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websocket.go
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websocket.go
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package main
import (
"encoding/json"
"log"
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
)
func wshandler(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Println("Failed to upgrade to WebSocket:", err)
return
}
defer conn.Close()
for {
_, msg, err := conn.ReadMessage()
if err != nil {
log.Println("Read error:", err)
break
}
var wsMsg WSMessage
if err := json.Unmarshal(msg, &wsMsg); err != nil {
log.Println("Error decoding message:", err)
continue
}
switch wsMsg.Action {
case "getStock":
stockTicker := wsMsg.Ticker
latestPrice, highestPrice, lowestPrice, err := processStockData(stockTicker)
if err != nil {
log.Println("Error processing stock data:", err)
continue
}
response, err := json.Marshal(map[string]interface{}{
"action": "stockData",
"ticker": stockTicker,
"latestPrice": latestPrice,
"highestPrice": highestPrice,
"lowestPrice": lowestPrice,
})
if err != nil {
log.Println("Error encoding response:", err)
continue
}
if err := conn.WriteMessage(websocket.TextMessage, response); err != nil {
log.Println("Write error:", err)
break
}
case "getStocks":
stocks := wsMsg.Tickers
go func() {
ticker := time.NewTicker(1 * time.Minute)
defer ticker.Stop()
for range ticker.C {
var wg sync.WaitGroup
results := make(chan StockData, len(stocks))
for _, ticker := range stocks {
wg.Add(1)
go fetchStockData(results, ticker, &wg)
}
wg.Wait()
close(results)
allStocksData := make([]StockData, 0, len(stocks))
for stockData := range results {
allStocksData = append(allStocksData, stockData)
}
response, err := json.Marshal(map[string]interface{}{
"action": "stocksData",
"data": allStocksData,
})
if err != nil {
log.Println("Error encoding response:", err)
continue
}
// send response
if err := conn.WriteMessage(websocket.TextMessage, response); err != nil {
log.Println("Write error:", err)
break
}
}
}()
}
}
}