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server.go
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server.go
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package kit
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/labstack/echo/v4"
echoMiddleware "github.com/labstack/echo/v4/middleware"
)
var (
_SERVER_DEFAULT_REQUEST_HEADER_MAX_SIZE = 1 << 10 // 1 KB
_SERVER_DEFAULT_REQUEST_BODY_MAX_SIZE = 4 << 10 // 4 KB
_SERVER_DEFAULT_REQUEST_FILE_MAX_SIZE = 2 << 20 // 2 MB
_SERVER_DEFAULT_REQUEST_KEEP_ALIVE_TIMEOUT = 30 * time.Second
_SERVER_DEFAULT_REQUEST_READ_TIMEOUT = 30 * time.Second
_SERVER_DEFAULT_REQUEST_READ_HEADER_TIMEOUT = 30 * time.Second
_SERVER_DEFAULT_REQUEST_IP_EXTRACTOR func(*http.Request) string = echo.ExtractIPFromRealIPHeader()
_SERVER_DEFAULT_RESPONSE_WRITE_TIMEOUT = 30 * time.Second
)
type ServerConfig struct {
Environment Environment
AppPort int
RequestHeaderMaxSize *int
RequestBodyMaxSize *int
RequestFileMaxSize *int
RequestKeepAliveTimeout *time.Duration
RequestReadTimeout *time.Duration
RequestReadHeaderTimeout *time.Duration
RequestIPExtractor *func(*http.Request) string
ResponseWriteTimeout *time.Duration
}
type Server struct {
config ServerConfig
observer Observer
server *echo.Echo
}
func NewServer(observer Observer, serializer Serializer, binder Binder,
renderer Renderer, exceptionHandler ExceptionHandler, config ServerConfig) *Server {
if config.RequestHeaderMaxSize == nil {
config.RequestHeaderMaxSize = ptr(_SERVER_DEFAULT_REQUEST_HEADER_MAX_SIZE)
}
if config.RequestBodyMaxSize == nil {
config.RequestBodyMaxSize = ptr(_SERVER_DEFAULT_REQUEST_BODY_MAX_SIZE)
}
if config.RequestFileMaxSize == nil {
config.RequestFileMaxSize = ptr(_SERVER_DEFAULT_REQUEST_FILE_MAX_SIZE)
}
if config.RequestKeepAliveTimeout == nil {
config.RequestKeepAliveTimeout = ptr(_SERVER_DEFAULT_REQUEST_KEEP_ALIVE_TIMEOUT)
}
if config.RequestReadTimeout == nil {
config.RequestReadTimeout = ptr(_SERVER_DEFAULT_REQUEST_READ_TIMEOUT)
}
if config.RequestReadHeaderTimeout == nil {
config.RequestReadHeaderTimeout = ptr(_SERVER_DEFAULT_REQUEST_READ_HEADER_TIMEOUT)
}
if config.RequestIPExtractor == nil {
config.RequestIPExtractor = ptr(_SERVER_DEFAULT_REQUEST_IP_EXTRACTOR)
}
if config.ResponseWriteTimeout == nil {
config.ResponseWriteTimeout = ptr(_SERVER_DEFAULT_RESPONSE_WRITE_TIMEOUT)
}
server := echo.New()
server.HideBanner = true
server.HidePort = true
server.DisableHTTP2 = true
server.Debug = config.Environment == EnvDevelopment
server.Server.MaxHeaderBytes = *config.RequestHeaderMaxSize
server.Server.IdleTimeout = *config.RequestKeepAliveTimeout
server.Server.ReadHeaderTimeout = *config.RequestReadHeaderTimeout
server.Server.ReadTimeout = *config.RequestReadTimeout
server.Server.WriteTimeout = *config.ResponseWriteTimeout
// server.Logger = nil // Observer should always be used instead
// server.StdLogger = nil // Observer should always be used instead
server.JSONSerializer = &serializer
server.Binder = &binder
server.Renderer = &renderer
// server.Validator = nil // Validator should always be at domain level
server.HTTPErrorHandler = exceptionHandler.Handle
server.IPExtractor = *config.RequestIPExtractor
// TODO: move this to a middleware in order to be able to log giant requests?
server.Pre(echoMiddleware.BodyLimitWithConfig(echoMiddleware.BodyLimitConfig{
Skipper: func(ctx echo.Context) bool {
// TODO: allow to customize this or provide a built-in system for files?
return strings.HasPrefix(ctx.Request().RequestURI, "/file")
},
Limit: Utils.ByteSize(*config.RequestBodyMaxSize),
}))
server.Pre(echoMiddleware.BodyLimitWithConfig(echoMiddleware.BodyLimitConfig{
Limit: Utils.ByteSize(*config.RequestFileMaxSize),
}))
// Pre hook middleware
server.Pre(func(next echo.HandlerFunc) echo.HandlerFunc {
return func(ctx echo.Context) error {
ctx.Request().RemoteAddr = ctx.RealIP()
return next(ctx)
}
})
return &Server{
config: config,
observer: observer,
server: server,
}
}
func (self *Server) Run(ctx context.Context) error {
self.observer.Infof(ctx, "Server started at port %d", self.config.AppPort)
err := self.server.Start(fmt.Sprintf(":%d", self.config.AppPort))
if err != nil && err != http.ErrServerClosed {
return ErrServerGeneric().Wrap(err)
}
return nil
}
func (self *Server) Use(middleware ...echo.MiddlewareFunc) {
self.server.Pre(middleware...)
}
func (self *Server) Host(host string, middleware ...echo.MiddlewareFunc) *echo.Group {
return self.server.Host(host, middleware...)
}
func (self *Server) Default(middleware ...echo.MiddlewareFunc) *echo.Group {
return self.server.Group("", middleware...)
}
func (self *Server) Close(ctx context.Context) error {
err := Utils.Deadline(ctx, func(exceeded <-chan struct{}) error {
self.observer.Info(ctx, "Closing server")
self.server.Server.SetKeepAlivesEnabled(false)
err := self.server.Shutdown(ctx)
if err != nil {
return ErrServerGeneric().WrapAs(err)
}
self.observer.Info(ctx, "Closed server")
return nil
})
switch {
case err == nil:
return nil
case ErrDeadlineExceeded().Is(err):
return ErrServerTimedOut()
default:
return ErrServerGeneric().Wrap(err)
}
}