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111 lines
2.7 KiB
Go
Executable File
111 lines
2.7 KiB
Go
Executable File
// Copyright 2015 CoreOS, Inc.
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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 metadata
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import (
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"bufio"
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"bytes"
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"fmt"
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"net/http"
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"strings"
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"github.com/rancher/os/config/cloudinit/pkg"
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"github.com/rancher/os/log"
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)
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type Service struct {
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Root string
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Client pkg.Getter
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APIVersion string
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UserdataPath string
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MetadataPath string
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lastError error
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}
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func NewDatasource(root, apiVersion, userdataPath, metadataPath string, header http.Header) Service {
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if !strings.HasSuffix(root, "/") {
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root += "/"
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}
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return Service{root, pkg.NewHTTPClientHeader(header), apiVersion, userdataPath, metadataPath, nil}
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}
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func (ms Service) IsAvailable() bool {
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_, ms.lastError = ms.Client.Get(ms.Root + ms.APIVersion)
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if ms.lastError != nil {
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log.Errorf("%s: %s (lastError: %s)", "IsAvailable", ms.Root+":"+ms.UserdataPath, ms.lastError)
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}
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return (ms.lastError == nil)
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}
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func (ms *Service) Finish() error {
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return nil
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}
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func (ms *Service) String() string {
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return fmt.Sprintf("%s: %s (lastError: %s)", "metadata", ms.Root+ms.UserdataPath, ms.lastError)
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}
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func (ms Service) AvailabilityChanges() bool {
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return true
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}
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func (ms Service) ConfigRoot() string {
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return ms.Root
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}
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func (ms Service) FetchUserdata() ([]byte, error) {
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return ms.FetchData(ms.UserdataURL())
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}
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func (ms Service) FetchData(url string) ([]byte, error) {
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if data, err := ms.Client.GetRetry(url); err == nil {
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return data, err
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} else if _, ok := err.(pkg.ErrNotFound); ok {
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return []byte{}, nil
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} else {
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return data, err
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}
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}
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func (ms Service) MetadataURL() string {
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return (ms.Root + ms.MetadataPath)
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}
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func (ms Service) UserdataURL() string {
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return (ms.Root + ms.UserdataPath)
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}
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func (ms Service) FetchAttributes(key string) ([]string, error) {
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url := ms.MetadataURL() + key
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resp, err := ms.FetchData(url)
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if err != nil {
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return nil, err
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}
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scanner := bufio.NewScanner(bytes.NewBuffer(resp))
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data := make([]string, 0)
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for scanner.Scan() {
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data = append(data, scanner.Text())
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}
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return data, scanner.Err()
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}
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func (ms Service) FetchAttribute(key string) (string, error) {
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attrs, err := ms.FetchAttributes(key)
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if err == nil && len(attrs) > 0 {
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return attrs[0], nil
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}
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return "", err
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}
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