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package net
import (
"encoding/json"
"fmt"
"log"
"sync"
"time"
"github.com/ChainSQL/go-chainsql-api/common"
"github.com/ChainSQL/go-chainsql-api/crypto"
"github.com/ChainSQL/go-chainsql-api/event"
"github.com/ChainSQL/go-chainsql-api/export"
"github.com/ChainSQL/go-chainsql-api/util"
"github.com/buger/jsonparser"
)
//ReconnectInterval is the interval to reconnect when ws socket is disconnected
const ReconnectInterval = 10
// Client is used to send and recv websocket msg
type Client struct {
cmdIDs int64
schemaID string
wm *WebsocketManager
sendMsgChan chan string
recvMsgChan chan string
requests map[int64]*Request
mutex *sync.RWMutex
Auth *common.Auth
ServerInfo *ServerInfo
Event *event.Manager
inited bool
}
//NewClient is constructor
func NewClient() *Client {
return &Client{
cmdIDs: 0,
requests: make(map[int64]*Request),
mutex: new(sync.RWMutex),
Auth: &common.Auth{},
ServerInfo: NewServerInfo(),
Event: event.NewEventManager(),
inited: false,
}
}
//Connect is used to create a websocket connection
func (c *Client) Connect(url string) error {
if c.wm != nil {
return c.reConnect(url)
}
c.wm = NewWsClientManager(url, ReconnectInterval)
err := c.wm.Start()
if err != nil {
return err
}
c.init()
return nil
}
func (c *Client) reConnect(url string) error {
err := c.wm.Disconnect()
if err != nil {
return err
}
c.wm.SetUrl(url)
err = c.wm.Start()
if err != nil {
return err
}
if !c.inited {
c.init()
} else {
//connect changed,only subscribe
c.initSubscription()
}
return nil
}
func (c *Client) init() {
c.sendMsgChan = c.wm.WriteChan()
c.recvMsgChan = c.wm.ReadChan()
go c.processMessage()
go c.checkReconnection()
c.initSubscription()
c.inited = true
}
func (c *Client) checkReconnection() {
c.wm.OnReconnected(func() {
c.initSubscription()
})
}
func (c *Client) GetWebocketManager() *WebsocketManager {
return c.wm
}
func (c *Client) initSubscription() {
type Subscribe struct {
common.RequestBase
Streams []string `json:"streams"`
}
c.cmdIDs++
subCmd := &Subscribe{
RequestBase: common.RequestBase{
Command: "subscribe",
ID: c.cmdIDs,
},
Streams: []string{"ledger", "server"},
}
request := c.syncRequest(subCmd)
result, _, _, err := jsonparser.Get([]byte(request.Response.Value), "result")
if err != nil {
fmt.Printf("initSubscription error:%s\n", err)
return
}
c.ServerInfo.Update(string(result))
}
func (c *Client) processMessage() {
for msg := range c.recvMsgChan {
go c.handleClientMsg(msg)
}
}
func (c *Client) handleClientMsg(msg string) {
// log.Printf("handleClientMsg: %s", msg)
msgType, err := jsonparser.GetString([]byte(msg), "type")
if err != nil {
fmt.Printf("handleClientMsg error:%s\n", err)
}
// fmt.Println(msgType)
switch msgType {
case "response":
c.onResponse(msg)
case "serverStatus":
c.ServerInfo.Update(msg)
case "ledgerClosed":
c.ServerInfo.Update(msg)
c.onLedgerClosed(msg)
case "singleTransaction":
c.onSingleTransaction(msg)
case "table":
c.onTableMsg(msg)
default:
log.Printf("Unhandled message %s", msg)
}
}
func (c *Client) onResponse(msg string) {
id, err := jsonparser.GetInt([]byte(msg), "id")
if err != nil {
// fmt.Println(err)
return
}
c.mutex.Lock()
defer c.mutex.Unlock()
request, ok := c.requests[id]
if !ok {
log.Printf("onResponse:Request with id %d not exist\n", id)
return
}
defer request.Wait.Done()
delete(c.requests, id)
request.Response = &Response{
Value: msg,
Request: request,
}
}
func (c *Client) onLedgerClosed(msg string) {
c.Event.OnLedgerClosed(msg)
}
func (c *Client) onSingleTransaction(msg string) {
c.Event.OnSingleTransaction(msg)
}
func (c *Client) onTableMsg(msg string) {
c.Event.OnTableMsg(msg)
}
// GetLedger request for ledger data
func (c *Client) GetLedger(seq int) string {
type getLedger struct {
common.RequestBase
LedgerIndex int `json:"ledger_index"`
}
c.cmdIDs++
ledgerReq := &getLedger{
RequestBase: common.RequestBase{
Command: "ledger",
ID: c.cmdIDs,
},
LedgerIndex: seq,
}
request := c.syncRequest(ledgerReq)
return request.Response.Value
}
// GetLedgerVersion request for ledger version
func (c *Client) GetLedgerVersion() (int, error) {
type Request struct {
common.RequestBase
}
c.cmdIDs++
ledgerReq := &Request{
RequestBase: common.RequestBase{
Command: "ledger_current",
ID: c.cmdIDs,
},
}
request := c.syncRequest(ledgerReq)
err := c.parseResponseError(request)
if err != nil {
log.Println("GetLedgerVersion:", err)
return 0, err
}
ledgerIndex, err := jsonparser.GetInt([]byte(request.Response.Value), "result", "ledger_current_index")
if err != nil {
return 0, err
}
return int(ledgerIndex), nil
}
func (c *Client) parseResponseError(request *Request) error {
status, err := jsonparser.GetString([]byte(request.Response.Value), "status")
if err != nil {
return err
}
if status == "error" {
errMsg, _ := jsonparser.GetString([]byte(request.Response.Value), "error_message")
return fmt.Errorf("%s", errMsg)
}
return nil
}
// GetAccountInfo request for account_info
func (c *Client) GetAccountInfo(address string) (string, error) {
type getAccount struct {
common.RequestBase
Account string `json:"account"`
}
c.cmdIDs++
accountReq := &getAccount{}
accountReq.ID = c.cmdIDs
accountReq.Command = "account_info"
accountReq.Account = address
request := c.syncRequest(accountReq)
err := c.parseResponseError(request)
if err != nil {
return "", err
}
return request.Response.Value, nil
}
// GetNameInDB request for table nameInDB
func (c *Client) GetNameInDB(address string, tableName string) (string, error) {
type Request struct {
common.RequestBase
Account string `json:"account"`
TableName string `json:"tablename"`
}
c.cmdIDs++
req := &Request{}
req.ID = c.cmdIDs
req.Command = "g_dbname"
req.Account = address
req.TableName = tableName
request := c.syncRequest(req)
err := c.parseResponseError(request)
if err != nil {
return "", err
}
nameInDB, err := jsonparser.GetString([]byte(request.Response.Value), "result", "nameInDB")
if err != nil {
return "", err
}
return nameInDB, nil
}
//Submit submit a signed transaction
func (c *Client) Submit(blob string) string {
type Request struct {
common.RequestBase
TxBlob string `json:"tx_blob"`
}
c.cmdIDs++
req := &Request{}
req.ID = c.cmdIDs
req.Command = "submit"
req.TxBlob = blob
request := c.syncRequest(req)
return request.Response.Value
}
//SubscribeTx subscribe a transaction by hash
func (c *Client) SubscribeTx(hash string, callback export.Callback) {
c.Event.SubscribeTx(hash, callback)
type Request struct {
common.RequestBase
TxHash string `json:"transaction"`
}
req := Request{}
req.Command = "subscribe"
req.TxHash = hash
c.asyncRequest(req)
}
//UnSubscribeTx subscribe a transaction by hash
func (c *Client) UnSubscribeTx(hash string) {
c.Event.UnSubscribeTx(hash)
type Request struct {
common.RequestBase
TxHash string `json:"transaction"`
}
req := Request{}
req.Command = "unsubscribe"
req.TxHash = hash
c.asyncRequest(req)
}
func (c *Client) GetTableData(dataJSON interface{}, bSql bool) (string, error) {
type Request struct {
common.RequestBase
PublicKey string `json:"publicKey"`
Signature string `json:"signature"`
SigningData string `json:"signingData"`
TxJSON interface{} `json:"tx_json"`
}
c.cmdIDs++
req := &Request{}
req.ID = c.cmdIDs
req.Command = "r_get"
if bSql {
req.Command = "r_get_sql_user"
}
req.TxJSON = dataJSON
accStr, err := crypto.GenerateAccount(c.Auth.Secret)
if err != nil {
return "", err
}
publicKey, err := jsonparser.GetString([]byte(accStr), "publicKeyHex")
if err != nil {
return "", err
}
jsonStr, err := json.Marshal(dataJSON)
if err != nil {
return "", err
}
signature, err := util.SignPlainData(c.Auth.Secret, string(jsonStr))
if err != nil {
return "", err
}
req.PublicKey = publicKey
req.SigningData = string(jsonStr)
req.Signature = string(signature)
request := c.syncRequest(req)
err = c.parseResponseError(request)
if err != nil {
if err.Error() == "Invalid field 'LedgerIndex'." {
c.ServerInfo.Updated = false
}
return "", err
}
result, _, _, err := jsonparser.Get([]byte(request.Response.Value), "result")
if err != nil {
// log.Printf("Cleint::GetTableData %s\n",err)
return "", err
}
// log.Printf("type:%T\n",result)
return string(result), nil
}
func (c *Client) syncRequest(v common.IRequest) *Request {
data, _ := json.Marshal(v)
request := NewRequest(v.GetID(), string(data))
request.Wait.Add(1)
c.sendRequest(request)
done := make(chan struct{})
go func() {
request.Wait.Wait()
close(done)
}()
select {
case <-done:
case <-time.After(util.REQUEST_TIMEOUT * time.Second):
{
timeOutMsg := string(`{
"status":"error",
"error_message":"request timeout"
}`)
request.Response = &Response{
Value: timeOutMsg,
Request: request,
}
}
}
return request
}
func (c *Client) sendRequest(request *Request) {
c.mutex.Lock()
c.requests[request.ID] = request
c.mutex.Unlock()
// log.Printf("sendRequest %s\n", request.JSON)
c.sendMsgChan <- request.JSON
}
func (c *Client) asyncRequest(v interface{}) {
data, _ := json.Marshal(v)
c.sendMsgChan <- string(data)
}