71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
package raft
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import (
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"code.google.com/p/goprotobuf/proto"
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"github.com/goraft/raft/protobuf"
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"io"
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"io/ioutil"
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)
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// The request sent to a server to start from the snapshot.
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type SnapshotRequest struct {
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LeaderName string
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LastIndex uint64
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LastTerm uint64
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}
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//------------------------------------------------------------------------------
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//
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// Constructors
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//
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//------------------------------------------------------------------------------
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// Creates a new Snapshot request.
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func newSnapshotRequest(leaderName string, snapshot *Snapshot) *SnapshotRequest {
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return &SnapshotRequest{
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LeaderName: leaderName,
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LastIndex: snapshot.LastIndex,
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LastTerm: snapshot.LastTerm,
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}
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}
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// Encodes the SnapshotRequest to a buffer. Returns the number of bytes
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// written and any error that may have occurred.
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func (req *SnapshotRequest) encode(w io.Writer) (int, error) {
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pb := &protobuf.ProtoSnapshotRequest{
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LeaderName: proto.String(req.LeaderName),
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LastIndex: proto.Uint64(req.LastIndex),
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LastTerm: proto.Uint64(req.LastTerm),
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}
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p, err := proto.Marshal(pb)
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if err != nil {
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return -1, err
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}
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return w.Write(p)
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}
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// Decodes the SnapshotRequest from a buffer. Returns the number of bytes read and
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// any error that occurs.
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func (req *SnapshotRequest) decode(r io.Reader) (int, error) {
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data, err := ioutil.ReadAll(r)
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if err != nil {
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return 0, err
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}
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totalBytes := len(data)
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pb := &protobuf.ProtoSnapshotRequest{}
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if err := proto.Unmarshal(data, pb); err != nil {
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return -1, err
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}
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req.LeaderName = pb.GetLeaderName()
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req.LastIndex = pb.GetLastIndex()
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req.LastTerm = pb.GetLastTerm()
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return totalBytes, nil
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}
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