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requests.go
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requests.go
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package raft
import pb "github.com/jmsadair/raft/internal/protobuf"
// AppendEntriesRequest is a request invoked by the leader to replicate log entries and also serves as a heartbeat.
type AppendEntriesRequest struct {
// The leader's ID. Allows followers to redirect clients.
LeaderID string
// The leader's Term.
Term uint64
// The leader's commit index.
LeaderCommit uint64
// The index of the log entry immediately preceding the new ones.
PrevLogIndex uint64
// The term of the log entry immediately preceding the new ones.
PrevLogTerm uint64
// Contains the log Entries to store (empty for heartbeat).
Entries []*LogEntry
}
// AppendEntriesResponse is a response to a request to to replicate log entries.
type AppendEntriesResponse struct {
// The term of the server that received the request.
Term uint64
// Indicates whether the request to append entries was successful.
Success bool
// The conflicting Index if there is one.
Index uint64
}
// RequestVoteRequest is a request invoked by candidates to gather votes.
type RequestVoteRequest struct {
// The ID of the candidate requesting the vote.
CandidateID string
// The candidate's term.
Term uint64
// The index of the candidate's last log entry.
LastLogIndex uint64
// The term of the candidate's last log entry.
LastLogTerm uint64
// Indicates whether this request is for a prevote.
Prevote bool
}
// RequestVoteResponse is a response to a request for a vote.
type RequestVoteResponse struct {
// The term of the server that received the request.
Term uint64
// Indicates whether the vote request was successful.
VoteGranted bool
}
// InstallSnapshotRequest is invoked by the leader to send a snapshot to a follower.
type InstallSnapshotRequest struct {
// The leader's ID.
LeaderID string
// The leader's Term.
Term uint64
// The snapshot replaces all entries up to and including
// this index.
LastIncludedIndex uint64
// The term associated with the last included index.
LastIncludedTerm uint64
// The last configuration included in the snapshot.
Configuration []byte
// A chunk of the snapshot.
Bytes []byte
// The offset in the snapshot file.
Offset int64
// Indicates whether this is the last chunk of the snapshot.
Done bool
}
// InstallSnapshotResponse is a response to a snapshot installation.
type InstallSnapshotResponse struct {
// The term of the server that received the request.
Term uint64
// The number of bytes written by the reciever. If the
// request is successful, this should be the number of bytes
// in the request.
BytesWritten int64
}
// makeProtoEntries converts an array of LogEntry instances to an array of protobuf LogEntry instances.
func makeProtoEntries(entries []*LogEntry) []*pb.LogEntry {
protoEntries := make([]*pb.LogEntry, len(entries))
for i, entry := range entries {
protoEntry := &pb.LogEntry{
Index: entry.Index,
Term: entry.Term,
Data: entry.Data,
EntryType: pb.LogEntry_LogEntryType(entry.EntryType),
}
protoEntries[i] = protoEntry
}
return protoEntries
}
// makeProtoRequestVoteRequest converts a RequestVoteRequest instance to a protobuf RequestVoteRequest instance.
func makeProtoRequestVoteRequest(request RequestVoteRequest) *pb.RequestVoteRequest {
return &pb.RequestVoteRequest{
CandidateId: request.CandidateID,
Term: request.Term,
LastLogIndex: request.LastLogIndex,
LastLogTerm: request.LastLogTerm,
Prevote: request.Prevote,
}
}
// makeRequestVoteResponse converts a protobuf RequestVoteResponse instance to a RequestVoteResponse instance.
func makeRequestVoteResponse(response *pb.RequestVoteResponse) RequestVoteResponse {
return RequestVoteResponse{
Term: response.GetTerm(),
VoteGranted: response.GetVoteGranted(),
}
}
// makeProtoAppendEntriesRequest converts an AppendEntriesRequest instance to a protobuf AppendEntriesRequest instance.
func makeProtoAppendEntriesRequest(request AppendEntriesRequest) *pb.AppendEntriesRequest {
return &pb.AppendEntriesRequest{
LeaderId: request.LeaderID,
Term: request.Term,
LeaderCommit: request.LeaderCommit,
PrevLogIndex: request.PrevLogIndex,
PrevLogTerm: request.PrevLogTerm,
Entries: makeProtoEntries(request.Entries),
}
}
// makeAppendEntriesResponse converts a protobuf AppendEntriesResponse instance to an AppendEntriesResponse instance.
func makeAppendEntriesResponse(response *pb.AppendEntriesResponse) AppendEntriesResponse {
return AppendEntriesResponse{
Success: response.GetSuccess(),
Term: response.GetTerm(),
Index: response.GetIndex(),
}
}
// makeProtoInstallSnapshotRequest converts an InstallSnapshotRequest instance to a protobuf InstallSnapshotRequest instance.
func makeProtoInstallSnapshotRequest(request InstallSnapshotRequest) *pb.InstallSnapshotRequest {
return &pb.InstallSnapshotRequest{
Leader: request.LeaderID,
Term: request.Term,
LastIncludedIndex: request.LastIncludedIndex,
LastIncludedTerm: request.LastIncludedTerm,
Configuration: request.Configuration,
Data: request.Bytes,
Offset: request.Offset,
Done: request.Done,
}
}
// makeInstallSnapshotResponse converts an protobuf InstallSnapshotResponse instance to a InstallSnapshotResponse instance.
func makeInstallSnapshotResponse(response *pb.InstallSnapshotResponse) InstallSnapshotResponse {
return InstallSnapshotResponse{
Term: response.GetTerm(),
BytesWritten: response.GetBytesWritten(),
}
}
// makeEntries converts an array of protobuf LogEntry instances to an array of LogEntry instances.
func makeEntries(protoEntries []*pb.LogEntry) []*LogEntry {
entries := make([]*LogEntry, len(protoEntries))
for i, protoEntry := range protoEntries {
entry := &LogEntry{
Index: protoEntry.GetIndex(),
Term: protoEntry.GetTerm(),
Data: protoEntry.GetData(),
EntryType: LogEntryType(protoEntry.EntryType),
}
entries[i] = entry
}
return entries
}
// makeRequestVoteRequest converts a protobuf RequestVoteRequest instance to a RequestVoteRequest instance.
func makeRequestVoteRequest(request *pb.RequestVoteRequest) RequestVoteRequest {
return RequestVoteRequest{
CandidateID: request.GetCandidateId(),
Term: request.GetTerm(),
LastLogIndex: request.GetLastLogIndex(),
LastLogTerm: request.GetLastLogTerm(),
Prevote: request.GetPrevote(),
}
}
// makeProtoRequestVoteResponse converts a RequestVoteResponse instance to a protobuf RequestVoteResponse instance.
func makeProtoRequestVoteResponse(response RequestVoteResponse) *pb.RequestVoteResponse {
return &pb.RequestVoteResponse{
Term: response.Term,
VoteGranted: response.VoteGranted,
}
}
// makeAppendEntriesRequest converts a protobuf AppendEntriesRequest instance to an AppendEntriesRequest instance.
func makeAppendEntriesRequest(request *pb.AppendEntriesRequest) AppendEntriesRequest {
return AppendEntriesRequest{
LeaderID: request.GetLeaderId(),
Term: request.GetTerm(),
LeaderCommit: request.GetLeaderCommit(),
PrevLogIndex: request.GetPrevLogIndex(),
PrevLogTerm: request.GetPrevLogTerm(),
Entries: makeEntries(request.GetEntries()),
}
}
// makeProtoAppendEntriesResponse converts an AppendEntriesResponse instance to a protobuf AppendEntriesResponse instance.
func makeProtoAppendEntriesResponse(response AppendEntriesResponse) *pb.AppendEntriesResponse {
return &pb.AppendEntriesResponse{
Success: response.Success,
Term: response.Term,
Index: response.Index,
}
}
// makeInstallSnapshotRequest converts a protobuf InstallSnapshotRequest instance to a InstallSnapshotRequest instance.
func makeInstallSnapshotRequest(request *pb.InstallSnapshotRequest) InstallSnapshotRequest {
return InstallSnapshotRequest{
LeaderID: request.GetLeader(),
Term: request.GetTerm(),
LastIncludedIndex: request.GetLastIncludedIndex(),
LastIncludedTerm: request.GetLastIncludedTerm(),
Configuration: request.GetConfiguration(),
Bytes: request.GetData(),
Offset: request.GetOffset(),
Done: request.GetDone(),
}
}
// makeProtoInstallSnapshotResponse converts an InstallSnapshotResponse instance to a protobuf InstallSnapshotResponse instance.
func makeProtoInstallSnapshotResponse(
response InstallSnapshotResponse,
) *pb.InstallSnapshotResponse {
return &pb.InstallSnapshotResponse{
Term: response.Term,
BytesWritten: response.BytesWritten,
}
}