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bridge.go
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bridge.go
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package gnonative
import (
"context"
"fmt"
"net"
"net/http"
"sync"
"time"
"github.com/gnolang/gno/tm2/pkg/errors"
"github.com/oklog/run"
"github.com/peterbourgon/unixtransport"
"go.uber.org/multierr"
api_gen "github.com/gnolang/gnonative/api/gen/go"
"github.com/gnolang/gnonative/api/gen/go/_goconnect"
"github.com/gnolang/gnonative/service"
)
type BridgeConfig struct {
RootDir string
TmpDir string
UseTcpListener bool
DisableUdsListener bool
}
func NewBridgeConfig() *BridgeConfig {
return &BridgeConfig{}
}
type Bridge struct {
errc chan error
closec chan struct{}
onceCloser sync.Once
workers run.Group
serviceServer service.GnoNativeService
ServiceClient
}
func NewBridge(config *BridgeConfig) (*Bridge, error) {
svcOpts := []service.GnoNativeOption{}
// create bridge instance
b := &Bridge{
errc: make(chan error),
closec: make(chan struct{}),
}
// create cancel service
{
b.workers.Add(func() error {
// wait for closing signal
<-b.closec
return api_gen.ErrCode_ErrBridgeInterrupted
}, func(error) {
b.onceCloser.Do(func() { close(b.closec) })
})
}
// start gRPC service
{
svcOpts = append(svcOpts,
service.WithRootDir(config.RootDir),
service.WithTmpDir(config.TmpDir),
)
if config.UseTcpListener {
svcOpts = append(svcOpts, service.WithUseTcpListener())
}
if config.DisableUdsListener {
svcOpts = append(svcOpts, service.WithDisableUdsListener())
}
serviceServer, err := service.NewGnoNativeService(svcOpts...)
if err != nil {
return nil, errors.Wrap(err, "unable to create bridge service")
}
b.serviceServer = serviceServer
}
// create native bridge client
{
var httpClient *http.Client
var address string
// prefer a TCP connection if available
// because iOS simulator devices cannot use UDS connections
if config.UseTcpListener {
httpClient = http.DefaultClient
port := b.serviceServer.GetTcpPort()
address = fmt.Sprintf("http://localhost:%d", port)
} else {
path := b.serviceServer.GetUDSPath()
address = fmt.Sprintf("http+unix://%s:", path)
t := &http.Transport{
Dial: func(network, addr string) (net.Conn, error) {
conn, err := net.DialTimeout(network, addr, time.Second*2)
if err != nil {
return nil, err
}
conn.SetDeadline(time.Now().Add(time.Second * 2))
return conn, nil
},
}
unixtransport.Register(t)
httpClient = &http.Client{Transport: t}
}
client := _goconnect.NewGnoNativeServiceClient(
httpClient,
address,
)
b.ServiceClient = NewServiceClient(client)
}
// start Bridge
go func() {
b.errc <- b.workers.Run()
}()
return b, nil
}
func (b *Bridge) GetUDSPath() string {
if b.serviceServer == nil {
return ""
}
return b.serviceServer.GetUDSPath()
}
func (b *Bridge) GetTcpPort() int {
if b.serviceServer == nil {
return 0
}
return b.serviceServer.GetTcpPort()
}
func (b *Bridge) GetTcpAddr() string {
if b.serviceServer == nil {
return ""
}
return b.serviceServer.GetTcpAddr()
}
func (b *Bridge) Close() error {
var errs error
// close gRPC bridge
if !b.isClosed() {
// send close signal
b.onceCloser.Do(func() { close(b.closec) })
// set close timeout
ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
// wait or die
var err error
select {
case err = <-b.errc:
case <-ctx.Done():
err = ctx.Err()
}
b.serviceServer.Close()
if !api_gen.Is(err, api_gen.ErrCode_ErrBridgeInterrupted) {
errs = multierr.Append(errs, err)
}
cancel()
}
return errs
}
func (b *Bridge) isClosed() bool {
select {
case <-b.closec:
return true
default:
return false
}
}