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client.go
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client.go
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package ews
import (
"context"
"encoding/xml"
"fmt"
"io/ioutil"
"net/http"
"time"
"github.com/Abovo-Media/go-ews/ewsxml"
"github.com/go-pogo/errors"
"github.com/go-pogo/writing"
)
type Version = ewsxml.Version
//goland:noinspection GoUnusedConst,GoSnakeCaseUsage
const (
Exchange2010 Version = "Exchange2010"
Exchange2013 Version = "Exchange2013"
Exchange2013_SP1 Version = "Exchange2013_SP1"
RequestError errors.Kind = "request error"
UnmarshalError errors.Kind = "unmarshal error"
)
type Requester interface {
// Request
// Argument out must be of type []byte or any type that xml.Marshal
// successfully can handle.
Request(req *Request, out interface{}) error
}
type Client struct {
Config
log Logger
http *http.Client
}
func NewClient(url string, ver Version, opts ...Option) (*Client, error) {
c := &Client{
log: NopLogger(),
http: &http.Client{
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
Timeout: time.Second * 10,
},
Config: Config{
Url: url,
Version: ver,
Retries: DefaultRetries,
RetrySleep: DefaultRetrySleep,
},
}
if err := c.applyOptions(opts); err != nil {
return nil, err
}
c.log.NewClient(c.Config)
return c, nil
}
func (c *Client) applyOptions(opts []Option) error {
var err error
for _, opt := range opts {
errors.Append(&err, opt.apply(c))
}
return err
}
var bufPool = writing.NewBytesBufferPool(512)
func (c *Client) Do(req *Request) (*http.Response, error) {
if req.head.ServerVersion() == "" {
req.head.WithServerVersion(c.Version)
}
body := bufPool.Get()
defer bufPool.Put(body)
if _, err := req.WriteTo(body); err != nil {
return nil, err
}
httpReq, err := http.NewRequestWithContext(req.ctx, http.MethodPost, c.Url, body)
if err != nil {
return nil, errors.WithStack(err)
}
if c.Username != "" && c.Password != "" {
if _, _, has := httpReq.BasicAuth(); !has {
httpReq.SetBasicAuth(c.Username, c.Password)
}
}
httpReq.Header.Set("Content-Type", "text/xml")
c.log.HttpRequest(req.ctx, httpReq, body.Bytes())
var httpResp *http.Response
var attempt uint8
sleep := c.RetrySleep
for {
attempt++
httpResp, err = c.do(context.WithValue(req.ctx, attemptKey{}, attempt), httpReq)
if err == nil && httpResp.StatusCode == http.StatusOK {
return httpResp, nil
}
if attempt >= c.Retries {
break
}
time.Sleep(sleep)
sleep += sleep
}
return httpResp, err
}
func (c *Client) do(ctx context.Context, req *http.Request) (*http.Response, error) {
// todo: record metrics
resp, err := c.http.Do(req)
if err != nil {
return nil, errors.WithKind(err, RequestError)
}
c.log.HttpResponse(ctx, resp)
return resp, nil
}
func (c *Client) Request(req *Request, out interface{}) (err error) {
httpResp, err := c.Do(req)
if err != nil {
return err
}
defer errors.AppendFunc(&err, httpResp.Body.Close)
if httpResp.StatusCode != http.StatusOK {
errors.Append(&err, NewError(httpResp))
return err
}
data, err := ioutil.ReadAll(httpResp.Body)
if err != nil {
return errors.WithStack(err)
}
var resp ewsxml.ResponseEnvelope
if err = xml.Unmarshal(data, &resp); err != nil {
return errors.WithKind(err, UnmarshalError)
}
if b, ok := out.(*[]byte); ok {
// skip unmarshalling, return as raw bytes
*b = resp.Body.Response
return nil
}
// unmarshal raw response into the expected result
if err = xml.Unmarshal(resp.Body.Response, out); err != nil {
return errors.WithKind(err, UnmarshalError)
}
if resp, ok := out.(ewsxml.Response); ok {
c.log.Response(req.ctx, *resp.Response())
if err = newResponseError(resp.Response()); err != nil {
return errors.WithStack(err)
}
}
return nil
}
type ResponseError struct {
Response ewsxml.Response
}
func newResponseError(resp ewsxml.Response) error {
if resp.Response().ResponseClass != ewsxml.ResponseClass_Error {
return nil
}
return &ResponseError{Response: resp}
}
func (re *ResponseError) Error() string {
r := re.Response.Response()
return fmt.Sprintf("response error: %s: %s", r.ResponseCode, r.MessageText)
}