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client.go
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client.go
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package rsocket
import (
"context"
"crypto/tls"
"time"
"github.com/google/uuid"
"github.com/rsocket/rsocket-go/internal/common"
"github.com/rsocket/rsocket-go/internal/fragmentation"
"github.com/rsocket/rsocket-go/internal/socket"
"github.com/rsocket/rsocket-go/internal/transport"
"github.com/rsocket/rsocket-go/payload"
)
var defaultMimeType = []byte("application/binary")
type (
// ClientResumeOptions represents resume options for client.
ClientResumeOptions func(opts *resumeOpts)
// Client is Client Side of a RSocket socket. Sends Frames to a RSocket Server.
Client interface {
CloseableRSocket
}
setupClientSocket interface {
Client
Setup(ctx context.Context, setup *socket.SetupInfo) error
}
// ClientSocketAcceptor is alias for RSocket handler function.
ClientSocketAcceptor = func(socket RSocket) RSocket
// ClientStarter can be used to start a client.
ClientStarter interface {
// Start start a client socket.
Start(ctx context.Context) (Client, error)
// Start start a client socket with TLS.
// Here's an example:
// tc:=&tls.Config{
// InsecureSkipVerify: true,
//}
StartTLS(ctx context.Context, tc *tls.Config) (Client, error)
}
// ClientBuilder can be used to build a RSocket client.
ClientBuilder interface {
ClientTransportBuilder
// Fragment set fragmentation size which default is 16_777_215(16MB).
Fragment(mtu int) ClientBuilder
// KeepAlive defines current client keepalive settings.
KeepAlive(tickPeriod, ackTimeout time.Duration, missedAcks int) ClientBuilder
// Resume enable resume for current RSocket.
Resume(opts ...ClientResumeOptions) ClientBuilder
// DataMimeType is used to set payload data MIME type.
// Default MIME type is `application/binary`.
DataMimeType(mime string) ClientBuilder
// MetadataMimeType is used to set payload metadata MIME type.
// Default MIME type is `application/binary`.
MetadataMimeType(mime string) ClientBuilder
// SetupPayload set the setup payload.
SetupPayload(setup payload.Payload) ClientBuilder
// OnClose register handler when client socket closed.
OnClose(fn func()) ClientBuilder
// Acceptor set acceptor for RSocket client.
Acceptor(acceptor ClientSocketAcceptor) ClientTransportBuilder
}
// ClientTransportBuilder is used to build a RSocket client with custom Transport string.
ClientTransportBuilder interface {
// Transport set Transport for current RSocket client.
// URI is used to create RSocket Transport:
// Example:
// "tcp://127.0.0.1:7878" means a TCP RSocket transport.
// "ws://127.0.0.1:8080/a/b/c" means a Websocket RSocket transport.
// "wss://127.0.0.1:8080/a/b/c" means a Websocket RSocket transport with HTTPS.
Transport(uri string) ClientStarter
}
)
// Connect create a new RSocket client builder with default settings.
func Connect() ClientBuilder {
return &implClientBuilder{
fragment: fragmentation.MaxFragment,
setup: &socket.SetupInfo{
Version: common.DefaultVersion,
KeepaliveInterval: common.DefaultKeepaliveInteval,
KeepaliveLifetime: common.DefaultKeepaliveMaxLifetime,
DataMimeType: defaultMimeType,
MetadataMimeType: defaultMimeType,
},
}
}
type implClientBuilder struct {
resume *resumeOpts
fragment int
addr string
setup *socket.SetupInfo
acceptor ClientSocketAcceptor
onCloses []func()
}
func (p *implClientBuilder) Resume(opts ...ClientResumeOptions) ClientBuilder {
if p.resume == nil {
p.resume = newResumeOpts()
}
for _, it := range opts {
it(p.resume)
}
return p
}
func (p *implClientBuilder) Fragment(mtu int) ClientBuilder {
p.fragment = mtu
return p
}
func (p *implClientBuilder) OnClose(fn func()) ClientBuilder {
p.onCloses = append(p.onCloses, fn)
return p
}
func (p *implClientBuilder) KeepAlive(tickPeriod, ackTimeout time.Duration, missedAcks int) ClientBuilder {
p.setup.KeepaliveInterval = tickPeriod
p.setup.KeepaliveLifetime = time.Duration(missedAcks) * ackTimeout
return p
}
func (p *implClientBuilder) DataMimeType(mime string) ClientBuilder {
p.setup.DataMimeType = []byte(mime)
return p
}
func (p *implClientBuilder) MetadataMimeType(mime string) ClientBuilder {
p.setup.MetadataMimeType = []byte(mime)
return p
}
func (p *implClientBuilder) SetupPayload(setup payload.Payload) ClientBuilder {
p.setup.Data = nil
p.setup.Metadata = nil
if data := setup.Data(); len(data) > 0 {
p.setup.Data = make([]byte, len(data))
copy(p.setup.Data, data)
}
if metadata, ok := setup.Metadata(); ok {
p.setup.Metadata = make([]byte, len(metadata))
copy(p.setup.Metadata, metadata)
}
return p
}
func (p *implClientBuilder) Acceptor(acceptor ClientSocketAcceptor) ClientTransportBuilder {
p.acceptor = acceptor
return p
}
func (p *implClientBuilder) Transport(transport string) ClientStarter {
p.addr = transport
return p
}
func (p *implClientBuilder) StartTLS(ctx context.Context, tc *tls.Config) (Client, error) {
return p.start(ctx, tc)
}
func (p *implClientBuilder) Start(ctx context.Context) (client Client, err error) {
return p.start(ctx, nil)
}
func (p *implClientBuilder) start(ctx context.Context, tc *tls.Config) (client Client, err error) {
var uri *transport.URI
uri, err = transport.ParseURI(p.addr)
if err != nil {
return
}
// create a blank socket.
err = fragmentation.IsValidFragment(p.fragment)
if err != nil {
return nil, err
}
sk := socket.NewClientDuplexRSocket(
p.fragment,
p.setup.KeepaliveInterval,
)
// create a client.
var cs setupClientSocket
if p.resume != nil {
p.setup.Token = p.resume.tokenGen()
cs = socket.NewClientResume(uri, sk, tc)
} else {
cs = socket.NewClient(uri, sk, tc)
}
if p.acceptor != nil {
sk.SetResponder(p.acceptor(cs))
}
// bind closers.
if len(p.onCloses) > 0 {
for _, closer := range p.onCloses {
cs.OnClose(closer)
}
}
// setup client.
err = cs.Setup(ctx, p.setup)
if err == nil {
client = cs
}
return
}
type resumeOpts struct {
tokenGen func() []byte
}
func newResumeOpts() *resumeOpts {
return &resumeOpts{
tokenGen: getPresetResumeTokenGen,
}
}
func getPresetResumeTokenGen() (token []byte) {
token, _ = uuid.New().MarshalBinary()
return
}
// WithClientResumeToken creates a resume token generator.
func WithClientResumeToken(gen func() []byte) ClientResumeOptions {
return func(opts *resumeOpts) {
opts.tokenGen = gen
}
}