traefik/vendor/google.golang.org/grpc/server.go

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/*
*
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* Copyright 2014 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
*/
package grpc
import (
"bytes"
"errors"
"fmt"
"io"
"net"
"net/http"
"reflect"
"runtime"
"strings"
"sync"
"time"
"golang.org/x/net/context"
"golang.org/x/net/http2"
"golang.org/x/net/trace"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/internal"
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"google.golang.org/grpc/keepalive"
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"google.golang.org/grpc/metadata"
"google.golang.org/grpc/stats"
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"google.golang.org/grpc/status"
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"google.golang.org/grpc/tap"
"google.golang.org/grpc/transport"
)
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const (
defaultServerMaxReceiveMessageSize = 1024 * 1024 * 4
defaultServerMaxSendMessageSize = 1024 * 1024 * 4
)
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type methodHandler func(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor UnaryServerInterceptor) (interface{}, error)
// MethodDesc represents an RPC service's method specification.
type MethodDesc struct {
MethodName string
Handler methodHandler
}
// ServiceDesc represents an RPC service's specification.
type ServiceDesc struct {
ServiceName string
// The pointer to the service interface. Used to check whether the user
// provided implementation satisfies the interface requirements.
HandlerType interface{}
Methods []MethodDesc
Streams []StreamDesc
Metadata interface{}
}
// service consists of the information of the server serving this service and
// the methods in this service.
type service struct {
server interface{} // the server for service methods
md map[string]*MethodDesc
sd map[string]*StreamDesc
mdata interface{}
}
// Server is a gRPC server to serve RPC requests.
type Server struct {
opts options
mu sync.Mutex // guards following
lis map[net.Listener]bool
conns map[io.Closer]bool
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serve bool
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drain bool
ctx context.Context
cancel context.CancelFunc
// A CondVar to let GracefulStop() blocks until all the pending RPCs are finished
// and all the transport goes away.
cv *sync.Cond
m map[string]*service // service name -> service info
events trace.EventLog
}
type options struct {
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creds credentials.TransportCredentials
codec Codec
cp Compressor
dc Decompressor
unaryInt UnaryServerInterceptor
streamInt StreamServerInterceptor
inTapHandle tap.ServerInHandle
statsHandler stats.Handler
maxConcurrentStreams uint32
maxReceiveMessageSize int
maxSendMessageSize int
useHandlerImpl bool // use http.Handler-based server
unknownStreamDesc *StreamDesc
keepaliveParams keepalive.ServerParameters
keepalivePolicy keepalive.EnforcementPolicy
initialWindowSize int32
initialConnWindowSize int32
}
var defaultServerOptions = options{
maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
maxSendMessageSize: defaultServerMaxSendMessageSize,
}
// A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
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type ServerOption func(*options)
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// InitialWindowSize returns a ServerOption that sets window size for stream.
// The lower bound for window size is 64K and any value smaller than that will be ignored.
func InitialWindowSize(s int32) ServerOption {
return func(o *options) {
o.initialWindowSize = s
}
}
// InitialConnWindowSize returns a ServerOption that sets window size for a connection.
// The lower bound for window size is 64K and any value smaller than that will be ignored.
func InitialConnWindowSize(s int32) ServerOption {
return func(o *options) {
o.initialConnWindowSize = s
}
}
// KeepaliveParams returns a ServerOption that sets keepalive and max-age parameters for the server.
func KeepaliveParams(kp keepalive.ServerParameters) ServerOption {
return func(o *options) {
o.keepaliveParams = kp
}
}
// KeepaliveEnforcementPolicy returns a ServerOption that sets keepalive enforcement policy for the server.
func KeepaliveEnforcementPolicy(kep keepalive.EnforcementPolicy) ServerOption {
return func(o *options) {
o.keepalivePolicy = kep
}
}
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// CustomCodec returns a ServerOption that sets a codec for message marshaling and unmarshaling.
func CustomCodec(codec Codec) ServerOption {
return func(o *options) {
o.codec = codec
}
}
// RPCCompressor returns a ServerOption that sets a compressor for outbound messages.
func RPCCompressor(cp Compressor) ServerOption {
return func(o *options) {
o.cp = cp
}
}
// RPCDecompressor returns a ServerOption that sets a decompressor for inbound messages.
func RPCDecompressor(dc Decompressor) ServerOption {
return func(o *options) {
o.dc = dc
}
}
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// MaxMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
// If this is not set, gRPC uses the default limit. Deprecated: use MaxRecvMsgSize instead.
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func MaxMsgSize(m int) ServerOption {
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return MaxRecvMsgSize(m)
}
// MaxRecvMsgSize returns a ServerOption to set the max message size in bytes the server can receive.
// If this is not set, gRPC uses the default 4MB.
func MaxRecvMsgSize(m int) ServerOption {
return func(o *options) {
o.maxReceiveMessageSize = m
}
}
// MaxSendMsgSize returns a ServerOption to set the max message size in bytes the server can send.
// If this is not set, gRPC uses the default 4MB.
func MaxSendMsgSize(m int) ServerOption {
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return func(o *options) {
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o.maxSendMessageSize = m
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}
}
// MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
// of concurrent streams to each ServerTransport.
func MaxConcurrentStreams(n uint32) ServerOption {
return func(o *options) {
o.maxConcurrentStreams = n
}
}
// Creds returns a ServerOption that sets credentials for server connections.
func Creds(c credentials.TransportCredentials) ServerOption {
return func(o *options) {
o.creds = c
}
}
// UnaryInterceptor returns a ServerOption that sets the UnaryServerInterceptor for the
// server. Only one unary interceptor can be installed. The construction of multiple
// interceptors (e.g., chaining) can be implemented at the caller.
func UnaryInterceptor(i UnaryServerInterceptor) ServerOption {
return func(o *options) {
if o.unaryInt != nil {
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panic("The unary server interceptor was already set and may not be reset.")
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}
o.unaryInt = i
}
}
// StreamInterceptor returns a ServerOption that sets the StreamServerInterceptor for the
// server. Only one stream interceptor can be installed.
func StreamInterceptor(i StreamServerInterceptor) ServerOption {
return func(o *options) {
if o.streamInt != nil {
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panic("The stream server interceptor was already set and may not be reset.")
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}
o.streamInt = i
}
}
// InTapHandle returns a ServerOption that sets the tap handle for all the server
// transport to be created. Only one can be installed.
func InTapHandle(h tap.ServerInHandle) ServerOption {
return func(o *options) {
if o.inTapHandle != nil {
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panic("The tap handle was already set and may not be reset.")
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}
o.inTapHandle = h
}
}
// StatsHandler returns a ServerOption that sets the stats handler for the server.
func StatsHandler(h stats.Handler) ServerOption {
return func(o *options) {
o.statsHandler = h
}
}
// UnknownServiceHandler returns a ServerOption that allows for adding a custom
// unknown service handler. The provided method is a bidi-streaming RPC service
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// handler that will be invoked instead of returning the "unimplemented" gRPC
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// error whenever a request is received for an unregistered service or method.
// The handling function has full access to the Context of the request and the
// stream, and the invocation passes through interceptors.
func UnknownServiceHandler(streamHandler StreamHandler) ServerOption {
return func(o *options) {
o.unknownStreamDesc = &StreamDesc{
StreamName: "unknown_service_handler",
Handler: streamHandler,
// We need to assume that the users of the streamHandler will want to use both.
ClientStreams: true,
ServerStreams: true,
}
}
}
// NewServer creates a gRPC server which has no service registered and has not
// started to accept requests yet.
func NewServer(opt ...ServerOption) *Server {
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opts := defaultServerOptions
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for _, o := range opt {
o(&opts)
}
if opts.codec == nil {
// Set the default codec.
opts.codec = protoCodec{}
}
s := &Server{
lis: make(map[net.Listener]bool),
opts: opts,
conns: make(map[io.Closer]bool),
m: make(map[string]*service),
}
s.cv = sync.NewCond(&s.mu)
s.ctx, s.cancel = context.WithCancel(context.Background())
if EnableTracing {
_, file, line, _ := runtime.Caller(1)
s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
}
return s
}
// printf records an event in s's event log, unless s has been stopped.
// REQUIRES s.mu is held.
func (s *Server) printf(format string, a ...interface{}) {
if s.events != nil {
s.events.Printf(format, a...)
}
}
// errorf records an error in s's event log, unless s has been stopped.
// REQUIRES s.mu is held.
func (s *Server) errorf(format string, a ...interface{}) {
if s.events != nil {
s.events.Errorf(format, a...)
}
}
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// RegisterService registers a service and its implementation to the gRPC
// server. It is called from the IDL generated code. This must be called before
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// invoking Serve.
func (s *Server) RegisterService(sd *ServiceDesc, ss interface{}) {
ht := reflect.TypeOf(sd.HandlerType).Elem()
st := reflect.TypeOf(ss)
if !st.Implements(ht) {
grpclog.Fatalf("grpc: Server.RegisterService found the handler of type %v that does not satisfy %v", st, ht)
}
s.register(sd, ss)
}
func (s *Server) register(sd *ServiceDesc, ss interface{}) {
s.mu.Lock()
defer s.mu.Unlock()
s.printf("RegisterService(%q)", sd.ServiceName)
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if s.serve {
grpclog.Fatalf("grpc: Server.RegisterService after Server.Serve for %q", sd.ServiceName)
}
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if _, ok := s.m[sd.ServiceName]; ok {
grpclog.Fatalf("grpc: Server.RegisterService found duplicate service registration for %q", sd.ServiceName)
}
srv := &service{
server: ss,
md: make(map[string]*MethodDesc),
sd: make(map[string]*StreamDesc),
mdata: sd.Metadata,
}
for i := range sd.Methods {
d := &sd.Methods[i]
srv.md[d.MethodName] = d
}
for i := range sd.Streams {
d := &sd.Streams[i]
srv.sd[d.StreamName] = d
}
s.m[sd.ServiceName] = srv
}
// MethodInfo contains the information of an RPC including its method name and type.
type MethodInfo struct {
// Name is the method name only, without the service name or package name.
Name string
// IsClientStream indicates whether the RPC is a client streaming RPC.
IsClientStream bool
// IsServerStream indicates whether the RPC is a server streaming RPC.
IsServerStream bool
}
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// ServiceInfo contains unary RPC method info, streaming RPC method info and metadata for a service.
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type ServiceInfo struct {
Methods []MethodInfo
// Metadata is the metadata specified in ServiceDesc when registering service.
Metadata interface{}
}
// GetServiceInfo returns a map from service names to ServiceInfo.
// Service names include the package names, in the form of <package>.<service>.
func (s *Server) GetServiceInfo() map[string]ServiceInfo {
ret := make(map[string]ServiceInfo)
for n, srv := range s.m {
methods := make([]MethodInfo, 0, len(srv.md)+len(srv.sd))
for m := range srv.md {
methods = append(methods, MethodInfo{
Name: m,
IsClientStream: false,
IsServerStream: false,
})
}
for m, d := range srv.sd {
methods = append(methods, MethodInfo{
Name: m,
IsClientStream: d.ClientStreams,
IsServerStream: d.ServerStreams,
})
}
ret[n] = ServiceInfo{
Methods: methods,
Metadata: srv.mdata,
}
}
return ret
}
var (
// ErrServerStopped indicates that the operation is now illegal because of
// the server being stopped.
ErrServerStopped = errors.New("grpc: the server has been stopped")
)
func (s *Server) useTransportAuthenticator(rawConn net.Conn) (net.Conn, credentials.AuthInfo, error) {
if s.opts.creds == nil {
return rawConn, nil, nil
}
return s.opts.creds.ServerHandshake(rawConn)
}
// Serve accepts incoming connections on the listener lis, creating a new
// ServerTransport and service goroutine for each. The service goroutines
// read gRPC requests and then call the registered handlers to reply to them.
// Serve returns when lis.Accept fails with fatal errors. lis will be closed when
// this method returns.
// Serve always returns non-nil error.
func (s *Server) Serve(lis net.Listener) error {
s.mu.Lock()
s.printf("serving")
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s.serve = true
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if s.lis == nil {
s.mu.Unlock()
lis.Close()
return ErrServerStopped
}
s.lis[lis] = true
s.mu.Unlock()
defer func() {
s.mu.Lock()
if s.lis != nil && s.lis[lis] {
lis.Close()
delete(s.lis, lis)
}
s.mu.Unlock()
}()
var tempDelay time.Duration // how long to sleep on accept failure
for {
rawConn, err := lis.Accept()
if err != nil {
if ne, ok := err.(interface {
Temporary() bool
}); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
s.mu.Lock()
s.printf("Accept error: %v; retrying in %v", err, tempDelay)
s.mu.Unlock()
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timer := time.NewTimer(tempDelay)
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select {
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case <-timer.C:
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case <-s.ctx.Done():
}
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timer.Stop()
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continue
}
s.mu.Lock()
s.printf("done serving; Accept = %v", err)
s.mu.Unlock()
return err
}
tempDelay = 0
// Start a new goroutine to deal with rawConn
// so we don't stall this Accept loop goroutine.
go s.handleRawConn(rawConn)
}
}
// handleRawConn is run in its own goroutine and handles a just-accepted
// connection that has not had any I/O performed on it yet.
func (s *Server) handleRawConn(rawConn net.Conn) {
conn, authInfo, err := s.useTransportAuthenticator(rawConn)
if err != nil {
s.mu.Lock()
s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
s.mu.Unlock()
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grpclog.Warningf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
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// If serverHandShake returns ErrConnDispatched, keep rawConn open.
if err != credentials.ErrConnDispatched {
rawConn.Close()
}
return
}
s.mu.Lock()
if s.conns == nil {
s.mu.Unlock()
conn.Close()
return
}
s.mu.Unlock()
if s.opts.useHandlerImpl {
s.serveUsingHandler(conn)
} else {
s.serveHTTP2Transport(conn, authInfo)
}
}
// serveHTTP2Transport sets up a http/2 transport (using the
// gRPC http2 server transport in transport/http2_server.go) and
// serves streams on it.
// This is run in its own goroutine (it does network I/O in
// transport.NewServerTransport).
func (s *Server) serveHTTP2Transport(c net.Conn, authInfo credentials.AuthInfo) {
config := &transport.ServerConfig{
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MaxStreams: s.opts.maxConcurrentStreams,
AuthInfo: authInfo,
InTapHandle: s.opts.inTapHandle,
StatsHandler: s.opts.statsHandler,
KeepaliveParams: s.opts.keepaliveParams,
KeepalivePolicy: s.opts.keepalivePolicy,
InitialWindowSize: s.opts.initialWindowSize,
InitialConnWindowSize: s.opts.initialConnWindowSize,
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}
st, err := transport.NewServerTransport("http2", c, config)
if err != nil {
s.mu.Lock()
s.errorf("NewServerTransport(%q) failed: %v", c.RemoteAddr(), err)
s.mu.Unlock()
c.Close()
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grpclog.Warningln("grpc: Server.Serve failed to create ServerTransport: ", err)
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return
}
if !s.addConn(st) {
st.Close()
return
}
s.serveStreams(st)
}
func (s *Server) serveStreams(st transport.ServerTransport) {
defer s.removeConn(st)
defer st.Close()
var wg sync.WaitGroup
st.HandleStreams(func(stream *transport.Stream) {
wg.Add(1)
go func() {
defer wg.Done()
s.handleStream(st, stream, s.traceInfo(st, stream))
}()
}, func(ctx context.Context, method string) context.Context {
if !EnableTracing {
return ctx
}
tr := trace.New("grpc.Recv."+methodFamily(method), method)
return trace.NewContext(ctx, tr)
})
wg.Wait()
}
var _ http.Handler = (*Server)(nil)
// serveUsingHandler is called from handleRawConn when s is configured
// to handle requests via the http.Handler interface. It sets up a
// net/http.Server to handle the just-accepted conn. The http.Server
// is configured to route all incoming requests (all HTTP/2 streams)
// to ServeHTTP, which creates a new ServerTransport for each stream.
// serveUsingHandler blocks until conn closes.
//
// This codepath is only used when Server.TestingUseHandlerImpl has
// been configured. This lets the end2end tests exercise the ServeHTTP
// method as one of the environment types.
//
// conn is the *tls.Conn that's already been authenticated.
func (s *Server) serveUsingHandler(conn net.Conn) {
if !s.addConn(conn) {
conn.Close()
return
}
defer s.removeConn(conn)
h2s := &http2.Server{
MaxConcurrentStreams: s.opts.maxConcurrentStreams,
}
h2s.ServeConn(conn, &http2.ServeConnOpts{
Handler: s,
})
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
st, err := transport.NewServerHandlerTransport(w, r)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if !s.addConn(st) {
st.Close()
return
}
defer s.removeConn(st)
s.serveStreams(st)
}
// traceInfo returns a traceInfo and associates it with stream, if tracing is enabled.
// If tracing is not enabled, it returns nil.
func (s *Server) traceInfo(st transport.ServerTransport, stream *transport.Stream) (trInfo *traceInfo) {
tr, ok := trace.FromContext(stream.Context())
if !ok {
return nil
}
trInfo = &traceInfo{
tr: tr,
}
trInfo.firstLine.client = false
trInfo.firstLine.remoteAddr = st.RemoteAddr()
if dl, ok := stream.Context().Deadline(); ok {
trInfo.firstLine.deadline = dl.Sub(time.Now())
}
return trInfo
}
func (s *Server) addConn(c io.Closer) bool {
s.mu.Lock()
defer s.mu.Unlock()
if s.conns == nil || s.drain {
return false
}
s.conns[c] = true
return true
}
func (s *Server) removeConn(c io.Closer) {
s.mu.Lock()
defer s.mu.Unlock()
if s.conns != nil {
delete(s.conns, c)
s.cv.Broadcast()
}
}
func (s *Server) sendResponse(t transport.ServerTransport, stream *transport.Stream, msg interface{}, cp Compressor, opts *transport.Options) error {
var (
cbuf *bytes.Buffer
outPayload *stats.OutPayload
)
if cp != nil {
cbuf = new(bytes.Buffer)
}
if s.opts.statsHandler != nil {
outPayload = &stats.OutPayload{}
}
p, err := encode(s.opts.codec, msg, cp, cbuf, outPayload)
if err != nil {
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grpclog.Errorln("grpc: server failed to encode response: ", err)
return err
}
if len(p) > s.opts.maxSendMessageSize {
return status.Errorf(codes.ResourceExhausted, "grpc: trying to send message larger than max (%d vs. %d)", len(p), s.opts.maxSendMessageSize)
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}
err = t.Write(stream, p, opts)
if err == nil && outPayload != nil {
outPayload.SentTime = time.Now()
s.opts.statsHandler.HandleRPC(stream.Context(), outPayload)
}
return err
}
func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, md *MethodDesc, trInfo *traceInfo) (err error) {
sh := s.opts.statsHandler
if sh != nil {
begin := &stats.Begin{
BeginTime: time.Now(),
}
sh.HandleRPC(stream.Context(), begin)
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defer func() {
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end := &stats.End{
EndTime: time.Now(),
}
if err != nil && err != io.EOF {
end.Error = toRPCErr(err)
}
sh.HandleRPC(stream.Context(), end)
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}()
}
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if trInfo != nil {
defer trInfo.tr.Finish()
trInfo.firstLine.client = false
trInfo.tr.LazyLog(&trInfo.firstLine, false)
defer func() {
if err != nil && err != io.EOF {
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
trInfo.tr.SetError()
}
}()
}
if s.opts.cp != nil {
// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
stream.SetSendCompress(s.opts.cp.Type())
}
p := &parser{r: stream}
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pf, req, err := p.recvMsg(s.opts.maxReceiveMessageSize)
if err == io.EOF {
// The entire stream is done (for unary RPC only).
return err
}
if err == io.ErrUnexpectedEOF {
err = Errorf(codes.Internal, io.ErrUnexpectedEOF.Error())
}
if err != nil {
if st, ok := status.FromError(err); ok {
if e := t.WriteStatus(stream, st); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
}
} else {
switch st := err.(type) {
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case transport.ConnectionError:
// Nothing to do here.
case transport.StreamError:
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if e := t.WriteStatus(stream, status.New(st.Code, st.Desc)); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
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}
default:
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panic(fmt.Sprintf("grpc: Unexpected error (%T) from recvMsg: %v", st, st))
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}
}
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return err
}
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if err := checkRecvPayload(pf, stream.RecvCompress(), s.opts.dc); err != nil {
if st, ok := status.FromError(err); ok {
if e := t.WriteStatus(stream, st); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
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}
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return err
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}
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if e := t.WriteStatus(stream, status.New(codes.Internal, err.Error())); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
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}
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// TODO checkRecvPayload always return RPC error. Add a return here if necessary.
}
var inPayload *stats.InPayload
if sh != nil {
inPayload = &stats.InPayload{
RecvTime: time.Now(),
}
}
df := func(v interface{}) error {
if inPayload != nil {
inPayload.WireLength = len(req)
}
if pf == compressionMade {
var err error
req, err = s.opts.dc.Do(bytes.NewReader(req))
if err != nil {
return Errorf(codes.Internal, err.Error())
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}
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}
if len(req) > s.opts.maxReceiveMessageSize {
// TODO: Revisit the error code. Currently keep it consistent with
// java implementation.
return status.Errorf(codes.ResourceExhausted, "grpc: received message larger than max (%d vs. %d)", len(req), s.opts.maxReceiveMessageSize)
}
if err := s.opts.codec.Unmarshal(req, v); err != nil {
return status.Errorf(codes.Internal, "grpc: error unmarshalling request: %v", err)
}
if inPayload != nil {
inPayload.Payload = v
inPayload.Data = req
inPayload.Length = len(req)
sh.HandleRPC(stream.Context(), inPayload)
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}
if trInfo != nil {
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trInfo.tr.LazyLog(&payload{sent: false, msg: v}, true)
}
return nil
}
reply, appErr := md.Handler(srv.server, stream.Context(), df, s.opts.unaryInt)
if appErr != nil {
appStatus, ok := status.FromError(appErr)
if !ok {
// Convert appErr if it is not a grpc status error.
appErr = status.Error(convertCode(appErr), appErr.Error())
appStatus, _ = status.FromError(appErr)
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}
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if trInfo != nil {
trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
trInfo.tr.SetError()
}
if e := t.WriteStatus(stream, appStatus); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
}
return appErr
}
if trInfo != nil {
trInfo.tr.LazyLog(stringer("OK"), false)
}
opts := &transport.Options{
Last: true,
Delay: false,
}
if err := s.sendResponse(t, stream, reply, s.opts.cp, opts); err != nil {
if err == io.EOF {
// The entire stream is done (for unary RPC only).
return err
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}
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if s, ok := status.FromError(err); ok {
if e := t.WriteStatus(stream, s); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status: %v", e)
}
} else {
switch st := err.(type) {
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case transport.ConnectionError:
// Nothing to do here.
case transport.StreamError:
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if e := t.WriteStatus(stream, status.New(st.Code, st.Desc)); e != nil {
grpclog.Warningf("grpc: Server.processUnaryRPC failed to write status %v", e)
}
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default:
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panic(fmt.Sprintf("grpc: Unexpected error (%T) from sendResponse: %v", st, st))
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}
}
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return err
}
if trInfo != nil {
trInfo.tr.LazyLog(&payload{sent: true, msg: reply}, true)
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}
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// TODO: Should we be logging if writing status failed here, like above?
// Should the logging be in WriteStatus? Should we ignore the WriteStatus
// error or allow the stats handler to see it?
return t.WriteStatus(stream, status.New(codes.OK, ""))
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}
func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transport.Stream, srv *service, sd *StreamDesc, trInfo *traceInfo) (err error) {
sh := s.opts.statsHandler
if sh != nil {
begin := &stats.Begin{
BeginTime: time.Now(),
}
sh.HandleRPC(stream.Context(), begin)
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defer func() {
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end := &stats.End{
EndTime: time.Now(),
}
if err != nil && err != io.EOF {
end.Error = toRPCErr(err)
}
sh.HandleRPC(stream.Context(), end)
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}()
}
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if s.opts.cp != nil {
stream.SetSendCompress(s.opts.cp.Type())
}
ss := &serverStream{
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t: t,
s: stream,
p: &parser{r: stream},
codec: s.opts.codec,
cp: s.opts.cp,
dc: s.opts.dc,
maxReceiveMessageSize: s.opts.maxReceiveMessageSize,
maxSendMessageSize: s.opts.maxSendMessageSize,
trInfo: trInfo,
statsHandler: sh,
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}
if ss.cp != nil {
ss.cbuf = new(bytes.Buffer)
}
if trInfo != nil {
trInfo.tr.LazyLog(&trInfo.firstLine, false)
defer func() {
ss.mu.Lock()
if err != nil && err != io.EOF {
ss.trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
ss.trInfo.tr.SetError()
}
ss.trInfo.tr.Finish()
ss.trInfo.tr = nil
ss.mu.Unlock()
}()
}
var appErr error
var server interface{}
if srv != nil {
server = srv.server
}
if s.opts.streamInt == nil {
appErr = sd.Handler(server, ss)
} else {
info := &StreamServerInfo{
FullMethod: stream.Method(),
IsClientStream: sd.ClientStreams,
IsServerStream: sd.ServerStreams,
}
appErr = s.opts.streamInt(server, ss, info, sd.Handler)
}
if appErr != nil {
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appStatus, ok := status.FromError(appErr)
if !ok {
switch err := appErr.(type) {
case transport.StreamError:
appStatus = status.New(err.Code, err.Desc)
default:
appStatus = status.New(convertCode(appErr), appErr.Error())
}
appErr = appStatus.Err()
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}
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if trInfo != nil {
ss.mu.Lock()
ss.trInfo.tr.LazyLog(stringer(appStatus.Message()), true)
ss.trInfo.tr.SetError()
ss.mu.Unlock()
}
t.WriteStatus(ss.s, appStatus)
// TODO: Should we log an error from WriteStatus here and below?
return appErr
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}
if trInfo != nil {
ss.mu.Lock()
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ss.trInfo.tr.LazyLog(stringer("OK"), false)
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ss.mu.Unlock()
}
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return t.WriteStatus(ss.s, status.New(codes.OK, ""))
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}
func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream, trInfo *traceInfo) {
sm := stream.Method()
if sm != "" && sm[0] == '/' {
sm = sm[1:]
}
pos := strings.LastIndex(sm, "/")
if pos == -1 {
if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"Malformed method name %q", []interface{}{sm}}, true)
trInfo.tr.SetError()
}
errDesc := fmt.Sprintf("malformed method name: %q", stream.Method())
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if err := t.WriteStatus(stream, status.New(codes.ResourceExhausted, errDesc)); err != nil {
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if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
trInfo.tr.SetError()
}
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grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
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}
if trInfo != nil {
trInfo.tr.Finish()
}
return
}
service := sm[:pos]
method := sm[pos+1:]
srv, ok := s.m[service]
if !ok {
if unknownDesc := s.opts.unknownStreamDesc; unknownDesc != nil {
s.processStreamingRPC(t, stream, nil, unknownDesc, trInfo)
return
}
if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"Unknown service %v", []interface{}{service}}, true)
trInfo.tr.SetError()
}
errDesc := fmt.Sprintf("unknown service %v", service)
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if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
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if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
trInfo.tr.SetError()
}
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grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
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}
if trInfo != nil {
trInfo.tr.Finish()
}
return
}
// Unary RPC or Streaming RPC?
if md, ok := srv.md[method]; ok {
s.processUnaryRPC(t, stream, srv, md, trInfo)
return
}
if sd, ok := srv.sd[method]; ok {
s.processStreamingRPC(t, stream, srv, sd, trInfo)
return
}
if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"Unknown method %v", []interface{}{method}}, true)
trInfo.tr.SetError()
}
if unknownDesc := s.opts.unknownStreamDesc; unknownDesc != nil {
s.processStreamingRPC(t, stream, nil, unknownDesc, trInfo)
return
}
errDesc := fmt.Sprintf("unknown method %v", method)
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if err := t.WriteStatus(stream, status.New(codes.Unimplemented, errDesc)); err != nil {
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if trInfo != nil {
trInfo.tr.LazyLog(&fmtStringer{"%v", []interface{}{err}}, true)
trInfo.tr.SetError()
}
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grpclog.Warningf("grpc: Server.handleStream failed to write status: %v", err)
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}
if trInfo != nil {
trInfo.tr.Finish()
}
}
// Stop stops the gRPC server. It immediately closes all open
// connections and listeners.
// It cancels all active RPCs on the server side and the corresponding
// pending RPCs on the client side will get notified by connection
// errors.
func (s *Server) Stop() {
s.mu.Lock()
listeners := s.lis
s.lis = nil
st := s.conns
s.conns = nil
// interrupt GracefulStop if Stop and GracefulStop are called concurrently.
s.cv.Broadcast()
s.mu.Unlock()
for lis := range listeners {
lis.Close()
}
for c := range st {
c.Close()
}
s.mu.Lock()
s.cancel()
if s.events != nil {
s.events.Finish()
s.events = nil
}
s.mu.Unlock()
}
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// GracefulStop stops the gRPC server gracefully. It stops the server from
// accepting new connections and RPCs and blocks until all the pending RPCs are
// finished.
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func (s *Server) GracefulStop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.conns == nil {
return
}
for lis := range s.lis {
lis.Close()
}
s.lis = nil
s.cancel()
if !s.drain {
for c := range s.conns {
c.(transport.ServerTransport).Drain()
}
s.drain = true
}
for len(s.conns) != 0 {
s.cv.Wait()
}
s.conns = nil
if s.events != nil {
s.events.Finish()
s.events = nil
}
}
func init() {
internal.TestingCloseConns = func(arg interface{}) {
arg.(*Server).testingCloseConns()
}
internal.TestingUseHandlerImpl = func(arg interface{}) {
arg.(*Server).opts.useHandlerImpl = true
}
}
// testingCloseConns closes all existing transports but keeps s.lis
// accepting new connections.
func (s *Server) testingCloseConns() {
s.mu.Lock()
for c := range s.conns {
c.Close()
delete(s.conns, c)
}
s.mu.Unlock()
}
// SetHeader sets the header metadata.
// When called multiple times, all the provided metadata will be merged.
// All the metadata will be sent out when one of the following happens:
// - grpc.SendHeader() is called;
// - The first response is sent out;
// - An RPC status is sent out (error or success).
func SetHeader(ctx context.Context, md metadata.MD) error {
if md.Len() == 0 {
return nil
}
stream, ok := transport.StreamFromContext(ctx)
if !ok {
return Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
return stream.SetHeader(md)
}
// SendHeader sends header metadata. It may be called at most once.
// The provided md and headers set by SetHeader() will be sent.
func SendHeader(ctx context.Context, md metadata.MD) error {
stream, ok := transport.StreamFromContext(ctx)
if !ok {
return Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
t := stream.ServerTransport()
if t == nil {
grpclog.Fatalf("grpc: SendHeader: %v has no ServerTransport to send header metadata.", stream)
}
if err := t.WriteHeader(stream, md); err != nil {
return toRPCErr(err)
}
return nil
}
// SetTrailer sets the trailer metadata that will be sent when an RPC returns.
// When called more than once, all the provided metadata will be merged.
func SetTrailer(ctx context.Context, md metadata.MD) error {
if md.Len() == 0 {
return nil
}
stream, ok := transport.StreamFromContext(ctx)
if !ok {
return Errorf(codes.Internal, "grpc: failed to fetch the stream from the context %v", ctx)
}
return stream.SetTrailer(md)
}