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http.go
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http.go
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package client
import (
"bytes"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"reflect"
"strconv"
"strings"
"github.com/deis/deis/version"
)
// CreateHTTPClient creates a HTTP Client with proper SSL options.
func CreateHTTPClient(sslVerify bool) *http.Client {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: !sslVerify},
DisableKeepAlives: true,
}
return &http.Client{Transport: tr}
}
// Request makes a HTTP request on the controller.
func (c Client) Request(method string, path string, body []byte) (*http.Response, error) {
url := c.ControllerURL
if strings.Contains(path, "?") {
parts := strings.Split(path, "?")
url.Path = parts[0]
url.RawQuery = parts[1]
} else {
url.Path = path
}
req, err := http.NewRequest(method, url.String(), bytes.NewBuffer(body))
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", "application/json")
if c.Token != "" {
req.Header.Add("Authorization", "token "+c.Token)
}
addUserAgent(&req.Header)
res, err := c.HTTPClient.Do(req)
if err != nil {
return nil, err
}
if err = checkForErrors(res, ""); err != nil {
return nil, err
}
checkAPICompatibility(res.Header.Get("DEIS_API_VERSION"))
return res, nil
}
// LimitedRequest allows limiting the number of responses in a request.
func (c Client) LimitedRequest(path string, results int) (string, int, error) {
body, err := c.BasicRequest("GET", path+"?page_size="+strconv.Itoa(results), nil)
if err != nil {
return "", -1, err
}
res := make(map[string]interface{})
if err = json.Unmarshal([]byte(body), &res); err != nil {
return "", -1, err
}
out, err := json.Marshal(res["results"].([]interface{}))
if err != nil {
return "", -1, err
}
return string(out), int(res["count"].(float64)), nil
}
// BasicRequest makes a simple http request on the controller.
func (c Client) BasicRequest(method string, path string, body []byte) (string, error) {
res, err := c.Request(method, path, body)
if err != nil {
return "", err
}
defer res.Body.Close()
resBody, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
return string(resBody), checkForErrors(res, string(resBody))
}
func checkForErrors(res *http.Response, body string) error {
// If response is not an error, return nil.
if res.StatusCode > 199 && res.StatusCode < 400 {
return nil
}
// Read the response body if none was provided.
if body == "" {
defer res.Body.Close()
resBody, err := ioutil.ReadAll(res.Body)
if err != nil {
return err
}
body = string(resBody)
}
// Unmarshal the response as JSON, or return the status and body.
bodyMap := make(map[string]interface{})
if err := json.Unmarshal([]byte(body), &bodyMap); err != nil {
return fmt.Errorf("\n%s\n%s\n", res.Status, body)
}
errorMessage := fmt.Sprintf("\n%s\n", res.Status)
for key, value := range bodyMap {
switch v := value.(type) {
case string:
errorMessage += fmt.Sprintf("%s: %s\n", key, v)
case []interface{}:
for _, subValue := range v {
switch sv := subValue.(type) {
case string:
errorMessage += fmt.Sprintf("%s: %s\n", key, sv)
default:
fmt.Printf("Unexpected type in %s error message array. Contents: %v",
reflect.TypeOf(value), sv)
}
}
default:
fmt.Printf("Cannot handle key %s in error message, type %s. Contents: %v",
key, reflect.TypeOf(value), bodyMap[key])
}
}
return errors.New(errorMessage)
}
// CheckConnection checks that the user is connected to a network and the URL points to a valid controller.
func CheckConnection(client *http.Client, controllerURL url.URL) error {
errorMessage := `%s does not appear to be a valid Deis controller.
Make sure that the Controller URI is correct and the server is running.`
baseURL := controllerURL.String()
controllerURL.Path = "/v1/"
req, err := http.NewRequest("GET", controllerURL.String(), bytes.NewBuffer(nil))
addUserAgent(&req.Header)
if err != nil {
return err
}
res, err := client.Do(req)
if err != nil {
fmt.Printf(errorMessage+"\n", baseURL)
return err
}
defer res.Body.Close()
if res.StatusCode != 401 {
return fmt.Errorf(errorMessage, baseURL)
}
checkAPICompatibility(res.Header.Get("DEIS_API_VERSION"))
return nil
}
func addUserAgent(headers *http.Header) {
headers.Add("User-Agent", "Deis Client v"+version.Version)
}