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raftapi.go
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raftapi.go
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package foobar
import (
"context"
"io"
"sync"
"github.com/hashicorp/raft"
bs "github.com/vaci/raft-capnp-transport/bs"
)
// These are calls from the Raft engine that we need to send out over gRPC.
type RaftTransportServer struct{}
func (RaftTransportServer) RequestVote(ctx context.Context, call RaftTransport_requestVote) error {
return nil
}
type raftAPI struct {
manager *Manager
}
type conn struct {
//clientConn *grpc.ClientConn
client RaftTransport
mtx sync.Mutex
}
func decodeRPCHeader(m *RaftTransport_RpcHeader) raft.RPCHeader {
reply := raft.RPCHeader{
ProtocolVersion: raft.ProtocolVersion(m.Version()),
}
{
value, err := m.Id()
if err != nil {
reply.ID = value
}
}
{
value, err := m.Addr()
if err != nil {
reply.Addr = value
}
}
return reply
}
// Consumer returns a channel that can be used to consume and respond to RPC requests.
func (r raftAPI) Consumer() <-chan raft.RPC {
return r.manager.rpcChan
}
// LocalAddr is used to return our local address to distinguish from our peers.
func (r raftAPI) LocalAddr() raft.ServerAddress {
return r.manager.localAddress
}
func (r raftAPI) getPeer(id raft.ServerID, target raft.ServerAddress) (RaftTransport, error) {
r.manager.connectionsMtx.Lock()
c, ok := r.manager.connections[id]
if !ok {
c = &conn{}
c.mtx.Lock()
r.manager.connections[id] = c
}
r.manager.connectionsMtx.Unlock()
if ok {
c.mtx.Lock()
}
defer c.mtx.Unlock()
//if c.clientConn == nil {
//conn, err := rpc.NewConn(rpc.NewStreamTransport(rwc), nil)
// if err != nil {
// return nil, err
// }
// c.clientConn = conn
// c.client = pb.NewRaftTransportClient(conn)
//}
return c.client, nil
}
func (r raftAPI) AppendEntries(id raft.ServerID, target raft.ServerAddress, args *raft.AppendEntriesRequest, resp *raft.AppendEntriesResponse) error {
c, err := r.getPeer(id, target)
if err != nil {
return err
}
method, releaseMethod := c.AppendEntries(context.TODO(), func(params RaftTransport_appendEntries_Params) error {
params.SetTerm(args.Term)
return nil
})
defer releaseMethod()
reply, err := method.Struct()
if err != nil {
return err
}
header, err := reply.Header()
if err != nil {
return err
}
*resp = raft.AppendEntriesResponse{
RPCHeader: decodeRPCHeader(&header),
Term: reply.Term(),
}
return nil
}
// RequestVote sends the appropriate RPC to the target node.
func (r raftAPI) RequestVote(id raft.ServerID, target raft.ServerAddress, args *raft.RequestVoteRequest, resp *raft.RequestVoteResponse) error {
c, err := r.getPeer(id, target)
if err != nil {
return err
}
method, releaseMethod := c.RequestVote(context.TODO(), func(params RaftTransport_requestVote_Params) error {
params.SetTerm(args.Term)
params.SetCandidate(args.Candidate)
params.SetLastLogIndex(args.LastLogIndex)
params.SetLastLogTerm(args.LastLogTerm)
params.SetLeadershipTransfer(args.LeadershipTransfer)
return nil
})
defer releaseMethod()
reply, err := method.Struct()
if err != nil {
return err
}
header, err := reply.Header()
if err != nil {
return err
}
*resp = raft.RequestVoteResponse{
RPCHeader: decodeRPCHeader(&header),
Term: reply.Term(),
//Peers: reply.Peers(),
Granted: reply.Granted(),
}
return nil
}
// TimeoutNow is used to start a leadership transfer to the target node.
func (r raftAPI) TimeoutNow(id raft.ServerID, target raft.ServerAddress, args *raft.TimeoutNowRequest, resp *raft.TimeoutNowResponse) error {
c, err := r.getPeer(id, target)
if err != nil {
return err
}
method, releaseMethod := c.TimeoutNow(context.TODO(), func(params RaftTransport_timeoutNow_Params) error {
return nil
})
defer releaseMethod()
reply, err := method.Struct()
if err != nil {
return err
}
header, err := reply.Header()
if err != nil {
return err
}
*resp = raft.TimeoutNowResponse{
RPCHeader: decodeRPCHeader(&header),
}
return nil
}
// InstallSnapshot is used to push a snapshot down to a follower. The data is read from
// the ReadCloser and streamed to the client.
func (r raftAPI) InstallSnapshot(id raft.ServerID, target raft.ServerAddress, args *raft.InstallSnapshotRequest, resp *raft.InstallSnapshotResponse, data io.Reader) error {
c, err := r.getPeer(id, target)
if err != nil {
return err
}
method, releaseMethod := c.InstallSnapshot(context.TODO(), func(params RaftTransport_installSnapshot_Params) error {
params.SetSnapshotVersion(int64(args.SnapshotVersion))
params.SetTerm(args.Term)
params.SetLeader(args.Leader)
params.SetLastLogIndex(args.LastLogIndex)
params.SetLastLogTerm(args.LastLogTerm)
params.SetPeers(args.Peers)
params.SetConfiguration(args.Configuration)
params.SetConfigurationIndex(args.ConfigurationIndex)
return nil
})
defer releaseMethod()
stream := method.Snapshot()
var buf [16384]byte
for {
n, err := data.Read(buf[:])
if err == io.EOF || (err == nil && n == 0) {
break
}
if err != nil {
return err
}
stream.Write(context.TODO(), func(params bs.ByteStream_write_Params) error {
params.SetBytes(buf[:n])
return nil
})
if err != nil {
return err
}
}
future, releaseMethod := stream.End(context.TODO(), nil)
defer releaseMethod()
_, err = future.Struct()
if err != nil {
return err
}
if err := c.WaitStreaming(); err != nil {
return err
}
reply, err := method.Struct()
if err != nil {
return err
}
header, err := reply.Header()
*resp = raft.InstallSnapshotResponse{
RPCHeader: decodeRPCHeader(&header),
Term: reply.Term(),
Success: reply.Success(),
}
return nil
}
// EncodePeer is used to serialize a peer's address.
func (r raftAPI) EncodePeer(id raft.ServerID, addr raft.ServerAddress) []byte {
return []byte(addr)
}
// DecodePeer is used to deserialize a peer's address.
func (r raftAPI) DecodePeer(p []byte) raft.ServerAddress {
return raft.ServerAddress(p)
}
// SetHeartbeatHandler is used to setup a heartbeat handler
// as a fast-pass. This is to avoid head-of-line blocking from
// disk IO. If a Transport does not support this, it can simply
// ignore the call, and push the heartbeat onto the Consumer channel.
func (r raftAPI) SetHeartbeatHandler(cb func(rpc raft.RPC)) {
r.manager.heartbeatFuncMtx.Lock()
r.manager.heartbeatFunc = cb
r.manager.heartbeatFuncMtx.Unlock()
}