mirror of
https://github.com/TwiN/gatus.git
synced 2024-12-05 14:20:45 +01:00
174 lines
3.9 KiB
Go
174 lines
3.9 KiB
Go
// Copyright 2017 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package compiler
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import (
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"errors"
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"fmt"
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"gopkg.in/yaml.v2"
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"io/ioutil"
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"log"
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"net/http"
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"net/url"
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"path/filepath"
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"strings"
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)
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var fileCache map[string][]byte
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var infoCache map[string]interface{}
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var count int64
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var verboseReader = false
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func initializeFileCache() {
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if fileCache == nil {
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fileCache = make(map[string][]byte, 0)
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}
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}
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func initializeInfoCache() {
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if infoCache == nil {
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infoCache = make(map[string]interface{}, 0)
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}
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}
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// FetchFile gets a specified file from the local filesystem or a remote location.
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func FetchFile(fileurl string) ([]byte, error) {
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initializeFileCache()
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bytes, ok := fileCache[fileurl]
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if ok {
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if verboseReader {
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log.Printf("Cache hit %s", fileurl)
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}
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return bytes, nil
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}
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if verboseReader {
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log.Printf("Fetching %s", fileurl)
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}
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response, err := http.Get(fileurl)
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if err != nil {
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return nil, err
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}
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if response.StatusCode != 200 {
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return nil, errors.New(fmt.Sprintf("Error downloading %s: %s", fileurl, response.Status))
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}
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defer response.Body.Close()
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bytes, err = ioutil.ReadAll(response.Body)
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if err == nil {
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fileCache[fileurl] = bytes
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}
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return bytes, err
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}
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// ReadBytesForFile reads the bytes of a file.
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func ReadBytesForFile(filename string) ([]byte, error) {
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// is the filename a url?
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fileurl, _ := url.Parse(filename)
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if fileurl.Scheme != "" {
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// yes, fetch it
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bytes, err := FetchFile(filename)
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if err != nil {
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return nil, err
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}
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return bytes, nil
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}
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// no, it's a local filename
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bytes, err := ioutil.ReadFile(filename)
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if err != nil {
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return nil, err
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}
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return bytes, nil
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}
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// ReadInfoFromBytes unmarshals a file as a yaml.MapSlice.
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func ReadInfoFromBytes(filename string, bytes []byte) (interface{}, error) {
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initializeInfoCache()
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cachedInfo, ok := infoCache[filename]
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if ok {
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if verboseReader {
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log.Printf("Cache hit info for file %s", filename)
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}
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return cachedInfo, nil
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}
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if verboseReader {
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log.Printf("Reading info for file %s", filename)
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}
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var info yaml.MapSlice
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err := yaml.Unmarshal(bytes, &info)
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if err != nil {
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return nil, err
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}
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infoCache[filename] = info
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return info, nil
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}
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// ReadInfoForRef reads a file and return the fragment needed to resolve a $ref.
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func ReadInfoForRef(basefile string, ref string) (interface{}, error) {
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initializeInfoCache()
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{
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info, ok := infoCache[ref]
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if ok {
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if verboseReader {
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log.Printf("Cache hit for ref %s#%s", basefile, ref)
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}
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return info, nil
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}
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}
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if verboseReader {
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log.Printf("Reading info for ref %s#%s", basefile, ref)
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}
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count = count + 1
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basedir, _ := filepath.Split(basefile)
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parts := strings.Split(ref, "#")
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var filename string
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if parts[0] != "" {
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filename = basedir + parts[0]
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} else {
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filename = basefile
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}
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bytes, err := ReadBytesForFile(filename)
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if err != nil {
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return nil, err
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}
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info, err := ReadInfoFromBytes(filename, bytes)
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if err != nil {
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log.Printf("File error: %v\n", err)
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} else {
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if len(parts) > 1 {
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path := strings.Split(parts[1], "/")
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for i, key := range path {
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if i > 0 {
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m, ok := info.(yaml.MapSlice)
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if ok {
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found := false
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for _, section := range m {
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if section.Key == key {
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info = section.Value
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found = true
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}
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}
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if !found {
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infoCache[ref] = nil
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return nil, NewError(nil, fmt.Sprintf("could not resolve %s", ref))
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}
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}
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}
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}
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}
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}
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infoCache[ref] = info
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return info, nil
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}
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