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websocket.go
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websocket.go
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/**
* Copyright © 2024, Staufi Tech - Switzerland
* All rights reserved.
*
* ________________________ ___ _ ________________ _ ____
* / _____ _ ____________/ / __|_| /_______________ | | ___/
* ( (____ _| |_ _____ _ _ _| |__ _ | |_____ ____| |_|_
* \____ (_ _|____ | | | (_ __) | | | ___ |/ ___) _ \
* _____) )| |_/ ___ | |_| | | | | | | | ____( (___| | | |
* (______/ \__)_____|____/ |_| |_| |_|_____)\____)_| |_|
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package server
import (
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"github.com/ChrIgiSta/go-can-coder/cancoder"
"github.com/ChrIgiSta/go-easy-websockets/websocket"
log "github.com/ChrIgiSta/go-utils/logger"
)
type WsMsg struct {
Device string `json:"device"`
Msg cancoder.CanValueDef `json:"message"`
}
type CanFrame struct {
ArbitrationID uint32 `json:"arbitrationID"`
DLC uint8 `json:"DLC"`
Data []byte `json:"data"` // base64
}
func NewCanFrame(arbitrationID uint32, DLC uint8, data []byte) *CanFrame {
return &CanFrame{
ArbitrationID: arbitrationID,
DLC: DLC,
Data: []byte(base64.RawStdEncoding.EncodeToString(data)),
}
}
func (f *CanFrame) GetData() (raw []byte, err error) {
raw, err = base64.RawStdEncoding.DecodeString(string(f.Data))
return
}
type ReceiveCallback func(msg any)
type WsServer struct {
server *websocket.Server
rxClbk ReceiveCallback
}
func NewWsServer(port uint16, path string, receiveCallback ReceiveCallback, apiKey string, certificate []byte, privateKey []byte) *WsServer {
ws := WsServer{
rxClbk: receiveCallback,
}
portS := fmt.Sprintf(":%d/%s", port, path)
ws.server = websocket.NewServer(":"+portS, &ws)
ws.server.SetupTls(certificate, privateKey)
ws.server.SetAuthHeader(websocket.NewAuthHeader("X-Api-Key", apiKey, websocket.HashAlgoSHA256))
return &ws
}
func (s *WsServer) Serve() error {
return s.server.ListenAndServe()
}
func (s *WsServer) SendEncoded(msg WsMsg) error {
return s.Send(msg)
}
func (s *WsServer) SendCanFrame(frame CanFrame) error {
return s.Send(frame)
}
func (s *WsServer) Send(msg any) error {
payload, err := json.Marshal(msg)
if err != nil {
return err
}
go s.server.Broadcast(&websocket.Message{
MessageType: 1,
Data: payload,
})
return nil
}
func (t *WsServer) OnReceive(msg websocket.Message) {
_ = log.Fine("Websocket", "onReceive: %v", msg)
var wsMsg any
if strings.ContainsAny(string(msg.Data), "message") {
wsMsg = WsMsg{}
} else if strings.ContainsAny(string(msg.Data), "arbitrationID") {
wsMsg = CanFrame{}
}
err := json.Unmarshal(msg.Data, &wsMsg)
if err != nil {
log.Warn("websocket", "rx msg error: %v", err)
} else if t.rxClbk != nil {
t.rxClbk(wsMsg)
}
}
func (t *WsServer) OnDisconnect(id int) {
_ = log.Fine("Websocket", "onDisconnect: %v", id)
}
func (t *WsServer) OnConnect(id int) {
_ = log.Fine("Websocket", "onConnect: %v", id)
}
func (t *WsServer) OnFailure(exited bool, err error) {
_ = log.Fine("Websocket", "onFailure: %v", err)
}