784 lines
16 KiB
Go
784 lines
16 KiB
Go
package server
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import (
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"context"
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"fmt"
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"net"
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"runtime/debug"
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"sort"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/micro/go-micro/broker"
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"github.com/micro/go-micro/codec"
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"github.com/micro/go-micro/metadata"
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/transport"
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"github.com/micro/go-micro/util/addr"
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log "github.com/micro/go-micro/util/log"
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mnet "github.com/micro/go-micro/util/net"
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"github.com/micro/go-micro/util/socket"
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)
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type rpcServer struct {
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router *router
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exit chan chan error
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sync.RWMutex
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opts Options
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handlers map[string]Handler
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subscribers map[*subscriber][]broker.Subscriber
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// marks the serve as started
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started bool
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// used for first registration
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registered bool
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// graceful exit
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wg *sync.WaitGroup
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}
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func newRpcServer(opts ...Option) Server {
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options := newOptions(opts...)
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router := newRpcRouter()
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router.hdlrWrappers = options.HdlrWrappers
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return &rpcServer{
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opts: options,
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router: router,
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handlers: make(map[string]Handler),
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subscribers: make(map[*subscriber][]broker.Subscriber),
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exit: make(chan chan error),
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wg: wait(options.Context),
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}
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}
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type rpcRouter struct {
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h func(context.Context, Request, interface{}) error
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}
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func (r rpcRouter) ServeRequest(ctx context.Context, req Request, rsp Response) error {
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return r.h(ctx, req, rsp)
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}
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// ServeConn serves a single connection
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func (s *rpcServer) ServeConn(sock transport.Socket) {
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var wg sync.WaitGroup
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var mtx sync.RWMutex
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// streams are multiplexed on Micro-Stream or Micro-Id header
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sockets := make(map[string]*socket.Socket)
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defer func() {
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// wait till done
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wg.Wait()
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// close underlying socket
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sock.Close()
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// close the sockets
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mtx.Lock()
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for id, psock := range sockets {
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psock.Close()
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delete(sockets, id)
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}
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mtx.Unlock()
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// recover any panics
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if r := recover(); r != nil {
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log.Log("panic recovered: ", r)
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log.Log(string(debug.Stack()))
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}
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}()
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for {
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var msg transport.Message
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if err := sock.Recv(&msg); err != nil {
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return
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}
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// use Micro-Stream as the stream identifier
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// in the event its blank we'll always process
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// on the same socket
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id := msg.Header["Micro-Stream"]
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// if there's no stream id then its a standard request
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// use the Micro-Id
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if len(id) == 0 {
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id = msg.Header["Micro-Id"]
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}
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// we're starting processing
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wg.Add(1)
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// add to wait group if "wait" is opt-in
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if s.wg != nil {
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s.wg.Add(1)
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}
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// check we have an existing socket
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mtx.RLock()
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psock, ok := sockets[id]
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mtx.RUnlock()
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// got the socket
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if ok {
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// accept the message
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if err := psock.Accept(&msg); err != nil {
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// delete the socket
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mtx.Lock()
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delete(sockets, id)
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mtx.Unlock()
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}
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// done(1)
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if s.wg != nil {
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s.wg.Done()
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}
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wg.Done()
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// continue to the next message
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continue
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}
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// no socket was found
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psock = socket.New()
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psock.SetLocal(sock.Local())
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psock.SetRemote(sock.Remote())
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// load the socket
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psock.Accept(&msg)
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// save a new socket
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mtx.Lock()
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sockets[id] = psock
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mtx.Unlock()
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// wait for processing to exit
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wg.Add(1)
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// process the outbound messages from the socket
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go func(id string, psock *socket.Socket) {
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defer func() {
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wg.Done()
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}()
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for {
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// get the message from our internal handler/stream
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m := new(transport.Message)
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if err := psock.Process(m); err != nil {
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// delete the socket
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mtx.Lock()
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delete(sockets, id)
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mtx.Unlock()
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return
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}
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// send the message back over the socket
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if err := sock.Send(m); err != nil {
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return
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}
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}
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}(id, psock)
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// now walk the usual path
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// we use this Timeout header to set a server deadline
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to := msg.Header["Timeout"]
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// we use this Content-Type header to identify the codec needed
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ct := msg.Header["Content-Type"]
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// copy the message headers
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hdr := make(map[string]string)
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for k, v := range msg.Header {
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hdr[k] = v
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}
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// set local/remote ips
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hdr["Local"] = sock.Local()
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hdr["Remote"] = sock.Remote()
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// create new context with the metadata
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ctx := metadata.NewContext(context.Background(), hdr)
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// set the timeout from the header if we have it
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if len(to) > 0 {
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if n, err := strconv.ParseUint(to, 10, 64); err == nil {
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ctx, _ = context.WithTimeout(ctx, time.Duration(n))
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}
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}
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// if there's no content type default it
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if len(ct) == 0 {
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msg.Header["Content-Type"] = DefaultContentType
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ct = DefaultContentType
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}
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// setup old protocol
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cf := setupProtocol(&msg)
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// no old codec
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if cf == nil {
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// TODO: needs better error handling
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var err error
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if cf, err = s.newCodec(ct); err != nil {
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sock.Send(&transport.Message{
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Header: map[string]string{
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"Content-Type": "text/plain",
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},
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Body: []byte(err.Error()),
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})
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if s.wg != nil {
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s.wg.Done()
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}
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wg.Done()
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return
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}
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}
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rcodec := newRpcCodec(&msg, psock, cf)
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// check stream id
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var stream bool
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if v := getHeader("Micro-Stream", msg.Header); len(v) > 0 {
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stream = true
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}
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// internal request
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request := &rpcRequest{
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service: getHeader("Micro-Service", msg.Header),
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method: getHeader("Micro-Method", msg.Header),
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endpoint: getHeader("Micro-Endpoint", msg.Header),
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contentType: ct,
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codec: rcodec,
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header: msg.Header,
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body: msg.Body,
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socket: psock,
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stream: stream,
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}
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// internal response
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response := &rpcResponse{
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header: make(map[string]string),
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socket: psock,
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codec: rcodec,
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}
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// set router
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r := Router(s.router)
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// if not nil use the router specified
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if s.opts.Router != nil {
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// create a wrapped function
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handler := func(ctx context.Context, req Request, rsp interface{}) error {
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return s.opts.Router.ServeRequest(ctx, req, rsp.(Response))
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}
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// execute the wrapper for it
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for i := len(s.opts.HdlrWrappers); i > 0; i-- {
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handler = s.opts.HdlrWrappers[i-1](handler)
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}
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// set the router
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r = rpcRouter{handler}
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}
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// serve the request in a go routine as this may be a stream
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go func(id string, psock *socket.Socket) {
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defer psock.Close()
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// serve the actual request using the request router
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if err := r.ServeRequest(ctx, request, response); err != nil {
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// write an error response
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err = rcodec.Write(&codec.Message{
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Header: msg.Header,
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Error: err.Error(),
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Type: codec.Error,
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}, nil)
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// could not write the error response
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if err != nil {
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log.Logf("rpc: unable to write error response: %v", err)
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}
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}
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mtx.Lock()
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delete(sockets, id)
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mtx.Unlock()
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// signal we're done
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if s.wg != nil {
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s.wg.Done()
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}
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// done with this socket
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wg.Done()
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}(id, psock)
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}
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}
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func (s *rpcServer) newCodec(contentType string) (codec.NewCodec, error) {
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if cf, ok := s.opts.Codecs[contentType]; ok {
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return cf, nil
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}
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if cf, ok := DefaultCodecs[contentType]; ok {
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return cf, nil
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}
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return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
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}
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func (s *rpcServer) Options() Options {
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s.RLock()
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opts := s.opts
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s.RUnlock()
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return opts
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}
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func (s *rpcServer) Init(opts ...Option) error {
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s.Lock()
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for _, opt := range opts {
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opt(&s.opts)
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}
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// update router if its the default
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if s.opts.Router == nil {
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r := newRpcRouter()
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r.hdlrWrappers = s.opts.HdlrWrappers
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r.serviceMap = s.router.serviceMap
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s.router = r
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}
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s.Unlock()
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return nil
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}
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func (s *rpcServer) NewHandler(h interface{}, opts ...HandlerOption) Handler {
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return s.router.NewHandler(h, opts...)
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}
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func (s *rpcServer) Handle(h Handler) error {
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s.Lock()
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defer s.Unlock()
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if err := s.router.Handle(h); err != nil {
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return err
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}
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s.handlers[h.Name()] = h
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return nil
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}
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func (s *rpcServer) NewSubscriber(topic string, sb interface{}, opts ...SubscriberOption) Subscriber {
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return newSubscriber(topic, sb, opts...)
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}
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func (s *rpcServer) Subscribe(sb Subscriber) error {
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sub, ok := sb.(*subscriber)
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if !ok {
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return fmt.Errorf("invalid subscriber: expected *subscriber")
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}
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if len(sub.handlers) == 0 {
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return fmt.Errorf("invalid subscriber: no handler functions")
|
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}
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|
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if err := validateSubscriber(sb); err != nil {
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return err
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}
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s.Lock()
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defer s.Unlock()
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_, ok = s.subscribers[sub]
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if ok {
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return fmt.Errorf("subscriber %v already exists", s)
|
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}
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s.subscribers[sub] = nil
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return nil
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}
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func (s *rpcServer) Register() error {
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var err error
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var advt, host, port string
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// parse address for host, port
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config := s.Options()
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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(config.Advertise) > 0 {
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advt = config.Advertise
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} else {
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advt = config.Address
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}
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if cnt := strings.Count(advt, ":"); cnt >= 1 {
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// ipv6 address in format [host]:port or ipv4 host:port
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host, port, err = net.SplitHostPort(advt)
|
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if err != nil {
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return err
|
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}
|
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} else {
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host = advt
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}
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|
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addr, err := addr.Extract(host)
|
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if err != nil {
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return err
|
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}
|
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|
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// make copy of metadata
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md := make(metadata.Metadata)
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for k, v := range config.Metadata {
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md[k] = v
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}
|
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|
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// mq-rpc(eg. nats) doesn't need the port. its addr is queue name.
|
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if port != "" {
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addr = mnet.HostPort(addr, port)
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}
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|
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// register service
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node := ®istry.Node{
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Id: config.Name + "-" + config.Id,
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Address: addr,
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Metadata: md,
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}
|
|
|
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node.Metadata["transport"] = config.Transport.String()
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node.Metadata["broker"] = config.Broker.String()
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node.Metadata["server"] = s.String()
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node.Metadata["registry"] = config.Registry.String()
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node.Metadata["protocol"] = "mucp"
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|
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s.RLock()
|
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// Maps are ordered randomly, sort the keys for consistency
|
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var handlerList []string
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for n, e := range s.handlers {
|
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// Only advertise non internal handlers
|
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if !e.Options().Internal {
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handlerList = append(handlerList, n)
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}
|
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}
|
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sort.Strings(handlerList)
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|
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var subscriberList []*subscriber
|
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for e := range s.subscribers {
|
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// Only advertise non internal subscribers
|
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if !e.Options().Internal {
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|
subscriberList = append(subscriberList, e)
|
|
}
|
|
}
|
|
sort.Slice(subscriberList, func(i, j int) bool {
|
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return subscriberList[i].topic > subscriberList[j].topic
|
|
})
|
|
|
|
var endpoints []*registry.Endpoint
|
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for _, n := range handlerList {
|
|
endpoints = append(endpoints, s.handlers[n].Endpoints()...)
|
|
}
|
|
for _, e := range subscriberList {
|
|
endpoints = append(endpoints, e.Endpoints()...)
|
|
}
|
|
s.RUnlock()
|
|
|
|
service := ®istry.Service{
|
|
Name: config.Name,
|
|
Version: config.Version,
|
|
Nodes: []*registry.Node{node},
|
|
Endpoints: endpoints,
|
|
}
|
|
|
|
s.Lock()
|
|
registered := s.registered
|
|
s.Unlock()
|
|
|
|
if !registered {
|
|
log.Logf("Registry [%s] Registering node: %s", config.Registry.String(), node.Id)
|
|
}
|
|
|
|
// create registry options
|
|
rOpts := []registry.RegisterOption{registry.RegisterTTL(config.RegisterTTL)}
|
|
|
|
if err := config.Registry.Register(service, rOpts...); err != nil {
|
|
return err
|
|
}
|
|
|
|
// already registered? don't need to register subscribers
|
|
if registered {
|
|
return nil
|
|
}
|
|
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
|
|
s.registered = true
|
|
|
|
for sb, _ := range s.subscribers {
|
|
handler := s.createSubHandler(sb, s.opts)
|
|
var opts []broker.SubscribeOption
|
|
if queue := sb.Options().Queue; len(queue) > 0 {
|
|
opts = append(opts, broker.Queue(queue))
|
|
}
|
|
|
|
if cx := sb.Options().Context; cx != nil {
|
|
opts = append(opts, broker.SubscribeContext(cx))
|
|
}
|
|
|
|
if !sb.Options().AutoAck {
|
|
opts = append(opts, broker.DisableAutoAck())
|
|
}
|
|
|
|
sub, err := config.Broker.Subscribe(sb.Topic(), handler, opts...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
log.Logf("Subscribing %s to topic: %s", node.Id, sub.Topic())
|
|
s.subscribers[sb] = []broker.Subscriber{sub}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *rpcServer) Deregister() error {
|
|
var err error
|
|
var advt, host, port string
|
|
|
|
config := s.Options()
|
|
|
|
// check the advertise address first
|
|
// if it exists then use it, otherwise
|
|
// use the address
|
|
if len(config.Advertise) > 0 {
|
|
advt = config.Advertise
|
|
} else {
|
|
advt = config.Address
|
|
}
|
|
|
|
if cnt := strings.Count(advt, ":"); cnt >= 1 {
|
|
// ipv6 address in format [host]:port or ipv4 host:port
|
|
host, port, err = net.SplitHostPort(advt)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else {
|
|
host = advt
|
|
}
|
|
|
|
addr, err := addr.Extract(host)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// mq-rpc(eg. nats) doesn't need the port. its addr is queue name.
|
|
if port != "" {
|
|
addr = mnet.HostPort(addr, port)
|
|
}
|
|
|
|
node := ®istry.Node{
|
|
Id: config.Name + "-" + config.Id,
|
|
Address: addr,
|
|
}
|
|
|
|
service := ®istry.Service{
|
|
Name: config.Name,
|
|
Version: config.Version,
|
|
Nodes: []*registry.Node{node},
|
|
}
|
|
|
|
log.Logf("Registry [%s] Deregistering node: %s", config.Registry.String(), node.Id)
|
|
if err := config.Registry.Deregister(service); err != nil {
|
|
return err
|
|
}
|
|
|
|
s.Lock()
|
|
|
|
if !s.registered {
|
|
s.Unlock()
|
|
return nil
|
|
}
|
|
|
|
s.registered = false
|
|
|
|
for sb, subs := range s.subscribers {
|
|
for _, sub := range subs {
|
|
log.Logf("Unsubscribing %s from topic: %s", node.Id, sub.Topic())
|
|
sub.Unsubscribe()
|
|
}
|
|
s.subscribers[sb] = nil
|
|
}
|
|
|
|
s.Unlock()
|
|
return nil
|
|
}
|
|
|
|
func (s *rpcServer) Start() error {
|
|
s.RLock()
|
|
if s.started {
|
|
s.RUnlock()
|
|
return nil
|
|
}
|
|
s.RUnlock()
|
|
|
|
config := s.Options()
|
|
|
|
// start listening on the transport
|
|
ts, err := config.Transport.Listen(config.Address)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
log.Logf("Transport [%s] Listening on %s", config.Transport.String(), ts.Addr())
|
|
|
|
// swap address
|
|
s.Lock()
|
|
addr := s.opts.Address
|
|
s.opts.Address = ts.Addr()
|
|
s.Unlock()
|
|
|
|
// connect to the broker
|
|
if err := config.Broker.Connect(); err != nil {
|
|
return err
|
|
}
|
|
|
|
bname := config.Broker.String()
|
|
|
|
log.Logf("Broker [%s] Connected to %s", bname, config.Broker.Address())
|
|
|
|
// use RegisterCheck func before register
|
|
if err = s.opts.RegisterCheck(s.opts.Context); err != nil {
|
|
log.Logf("Server %s-%s register check error: %s", config.Name, config.Id, err)
|
|
} else {
|
|
// announce self to the world
|
|
if err = s.Register(); err != nil {
|
|
log.Logf("Server %s-%s register error: %s", config.Name, config.Id, err)
|
|
}
|
|
}
|
|
|
|
exit := make(chan bool)
|
|
|
|
go func() {
|
|
for {
|
|
// listen for connections
|
|
err := ts.Accept(s.ServeConn)
|
|
|
|
// TODO: listen for messages
|
|
// msg := broker.Exchange(service).Consume()
|
|
|
|
select {
|
|
// check if we're supposed to exit
|
|
case <-exit:
|
|
return
|
|
// check the error and backoff
|
|
default:
|
|
if err != nil {
|
|
log.Logf("Accept error: %v", err)
|
|
time.Sleep(time.Second)
|
|
continue
|
|
}
|
|
}
|
|
|
|
// no error just exit
|
|
return
|
|
}
|
|
}()
|
|
|
|
go func() {
|
|
t := new(time.Ticker)
|
|
|
|
// only process if it exists
|
|
if s.opts.RegisterInterval > time.Duration(0) {
|
|
// new ticker
|
|
t = time.NewTicker(s.opts.RegisterInterval)
|
|
}
|
|
|
|
// return error chan
|
|
var ch chan error
|
|
|
|
Loop:
|
|
for {
|
|
select {
|
|
// register self on interval
|
|
case <-t.C:
|
|
s.RLock()
|
|
registered := s.registered
|
|
s.RUnlock()
|
|
if err = s.opts.RegisterCheck(s.opts.Context); err != nil && registered {
|
|
log.Logf("Server %s-%s register check error: %s, deregister it", config.Name, config.Id, err)
|
|
// deregister self in case of error
|
|
if err := s.Deregister(); err != nil {
|
|
log.Logf("Server %s-%s deregister error: %s", config.Name, config.Id, err)
|
|
}
|
|
} else {
|
|
if err := s.Register(); err != nil {
|
|
log.Logf("Server %s-%s register error: %s", config.Name, config.Id, err)
|
|
}
|
|
}
|
|
// wait for exit
|
|
case ch = <-s.exit:
|
|
t.Stop()
|
|
close(exit)
|
|
break Loop
|
|
}
|
|
}
|
|
|
|
// deregister self
|
|
if err := s.Deregister(); err != nil {
|
|
log.Logf("Server %s-%s deregister error: %s", config.Name, config.Id, err)
|
|
}
|
|
|
|
// wait for requests to finish
|
|
if s.wg != nil {
|
|
s.wg.Wait()
|
|
}
|
|
|
|
// close transport listener
|
|
ch <- ts.Close()
|
|
|
|
// disconnect the broker
|
|
config.Broker.Disconnect()
|
|
|
|
// swap back address
|
|
s.Lock()
|
|
s.opts.Address = addr
|
|
s.Unlock()
|
|
}()
|
|
|
|
// mark the server as started
|
|
s.Lock()
|
|
s.started = true
|
|
s.Unlock()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *rpcServer) Stop() error {
|
|
s.RLock()
|
|
if !s.started {
|
|
s.RUnlock()
|
|
return nil
|
|
}
|
|
s.RUnlock()
|
|
|
|
ch := make(chan error)
|
|
s.exit <- ch
|
|
|
|
var err error
|
|
select {
|
|
case err = <-ch:
|
|
s.Lock()
|
|
s.started = false
|
|
s.Unlock()
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func (s *rpcServer) String() string {
|
|
return "mucp"
|
|
}
|