/
webServer.go
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/
webServer.go
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package gin
import (
"context"
"fmt"
"net/http"
"sync"
"time"
"github.com/gin-contrib/cors"
"github.com/gin-contrib/pprof"
"github.com/gin-gonic/gin"
"github.com/multiversx/mx-chain-core-go/core/check"
"github.com/multiversx/mx-chain-core-go/marshal"
"github.com/multiversx/mx-chain-go/api/errors"
"github.com/multiversx/mx-chain-go/api/groups"
"github.com/multiversx/mx-chain-go/api/middleware"
"github.com/multiversx/mx-chain-go/api/shared"
"github.com/multiversx/mx-chain-go/config"
"github.com/multiversx/mx-chain-go/facade"
logger "github.com/multiversx/mx-chain-logger-go"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var log = logger.GetOrCreate("api/gin")
const prometheusMetricsRoute = "/debug/metrics/prometheus"
// ArgsNewWebServer holds the arguments needed to create a new instance of webServer
type ArgsNewWebServer struct {
Facade shared.FacadeHandler
ApiConfig config.ApiRoutesConfig
AntiFloodConfig config.WebServerAntifloodConfig
}
type webServer struct {
sync.RWMutex
facade shared.FacadeHandler
apiConfig config.ApiRoutesConfig
antiFloodConfig config.WebServerAntifloodConfig
httpServer shared.HttpServerCloser
groups map[string]shared.GroupHandler
cancelFunc func()
}
// NewGinWebServerHandler returns a new instance of webServer
func NewGinWebServerHandler(args ArgsNewWebServer) (*webServer, error) {
err := checkArgs(args)
if err != nil {
return nil, err
}
return &webServer{
facade: args.Facade,
antiFloodConfig: args.AntiFloodConfig,
apiConfig: args.ApiConfig,
}, nil
}
// UpdateFacade updates the main api handler by closing the old server and starting it with the new facade. Returns the
// new web server
func (ws *webServer) UpdateFacade(facade shared.FacadeHandler) error {
if check.IfNil(facade) {
return errors.ErrNilFacadeHandler
}
ws.Lock()
defer ws.Unlock()
ws.facade = facade
for groupName, groupHandler := range ws.groups {
log.Debug("upgrading facade for gin API group", "group name", groupName)
err := groupHandler.UpdateFacade(facade)
if err != nil {
log.Error("cannot update facade for gin API group", "group name", groupName, "error", err)
}
}
return nil
}
// StartHttpServer will create a new instance of http.Server and populate it with all the routes
func (ws *webServer) StartHttpServer() error {
ws.Lock()
defer ws.Unlock()
if ws.facade.RestApiInterface() == facade.DefaultRestPortOff {
log.Debug("web server is turned off")
return nil
}
var engine *gin.Engine
if !ws.facade.RestAPIServerDebugMode() {
gin.DefaultWriter = &ginWriter{}
gin.DefaultErrorWriter = &ginErrorWriter{}
gin.DisableConsoleColor()
gin.SetMode(gin.ReleaseMode)
}
engine = gin.Default()
engine.Use(cors.Default())
processors, err := ws.createMiddlewareLimiters()
if err != nil {
return err
}
for idx, proc := range processors {
if check.IfNil(proc) {
log.Error("got nil middleware processor, skipping it...", "index", idx)
continue
}
engine.Use(proc.MiddlewareHandlerFunc())
}
err = registerValidators()
if err != nil {
return err
}
err = ws.createGroups()
if err != nil {
return err
}
ws.registerRoutes(engine)
server := &http.Server{Addr: ws.facade.RestApiInterface(), Handler: engine}
log.Debug("creating gin web sever", "interface", ws.facade.RestApiInterface())
ws.httpServer, err = NewHttpServer(server)
if err != nil {
return err
}
if !ws.antiFloodConfig.WebServerAntifloodEnabled {
log.Debug("starting web server with no throttler middleware")
} else {
log.Debug("starting web server",
"SimultaneousRequests", ws.antiFloodConfig.SimultaneousRequests,
"SameSourceRequests", ws.antiFloodConfig.SameSourceRequests,
"SameSourceResetIntervalInSec", ws.antiFloodConfig.SameSourceResetIntervalInSec,
)
}
go ws.httpServer.Start()
return nil
}
func (ws *webServer) createGroups() error {
groupsMap := make(map[string]shared.GroupHandler)
addressGroup, err := groups.NewAddressGroup(ws.facade)
if err != nil {
return err
}
groupsMap["address"] = addressGroup
blockGroup, err := groups.NewBlockGroup(ws.facade)
if err != nil {
return err
}
groupsMap["block"] = blockGroup
internalBlockGroup, err := groups.NewInternalBlockGroup(ws.facade)
if err != nil {
return err
}
groupsMap["internal"] = internalBlockGroup
hardforkGroup, err := groups.NewHardforkGroup(ws.facade)
if err != nil {
return err
}
groupsMap["hardfork"] = hardforkGroup
networkGroup, err := groups.NewNetworkGroup(ws.facade)
if err != nil {
return err
}
groupsMap["network"] = networkGroup
nodeGroup, err := groups.NewNodeGroup(ws.facade)
if err != nil {
return err
}
groupsMap["node"] = nodeGroup
proofGroup, err := groups.NewProofGroup(ws.facade)
if err != nil {
return err
}
groupsMap["proof"] = proofGroup
transactionGroup, err := groups.NewTransactionGroup(ws.facade)
if err != nil {
return err
}
groupsMap["transaction"] = transactionGroup
validatorGroup, err := groups.NewValidatorGroup(ws.facade)
if err != nil {
return err
}
groupsMap["validator"] = validatorGroup
vmValuesGroup, err := groups.NewVmValuesGroup(ws.facade)
if err != nil {
return err
}
groupsMap["vm-values"] = vmValuesGroup
ws.groups = groupsMap
return nil
}
func (ws *webServer) registerRoutes(ginRouter *gin.Engine) {
for groupName, groupHandler := range ws.groups {
log.Debug("registering gin API group", "group name", groupName)
ginGroup := ginRouter.Group(fmt.Sprintf("/%s", groupName))
groupHandler.RegisterRoutes(ginGroup, ws.apiConfig)
}
if isLogRouteEnabled(ws.apiConfig) {
marshalizerForLogs := &marshal.GogoProtoMarshalizer{}
registerLoggerWsRoute(ginRouter, marshalizerForLogs)
}
if ws.facade.PprofEnabled() {
pprof.Register(ginRouter)
}
if ws.facade.P2PPrometheusMetricsEnabled() {
ginRouter.GET(prometheusMetricsRoute, gin.WrapH(promhttp.Handler()))
}
}
func (ws *webServer) createMiddlewareLimiters() ([]shared.MiddlewareProcessor, error) {
middlewares := make([]shared.MiddlewareProcessor, 0)
if ws.apiConfig.Logging.LoggingEnabled {
responseLoggerMiddleware := middleware.NewResponseLoggerMiddleware(time.Duration(ws.apiConfig.Logging.ThresholdInMicroSeconds) * time.Microsecond)
middlewares = append(middlewares, responseLoggerMiddleware)
}
if ws.antiFloodConfig.WebServerAntifloodEnabled {
sourceLimiter, err := middleware.NewSourceThrottler(ws.antiFloodConfig.SameSourceRequests)
if err != nil {
return nil, err
}
var ctx context.Context
ctx, ws.cancelFunc = context.WithCancel(context.Background())
go ws.sourceLimiterReset(ctx, sourceLimiter)
middlewares = append(middlewares, sourceLimiter)
globalLimiter, err := middleware.NewGlobalThrottler(ws.antiFloodConfig.SimultaneousRequests)
if err != nil {
return nil, err
}
middlewares = append(middlewares, globalLimiter)
}
return middlewares, nil
}
func (ws *webServer) sourceLimiterReset(ctx context.Context, reset resetHandler) {
betweenResetDuration := time.Second * time.Duration(ws.antiFloodConfig.SameSourceResetIntervalInSec)
for {
select {
case <-time.After(betweenResetDuration):
log.Trace("calling reset on WS source limiter")
reset.Reset()
case <-ctx.Done():
log.Debug("closing nodeFacade.sourceLimiterReset go routine")
return
}
}
}
// Close will handle the closing of inner components
func (ws *webServer) Close() error {
if ws.cancelFunc != nil {
ws.cancelFunc()
}
var err error
ws.Lock()
if !check.IfNil(ws.httpServer) {
err = ws.httpServer.Close()
}
ws.Unlock()
if err != nil {
err = fmt.Errorf("%w while closing the http server in gin/webServer", err)
}
return err
}
// IsInterfaceNil returns true if there is no value under the interface
func (ws *webServer) IsInterfaceNil() bool {
return ws == nil
}