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client.go
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client.go
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package hetzner
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/http/httputil"
"net/url"
"sort"
"strconv"
"strings"
"time"
"github.com/cenkalti/backoff"
"github.com/google/go-querystring/query"
)
const (
// Version of this libary
Version = "0.1.0"
// User agent for this library
UserAgent = "appscode/" + Version
// DefaultEndpoint to be used
DefaultEndpoint = "https://robot-ws.your-server.de"
mediaType = "application/json"
)
type Client struct {
// HTTP client used to communicate with Hertzner API.
client *http.Client
// Base URL for API requests.
BaseURL string
// User agent for client
UserAgent string
// Debug will dump http request and response
Debug bool
headers map[string]string
b backoff.BackOff
Boot BootService
Ordering OrderingService
Reset ResetService
Server ServerService
SSHKey SSHKeyService
VServer VServerService
}
func NewClient(username, password string) *Client {
c := &Client{}
c.client = &http.Client{Timeout: time.Second * 10}
c.BaseURL = DefaultEndpoint
c.headers = map[string]string{
"Authorization": "Basic " + base64.StdEncoding.EncodeToString([]byte(username+":"+password)),
}
c.UserAgent = UserAgent
c.b = NewExponentialBackOff()
c.Boot = &BootServiceImpl{client: c}
c.Ordering = &OrderingServiceImpl{client: c}
c.Reset = &ResetServiceImpl{client: c}
c.Server = &ServerServiceImpl{client: c}
c.SSHKey = &SSHKeyServiceImpl{client: c}
c.VServer = &VServerServiceImpl{client: c}
return c
}
func (c *Client) WithUserAgent(ua string) *Client {
c.UserAgent = ua
return c
}
func (c *Client) WithBackOff(b backoff.BackOff) *Client {
c.b = b
return c
}
func (c *Client) WithTimeout(timeout time.Duration) *Client {
c.client.Timeout = timeout
return c
}
// NewRequest creates an API request. A relative URL can be provided in urlStr, which will be resolved to the BaseURL
// of the Client. If specified, the value pointed to by request is www-form-urlencoded and included in as the request body.
func (c *Client) NewRequest(method, path string, request interface{}) (*http.Request, error) {
var u *url.URL
var err error
if c.BaseURL != "" {
u, err = url.Parse(c.BaseURL)
if err != nil {
return nil, err
}
}
qv, err := query.Values(request)
if err != nil {
return nil, err
}
qs := encode(qv)
if qs != "" && method == http.MethodGet || method == http.MethodDelete {
if strings.Contains(path, "?") {
path += "&" + qs
} else {
path += "?" + qs
}
}
if path != "" {
rel, err := url.Parse(path)
if err != nil {
return nil, err
}
if u != nil {
u = u.ResolveReference(rel)
} else {
u = rel
}
}
if u == nil {
return nil, errors.New("No URL is provided.")
}
req, err := http.NewRequest(method, u.String(), bytes.NewBufferString(qs))
if err != nil {
return nil, err
}
req.Header.Add("Accept", "application/json")
req.Header.Add("User-Agent", c.UserAgent)
for k, v := range c.headers {
req.Header.Add(k, v)
}
if method == http.MethodPost || method == http.MethodPut {
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
req.Header.Add("Content-Length", strconv.Itoa(len(qs)))
}
if c.Debug {
dump, err := httputil.DumpRequestOut(req, true)
if err == nil {
fmt.Println(string(dump))
}
}
return req, nil
}
// Do sends an API request and returns the API response. The API response is JSON decoded and stored in the value
// pointed to by v, or returned as an error if an API error has occurred.
func (c *Client) Do(req *http.Request, v interface{}) (*http.Response, error) {
var resp *http.Response
var err error
if c.Debug {
fmt.Println(req.URL.String())
}
err = backoff.Retry(func() error {
resp, err = c.client.Do(req)
if err != nil {
return err
}
if c := resp.StatusCode; c == 500 || c >= 502 && c <= 599 {
// Avoid retry on 501: Not Implemented
err = &status5xx{}
}
return err
}, c.b)
c.b.Reset()
if err != nil {
if _, ok := err.(*status5xx); !ok {
return nil, err
}
}
if c.Debug {
dump, err := httputil.DumpResponse(resp, true)
if err == nil {
fmt.Println(string(dump))
}
}
defer func() {
if rerr := resp.Body.Close(); err == nil {
err = rerr
}
}()
err = checkResponse(resp)
if err != nil {
return resp, err
}
if v != nil {
//bb, _ := ioutil.ReadAll(resp.Body)
//fmt.Println(string(bb))
//
//err := json.Unmarshal(bb, v)
//if err != nil {
// return nil, err
//}
err = json.NewDecoder(resp.Body).Decode(v)
if err != nil {
return nil, err
}
}
return resp, err
}
type status5xx struct {
}
func (r *status5xx) Error() string {
return "5xx Server Error"
}
// CheckResponse checks the API response for errors, and returns them if present. A response is considered an
// error if it has a status code outside the 200 range. API error responses are expected to have either no response
// body, or a JSON response body that maps to APIError.
func checkResponse(r *http.Response) error {
if c := r.StatusCode; c >= 200 && c <= 299 {
return nil
}
apiErr := &APIError{Response: r}
data, err := ioutil.ReadAll(r.Body)
if err == nil && len(data) > 0 {
type E struct {
Error *APIError `json:"error"`
}
e := E{}
if err = json.Unmarshal(data, &e); err == nil {
e.Error.Response = r
apiErr = e.Error
}
}
return apiErr
}
func (c *Client) Call(method, path string, reqBody, resType interface{}, needAuth bool) (*http.Response, error) {
req, err := c.NewRequest(method, path, reqBody)
if err != nil {
return nil, err
}
if !needAuth {
req.Header.Del("Authorization")
}
return c.Do(req, resType)
}
// Encode encodes the values into ``URL encoded'' form
// ("bar=baz&foo=quux") sorted by key.
// Unlike std lib, this avoid escaping keys.
func encode(v url.Values) string {
if v == nil {
return ""
}
var buf bytes.Buffer
keys := make([]string, 0, len(v))
for k := range v {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
vs := v[k]
prefix := k + "=" // QueryEscape(k)
for _, v := range vs {
if buf.Len() > 0 {
buf.WriteByte('&')
}
buf.WriteString(prefix)
buf.WriteString(url.QueryEscape(v))
}
}
return buf.String()
}