2019-06-03 20:30:43 +02:00
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package web
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import (
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"crypto/tls"
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2019-07-08 09:01:42 +02:00
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"fmt"
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2019-06-03 20:30:43 +02:00
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"net"
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"net/http"
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"os"
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"os/signal"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/micro/cli"
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"github.com/micro/go-micro"
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"github.com/micro/go-micro/registry"
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maddr "github.com/micro/go-micro/util/addr"
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mhttp "github.com/micro/go-micro/util/http"
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"github.com/micro/go-micro/util/log"
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mnet "github.com/micro/go-micro/util/net"
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mls "github.com/micro/go-micro/util/tls"
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)
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type service struct {
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opts Options
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mux *http.ServeMux
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srv *registry.Service
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sync.Mutex
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running bool
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static bool
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exit chan chan error
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}
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func newService(opts ...Option) Service {
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options := newOptions(opts...)
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s := &service{
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opts: options,
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mux: http.NewServeMux(),
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static: true,
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}
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s.srv = s.genSrv()
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return s
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}
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func (s *service) genSrv() *registry.Service {
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// default host:port
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parts := strings.Split(s.opts.Address, ":")
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host := strings.Join(parts[:len(parts)-1], ":")
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port, _ := strconv.Atoi(parts[len(parts)-1])
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// check the advertise address first
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// if it exists then use it, otherwise
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// use the address
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if len(s.opts.Advertise) > 0 {
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parts = strings.Split(s.opts.Advertise, ":")
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// we have host:port
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if len(parts) > 1 {
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// set the host
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host = strings.Join(parts[:len(parts)-1], ":")
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// get the port
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if aport, _ := strconv.Atoi(parts[len(parts)-1]); aport > 0 {
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port = aport
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}
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} else {
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host = parts[0]
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}
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}
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addr, err := maddr.Extract(host)
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if err != nil {
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// best effort localhost
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addr = "127.0.0.1"
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}
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return ®istry.Service{
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Name: s.opts.Name,
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Version: s.opts.Version,
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Nodes: []*registry.Node{®istry.Node{
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Id: s.opts.Id,
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2019-07-08 09:01:42 +02:00
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Address: fmt.Sprintf("%s:%d", addr, port),
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2019-06-03 20:30:43 +02:00
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Metadata: s.opts.Metadata,
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}},
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}
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}
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func (s *service) run(exit chan bool) {
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if s.opts.RegisterInterval <= time.Duration(0) {
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return
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}
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t := time.NewTicker(s.opts.RegisterInterval)
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for {
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select {
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case <-t.C:
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s.register()
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case <-exit:
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t.Stop()
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return
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}
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}
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}
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func (s *service) register() error {
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if s.srv == nil {
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return nil
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}
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// default to service registry
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r := s.opts.Service.Client().Options().Registry
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// switch to option if specified
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if s.opts.Registry != nil {
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r = s.opts.Registry
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}
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return r.Register(s.srv, registry.RegisterTTL(s.opts.RegisterTTL))
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}
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func (s *service) deregister() error {
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if s.srv == nil {
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return nil
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}
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// default to service registry
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r := s.opts.Service.Client().Options().Registry
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// switch to option if specified
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if s.opts.Registry != nil {
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r = s.opts.Registry
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}
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return r.Deregister(s.srv)
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}
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func (s *service) start() error {
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s.Lock()
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defer s.Unlock()
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if s.running {
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return nil
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}
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l, err := s.listen("tcp", s.opts.Address)
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if err != nil {
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return err
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}
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s.opts.Address = l.Addr().String()
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srv := s.genSrv()
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srv.Endpoints = s.srv.Endpoints
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s.srv = srv
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var h http.Handler
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if s.opts.Handler != nil {
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h = s.opts.Handler
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} else {
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h = s.mux
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var r sync.Once
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// register the html dir
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r.Do(func() {
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// static dir
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static := s.opts.StaticDir
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if s.opts.StaticDir[0] != '/' {
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dir, _ := os.Getwd()
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static = filepath.Join(dir, static)
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}
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// set static if no / handler is registered
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if s.static {
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_, err := os.Stat(static)
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if err == nil {
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log.Logf("Enabling static file serving from %s", static)
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s.mux.Handle("/", http.FileServer(http.Dir(static)))
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}
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}
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})
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}
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for _, fn := range s.opts.BeforeStart {
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if err := fn(); err != nil {
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return err
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}
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}
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var httpSrv *http.Server
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if s.opts.Server != nil {
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httpSrv = s.opts.Server
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} else {
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httpSrv = &http.Server{}
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}
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httpSrv.Handler = h
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go httpSrv.Serve(l)
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for _, fn := range s.opts.AfterStart {
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if err := fn(); err != nil {
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return err
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}
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}
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s.exit = make(chan chan error, 1)
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s.running = true
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go func() {
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ch := <-s.exit
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ch <- l.Close()
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}()
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log.Logf("Listening on %v\n", l.Addr().String())
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return nil
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}
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func (s *service) stop() error {
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s.Lock()
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defer s.Unlock()
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if !s.running {
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return nil
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}
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for _, fn := range s.opts.BeforeStop {
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if err := fn(); err != nil {
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return err
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}
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}
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ch := make(chan error, 1)
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s.exit <- ch
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s.running = false
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log.Log("Stopping")
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for _, fn := range s.opts.AfterStop {
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if err := fn(); err != nil {
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if chErr := <-ch; chErr != nil {
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return chErr
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}
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return err
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}
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}
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return <-ch
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}
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func (s *service) Client() *http.Client {
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rt := mhttp.NewRoundTripper(
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mhttp.WithRegistry(registry.DefaultRegistry),
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)
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return &http.Client{
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Transport: rt,
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}
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}
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func (s *service) Handle(pattern string, handler http.Handler) {
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var seen bool
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for _, ep := range s.srv.Endpoints {
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if ep.Name == pattern {
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seen = true
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break
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}
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}
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// if its unseen then add an endpoint
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if !seen {
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s.srv.Endpoints = append(s.srv.Endpoints, ®istry.Endpoint{
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Name: pattern,
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})
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}
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// disable static serving
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if pattern == "/" {
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s.Lock()
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s.static = false
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s.Unlock()
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}
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// register the handler
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s.mux.Handle(pattern, handler)
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}
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func (s *service) HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request)) {
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var seen bool
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for _, ep := range s.srv.Endpoints {
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if ep.Name == pattern {
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seen = true
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break
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}
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}
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if !seen {
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s.srv.Endpoints = append(s.srv.Endpoints, ®istry.Endpoint{
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Name: pattern,
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})
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}
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s.mux.HandleFunc(pattern, handler)
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}
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func (s *service) Init(opts ...Option) error {
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for _, o := range opts {
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o(&s.opts)
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}
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serviceOpts := []micro.Option{}
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if len(s.opts.Flags) > 0 {
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serviceOpts = append(serviceOpts, micro.Flags(s.opts.Flags...))
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}
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if s.opts.Registry != nil {
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serviceOpts = append(serviceOpts, micro.Registry(s.opts.Registry))
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}
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serviceOpts = append(serviceOpts, micro.Action(func(ctx *cli.Context) {
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if ttl := ctx.Int("register_ttl"); ttl > 0 {
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s.opts.RegisterTTL = time.Duration(ttl) * time.Second
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}
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if interval := ctx.Int("register_interval"); interval > 0 {
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s.opts.RegisterInterval = time.Duration(interval) * time.Second
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}
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if name := ctx.String("server_name"); len(name) > 0 {
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s.opts.Name = name
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}
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if ver := ctx.String("server_version"); len(ver) > 0 {
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s.opts.Version = ver
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}
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if id := ctx.String("server_id"); len(id) > 0 {
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s.opts.Id = id
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}
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if addr := ctx.String("server_address"); len(addr) > 0 {
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s.opts.Address = addr
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}
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if adv := ctx.String("server_advertise"); len(adv) > 0 {
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s.opts.Advertise = adv
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}
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if s.opts.Action != nil {
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s.opts.Action(ctx)
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}
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}))
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s.opts.Service.Init(serviceOpts...)
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srv := s.genSrv()
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srv.Endpoints = s.srv.Endpoints
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s.srv = srv
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return nil
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}
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func (s *service) Run() error {
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if err := s.start(); err != nil {
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return err
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}
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if err := s.register(); err != nil {
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return err
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}
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// start reg loop
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ex := make(chan bool)
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go s.run(ex)
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ch := make(chan os.Signal, 1)
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signal.Notify(ch, syscall.SIGTERM, syscall.SIGINT, syscall.SIGKILL)
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select {
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// wait on kill signal
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case sig := <-ch:
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log.Logf("Received signal %s\n", sig)
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// wait on context cancel
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case <-s.opts.Context.Done():
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log.Logf("Received context shutdown")
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}
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// exit reg loop
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close(ex)
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if err := s.deregister(); err != nil {
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return err
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}
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return s.stop()
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}
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// Options returns the options for the given service
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func (s *service) Options() Options {
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return s.opts
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}
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func (s *service) listen(network, addr string) (net.Listener, error) {
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var l net.Listener
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var err error
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// TODO: support use of listen options
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if s.opts.Secure || s.opts.TLSConfig != nil {
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config := s.opts.TLSConfig
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fn := func(addr string) (net.Listener, error) {
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if config == nil {
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hosts := []string{addr}
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// check if its a valid host:port
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if host, _, err := net.SplitHostPort(addr); err == nil {
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if len(host) == 0 {
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hosts = maddr.IPs()
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} else {
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hosts = []string{host}
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}
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}
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// generate a certificate
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cert, err := mls.Certificate(hosts...)
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|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
config = &tls.Config{Certificates: []tls.Certificate{cert}}
|
|
|
|
}
|
|
|
|
return tls.Listen(network, addr, config)
|
|
|
|
}
|
|
|
|
|
|
|
|
l, err = mnet.Listen(addr, fn)
|
|
|
|
} else {
|
|
|
|
fn := func(addr string) (net.Listener, error) {
|
|
|
|
return net.Listen(network, addr)
|
|
|
|
}
|
|
|
|
|
|
|
|
l, err = mnet.Listen(addr, fn)
|
|
|
|
}
|
|
|
|
|
|
|
|
if err != nil {
|
|
|
|
return nil, err
|
|
|
|
}
|
|
|
|
|
|
|
|
return l, nil
|
|
|
|
}
|