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main.go
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main.go
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package main
import (
"fmt"
"log"
"net/http"
"github.com/gin-gonic/gin"
"github.com/grbr/binance-price/util"
"github.com/shopspring/decimal"
)
func priceBitcoinBinance(c *gin.Context) {
price, err := GetCachedBitcoinPrice()
if err != nil {
fmt.Println(err)
c.JSON(http.StatusServiceUnavailable, "Service unavailable")
} else {
c.JSON(http.StatusOK, price.toDTO())
}
}
func setupRouter(r *gin.Engine) {
r.GET("/", priceBitcoinBinance)
}
func checkConfigAndSetDefaults(config *util.Config) {
if config.PORT == 0 {
config.PORT = 3000
}
if config.PORT < 2 || config.PORT > 65536 {
log.Fatal("[config] PORT must be between 2 and 65536")
}
if config.UPDATE_INTERVAL_MILLIS == 0 {
config.UPDATE_INTERVAL_MILLIS = 10000
}
if config.UPDATE_INTERVAL_MILLIS < 0 {
log.Fatal("[config] UPDATE_INTERVAL_MILLIS must be a positive number")
}
if config.SERVICE_COMMISSION_PERCENT <= 0 {
log.Fatal("[config] SERVICE_COMMISSION_PERCENT must be a positive number")
}
}
func main() {
config, err := util.LoadConfig(".")
if err != nil {
log.Fatal("cannot load config: ", err)
}
checkConfigAndSetDefaults(&config)
SetCommissionPercent(decimal.NewFromFloat(config.SERVICE_COMMISSION_PERCENT))
FetchBitcoinPriceEvery(int64(config.UPDATE_INTERVAL_MILLIS))
r := gin.Default()
setupRouter(r)
err = r.Run(fmt.Sprintf(":%d", config.PORT))
if err != nil {
log.Fatalf("gin Run error: %s", err)
}
}