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builder.go
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builder.go
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/*
* Copyright 2017 Baidu, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of the License 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.
*/
// builder.go - defines the RequestBuilder structure for BCE servies
package bce
import (
"encoding/json"
"fmt"
)
// RequestBuilder holds config data for bce request.
// Some of fields are required and the others are optional.
// The builder pattern can simplify the execution of requests.
type RequestBuilder struct {
client Client
url string // required
method string // required
queryParams map[string]string // optional
headers map[string]string // optional
body interface{} // optional
result interface{} // optional
}
// create RequestBuilder with the client.
func NewRequestBuilder(client Client) *RequestBuilder {
return &RequestBuilder{
client: client,
}
}
func (b *RequestBuilder) WithURL(url string) *RequestBuilder {
b.url = url
return b
}
func (b *RequestBuilder) WithMethod(method string) *RequestBuilder {
b.method = method
return b
}
// set query param with the key/value directly.
func (b *RequestBuilder) WithQueryParam(key, value string) *RequestBuilder {
if b.queryParams == nil {
b.queryParams = make(map[string]string)
}
b.queryParams[key] = value
return b
}
// set query param with the key/value only when the value is not blank.
func (b *RequestBuilder) WithQueryParamFilter(key, value string) *RequestBuilder {
if len(value) == 0 {
return b
}
return b.WithQueryParam(key, value)
}
func (b *RequestBuilder) WithQueryParams(params map[string]string) *RequestBuilder {
if b.queryParams == nil {
b.queryParams = params
} else {
for key, value := range params {
b.queryParams[key] = value
}
}
return b
}
func (b *RequestBuilder) WithHeader(key, value string) *RequestBuilder {
if b.headers == nil {
b.headers = make(map[string]string)
}
b.headers[key] = value
return b
}
func (b *RequestBuilder) WithHeaders(headers map[string]string) *RequestBuilder {
if b.headers == nil {
b.headers = headers
} else {
for key, value := range headers {
b.headers[key] = value
}
}
return b
}
func (b *RequestBuilder) WithBody(body interface{}) *RequestBuilder {
b.body = body
return b
}
func (b *RequestBuilder) WithResult(result interface{}) *RequestBuilder {
b.result = result
return b
}
// Do will send request to bce and get result with the builder's parameters.
func (b *RequestBuilder) Do() error {
if err := b.validate(); err != nil {
return err
}
// build BceRequest
req, err := b.buildBceRequest()
if err != nil {
return err
}
// get result from BceResponse
if err := b.buildBceResponse(req); err != nil {
return err
}
return nil
}
// Validate if the required fields are providered.
func (b *RequestBuilder) validate() error {
if len(b.url) == 0 {
return fmt.Errorf("The url can't be null.")
}
if len(b.method) == 0 {
return fmt.Errorf("The method can't be null.")
}
if b.client == nil {
return fmt.Errorf("The client can't be null.")
}
return nil
}
func (b *RequestBuilder) buildBceRequest() (*BceRequest, error) {
// Build the request
req := &BceRequest{}
req.SetUri(b.url)
req.SetMethod(b.method)
if b.headers != nil {
req.SetHeaders(b.headers)
}
if b.queryParams != nil {
req.SetParams(b.queryParams)
}
if b.body != nil {
bodyBytes, err := json.Marshal(b.body)
if err != nil {
return nil, err
}
body, err := NewBodyFromBytes(bodyBytes)
if err != nil {
return nil, err
}
req.SetBody(body)
}
return req, nil
}
func (b *RequestBuilder) buildBceResponse(req *BceRequest) error {
// Send request and get response
resp := &BceResponse{}
if err := b.client.SendRequest(req, resp); err != nil {
return err
}
if resp.IsFail() {
return resp.ServiceError()
}
defer resp.Body().Close()
if b.result == nil {
return nil
}
return resp.ParseJsonBody(b.result)
}