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client.go
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client.go
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package src
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"strings"
"github.com/pkg/errors"
)
//Client struct
type Client struct {
token string
basePath string
HTTPClient *http.Client
}
//NewClient creates new client
func NewClient(token string, client ...*http.Client) *Client {
return newClientInternal(
token,
"https://cloud-api.yandex.com/v1/disk", //also "https://cloud-api.yandex.net/v1/disk" "https://cloud-api.yandex.ru/v1/disk"
client...)
}
func newClientInternal(token string, basePath string, client ...*http.Client) *Client {
c := &Client{
token: token,
basePath: basePath,
}
if len(client) != 0 {
c.HTTPClient = client[0]
} else {
c.HTTPClient = http.DefaultClient
}
return c
}
//ErrorHandler type
type ErrorHandler func(*http.Response) error
var defaultErrorHandler ErrorHandler = func(resp *http.Response) error {
if resp.StatusCode/100 == 5 {
return errors.New("server error")
}
if resp.StatusCode/100 == 4 {
var response DiskClientError
contents, _ := ioutil.ReadAll(resp.Body)
err := json.Unmarshal(contents, &response)
if err != nil {
return err
}
return response
}
if resp.StatusCode/100 == 3 {
return errors.New("redirect error")
}
return nil
}
func (HTTPRequest *HTTPRequest) run(client *Client) ([]byte, error) {
var err error
values := make(url.Values)
for k, v := range HTTPRequest.Parameters {
values.Set(k, fmt.Sprintf("%v", v))
}
var req *http.Request
if HTTPRequest.Method == "POST" {
// TODO json serialize
req, err = http.NewRequest(
"POST",
client.basePath+HTTPRequest.Path,
strings.NewReader(values.Encode()))
if err != nil {
return nil, err
}
// TODO
// req.Header.Set("Content-Type", "application/json")
} else {
req, err = http.NewRequest(
HTTPRequest.Method,
client.basePath+HTTPRequest.Path+"?"+values.Encode(),
nil)
if err != nil {
return nil, err
}
}
for headerName := range HTTPRequest.Headers {
var headerValues = HTTPRequest.Headers[headerName]
for _, headerValue := range headerValues {
req.Header.Set(headerName, headerValue)
}
}
return runRequest(client, req)
}
func runRequest(client *Client, req *http.Request) ([]byte, error) {
return runRequestWithErrorHandler(client, req, defaultErrorHandler)
}
func runRequestWithErrorHandler(client *Client, req *http.Request, errorHandler ErrorHandler) (out []byte, err error) {
resp, err := client.HTTPClient.Do(req)
if err != nil {
return nil, err
}
defer CheckClose(resp.Body, &err)
return checkResponseForErrorsWithErrorHandler(resp, errorHandler)
}
func checkResponseForErrorsWithErrorHandler(resp *http.Response, errorHandler ErrorHandler) ([]byte, error) {
if resp.StatusCode/100 > 2 {
return nil, errorHandler(resp)
}
return ioutil.ReadAll(resp.Body)
}
// CheckClose is a utility function used to check the return from
// Close in a defer statement.
func CheckClose(c io.Closer, err *error) {
cerr := c.Close()
if *err == nil {
*err = cerr
}
}