// NewConn creates a Conn.
func NewConn(cc *ClientConn) (*Conn, error) {
if cc.target == "" {
return nil, ErrUnspecTarget
}
c := &Conn{
target: cc.target,
dopts: cc.dopts,
shutdownChan: make(chan struct{}),
}
if EnableTracing {
c.events = trace.NewEventLog("grpc.ClientConn", c.target)
}
if !c.dopts.insecure {
var ok bool
for _, cd := range c.dopts.copts.AuthOptions {
if _, ok := cd.(credentials.TransportAuthenticator); !ok {
continue
}
ok = true
}
if !ok {
return nil, ErrNoTransportSecurity
}
} else {
for _, cd := range c.dopts.copts.AuthOptions {
if cd.RequireTransportSecurity() {
return nil, ErrCredentialsMisuse
}
}
}
c.stateCV = sync.NewCond(&c.mu)
if c.dopts.block {
if err := c.resetTransport(false); err != nil {
c.Close()
return nil, err
}
// Start to monitor the error status of transport.
go c.transportMonitor()
} else {
// Start a goroutine connecting to the server asynchronously.
go func() {
if err := c.resetTransport(false); err != nil {
grpclog.Printf("Failed to dial %s: %v; please retry.", c.target, err)
c.Close()
return
}
c.transportMonitor()
}()
}
return c, nil
}
// NewServer creates a gRPC server which has no service registered and has not
// started to accept requests yet.
func NewServer(opt ...ServerOption) *Server {
var opts options
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[transport.ServerTransport]bool),
m: make(map[string]*service),
}
if EnableTracing {
_, file, line, _ := runtime.Caller(1)
s.events = trace.NewEventLog("grpc.Server", fmt.Sprintf("%s:%d", file, line))
}
return s
}