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| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "io/ioutil" |
| 6 | + "log" |
| 7 | + "net/http" |
| 8 | + "os" |
| 9 | + "path" |
| 10 | + "time" |
| 11 | +) |
| 12 | + |
| 13 | +const ( |
| 14 | + metaldataMetaDataURL = "http://metaldata/get/meta/" |
| 15 | + metaldataUserDataURL = "http://metaldata/get/user" |
| 16 | +) |
| 17 | + |
| 18 | +// ProviderMetaldata is the type implementing the Provider interface for Metaldata |
| 19 | +type ProviderMetaldata struct { |
| 20 | +} |
| 21 | + |
| 22 | +// NewMetalData returns a new ProviderMetaldata |
| 23 | +func NewMetalData() *ProviderMetaldata { |
| 24 | + return &ProviderMetaldata{} |
| 25 | +} |
| 26 | + |
| 27 | +func (p *ProviderMetaldata) String() string { |
| 28 | + return "metaldata" |
| 29 | +} |
| 30 | + |
| 31 | +// Probe checks if we are running on Metaldata |
| 32 | +func (p *ProviderMetaldata) Probe() bool { |
| 33 | + log.Println("Metaldata: Probing...") |
| 34 | + // Getting the hostname should always work... |
| 35 | + _, err := metaldataGet(metaldataMetaDataURL + "hostname") |
| 36 | + return (err == nil) |
| 37 | +} |
| 38 | + |
| 39 | +// Extract gets both the Metaldata specific and generic userdata |
| 40 | +func (p *ProviderMetaldata) Extract() ([]byte, error) { |
| 41 | + // Get host name. This must not fail |
| 42 | + hostname, err := metaldataGet(metaldataMetaDataURL + "hostname") |
| 43 | + if err != nil { |
| 44 | + return nil, err |
| 45 | + } |
| 46 | + err = ioutil.WriteFile(path.Join(ConfigPath, Hostname), hostname, 0644) |
| 47 | + if err != nil { |
| 48 | + return nil, fmt.Errorf("Metaldata: Failed to write hostname: %s", err) |
| 49 | + } |
| 50 | + |
| 51 | + // public ipv4 |
| 52 | + metaldataMetaGet("public-ipv4", "public_ipv4", 0644) |
| 53 | + |
| 54 | + // private ipv4 |
| 55 | + metaldataMetaGet("private-ipv4", "private_ipv4", 0644) |
| 56 | + |
| 57 | + // failure domain |
| 58 | + metaldataMetaGet("failure-domain", "failure_domain", 0644) |
| 59 | + |
| 60 | + // id |
| 61 | + metaldataMetaGet("machine-id", "machine_id", 0644) |
| 62 | + |
| 63 | + // type |
| 64 | + metaldataMetaGet("machine-type", "machine_type", 0644) |
| 65 | + |
| 66 | + // ssh |
| 67 | + if err := p.handleSSH(); err != nil { |
| 68 | + log.Printf("Metaldata: Failed to get ssh data: %s", err) |
| 69 | + } |
| 70 | + |
| 71 | + // Generic userdata |
| 72 | + userData, err := metaldataGet(metaldataUserDataURL) |
| 73 | + if err != nil { |
| 74 | + log.Printf("Metaldata: Failed to get user-data: %s", err) |
| 75 | + // This is not an error |
| 76 | + return nil, nil |
| 77 | + } |
| 78 | + return userData, nil |
| 79 | +} |
| 80 | + |
| 81 | +// lookup a value (lookupName) in Metaldata metaservice and store in given fileName |
| 82 | +func metaldataMetaGet(lookupName string, fileName string, fileMode os.FileMode) { |
| 83 | + if lookupValue, err := metaldataGet(metaldataMetaDataURL + lookupName); err == nil { |
| 84 | + // we got a value from the metadata server, now save to filesystem |
| 85 | + err = ioutil.WriteFile(path.Join(ConfigPath, fileName), lookupValue, fileMode) |
| 86 | + if err != nil { |
| 87 | + // we couldn't save the file for some reason |
| 88 | + log.Printf("Metaldata: Failed to write %s:%s %s", fileName, lookupValue, err) |
| 89 | + } |
| 90 | + } else { |
| 91 | + // we did not get a value back from the metadata server |
| 92 | + log.Printf("Metaldata: Failed to get %s: %s", lookupName, err) |
| 93 | + } |
| 94 | +} |
| 95 | + |
| 96 | +// metaldataGet requests and extracts the requested URL |
| 97 | +func metaldataGet(url string) ([]byte, error) { |
| 98 | + var client = &http.Client{ |
| 99 | + Timeout: time.Second * 2, |
| 100 | + } |
| 101 | + |
| 102 | + req, err := http.NewRequest("", url, nil) |
| 103 | + if err != nil { |
| 104 | + return nil, fmt.Errorf("Metaldata: http.NewRequest failed: %s", err) |
| 105 | + } |
| 106 | + |
| 107 | + resp, err := client.Do(req) |
| 108 | + if err != nil { |
| 109 | + return nil, fmt.Errorf("Metaldata: Could not contact metadata service: %s", err) |
| 110 | + } |
| 111 | + if resp.StatusCode != 200 { |
| 112 | + return nil, fmt.Errorf("Metaldata: Status not ok: %d", resp.StatusCode) |
| 113 | + } |
| 114 | + body, err := ioutil.ReadAll(resp.Body) |
| 115 | + if err != nil { |
| 116 | + return nil, fmt.Errorf("Metaldata: Failed to read http response: %s", err) |
| 117 | + } |
| 118 | + return body, nil |
| 119 | +} |
| 120 | + |
| 121 | +// SSH keys: |
| 122 | +func (p *ProviderMetaldata) handleSSH() error { |
| 123 | + sshKeys, err := metaldataGet(metaldataMetaDataURL + "authorized-keys") |
| 124 | + if err != nil { |
| 125 | + return fmt.Errorf("Failed to get sshKeys: %s", err) |
| 126 | + } |
| 127 | + |
| 128 | + if err := os.Mkdir(path.Join(ConfigPath, SSH), 0755); err != nil { |
| 129 | + return fmt.Errorf("Failed to create %s: %s", SSH, err) |
| 130 | + } |
| 131 | + |
| 132 | + err = ioutil.WriteFile(path.Join(ConfigPath, SSH, "authorized_keys"), sshKeys, 0600) |
| 133 | + if err != nil { |
| 134 | + return fmt.Errorf("Failed to write ssh keys: %s", err) |
| 135 | + } |
| 136 | + return nil |
| 137 | +} |
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