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server.go
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server.go
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package server
import (
"context"
"errors"
"io/fs"
"net/http"
"os"
"os/signal"
"syscall"
"github.com/dagu-dev/dagu/internal/config"
"github.com/dagu-dev/dagu/internal/logger"
"github.com/dagu-dev/dagu/internal/logger/tag"
"github.com/dagu-dev/dagu/service/frontend/restapi"
"github.com/go-openapi/loads"
flags "github.com/jessevdk/go-flags"
pkgmiddleware "github.com/dagu-dev/dagu/service/frontend/middleware"
"github.com/dagu-dev/dagu/service/frontend/restapi/operations"
"github.com/go-chi/chi/v5"
)
type BasicAuth struct {
Username string
Password string
}
type AuthToken struct {
Token string
}
type Params struct {
Host string
Port int
BasicAuth *BasicAuth
AuthToken *AuthToken
TLS *config.TLS
Logger logger.Logger
Handlers []New
AssetsFS fs.FS
}
type Server struct {
host string
port int
basicAuth *BasicAuth
authToken *AuthToken
tls *config.TLS
logger logger.Logger
server *restapi.Server
handlers []New
assets fs.FS
}
type New interface {
Configure(api *operations.DaguAPI)
}
func NewServer(params Params) *Server {
return &Server{
host: params.Host,
port: params.Port,
basicAuth: params.BasicAuth,
authToken: params.AuthToken,
tls: params.TLS,
logger: params.Logger,
handlers: params.Handlers,
assets: params.AssetsFS,
}
}
func (svr *Server) Shutdown() {
if svr.server == nil {
return
}
err := svr.server.Shutdown()
if err != nil {
svr.logger.Warn("Server shutdown", tag.Error(err))
}
}
func (svr *Server) Serve(ctx context.Context) (err error) {
middlewareOptions := &pkgmiddleware.Options{
Handler: svr.defaultRoutes(chi.NewRouter()),
}
if svr.authToken != nil {
middlewareOptions.AuthToken = &pkgmiddleware.AuthToken{
Token: svr.authToken.Token,
}
}
if svr.basicAuth != nil {
middlewareOptions.AuthBasic = &pkgmiddleware.AuthBasic{
Username: svr.basicAuth.Username,
Password: svr.basicAuth.Password,
}
}
pkgmiddleware.Setup(middlewareOptions)
swaggerSpec, err := loads.Analyzed(restapi.SwaggerJSON, "")
if err != nil {
svr.logger.Error("failed to load API spec", tag.Error(err))
return err
}
api := operations.NewDaguAPI(swaggerSpec)
for _, h := range svr.handlers {
h.Configure(api)
}
svr.server = restapi.NewServer(api)
defer svr.Shutdown()
svr.server.Host = svr.host
svr.server.Port = svr.port
svr.server.ConfigureAPI()
// Server run context
serverCtx, serverStopCtx := context.WithCancel(ctx)
// Listen for syscall signals for process to interrupt/quit
sig := make(chan os.Signal, 1)
signal.Notify(sig, syscall.SIGHUP, syscall.SIGINT, syscall.SIGTERM, syscall.SIGQUIT)
go func() {
<-sig
// Trigger graceful shutdown
err := svr.server.Shutdown()
if err != nil {
svr.logger.Error("server shutdown error", tag.Error(err))
}
serverStopCtx()
}()
if svr.tls != nil {
svr.server.TLSCertificate = flags.Filename(svr.tls.CertFile)
svr.server.TLSCertificateKey = flags.Filename(svr.tls.KeyFile)
svr.server.EnabledListeners = []string{"https"}
svr.server.TLSHost = svr.host
svr.server.TLSPort = svr.port
}
// Run the server
err = svr.server.Serve()
if err != nil && !errors.Is(err, http.ErrServerClosed) {
svr.logger.Error("server error", tag.Error(err))
}
// Wait for server context to be stopped
<-serverCtx.Done()
svr.logger.Info("server closed")
return nil
}