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package raft
import (
"io"
"io/ioutil"
"code.google.com/p/gogoprotobuf/proto"
"github.com/coreos/raft/protobuf"
)
// The request sent to a server to append entries to the log.
type AppendEntriesRequest struct {
Term uint64
PrevLogIndex uint64
PrevLogTerm uint64
CommitIndex uint64
LeaderName string
Entries []*protobuf.LogEntry
}
// The response returned from a server appending entries to the log.
type AppendEntriesResponse struct {
pb *protobuf.AppendEntriesResponse
peer string
append bool
}
// Creates a new AppendEntries request.
func newAppendEntriesRequest(term uint64, prevLogIndex uint64, prevLogTerm uint64,
commitIndex uint64, leaderName string, entries []*LogEntry) *AppendEntriesRequest {
pbEntries := make([]*protobuf.LogEntry, len(entries))
for i := range entries {
pbEntries[i] = entries[i].pb
}
return &AppendEntriesRequest{
Term: term,
PrevLogIndex: prevLogIndex,
PrevLogTerm: prevLogTerm,
CommitIndex: commitIndex,
LeaderName: leaderName,
Entries: pbEntries,
}
}
// Encodes the AppendEntriesRequest to a buffer. Returns the number of bytes
// written and any error that may have occurred.
func (req *AppendEntriesRequest) Encode(w io.Writer) (int, error) {
pb := &protobuf.AppendEntriesRequest{
Term: proto.Uint64(req.Term),
PrevLogIndex: proto.Uint64(req.PrevLogIndex),
PrevLogTerm: proto.Uint64(req.PrevLogTerm),
CommitIndex: proto.Uint64(req.CommitIndex),
LeaderName: proto.String(req.LeaderName),
Entries: req.Entries,
}
p, err := proto.Marshal(pb)
if err != nil {
return -1, err
}
return w.Write(p)
}
// Decodes the AppendEntriesRequest from a buffer. Returns the number of bytes read and
// any error that occurs.
func (req *AppendEntriesRequest) Decode(r io.Reader) (int, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return -1, err
}
pb := new(protobuf.AppendEntriesRequest)
if err := proto.Unmarshal(data, pb); err != nil {
return -1, err
}
req.Term = pb.GetTerm()
req.PrevLogIndex = pb.GetPrevLogIndex()
req.PrevLogTerm = pb.GetPrevLogTerm()
req.CommitIndex = pb.GetCommitIndex()
req.LeaderName = pb.GetLeaderName()
req.Entries = pb.GetEntries()
return len(data), nil
}
// Creates a new AppendEntries response.
func newAppendEntriesResponse(term uint64, success bool, index uint64, commitIndex uint64) *AppendEntriesResponse {
pb := &protobuf.AppendEntriesResponse{
Term: proto.Uint64(term),
Index: proto.Uint64(index),
Success: proto.Bool(success),
CommitIndex: proto.Uint64(commitIndex),
}
return &AppendEntriesResponse{
pb: pb,
}
}
func (aer *AppendEntriesResponse) Index() uint64 {
return aer.pb.GetIndex()
}
func (aer *AppendEntriesResponse) CommitIndex() uint64 {
return aer.pb.GetCommitIndex()
}
func (aer *AppendEntriesResponse) Term() uint64 {
return aer.pb.GetTerm()
}
func (aer *AppendEntriesResponse) Success() bool {
return aer.pb.GetSuccess()
}
// Encodes the AppendEntriesResponse to a buffer. Returns the number of bytes
// written and any error that may have occurred.
func (resp *AppendEntriesResponse) Encode(w io.Writer) (int, error) {
b, err := proto.Marshal(resp.pb)
if err != nil {
return -1, err
}
return w.Write(b)
}
// Decodes the AppendEntriesResponse from a buffer. Returns the number of bytes read and
// any error that occurs.
func (resp *AppendEntriesResponse) Decode(r io.Reader) (int, error) {
data, err := ioutil.ReadAll(r)
if err != nil {
return -1, err
}
resp.pb = new(protobuf.AppendEntriesResponse)
if err := proto.Unmarshal(data, resp.pb); err != nil {
return -1, err
}
return len(data), nil
}
|
