micro-server-http/http.go
Vasiliy Tolstov 7e46d86253 update for latest micro
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
2021-01-29 14:32:32 +03:00

403 lines
8.8 KiB
Go

// Package http implements a go-micro.Server
package http
import (
"crypto/tls"
"errors"
"fmt"
"net"
"net/http"
"sort"
"sync"
"time"
"github.com/unistack-org/micro/v3/broker"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/register"
"github.com/unistack-org/micro/v3/server"
"golang.org/x/net/netutil"
)
type httpServer struct {
sync.RWMutex
opts server.Options
hd server.Handler
exit chan chan error
subscribers map[*httpSubscriber][]broker.Subscriber
// used for first registration
registered bool
// register service instance
rsvc *register.Service
}
func (h *httpServer) newCodec(ct string) (codec.Codec, error) {
if cf, ok := h.opts.Codecs[ct]; ok {
return cf, nil
}
return nil, codec.ErrUnknownContentType
}
func (h *httpServer) Options() server.Options {
h.Lock()
opts := h.opts
h.Unlock()
return opts
}
func (h *httpServer) Init(opts ...server.Option) error {
h.Lock()
for _, o := range opts {
o(&h.opts)
}
h.Unlock()
return nil
}
func (h *httpServer) Handle(handler server.Handler) error {
if _, ok := handler.Handler().(http.Handler); !ok {
return errors.New("Handle requires http.Handler")
}
h.Lock()
h.hd = handler
h.Unlock()
return nil
}
func (h *httpServer) NewHandler(handler interface{}, opts ...server.HandlerOption) server.Handler {
options := server.NewHandlerOptions(opts...)
var eps []*register.Endpoint
if !options.Internal {
for name, metadata := range options.Metadata {
eps = append(eps, &register.Endpoint{
Name: name,
Metadata: metadata,
})
}
}
return &httpHandler{
eps: eps,
hd: handler,
opts: options,
}
}
func (h *httpServer) NewSubscriber(topic string, handler interface{}, opts ...server.SubscriberOption) server.Subscriber {
return newSubscriber(topic, handler, opts...)
}
func (h *httpServer) Subscribe(sb server.Subscriber) error {
sub, ok := sb.(*httpSubscriber)
if !ok {
return fmt.Errorf("invalid subscriber: expected *httpSubscriber")
}
if len(sub.handlers) == 0 {
return fmt.Errorf("invalid subscriber: no handler functions")
}
if err := server.ValidateSubscriber(sb); err != nil {
return err
}
h.Lock()
defer h.Unlock()
_, ok = h.subscribers[sub]
if ok {
return fmt.Errorf("subscriber %v already exists", h)
}
h.subscribers[sub] = nil
return nil
}
func (h *httpServer) Register() error {
h.RLock()
eps := h.hd.Endpoints()
rsvc := h.rsvc
config := h.opts
h.RUnlock()
// if service already filled, reuse it and return early
if rsvc != nil {
if err := server.DefaultRegisterFunc(rsvc, config); err != nil {
return err
}
return nil
}
service, err := server.NewRegisterService(h)
if err != nil {
return err
}
service.Nodes[0].Metadata["protocol"] = "http"
service.Endpoints = eps
h.Lock()
var subscriberList []*httpSubscriber
for e := range h.subscribers {
// Only advertise non internal subscribers
if !e.Options().Internal {
subscriberList = append(subscriberList, e)
}
}
sort.Slice(subscriberList, func(i, j int) bool {
return subscriberList[i].topic > subscriberList[j].topic
})
for _, e := range subscriberList {
service.Endpoints = append(service.Endpoints, e.Endpoints()...)
}
h.Unlock()
h.RLock()
registered := h.registered
h.RUnlock()
if !registered {
if config.Logger.V(logger.InfoLevel) {
config.Logger.Infof(config.Context, "Register [%s] Registering node: %s", config.Register.String(), service.Nodes[0].Id)
}
}
// register the service
if err := server.DefaultRegisterFunc(service, config); err != nil {
return err
}
// already registered? don't need to register subscribers
if registered {
return nil
}
h.Lock()
defer h.Unlock()
for sb := range h.subscribers {
handler := h.createSubHandler(sb, config)
var opts []broker.SubscribeOption
if queue := sb.Options().Queue; len(queue) > 0 {
opts = append(opts, broker.SubscribeGroup(queue))
}
subCtx := config.Context
if cx := sb.Options().Context; cx != nil {
subCtx = cx
}
opts = append(opts, broker.SubscribeContext(subCtx))
opts = append(opts, broker.SubscribeAutoAck(sb.Options().AutoAck))
sub, err := config.Broker.Subscribe(subCtx, sb.Topic(), handler, opts...)
if err != nil {
return err
}
h.subscribers[sb] = []broker.Subscriber{sub}
}
h.registered = true
h.rsvc = service
return nil
}
func (h *httpServer) Deregister() error {
h.RLock()
config := h.opts
h.RUnlock()
service, err := server.NewRegisterService(h)
if err != nil {
return err
}
if config.Logger.V(logger.InfoLevel) {
config.Logger.Infof(config.Context, "Deregistering node: %s", service.Nodes[0].Id)
}
if err := server.DefaultDeregisterFunc(service, config); err != nil {
return err
}
h.Lock()
h.rsvc = nil
if !h.registered {
h.Unlock()
return nil
}
h.registered = false
subCtx := h.opts.Context
for sb, subs := range h.subscribers {
if cx := sb.Options().Context; cx != nil {
subCtx = cx
}
for _, sub := range subs {
config.Logger.Infof(config.Context, "Unsubscribing from topic: %s", sub.Topic())
if err := sub.Unsubscribe(subCtx); err != nil {
config.Logger.Errorf(config.Context, "failed to unsubscribe topic: %s, error: %v", sb.Topic(), err)
return err
}
}
h.subscribers[sb] = nil
}
h.Unlock()
return nil
}
func (h *httpServer) Start() error {
h.RLock()
config := h.opts
hd := h.hd
h.RUnlock()
if hd == nil {
return errors.New("Server required http.Handler")
}
// micro: config.Transport.Listen(config.Address)
var ts net.Listener
if l := config.Listener; l != nil {
ts = l
} else {
var err error
// check the tls config for secure connect
if tc := config.TLSConfig; tc != nil {
ts, err = tls.Listen("tcp", config.Address, tc)
// otherwise just plain tcp listener
} else {
ts, err = net.Listen("tcp", config.Address)
}
if err != nil {
return err
}
}
if config.MaxConn > 0 {
ts = netutil.LimitListener(ts, config.MaxConn)
}
if config.Logger.V(logger.InfoLevel) {
config.Logger.Infof(config.Context, "Listening on %s", ts.Addr().String())
}
h.Lock()
h.opts.Address = ts.Addr().String()
h.Unlock()
handler, ok := hd.Handler().(http.Handler)
if !ok {
return errors.New("Server required http.Handler")
}
if err := config.Broker.Connect(h.opts.Context); err != nil {
return err
}
if err := config.RegisterCheck(h.opts.Context); err != nil {
if config.Logger.V(logger.ErrorLevel) {
config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s", config.Name, config.Id, err)
}
} else {
if err = h.Register(); err != nil {
return err
}
}
go http.Serve(ts, handler)
go func() {
t := new(time.Ticker)
// only process if it exists
if config.RegisterInterval > time.Duration(0) {
// new ticker
t = time.NewTicker(config.RegisterInterval)
}
// return error chan
var ch chan error
Loop:
for {
select {
// register self on interval
case <-t.C:
h.RLock()
registered := h.registered
h.RUnlock()
rerr := config.RegisterCheck(h.opts.Context)
if rerr != nil && registered {
if config.Logger.V(logger.ErrorLevel) {
config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s, deregister it", config.Name, config.Id, rerr)
}
// deregister self in case of error
if err := h.Deregister(); err != nil {
if config.Logger.V(logger.ErrorLevel) {
config.Logger.Errorf(config.Context, "Server %s-%s deregister error: %s", config.Name, config.Id, err)
}
}
} else if rerr != nil && !registered {
if config.Logger.V(logger.ErrorLevel) {
config.Logger.Errorf(config.Context, "Server %s-%s register check error: %s", config.Name, config.Id, rerr)
}
continue
}
if err := h.Register(); err != nil {
if config.Logger.V(logger.ErrorLevel) {
config.Logger.Errorf(config.Context, "Server %s-%s register error: %s", config.Name, config.Id, err)
}
}
if err := h.Register(); err != nil {
config.Logger.Errorf(config.Context, "Server register error: %s", err)
}
// wait for exit
case ch = <-h.exit:
break Loop
}
}
ch <- ts.Close()
// deregister
if err := h.Deregister(); err != nil {
config.Logger.Errorf(config.Context, "Server deregister error: %s", err)
}
if err := config.Broker.Disconnect(config.Context); err != nil {
config.Logger.Errorf(config.Context, "Broker disconnect error: %s", err)
}
}()
return nil
}
func (h *httpServer) Stop() error {
ch := make(chan error)
h.exit <- ch
return <-ch
}
func (h *httpServer) String() string {
return "http"
}
func (h *httpServer) Name() string {
return h.opts.Name
}
func NewServer(opts ...server.Option) server.Server {
options := server.NewOptions(opts...)
return &httpServer{
opts: options,
exit: make(chan chan error),
subscribers: make(map[*httpSubscriber][]broker.Subscriber),
}
}