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rum.go
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rum.go
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// Copyright (c) 2020 Meng Huang (mhboy@outlook.com)
// This package is licensed under a MIT license that can be found in the LICENSE file.
// Package rum implements an HTTP server.
package rum
import (
"bufio"
"crypto/tls"
"github.com/hslam/netpoll"
"github.com/hslam/request"
"github.com/hslam/response"
"net"
"net/http"
"sync"
)
// DefaultServer is the default HTTP server.
var DefaultServer = New()
// Rum is an HTTP server.
type Rum struct {
*Mux
Handler http.Handler
// TLSConfig optionally provides a TLS configuration for use
// by ServeTLS and ListenAndServeTLS. Note that this value is
// cloned by ServeTLS and ListenAndServeTLS, so it's not
// possible to modify the configuration with methods like
// tls.Config.SetSessionTicketKeys. To use
// SetSessionTicketKeys, use Server.Serve with a TLS Listener
// instead.
TLSConfig *tls.Config
fast bool
poll bool
mut sync.Mutex
listeners []net.Listener
pollers []*netpoll.Server
}
// New returns a new Rum instance.
func New() *Rum {
return &Rum{Mux: NewMux()}
}
// SetFast enables the Server to use simple request parser.
func (m *Rum) SetFast(fast bool) {
m.fast = fast
}
// SetPoll enables the Server to use netpoll based on epoll/kqueue.
func (m *Rum) SetPoll(poll bool) {
m.poll = poll
}
// Run listens on the TCP network address addr and then calls
// Serve with m to handle requests on incoming connections.
// Accepted connections are configured to enable TCP keep-alives.
//
// Run always returns a non-nil error.
func (m *Rum) Run(addr string) error {
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return m.Serve(ln)
}
// RunTLS is like Run but with a cert file and a key file.
func (m *Rum) RunTLS(addr string, certFile, keyFile string) error {
ln, err := net.Listen("tcp", addr)
if err != nil {
return err
}
return m.ServeTLS(ln, certFile, keyFile)
}
// Serve accepts incoming connections on the Listener l, creating a
// new service goroutine for each, or registering the conn fd to poll
// that will trigger the fd to read requests and then call handler
// to reply to them.
func (m *Rum) Serve(l net.Listener) error {
return m.serve(l, m.TLSConfig)
}
// ServeTLS accepts incoming connections on the Listener l, creating a
// new service goroutine for each. The service goroutines perform TLS
// setup and then read requests, calling srv.Handler to reply to them.
//
// Files containing a certificate and matching private key for the
// server must be provided if neither the Server's
// TLSConfig.Certificates nor TLSConfig.GetCertificate are populated.
// If the certificate is signed by a certificate authority, the
// certFile should be the concatenation of the server's certificate,
// any intermediates, and the CA's certificate.
//
// ServeTLS always returns a non-nil error. After Shutdown or Close, the
// returned error is ErrServerClosed.
func (m *Rum) ServeTLS(l net.Listener, certFile, keyFile string) error {
config := m.TLSConfig
if config == nil {
config = &tls.Config{}
}
if !strSliceContains(config.NextProtos, "http/1.1") {
config.NextProtos = append(config.NextProtos, "http/1.1")
}
configHasCert := len(config.Certificates) > 0 || config.GetCertificate != nil
if !configHasCert || certFile != "" || keyFile != "" {
var err error
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return err
}
}
return m.serve(l, config)
}
func (m *Rum) serve(l net.Listener, config *tls.Config) error {
if m.poll {
var handler = m.Handler
if handler == nil {
handler = m
}
var h = &netpoll.ConnHandler{}
type Context struct {
reader *bufio.Reader
rw *bufio.ReadWriter
conn net.Conn
serving sync.Mutex
}
h.SetUpgrade(func(conn net.Conn) (netpoll.Context, error) {
if config != nil {
tlsConn := tls.Server(conn, config)
if err := tlsConn.Handshake(); err != nil {
conn.Close()
return nil, err
}
conn = tlsConn
}
reader := bufio.NewReader(conn)
rw := bufio.NewReadWriter(reader, bufio.NewWriter(conn))
return &Context{reader: reader, conn: conn, rw: rw}, nil
})
if m.fast {
h.SetServe(func(context netpoll.Context) error {
ctx := context.(*Context)
var err error
var req *http.Request
ctx.serving.Lock()
req, err = request.ReadFastRequest(ctx.reader)
if err != nil {
ctx.serving.Unlock()
return err
}
res := response.NewResponse(req, ctx.conn, ctx.rw)
handler.ServeHTTP(res, req)
res.FinishRequest()
ctx.serving.Unlock()
request.FreeRequest(req)
response.FreeResponse(res)
return nil
})
} else {
h.SetServe(func(context netpoll.Context) error {
ctx := context.(*Context)
var err error
var req *http.Request
ctx.serving.Lock()
req, err = http.ReadRequest(ctx.reader)
if err != nil {
ctx.serving.Unlock()
return err
}
res := response.NewResponse(req, ctx.conn, ctx.rw)
handler.ServeHTTP(res, req)
res.FinishRequest()
ctx.serving.Unlock()
response.FreeResponse(res)
return nil
})
}
poller := &netpoll.Server{
Handler: h,
}
m.mut.Lock()
m.pollers = append(m.pollers, poller)
m.mut.Unlock()
return poller.Serve(l)
}
if config != nil {
l = tls.NewListener(l, config)
}
m.mut.Lock()
m.listeners = append(m.listeners, l)
m.mut.Unlock()
if m.fast {
for {
conn, err := l.Accept()
if err != nil {
return err
}
go m.serveFastConn(conn)
}
} else {
for {
conn, err := l.Accept()
if err != nil {
return err
}
go m.serveConn(conn)
}
}
}
// Close closes the HTTP server.
func (m *Rum) Close() error {
m.mut.Lock()
defer m.mut.Unlock()
for _, lis := range m.listeners {
lis.Close()
}
m.listeners = []net.Listener{}
for _, poller := range m.pollers {
poller.Close()
}
m.pollers = []*netpoll.Server{}
m.Handler = nil
return nil
}
func (m *Rum) serveConn(conn net.Conn) {
defer conn.Close()
reader := bufio.NewReader(conn)
rw := bufio.NewReadWriter(reader, bufio.NewWriter(conn))
var err error
var req *http.Request
var handler = m.Handler
if handler == nil {
handler = m
}
for {
req, err = http.ReadRequest(reader)
if err != nil {
break
}
res := response.NewResponse(req, conn, rw)
handler.ServeHTTP(res, req)
res.FinishRequest()
response.FreeResponse(res)
}
}
func (m *Rum) serveFastConn(conn net.Conn) {
defer conn.Close()
reader := bufio.NewReader(conn)
rw := bufio.NewReadWriter(reader, bufio.NewWriter(conn))
var err error
var req *http.Request
var handler = m.Handler
if handler == nil {
handler = m
}
for {
req, err = request.ReadFastRequest(reader)
if err != nil {
break
}
res := response.NewResponse(req, conn, rw)
handler.ServeHTTP(res, req)
res.FinishRequest()
request.FreeRequest(req)
response.FreeResponse(res)
}
}
// ListenAndServe listens on the TCP network address addr and then calls
// Serve with handler to handle requests on incoming connections.
// Accepted connections are configured to enable TCP keep-alives.
//
// The handler is typically nil, in which case the DefaultServeMux is used.
//
// ListenAndServe always returns a non-nil error.
func ListenAndServe(addr string, handler http.Handler) error {
rum := DefaultServer
rum.Handler = handler
return rum.Run(addr)
}
// ListenAndServeTLS acts identically to ListenAndServe, except that it
// expects HTTPS connections. Additionally, files containing a certificate and
// matching private key for the server must be provided. If the certificate
// is signed by a certificate authority, the certFile should be the concatenation
// of the server's certificate, any intermediates, and the CA's certificate.
func ListenAndServeTLS(addr, certFile, keyFile string, handler http.Handler) error {
rum := DefaultServer
rum.Handler = handler
return rum.RunTLS(addr, certFile, keyFile)
}
func strSliceContains(ss []string, s string) bool {
for _, v := range ss {
if v == s {
return true
}
}
return false
}