes of a file.
+func ReadBytesForFile(filename string) ([]byte, error) {
+ // is the filename a url?
+ fileurl, _ := url.Parse(filename)
+ if fileurl.Scheme != "" {
+ // yes, fetch it
+ bytes, err := FetchFile(filename)
+ if err != nil {
+ return nil, err
+ }
+ return bytes, nil
+ }
+ // no, it's a local filename
+ bytes, err := ioutil.ReadFile(filename)
+ if err != nil {
+ return nil, err
+ }
+ return bytes, nil
+}
+
+// ReadInfoFromBytes unmarshals a file as a yaml.MapSlice.
+func ReadInfoFromBytes(filename string, bytes []byte) (interface{}, error) {
+ initializeInfoCache()
+ if infoCacheEnable {
+ cachedInfo, ok := infoCache[filename]
+ if ok {
+ if verboseReader {
+ log.Printf("Cache hit info for file %s", filename)
+ }
+ return cachedInfo, nil
+ }
+ if verboseReader {
+ log.Printf("Reading info for file %s", filename)
+ }
+ }
+ var info yaml.MapSlice
+ err := yaml.Unmarshal(bytes, &info)
+ if err != nil {
+ return nil, err
+ }
+ if infoCacheEnable && len(filename) > 0 {
+ infoCache[filename] = info
+ }
+ return info, nil
+}
+
+// ReadInfoForRef reads a file and return the fragment needed to resolve a $ref.
+func ReadInfoForRef(basefile string, ref string) (interface{}, error) {
+ initializeInfoCache()
+ if infoCacheEnable {
+ info, ok := infoCache[ref]
+ if ok {
+ if verboseReader {
+ log.Printf("Cache hit for ref %s#%s", basefile, ref)
+ }
+ return info, nil
+ }
+ if verboseReader {
+ log.Printf("Reading info for ref %s#%s", basefile, ref)
+ }
+ }
+ count = count + 1
+ basedir, _ := filepath.Split(basefile)
+ parts := strings.Split(ref, "#")
+ var filename string
+ if parts[0] != "" {
+ filename = basedir + parts[0]
+ } else {
+ filename = basefile
+ }
+ bytes, err := ReadBytesForFile(filename)
+ if err != nil {
+ return nil, err
+ }
+ info, err := ReadInfoFromBytes(filename, bytes)
+ if err != nil {
+ log.Printf("File error: %v\n", err)
+ } else {
+ if len(parts) > 1 {
+ path := strings.Split(parts[1], "/")
+ for i, key := range path {
+ if i > 0 {
+ m, ok := info.(yaml.MapSlice)
+ if ok {
+ found := false
+ for _, section := range m {
+ if section.Key == key {
+ info = section.Value
+ found = true
+ }
+ }
+ if !found {
+ infoCache[ref] = nil
+ return nil, NewError(nil, fmt.Sprintf("could not resolve %s", ref))
+ }
+ }
+ }
+ }
+ }
+ }
+ if infoCacheEnable {
+ infoCache[ref] = info
+ }
+ return info, nil
+}