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builder.go
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builder.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 (
"bytes"
"encoding/json"
"fmt"
"net/http"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/chai2010/qingcloud-go/pkg/logger"
"github.com/chai2010/qingcloud-go/pkg/request/data"
"github.com/golang/protobuf/jsonpb"
"github.com/golang/protobuf/proto"
)
// Builder is the request builder for QingCloud service.
type Builder struct {
parsedURL string
parsedProperties *map[string]string
parsedParams *map[string]string
operation *data.Operation
input interface{}
}
// BuildHTTPRequest builds http request with an operation and an input.
func (b *Builder) BuildHTTPRequest(o *data.Operation, i interface{}) (*http.Request, error) {
b.operation = o
b.input = i
err := b.parse()
if err != nil {
return nil, err
}
return b.build()
}
func (b *Builder) build() (*http.Request, error) {
httpRequest, err := http.NewRequest(b.operation.RequestMethod, b.parsedURL, nil)
if err != nil {
return nil, err
}
logger.Info(fmt.Sprintf(
"Built QingCloud request: [%d] %s",
StringToUnixInt(httpRequest.Header.Get("Date"), "RFC 822"),
httpRequest.URL.String()))
return httpRequest, nil
}
func (b *Builder) parse() error {
err := b.parseRequestProperties()
if err != nil {
return err
}
err = b.parseRequestParams()
if err != nil {
return err
}
err = b.parseRequestURL()
if err != nil {
return err
}
return nil
}
func (b *Builder) parseRequestProperties() error {
propertiesMap, err := protoMessageToMap(b.operation.Properties)
if err != nil {
return err
}
b.parsedProperties = &propertiesMap
return nil
}
func (b *Builder) parseRequestParams() error {
requestParams, err := protoMessageToMap(b.input)
if err != nil {
return err
}
requestParams["action"] = b.operation.APIName
b.parsedParams = &requestParams
return nil
}
func (b *Builder) parseRequestURL() error {
conf := b.operation.Config
endpoint := conf.Protocol + "://" + conf.Host + ":" + strconv.Itoa(conf.Port)
requestURI := regexp.MustCompile(`/+`).ReplaceAllString(conf.URI, "/")
b.parsedURL = endpoint + requestURI
if b.parsedParams != nil {
zone := (*b.parsedProperties)["zone"]
if zone != "" {
(*b.parsedParams)["zone"] = zone
}
paramsParts := []string{}
for key, value := range *b.parsedParams {
paramsParts = append(paramsParts, fmt.Sprintf("%s=%s", key, url.QueryEscape(value)))
}
joined := strings.Join(paramsParts, "&")
if joined != "" {
b.parsedURL += "?" + joined
}
}
return nil
}
func protoMessageToMap(msg interface{}) (m map[string]string, err error) {
defer func() {
if x := recover(); x != nil {
err = fmt.Errorf("protoMessageToMap failed: %v", x)
}
}()
d, err := encodeJson(msg)
if err != nil {
return nil, err
}
var mapx map[string]interface{}
if err := json.Unmarshal(d, &mapx); err != nil {
return nil, err
}
m = unpackMapXToMapString(mapx)
return m, nil
}
// X is oneof string/float64/[]interface/map[string]interface{}
func unpackMapXToMapString(mapx map[string]interface{}) map[string]string {
var m = map[string]string{}
for k, v := range mapx {
switch v := v.(type) {
case string:
m[k] = v
case float64:
m[k] = fmt.Sprintf("%v", v)
case []interface{}:
for i := 0; i < len(v); i++ {
ki := k + "." + strconv.Itoa(i+1)
switch vi := v[i].(type) {
case string:
m[ki] = vi
case float64:
m[ki] = fmt.Sprintf("%v", vi)
case map[string]interface{}:
for kk, vv := range unpackMapXToMapString(vi) {
m[ki+"."+kk] = vv
}
default:
// unreachable
}
}
case map[string]interface{}:
for kk, vv := range unpackMapXToMapString(v) {
m[k+"."+kk] = vv
}
default:
// unreachable
}
}
return m
}
func encodeJson(x interface{}) ([]byte, error) {
if x, ok := x.(proto.Message); ok {
jsonMarshaler := &jsonpb.Marshaler{
OrigName: true,
Indent: "",
}
var buf bytes.Buffer
err := jsonMarshaler.Marshal(&buf, x)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
return json.Marshal(x)
}