/
request.go
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/
request.go
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// +-------------------------------------------------------------------------
// | Copyright (C) 2016 Yunify, Inc.
// +-------------------------------------------------------------------------
// | Licensed under the Apache License, Version 2.0 (the "License");
// | you may not use this work except in compliance with the License.
// | You may obtain a copy of the License in the LICENSE file, or at:
// |
// | http://www.apache.org/licenses/LICENSE-2.0
// |
// | Unless required by applicable law or agreed to in writing, software
// | distributed under the License is distributed on an "AS IS" BASIS,
// | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// | See the License for the specific language governing permissions and
// | limitations under the License.
// +-------------------------------------------------------------------------
package request
import (
"errors"
"fmt"
"net/http"
"reflect"
"strconv"
"time"
"github.com/pengsrc/go-shared/convert"
"github.com/yunify/qingstor-sdk-go/logger"
"github.com/yunify/qingstor-sdk-go/request/builder"
"github.com/yunify/qingstor-sdk-go/request/data"
"github.com/yunify/qingstor-sdk-go/request/signer"
"github.com/yunify/qingstor-sdk-go/request/unpacker"
)
// A Request can build, sign, send and unpack API request.
type Request struct {
Operation *data.Operation
Input *reflect.Value
Output *reflect.Value
HTTPRequest *http.Request
HTTPResponse *http.Response
}
// New create a Request from given Operation, Input and Output.
// It returns a Request.
func New(o *data.Operation, i data.Input, x interface{}) (*Request, error) {
input := reflect.ValueOf(i)
if input.IsValid() && input.Elem().IsValid() {
err := i.Validate()
if err != nil {
return nil, err
}
}
output := reflect.ValueOf(x)
return &Request{
Operation: o,
Input: &input,
Output: &output,
}, nil
}
// Send sends API request.
// It returns error if error occurred.
func (r *Request) Send() error {
err := r.Build()
if err != nil {
return err
}
err = r.Sign()
if err != nil {
return err
}
err = r.Do()
if err != nil {
return err
}
return nil
}
// Build checks and builds the API request.
// It returns error if error occurred.
func (r *Request) Build() error {
err := r.check()
if err != nil {
return err
}
err = r.build()
if err != nil {
return err
}
return nil
}
// Do sends and unpacks the API request.
// It returns error if error occurred.
func (r *Request) Do() error {
err := r.send()
if err != nil {
return err
}
err = r.unpack()
if err != nil {
return err
}
return nil
}
// Sign sign the API request by setting the authorization header.
// It returns error if error occurred.
func (r *Request) Sign() error {
err := r.sign()
if err != nil {
return err
}
return nil
}
// SignQuery sign the API request by appending query string.
// It returns error if error occurred.
func (r *Request) SignQuery(timeoutSeconds int) error {
err := r.signQuery(int(time.Now().Unix()) + timeoutSeconds)
if err != nil {
return err
}
return nil
}
// ApplySignature applies the Authorization header.
// It returns error if error occurred.
func (r *Request) ApplySignature(authorization string) error {
r.HTTPRequest.Header.Set("Authorization", authorization)
return nil
}
// ApplyQuerySignature applies the query signature.
// It returns error if error occurred.
func (r *Request) ApplyQuerySignature(accessKeyID string, expires int, signature string) error {
queryValue := r.HTTPRequest.URL.Query()
queryValue.Set("access_key_id", accessKeyID)
queryValue.Set("expires", strconv.Itoa(expires))
queryValue.Set("signature", signature)
r.HTTPRequest.URL.RawQuery = queryValue.Encode()
return nil
}
func (r *Request) check() error {
if r.Operation.Config.AccessKeyID == "" {
return errors.New("access key not provided")
}
if r.Operation.Config.SecretAccessKey == "" {
return errors.New("secret access key not provided")
}
return nil
}
func (r *Request) build() error {
b := &builder.QingStorBuilder{}
httpRequest, err := b.BuildHTTPRequest(r.Operation, r.Input)
if err != nil {
return err
}
r.HTTPRequest = httpRequest
return nil
}
func (r *Request) sign() error {
s := &signer.QingStorSigner{
AccessKeyID: r.Operation.Config.AccessKeyID,
SecretAccessKey: r.Operation.Config.SecretAccessKey,
}
err := s.WriteSignature(r.HTTPRequest)
if err != nil {
return err
}
return nil
}
func (r *Request) signQuery(expires int) error {
s := &signer.QingStorSigner{
AccessKeyID: r.Operation.Config.AccessKeyID,
SecretAccessKey: r.Operation.Config.SecretAccessKey,
}
err := s.WriteQuerySignature(r.HTTPRequest, expires)
if err != nil {
return err
}
return nil
}
func (r *Request) send() error {
var response *http.Response
var err error
if r.Operation.Config.Connection == nil {
r.Operation.Config.InitHTTPClient()
}
retries := r.Operation.Config.ConnectionRetries + 1
for {
if retries > 0 {
logger.Infof(nil, fmt.Sprintf(
"Sending request: [%d] %s %s",
convert.StringToTimestamp(r.HTTPRequest.Header.Get("Date"), convert.RFC822),
r.Operation.RequestMethod,
r.HTTPRequest.Host,
))
response, err = r.Operation.Config.Connection.Do(r.HTTPRequest)
if err == nil {
retries = 0
} else {
retries--
time.Sleep(time.Second)
}
} else {
break
}
}
if err != nil {
return err
}
r.HTTPResponse = response
return nil
}
func (r *Request) unpack() error {
u := &unpacker.QingStorUnpacker{}
err := u.UnpackHTTPRequest(r.Operation, r.HTTPResponse, r.Output)
if err != nil {
return err
}
return nil
}