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key_client_util.go
86 lines (78 loc) · 2.34 KB
/
key_client_util.go
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// Copyright 2017 Monax Industries Limited
//
// 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.
package keys
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"github.com/hyperledger/burrow/logging"
)
// Monax-Keys server connects over http request-response structures
type HTTPResponse struct {
Response string
Error string
}
type Requester func(method string, args map[string]string) (response string, err error)
func DefaultRequester(rpcAddress string, logger *logging.Logger) Requester {
return func(method string, args map[string]string) (string, error) {
body, err := json.Marshal(args)
if err != nil {
return "", err
}
endpoint := fmt.Sprintf("%s/%s", rpcAddress, method)
logger.TraceMsg("Sending request to key server",
"key_server_endpoint", endpoint,
"request_body", string(body),
)
req, err := http.NewRequest("POST", endpoint, bytes.NewBuffer(body))
if err != nil {
return "", err
}
req.Header.Add("Content-Type", "application/json")
res, err := requestResponse(req)
if err != nil {
return "", fmt.Errorf("error calling monax-keys at %s: %s", endpoint, err.Error())
}
if res.Error != "" {
return "", fmt.Errorf("response error when calling monax-keys at %s: %s", endpoint, res.Error)
}
logger.TraceMsg("Received response from key server",
"endpoint", endpoint,
"request_body", string(body),
"response", res,
)
return res.Response, nil
}
}
func requestResponse(req *http.Request) (*HTTPResponse, error) {
client := new(http.Client)
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, fmt.Errorf(resp.Status)
}
bs, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
httpResponse := new(HTTPResponse)
if err := json.Unmarshal(bs, httpResponse); err != nil {
return nil, err
}
return httpResponse, nil
}