micro-server-http/http.go

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// Package http implements a go-micro.Server
package http
import (
"errors"
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"fmt"
"net"
"net/http"
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"sort"
"sync"
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"time"
"github.com/unistack-org/micro/v3/broker"
"github.com/unistack-org/micro/v3/codec"
jsonrpc "github.com/unistack-org/micro/v3/codec/jsonrpc"
protorpc "github.com/unistack-org/micro/v3/codec/protorpc"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/registry"
"github.com/unistack-org/micro/v3/server"
regutil "github.com/unistack-org/micro/v3/util/registry"
)
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var (
defaultCodecs = map[string]codec.NewCodec{
"application/json": jsonrpc.NewCodec,
"application/json-rpc": jsonrpc.NewCodec,
"application/protobuf": protorpc.NewCodec,
"application/proto-rpc": protorpc.NewCodec,
"application/octet-stream": protorpc.NewCodec,
}
)
type httpServer struct {
sync.RWMutex
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opts server.Options
hd server.Handler
exit chan chan error
registerOnce sync.Once
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subscribers map[*httpSubscriber][]broker.Subscriber
// used for first registration
registered bool
}
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func (h *httpServer) newCodec(contentType string) (codec.NewCodec, error) {
if cf, ok := h.opts.Codecs[contentType]; ok {
return cf, nil
}
if cf, ok := defaultCodecs[contentType]; ok {
return cf, nil
}
return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
}
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.HandlerOptions{
Metadata: make(map[string]map[string]string),
}
for _, o := range opts {
o(&options)
}
var eps []*registry.Endpoint
if !options.Internal {
for name, metadata := range options.Metadata {
eps = append(eps, &registry.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 {
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return newSubscriber(topic, handler, opts...)
}
func (h *httpServer) Subscribe(sb server.Subscriber) error {
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sub, ok := sb.(*httpSubscriber)
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if !ok {
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return fmt.Errorf("invalid subscriber: expected *httpSubscriber")
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}
if len(sub.handlers) == 0 {
return fmt.Errorf("invalid subscriber: no handler functions")
}
if err := server.ValidateSubscriber(sb); err != nil {
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return err
}
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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.Lock()
opts := h.opts
eps := h.hd.Endpoints()
h.Unlock()
service, err := regutil.NewService(h)
if err != nil {
return err
}
if len(service.Metadata) == 0 {
service.Metadata = make(map[string]string, 5)
}
service.Metadata["protocol"] = "http"
service.Endpoints = eps
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h.Lock()
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var subscriberList []*httpSubscriber
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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()
rOpts := []registry.RegisterOption{
registry.RegisterTTL(opts.RegisterTTL),
}
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h.registerOnce.Do(func() {
logger.Infof("Registering node: %s", opts.Name+"-"+opts.Id)
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})
if err := opts.Registry.Register(service, rOpts...); err != nil {
return err
}
h.Lock()
defer h.Unlock()
if h.registered {
return nil
}
h.registered = true
for sb := range h.subscribers {
handler := h.createSubHandler(sb, opts)
var subOpts []broker.SubscribeOption
if queue := sb.Options().Queue; len(queue) > 0 {
subOpts = append(subOpts, broker.Queue(queue))
}
if !sb.Options().AutoAck {
subOpts = append(subOpts, broker.DisableAutoAck())
}
sub, err := opts.Broker.Subscribe(sb.Topic(), handler, subOpts...)
if err != nil {
return err
}
h.subscribers[sb] = []broker.Subscriber{sub}
}
return nil
}
func (h *httpServer) Deregister() error {
h.Lock()
opts := h.opts
h.Unlock()
logger.Infof("Deregistering node: %s", opts.Name+"-"+opts.Id)
service, err := regutil.NewService(h)
if err != nil {
return err
}
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if err := opts.Registry.Deregister(service); err != nil {
return err
}
h.Lock()
if !h.registered {
h.Unlock()
return nil
}
h.registered = false
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for sb, subs := range h.subscribers {
for _, sub := range subs {
logger.Infof("Unsubscribing from topic: %s", sub.Topic())
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sub.Unsubscribe()
}
h.subscribers[sb] = nil
}
h.Unlock()
return nil
}
func (h *httpServer) Start() error {
h.Lock()
opts := h.opts
hd := h.hd
h.Unlock()
config := h.Options()
ln, err := net.Listen("tcp", opts.Address)
if err != nil {
return err
}
logger.Infof("Listening on %s", ln.Addr().String())
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h.Lock()
h.opts.Address = ln.Addr().String()
h.Unlock()
handler, ok := hd.Handler().(http.Handler)
if !ok {
return errors.New("Server required http.Handler")
}
if err = opts.Broker.Connect(); err != nil {
return err
}
if err = h.opts.RegisterCheck(h.opts.Context); err != nil {
if logger.V(logger.ErrorLevel) {
logger.Errorf("Server %s-%s register check error: %s", config.Name, config.Id, err)
}
} else {
if err = h.Register(); err != nil {
return err
}
}
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go http.Serve(ln, handler)
go func() {
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t := new(time.Ticker)
// only process if it exists
if opts.RegisterInterval > time.Duration(0) {
// new ticker
t = time.NewTicker(opts.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 := h.opts.RegisterCheck(h.opts.Context)
if rerr != nil && registered {
if logger.V(logger.ErrorLevel) {
logger.Errorf("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 logger.V(logger.ErrorLevel) {
logger.Errorf("Server %s-%s deregister error: %s", config.Name, config.Id, err)
}
}
} else if rerr != nil && !registered {
if logger.V(logger.ErrorLevel) {
logger.Errorf("Server %s-%s register check error: %s", config.Name, config.Id, rerr)
}
continue
}
if err := h.Register(); err != nil {
if logger.V(logger.ErrorLevel) {
logger.Errorf("Server %s-%s register error: %s", config.Name, config.Id, err)
}
}
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if err := h.Register(); err != nil {
logger.Error("Server register error: ", err)
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}
// wait for exit
case ch = <-h.exit:
break Loop
}
}
ch <- ln.Close()
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// deregister
h.Deregister()
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opts.Broker.Disconnect()
}()
return nil
}
func (h *httpServer) Stop() error {
ch := make(chan error)
h.exit <- ch
return <-ch
}
func (h *httpServer) String() string {
return "http"
}
func NewServer(opts ...server.Option) server.Server {
options := server.NewOptions(opts...)
return &httpServer{
opts: options,
exit: make(chan chan error),
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subscribers: make(map[*httpSubscriber][]broker.Subscriber),
}
}