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Signed-off-by: Michael Aldridge <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "path" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| metaldataMetaDataURL = "http://metaldata/get/meta/" | ||
| metaldataUserDataURL = "http://metaldata/get/user" | ||
| ) | ||
|
|
||
| // ProviderMetaldata is the type implementing the Provider interface for Metaldata | ||
| type ProviderMetaldata struct { | ||
| } | ||
|
|
||
| // NewMetalData returns a new ProviderMetaldata | ||
| func NewMetalData() *ProviderMetaldata { | ||
| return &ProviderMetaldata{} | ||
| } | ||
|
|
||
| func (p *ProviderMetaldata) String() string { | ||
| return "metaldata" | ||
| } | ||
|
|
||
| // Probe checks if we are running on Metaldata | ||
| func (p *ProviderMetaldata) Probe() bool { | ||
| log.Println("Metaldata: Probing...") | ||
| // Getting the hostname should always work... | ||
| _, err := metaldataGet(metaldataMetaDataURL + "hostname") | ||
| return (err == nil) | ||
| } | ||
|
|
||
| // Extract gets both the Metaldata specific and generic userdata | ||
| func (p *ProviderMetaldata) Extract() ([]byte, error) { | ||
| // Get host name. This must not fail | ||
| hostname, err := metaldataGet(metaldataMetaDataURL + "hostname") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| err = ioutil.WriteFile(path.Join(ConfigPath, Hostname), hostname, 0644) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Metaldata: Failed to write hostname: %s", err) | ||
| } | ||
|
|
||
| // public ipv4 | ||
| metaldataMetaGet("public-ipv4", "public_ipv4", 0644) | ||
|
|
||
| // private ipv4 | ||
| metaldataMetaGet("private-ipv4", "private_ipv4", 0644) | ||
|
|
||
| // failure domain | ||
| metaldataMetaGet("failure-domain", "failure_domain", 0644) | ||
|
|
||
| // id | ||
| metaldataMetaGet("machine-id", "machine_id", 0644) | ||
|
|
||
| // type | ||
| metaldataMetaGet("machine-type", "machine_type", 0644) | ||
|
|
||
| // ssh | ||
| if err := p.handleSSH(); err != nil { | ||
| log.Printf("Metaldata: Failed to get ssh data: %s", err) | ||
| } | ||
|
|
||
| // Generic userdata | ||
| userData, err := metaldataGet(metaldataUserDataURL) | ||
| if err != nil { | ||
| log.Printf("Metaldata: Failed to get user-data: %s", err) | ||
| // This is not an error | ||
| return nil, nil | ||
| } | ||
| return userData, nil | ||
| } | ||
|
|
||
| // lookup a value (lookupName) in Metaldata metaservice and store in given fileName | ||
| func metaldataMetaGet(lookupName string, fileName string, fileMode os.FileMode) { | ||
| if lookupValue, err := metaldataGet(metaldataMetaDataURL + lookupName); err == nil { | ||
| // we got a value from the metadata server, now save to filesystem | ||
| err = ioutil.WriteFile(path.Join(ConfigPath, fileName), lookupValue, fileMode) | ||
| if err != nil { | ||
| // we couldn't save the file for some reason | ||
| log.Printf("Metaldata: Failed to write %s:%s %s", fileName, lookupValue, err) | ||
| } | ||
| } else { | ||
| // we did not get a value back from the metadata server | ||
| log.Printf("Metaldata: Failed to get %s: %s", lookupName, err) | ||
| } | ||
| } | ||
|
|
||
| // metaldataGet requests and extracts the requested URL | ||
| func metaldataGet(url string) ([]byte, error) { | ||
| var client = &http.Client{ | ||
| Timeout: time.Second * 2, | ||
| } | ||
|
|
||
| req, err := http.NewRequest("", url, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Metaldata: http.NewRequest failed: %s", err) | ||
| } | ||
|
|
||
| resp, err := client.Do(req) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Metaldata: Could not contact metadata service: %s", err) | ||
| } | ||
| if resp.StatusCode != 200 { | ||
| return nil, fmt.Errorf("Metaldata: Status not ok: %d", resp.StatusCode) | ||
| } | ||
| body, err := ioutil.ReadAll(resp.Body) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("Metaldata: Failed to read http response: %s", err) | ||
| } | ||
| return body, nil | ||
| } | ||
|
|
||
| // SSH keys: | ||
| func (p *ProviderMetaldata) handleSSH() error { | ||
| sshKeys, err := metaldataGet(metaldataMetaDataURL + "authorized-keys") | ||
| if err != nil { | ||
| return fmt.Errorf("Failed to get sshKeys: %s", err) | ||
| } | ||
|
|
||
| if err := os.Mkdir(path.Join(ConfigPath, SSH), 0755); err != nil { | ||
| return fmt.Errorf("Failed to create %s: %s", SSH, err) | ||
| } | ||
|
|
||
| err = ioutil.WriteFile(path.Join(ConfigPath, SSH, "authorized_keys"), sshKeys, 0600) | ||
| if err != nil { | ||
| return fmt.Errorf("Failed to write ssh keys: %s", err) | ||
| } | ||
| return nil | ||
| } |
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