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sdk.go
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sdk.go
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/*
* Copyright 2019 Insolar Technologies
*
* 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 sdk
import (
"context"
"encoding/json"
"io/ioutil"
"sync"
"github.com/insolar/insolar/api/requester"
"github.com/insolar/insolar/instrumentation/inslogger"
"github.com/insolar/insolar/platformpolicy"
"github.com/insolar/insolar/testutils"
"github.com/pkg/errors"
)
type response struct {
Error string
Result interface{}
TraceID string
}
type ringBuffer struct {
sync.Mutex
urls []string
cursor int
}
func (rb *ringBuffer) next() string {
rb.Lock()
defer rb.Unlock()
rb.cursor++
if rb.cursor >= len(rb.urls) {
rb.cursor = 0
}
return rb.urls[rb.cursor]
}
type memberKeys struct {
Private string `json:"private_key"`
Public string `json:"public_key"`
}
// SDK is used to send messages to API
type SDK struct {
apiURLs *ringBuffer
rootMember *requester.UserConfigJSON
}
// NewSDK creates insSDK object
func NewSDK(urls []string, rootMemberKeysPath string) (*SDK, error) {
buffer := &ringBuffer{urls: urls}
rawConf, err := ioutil.ReadFile(rootMemberKeysPath)
if err != nil {
return nil, errors.Wrap(err, "[ NewSDK ] can't read keys from file")
}
keys := memberKeys{}
err = json.Unmarshal(rawConf, &keys)
if err != nil {
return nil, errors.Wrap(err, "[ NewSDK ] can't unmarshal keys")
}
response, err := requester.Info(buffer.next())
if err != nil {
return nil, errors.Wrap(err, "[ NewSDK ] can't get info")
}
rootMember, err := requester.CreateUserConfig(response.RootMember, keys.Private)
if err != nil {
return nil, errors.Wrap(err, "[ NewSDK ] can't create user config")
}
return &SDK{
apiURLs: buffer,
rootMember: rootMember,
}, nil
}
func (sdk *SDK) sendRequest(ctx context.Context, method string, params []interface{}, userCfg *requester.UserConfigJSON) ([]byte, error) {
reqCfg := &requester.RequestConfigJSON{
Params: params,
Method: method,
}
body, err := requester.Send(ctx, sdk.apiURLs.next(), userCfg, reqCfg)
if err != nil {
return nil, errors.Wrap(err, "[ sendRequest ] can not send request")
}
return body, nil
}
func (sdk *SDK) getResponse(body []byte) (*response, error) {
res := &response{}
err := json.Unmarshal(body, &res)
if err != nil {
return nil, errors.Wrap(err, "[ getResponse ] problems with unmarshal response")
}
return res, nil
}
// CreateMember api request creates member with new random keys
func (sdk *SDK) CreateMember() (*Member, string, error) {
ctx := inslogger.ContextWithTrace(context.Background(), "CreateMember")
memberName := testutils.RandomString()
ks := platformpolicy.NewKeyProcessor()
privateKey, err := ks.GeneratePrivateKey()
if err != nil {
return nil, "", errors.Wrap(err, "[ CreateMember ] can't generate private key")
}
privateKeyStr, err := ks.ExportPrivateKeyPEM(privateKey)
if err != nil {
return nil, "", errors.Wrap(err, "[ CreateMember ] can't export private key")
}
memberPubKeyStr, err := ks.ExportPublicKeyPEM(ks.ExtractPublicKey(privateKey))
if err != nil {
return nil, "", errors.Wrap(err, "[ CreateMember ] can't extract public key")
}
params := []interface{}{memberName, string(memberPubKeyStr)}
body, err := sdk.sendRequest(ctx, "CreateMember", params, sdk.rootMember)
if err != nil {
return nil, "", errors.Wrap(err, "[ CreateMember ] can't send request")
}
response, err := sdk.getResponse(body)
if err != nil {
return nil, "", errors.Wrap(err, "[ CreateMember ] can't get response")
}
if response.Error != "" {
return nil, response.TraceID, errors.New(response.Error)
}
return NewMember(response.Result.(string), string(privateKeyStr)), response.TraceID, nil
}
// Transfer method send money from one member to another
func (sdk *SDK) Transfer(amount uint, from *Member, to *Member) (string, error) {
ctx := inslogger.ContextWithTrace(context.Background(), "Transfer")
params := []interface{}{amount, to.Reference}
config, err := requester.CreateUserConfig(from.Reference, from.PrivateKey)
if err != nil {
return "", errors.Wrap(err, "[ Transfer ] can't create user config")
}
body, err := sdk.sendRequest(ctx, "Transfer", params, config)
if err != nil {
return "", errors.Wrap(err, "[ Transfer ] can't send request")
}
response, err := sdk.getResponse(body)
if err != nil {
return "", errors.Wrap(err, "[ Transfer ] can't get response")
}
if response.Error != "" {
return response.TraceID, errors.New(response.Error)
}
return response.TraceID, nil
}
// GetBalance returns current balance of the given member.
func (sdk *SDK) GetBalance(m *Member) (uint64, error) {
ctx := inslogger.ContextWithTrace(context.Background(), "GetBalance")
params := []interface{}{m.Reference}
config, err := requester.CreateUserConfig(m.Reference, m.PrivateKey)
if err != nil {
return 0, errors.Wrap(err, "[ GetBalance ] can't create user config")
}
body, err := sdk.sendRequest(ctx, "GetBalance", params, config)
if err != nil {
return 0, errors.Wrap(err, "[ GetBalance ] can't send request")
}
response, err := sdk.getResponse(body)
if err != nil {
return 0, errors.Wrap(err, "[ GetBalance ] can't get response")
}
if response.Error != "" {
return 0, errors.New(response.Error)
}
// TODO FIXME don't transfer money in floats!
return uint64(response.Result.(float64)), nil
}