/
bridge.go
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/
bridge.go
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package bertybridge
import (
"context"
"fmt"
"strings"
"sync"
"time"
ma "github.com/multiformats/go-multiaddr"
"github.com/oklog/run"
"github.com/pkg/errors"
"go.uber.org/zap"
"google.golang.org/grpc"
"berty.tech/berty/v2/go/framework/bertybridge/internal/bridgepb"
"berty.tech/berty/v2/go/internal/grpcutil"
"berty.tech/berty/v2/go/internal/ipfsutil"
"berty.tech/berty/v2/go/pkg/errcode"
)
const ClientBufferSize = 256 * 1024
type PromiseBlock interface {
CallResolve(reply string)
CallReject(error error)
}
type Config struct {
bridgeGrpcAddrs []string
}
func NewConfig() *Config {
return &Config{
bridgeGrpcAddrs: make([]string, 0),
}
}
// AddGRPCListener create a grpc listener with the given multiaddr
// if a normal addr is given, it will listen by default on grpcweb
// (ex: ":0" -> "/ip4/127.0.0.1/tcp/0/grpcweb")
func (c *Config) AddGRPCListener(addr string) {
c.bridgeGrpcAddrs = append(c.bridgeGrpcAddrs, addr)
}
type Bridge struct {
cerr chan error
cclose chan struct{}
once sync.Once
workers run.Group
grpcServer *grpc.Server
logger *zap.Logger
clientBridgeService *Client
bufListener *grpcutil.BufListener
listeners []grpcutil.Listener
}
// newBridge is the main entrypoint for gomobile and should only take simple configuration as argument
func newBridge(ctx context.Context, s *grpc.Server, logger *zap.Logger, config *Config) (*Bridge, error) {
if config == nil {
config = NewConfig()
}
b := &Bridge{
cerr: make(chan error),
cclose: make(chan struct{}),
// noop opt
grpcServer: s,
logger: logger,
}
// Create cancel service
b.workers.Add(func() error {
// wait for closing signal
<-b.cclose
return errcode.ErrBridgeInterrupted
}, func(error) {
b.once.Do(func() {
close(b.cclose)
})
})
// setup grpc listeners
{
var err error
for _, addr := range config.bridgeGrpcAddrs {
if addr == "" {
err = fmt.Errorf("addr can't be empty")
} else {
err = b.addGRPCListenner(addr)
}
if err != nil {
return nil, errors.Wrap(err, "init gRPC listener failed")
}
}
}
// setup lazy grpc listener
bl := grpcutil.NewBufListener(ctx, ClientBufferSize)
b.workers.Add(func() error {
return b.grpcServer.Serve(bl)
}, func(error) {
bl.Close()
})
// setup lazy grpc listener for services
var ccServices *grpc.ClientConn
var bufListener *grpcutil.BufListener
{
var err error
bufListener = grpcutil.NewBufListener(ctx, ClientBufferSize)
b.workers.Add(func() error {
return b.grpcServer.Serve(bufListener)
}, func(error) {
bufListener.Close()
})
if ccServices, err = bufListener.NewClientConn(); err != nil {
return nil, errors.Wrap(err, "unable to get services gRPC ClientConn")
}
}
b.bufListener = bufListener
// setup bridge client
var ccBridge *grpc.ClientConn
{
var err error
service := NewServiceFromClientConn(ccServices)
s := grpc.NewServer()
bridgepb.RegisterBridgeServiceServer(s, service)
bl := grpcutil.NewBufListener(ctx, ClientBufferSize)
b.workers.Add(func() error {
return s.Serve(bl)
}, func(error) {
bl.Close()
service.Close()
})
if ccBridge, err = bl.NewClientConn(); err != nil {
return nil, errors.Wrap(err, "unable to get bridge gRPC ClientConn")
}
}
b.clientBridgeService = &Client{ccBridge}
// start Bridge
b.logger.Debug("starting Bridge")
go func() {
b.cerr <- b.workers.Run()
}()
return b, nil
}
func (b *Bridge) InvokeBridgeMethodWithPromiseBlock(promise PromiseBlock, method string, b64message string) {
go func() {
res, err := b.InvokeBridgeMethod(method, b64message)
// if an internal error occure generate a new bridge error
if err != nil {
err = errors.Wrap(err, "unable to invoke bridge method")
promise.CallReject(err)
return
}
promise.CallResolve(res)
}()
}
func (b *Bridge) InvokeBridgeMethod(method string, b64message string) (string, error) {
return b.clientBridgeService.UnaryRequestFromBase64(method, b64message)
}
func (b *Bridge) GRPCListenerAddr() string { return b.GetGRPCAddrFor("ip4/tcp/grpc") }
func (b *Bridge) GRPCWebListenerAddr() string { return b.GetGRPCAddrFor("ip4/tcp/grpcweb") }
func (b *Bridge) GRPCWebSocketListenerAddr() string { return b.GetGRPCAddrFor("ip4/tcp/grpcws") }
// GetGRPCAddrFor the given protocols, if not found return an empty string
func (b *Bridge) GetGRPCAddrFor(protos string) string {
for _, l := range b.listeners {
ps := make([]string, 0)
ma.ForEach(l.GRPCMultiaddr(), func(c ma.Component) bool {
ps = append(ps, c.Protocol().Name)
return true
})
if strings.Join(ps, "/") == protos {
return l.Addr().String()
}
}
return ""
}
// NewGRPCClient return client service on success
func (b *Bridge) NewGRPCClient() (client *Client, cleanup func(), err error) {
var grpcClient *grpc.ClientConn
if grpcClient, err = b.bufListener.NewClientConn(); err != nil {
return
}
client = &Client{grpcClient}
cleanup = func() {
_ = client.Close()
}
return
}
// Close Bridge
func (b *Bridge) Close() (err error) {
if b.isClosed() {
return errcode.ErrBridgeNotRunning
}
b.logger.Info("Bridge.Close called")
// send close signal
b.once.Do(func() { close(b.cclose) })
// set close timeout
ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
defer cancel()
// wait or die
select {
case err = <-b.cerr:
case <-ctx.Done():
err = ctx.Err()
}
b.grpcServer.Stop()
b.bufListener.Close()
if !errcode.Is(err, errcode.ErrBridgeInterrupted) {
return errcode.TODO.Wrap(err)
}
return nil
}
func (b *Bridge) isClosed() bool {
select {
case <-b.cclose:
return true
default:
return false
}
}
func (b *Bridge) addGRPCListenner(maddr string) error {
m, err := ipfsutil.ParseAddr(maddr)
if err != nil {
return err
}
b.logger.Info("add gRPC listener", zap.Stringer("addr", m))
l, err := grpcutil.Listen(m)
if err != nil {
return err
}
server := &grpcutil.Server{GRPCServer: b.grpcServer}
b.workers.Add(func() (err error) {
if err = server.Serve(l); err != nil {
b.logger.Error("grpc serve server",
zap.String("maddr", maddr),
zap.Error(err))
}
return
}, func(err error) {
l.Close()
})
b.listeners = append(b.listeners, l)
return nil
}