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119 lines (98 loc) · 3.26 KB
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// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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.
package rpcserver
import (
"context"
"net"
"time"
"go.thethings.network/lorawan-stack/pkg/version"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
const inProcess = "in-process"
type inProcessAuthInfo struct{}
func (inProcessAuthInfo) AuthType() string { return inProcess }
type inProcessCredentials struct {
ServerName string
}
func (inProcessCredentials) ClientHandshake(_ context.Context, _ string, conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
return conn, inProcessAuthInfo{}, nil
}
func (inProcessCredentials) ServerHandshake(conn net.Conn) (net.Conn, credentials.AuthInfo, error) {
return conn, inProcessAuthInfo{}, nil
}
func (c inProcessCredentials) Info() credentials.ProtocolInfo {
return credentials.ProtocolInfo{
SecurityProtocol: inProcess,
SecurityVersion: version.TTN,
ServerName: c.ServerName,
}
}
func (c *inProcessCredentials) Clone() credentials.TransportCredentials { return c }
func (c *inProcessCredentials) OverrideServerName(serverName string) error {
c.ServerName = serverName
return nil
}
func newInProcessListener(parent context.Context) *inProcessListener {
ctx, cancel := context.WithCancel(parent)
return &inProcessListener{
ctx: ctx,
cancel: cancel,
ch: make(chan net.Conn),
}
}
type inProcessListener struct {
ctx context.Context
cancel context.CancelFunc
ch chan net.Conn
}
func (l inProcessListener) Accept() (net.Conn, error) {
select {
case <-l.ctx.Done():
return nil, l.ctx.Err()
case conn := <-l.ch:
return conn, nil
}
}
func (l inProcessListener) Close() error {
l.cancel()
return nil
}
type inProcessAddr string
func (inProcessAddr) Network() string { return "in-process" }
func (a inProcessAddr) String() string { return string(a) }
func (l inProcessListener) Addr() net.Addr { return inProcessAddr("in-process") }
func inProcessDialer(lis *inProcessListener) func(string, time.Duration) (net.Conn, error) {
return func(addr string, timeout time.Duration) (net.Conn, error) {
server, client := net.Pipe()
select {
case <-time.After(timeout):
return nil, context.DeadlineExceeded
case lis.ch <- server:
return client, nil
}
}
}
// StartLoopback starts the server on a local address and returns a connection to that address.
// This function does not add the default DialOptions.
func StartLoopback(ctx context.Context, s *grpc.Server, opts ...grpc.DialOption) (*grpc.ClientConn, error) {
lis := newInProcessListener(ctx)
go s.Serve(lis)
return grpc.Dial(
lis.Addr().String(),
append([]grpc.DialOption{
grpc.WithDialer(inProcessDialer(lis)),
grpc.WithTransportCredentials(&inProcessCredentials{}),
}, opts...)...)
}