added sentinel direct (#1077)

direct/sentinel_client.go

@@ -0,0 +1,103 @@
+/*
+   Copyright 2021 Erigon contributors
+
+   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 direct
+
+import (
+	"context"
+	"io"
+
+	"github.com/ledgerwatch/erigon-lib/gointerfaces/sentinel"
+	"google.golang.org/grpc"
+)
+
+type SentinelClientDirect struct {
+	server sentinel.SentinelServer
+}
+
+func NewSentinelClientDirect(sentinel sentinel.SentinelServer) sentinel.SentinelClient {
+	return &SentinelClientDirect{server: sentinel}
+}
+
+func (s *SentinelClientDirect) SendRequest(ctx context.Context, in *sentinel.RequestData, opts ...grpc.CallOption) (*sentinel.ResponseData, error) {
+	return s.server.SendRequest(ctx, in)
+}
+
+func (s *SentinelClientDirect) SetStatus(ctx context.Context, in *sentinel.Status, opts ...grpc.CallOption) (*sentinel.EmptyMessage, error) {
+	return s.server.SetStatus(ctx, in)
+}
+
+func (s *SentinelClientDirect) GetPeers(ctx context.Context, in *sentinel.EmptyMessage, opts ...grpc.CallOption) (*sentinel.PeerCount, error) {
+	return s.server.GetPeers(ctx, in)
+}
+
+func (s *SentinelClientDirect) BanPeer(ctx context.Context, p *sentinel.Peer, opts ...grpc.CallOption) (*sentinel.EmptyMessage, error) {
+	return s.server.BanPeer(ctx, p)
+}
+
+func (s *SentinelClientDirect) PublishGossip(ctx context.Context, in *sentinel.GossipData, opts ...grpc.CallOption) (*sentinel.EmptyMessage, error) {
+	return s.server.PublishGossip(ctx, in)
+}
+
+// Subscribe gossip part. the only complex section of this bullshit
+
+func (s *SentinelClientDirect) SubscribeGossip(ctx context.Context, in *sentinel.EmptyMessage, opts ...grpc.CallOption) (sentinel.Sentinel_SubscribeGossipClient, error) {
+	ch := make(chan *gossipReply, 16384)
+	streamServer := &SentinelSubscribeGossipS{ch: ch, ctx: ctx}
+	go func() {
+		defer close(ch)
+		streamServer.Err(s.server.SubscribeGossip(in, streamServer))
+	}()
+	return &SentinelSubscribeGossipC{ch: ch, ctx: ctx}, nil
+}
+
+type SentinelSubscribeGossipC struct {
+	ch  chan *gossipReply
+	ctx context.Context
+	grpc.ClientStream
+}
+
+func (c *SentinelSubscribeGossipC) Recv() (*sentinel.GossipData, error) {
+	m, ok := <-c.ch
+	if !ok || m == nil {
+		return nil, io.EOF
+	}
+	return m.r, m.err
+}
+func (c *SentinelSubscribeGossipC) Context() context.Context { return c.ctx }
+
+type SentinelSubscribeGossipS struct {
+	ch  chan *gossipReply
+	ctx context.Context
+	grpc.ServerStream
+}
+
+type gossipReply struct {
+	r   *sentinel.GossipData
+	err error
+}
+
+func (s *SentinelSubscribeGossipS) Send(m *sentinel.GossipData) error {
+	s.ch <- &gossipReply{r: m}
+	return nil
+}
+func (s *SentinelSubscribeGossipS) Context() context.Context { return s.ctx }
+func (s *SentinelSubscribeGossipS) Err(err error) {
+	if err == nil {
+		return
+	}
+	s.ch <- &gossipReply{err: err}
+}