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package http
import (
"net/http"
"github.com/spiral/roadrunner/service"
"context"
"github.com/spiral/roadrunner"
"github.com/spiral/roadrunner/service/rpc"
)
// Name contains default svc name.
const Name = "http"
type middleware interface {
// Handle must return true if request/response pair is handled withing the middleware.
Handle(w http.ResponseWriter, r *http.Request) bool
}
// Service manages rr, http servers.
type Service struct {
cfg *Config
listeners []func(event int, ctx interface{})
middleware []middleware
rr *roadrunner.Server
srv *Handler
http *http.Server
}
func (s *Service) AddMiddleware(m middleware) {
s.middleware = append(s.middleware, m)
}
// AddListener attaches server event watcher.
func (s *Service) AddListener(l func(event int, ctx interface{})) {
s.listeners = append(s.listeners, l)
}
// Configure must return configure svc and return true if svc hasStatus enabled. Must return error in case of
// misconfiguration. Services must not be used without proper configuration pushed first.
func (s *Service) Configure(cfg service.Config, c service.Container) (bool, error) {
config := &Config{}
if err := cfg.Unmarshal(config); err != nil {
return false, err
}
if !config.Enable {
return false, nil
}
if err := config.Valid(); err != nil {
return false, err
}
s.cfg = config
// registering http RPC interface
if r, ok := c.Get(rpc.Name); ok >= service.StatusConfigured {
if h, ok := r.(*rpc.Service); ok {
h.Register(Name, &rpcServer{s})
}
}
return true, nil
}
// Serve serves the svc.
func (s *Service) Serve() error {
rr := roadrunner.NewServer(s.cfg.Workers)
s.rr = rr
s.srv = &Handler{cfg: s.cfg, rr: s.rr}
s.http = &http.Server{Addr: s.cfg.Address}
s.rr.Listen(s.listener)
s.srv.Listen(s.listener)
if len(s.middleware) == 0 {
s.http.Handler = s.srv
} else {
s.http.Handler = s
}
if err := rr.Start(); err != nil {
return err
}
defer s.rr.Stop()
if err := s.http.ListenAndServe(); err != nil {
return err
}
return nil
}
// Stop stops the svc.
func (s *Service) Stop() {
if s.http == nil {
return
}
s.http.Shutdown(context.Background())
}
// Handle handles connection using set of middleware and rr PSR-7 server.
func (s *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
for _, m := range s.middleware {
if m.Handle(w, r) {
return
}
}
s.srv.ServeHTTP(w, r)
}
func (s *Service) listener(event int, ctx interface{}) {
for _, l := range s.listeners {
l(event, ctx)
}
if event == roadrunner.EventServerFailure {
// attempting rr server restart
if err := s.rr.Start(); err != nil {
s.Stop()
}
}
}
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