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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"os/signal"
"syscall"
"time"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/desmos-labs/caerus/analytics"
"github.com/desmos-labs/caerus/runner"
"github.com/desmos-labs/caerus/utils"
"github.com/desmos-labs/desmos/v6/app"
"github.com/gin-contrib/cors"
"github.com/gin-gonic/gin"
"github.com/rs/zerolog/log"
"github.com/desmos-labs/dpm-apis/caerus"
"github.com/desmos-labs/dpm-apis/logging"
"github.com/desmos-labs/dpm-apis/routes"
linksroutes "github.com/desmos-labs/dpm-apis/routes/links"
)
func main() {
// Setup Cosmos-related stuff
app.SetupConfig(sdk.GetConfig())
// Build the clients
caerusClient := caerus.NewClientFromEnvVariables()
// Setup the CORS
corsConfig := cors.DefaultConfig()
corsConfig.AllowAllOrigins = true
corsConfig.AllowHeaders = append(corsConfig.AllowHeaders, "Authorization")
// Build the Gin server
router := gin.New()
router.Use(logging.ZeroLog(), gin.Recovery(), cors.New(corsConfig))
// Build the routes context
ctx := routes.Context{
Router: router,
Caerus: caerusClient,
}
// Register the routes
linksroutes.RegisterWithContext(ctx)
// Build the HTTP server to be able to shut it down if needed
runningAddress := utils.GetEnvOr(runner.EnvServerAddress, "0.0.0.0")
runningPort := utils.GetEnvOr(runner.EnvServerPort, "3000")
httpServer := &http.Server{
Addr: fmt.Sprintf("%s:%s", runningAddress, runningPort),
Handler: router,
ReadHeaderTimeout: time.Minute,
ReadTimeout: time.Minute,
WriteTimeout: time.Minute,
}
// Listen for and trap any OS signal to gracefully shutdown and exit
go trapSignal(httpServer)
// Start the HTTP server
// Block main process (signal capture will call WaitGroup's Done)
log.Info().Str("address", httpServer.Addr).Msg("Starting API server")
err := httpServer.ListenAndServe()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
panic(err)
}
}
// trapSignal traps the stops signals to gracefully shut down the server
func trapSignal(httpServer *http.Server) {
// Wait for interrupt signal to gracefully shut down the server with
// a timeout of 5 seconds.
quit := make(chan os.Signal, 1)
// Kill (no param) default send syscall.SIGTERM
// Kill -2 is syscall.SIGINT
// Kill -9 is syscall.SIGKILL but can't be caught, so don't need to add it
signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
<-quit
log.Debug().Msg("Shutting down API server")
// The context is used to inform the server it has 5 seconds to finish
// the request it is currently handling
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := httpServer.Shutdown(ctx); err != nil {
log.Error().Err(err).Msg("API server forces to shutdown")
}
log.Info().Msg("API server shutdown")
// Perform the cleanup of other things
analytics.Stop()
}