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transporter.go
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transporter.go
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package main
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"time"
"github.com/coreos/go-raft"
)
// Timeout for setup internal raft http connection
// This should not exceed 3 * RTT
var dailTimeout = 3 * HeartbeatTimeout
// Timeout for setup internal raft http connection + receive response header
// This should not exceed 3 * RTT + RTT
var responseHeaderTimeout = 4 * HeartbeatTimeout
// Timeout for receiving the response body from the server
// This should not exceed election timeout
var tranTimeout = ElectionTimeout
// Transporter layer for communication between raft nodes
type transporter struct {
client *http.Client
transport *http.Transport
}
// Create transporter using by raft server
// Create http or https transporter based on
// whether the user give the server cert and key
func newTransporter(scheme string, tlsConf tls.Config) *transporter {
t := transporter{}
tr := &http.Transport{
Dial: dialWithTimeout,
ResponseHeaderTimeout: responseHeaderTimeout,
}
if scheme == "https" {
tr.TLSClientConfig = &tlsConf
tr.DisableCompression = true
}
t.client = &http.Client{Transport: tr}
t.transport = tr
return &t
}
// Dial with timeout
func dialWithTimeout(network, addr string) (net.Conn, error) {
return net.DialTimeout(network, addr, dailTimeout)
}
// Sends AppendEntries RPCs to a peer when the server is the leader.
func (t *transporter) SendAppendEntriesRequest(server *raft.Server, peer *raft.Peer, req *raft.AppendEntriesRequest) *raft.AppendEntriesResponse {
var aersp *raft.AppendEntriesResponse
var b bytes.Buffer
json.NewEncoder(&b).Encode(req)
size := b.Len()
r.serverStats.SendAppendReq(size)
u, _ := nameToRaftURL(peer.Name)
debugf("Send LogEntries to %s ", u)
thisFollowerStats, ok := r.followersStats.Followers[peer.Name]
if !ok { //this is the first time this follower has been seen
thisFollowerStats = &raftFollowerStats{}
thisFollowerStats.Latency.Minimum = 1 << 63
r.followersStats.Followers[peer.Name] = thisFollowerStats
}
start := time.Now()
resp, httpRequest, err := t.Post(fmt.Sprintf("%s/log/append", u), &b)
end := time.Now()
if err != nil {
debugf("Cannot send AppendEntriesRequest to %s: %s", u, err)
if ok {
thisFollowerStats.Fail()
}
} else {
if ok {
thisFollowerStats.Succ(end.Sub(start))
}
}
if resp != nil {
defer resp.Body.Close()
t.CancelWhenTimeout(httpRequest)
aersp = &raft.AppendEntriesResponse{}
if err := json.NewDecoder(resp.Body).Decode(&aersp); err == nil || err == io.EOF {
return aersp
}
}
return aersp
}
// Sends RequestVote RPCs to a peer when the server is the candidate.
func (t *transporter) SendVoteRequest(server *raft.Server, peer *raft.Peer, req *raft.RequestVoteRequest) *raft.RequestVoteResponse {
var rvrsp *raft.RequestVoteResponse
var b bytes.Buffer
json.NewEncoder(&b).Encode(req)
u, _ := nameToRaftURL(peer.Name)
debugf("Send Vote to %s", u)
resp, httpRequest, err := t.Post(fmt.Sprintf("%s/vote", u), &b)
if err != nil {
debugf("Cannot send VoteRequest to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
t.CancelWhenTimeout(httpRequest)
rvrsp := &raft.RequestVoteResponse{}
if err := json.NewDecoder(resp.Body).Decode(&rvrsp); err == nil || err == io.EOF {
return rvrsp
}
}
return rvrsp
}
// Sends SnapshotRequest RPCs to a peer when the server is the candidate.
func (t *transporter) SendSnapshotRequest(server *raft.Server, peer *raft.Peer, req *raft.SnapshotRequest) *raft.SnapshotResponse {
var aersp *raft.SnapshotResponse
var b bytes.Buffer
json.NewEncoder(&b).Encode(req)
u, _ := nameToRaftURL(peer.Name)
debugf("Send Snapshot to %s [Last Term: %d, LastIndex %d]", u,
req.LastTerm, req.LastIndex)
resp, httpRequest, err := t.Post(fmt.Sprintf("%s/snapshot", u), &b)
if err != nil {
debugf("Cannot send SendSnapshotRequest to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
t.CancelWhenTimeout(httpRequest)
aersp = &raft.SnapshotResponse{}
if err = json.NewDecoder(resp.Body).Decode(&aersp); err == nil || err == io.EOF {
return aersp
}
}
return aersp
}
// Sends SnapshotRecoveryRequest RPCs to a peer when the server is the candidate.
func (t *transporter) SendSnapshotRecoveryRequest(server *raft.Server, peer *raft.Peer, req *raft.SnapshotRecoveryRequest) *raft.SnapshotRecoveryResponse {
var aersp *raft.SnapshotRecoveryResponse
var b bytes.Buffer
json.NewEncoder(&b).Encode(req)
u, _ := nameToRaftURL(peer.Name)
debugf("Send SnapshotRecovery to %s [Last Term: %d, LastIndex %d]", u,
req.LastTerm, req.LastIndex)
resp, _, err := t.Post(fmt.Sprintf("%s/snapshotRecovery", u), &b)
if err != nil {
debugf("Cannot send SendSnapshotRecoveryRequest to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
aersp = &raft.SnapshotRecoveryResponse{}
if err = json.NewDecoder(resp.Body).Decode(&aersp); err == nil || err == io.EOF {
return aersp
}
}
return aersp
}
// Send server side POST request
func (t *transporter) Post(urlStr string, body io.Reader) (*http.Response, *http.Request, error) {
req, _ := http.NewRequest("POST", urlStr, body)
resp, err := t.client.Do(req)
return resp, req, err
}
// Send server side GET request
func (t *transporter) Get(urlStr string) (*http.Response, *http.Request, error) {
req, _ := http.NewRequest("GET", urlStr, nil)
resp, err := t.client.Do(req)
return resp, req, err
}
// Cancel the on fly HTTP transaction when timeout happens
func (t *transporter) CancelWhenTimeout(req *http.Request) {
go func() {
time.Sleep(ElectionTimeout)
t.transport.CancelRequest(req)
}()
}