9605b5edf2
Its easier to let each datasource grab all metadata in the FetchMetadata stage than to break it into multiple stages.
115 lines
3.3 KiB
Go
115 lines
3.3 KiB
Go
// 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 ec2
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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"
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"strings"
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"github.com/coreos/coreos-cloudinit/datasource"
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"github.com/coreos/coreos-cloudinit/datasource/metadata"
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"github.com/coreos/coreos-cloudinit/pkg"
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)
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const (
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DefaultAddress = "http://169.254.169.254/"
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apiVersion = "2009-04-04/"
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userdataPath = apiVersion + "user-data"
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metadataPath = apiVersion + "meta-data"
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)
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type metadataService struct {
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metadata.MetadataService
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}
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func NewDatasource(root string) *metadataService {
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return &metadataService{metadata.NewDatasource(root, apiVersion, userdataPath, metadataPath)}
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}
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func (ms metadataService) FetchMetadata() (datasource.Metadata, error) {
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metadata := datasource.Metadata{}
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if keynames, err := ms.fetchAttributes(fmt.Sprintf("%s/public-keys", ms.MetadataUrl())); err == nil {
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keyIDs := make(map[string]string)
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for _, keyname := range keynames {
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tokens := strings.SplitN(keyname, "=", 2)
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if len(tokens) != 2 {
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return metadata, fmt.Errorf("malformed public key: %q", keyname)
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}
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keyIDs[tokens[1]] = tokens[0]
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}
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metadata.SSHPublicKeys = map[string]string{}
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for name, id := range keyIDs {
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sshkey, err := ms.fetchAttribute(fmt.Sprintf("%s/public-keys/%s/openssh-key", ms.MetadataUrl(), id))
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if err != nil {
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return metadata, err
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}
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metadata.SSHPublicKeys[name] = sshkey
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fmt.Printf("Found SSH key for %q\n", name)
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}
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if hostname, err := ms.fetchAttribute(fmt.Sprintf("%s/hostname", ms.MetadataUrl())); err == nil {
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metadata.Hostname = strings.Split(hostname, " ")[0]
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if localAddr, err := ms.fetchAttribute(fmt.Sprintf("%s/local-ipv4", ms.MetadataUrl())); err == nil {
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metadata.PrivateIPv4 = net.ParseIP(localAddr)
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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if publicAddr, err := ms.fetchAttribute(fmt.Sprintf("%s/public-ipv4", ms.MetadataUrl())); err == nil {
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metadata.PublicIPv4 = net.ParseIP(publicAddr)
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} else if _, ok := err.(pkg.ErrNotFound); !ok {
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return metadata, err
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}
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return metadata, nil
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}
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func (ms metadataService) Type() string {
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return "ec2-metadata-service"
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}
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func (ms metadataService) fetchAttributes(url string) ([]string, error) {
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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 metadataService) fetchAttribute(url string) (string, error) {
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if attrs, err := ms.fetchAttributes(url); err == nil && len(attrs) > 0 {
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return attrs[0], nil
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} else {
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return "", err
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}
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}
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