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transporter.go
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/
transporter.go
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package server
import (
"bytes"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"time"
"github.com/coreos/etcd/log"
"github.com/coreos/etcd/third_party/github.com/goraft/raft"
httpclient "github.com/coreos/etcd/third_party/github.com/mreiferson/go-httpclient"
)
const (
snapshotTimeout = time.Second * 120
)
// Transporter layer for communication between raft nodes
type transporter struct {
followersStats *raftFollowersStats
serverStats *raftServerStats
registry *Registry
client *http.Client
transport *httpclient.Transport
snapshotClient *http.Client
snapshotTransport *httpclient.Transport
}
type dialer func(network, addr string) (net.Conn, error)
// Create transporter using by raft server
// Create http or https transporter based on
// whether the user give the server cert and key
func NewTransporter(followersStats *raftFollowersStats, serverStats *raftServerStats, registry *Registry, dialTimeout, requestTimeout, responseHeaderTimeout time.Duration) *transporter {
tr := &httpclient.Transport{
ResponseHeaderTimeout: responseHeaderTimeout,
// This is a workaround for Transport.CancelRequest doesn't work on
// HTTPS connections blocked. The patch for it is in progress,
// and would be available in Go1.3
// More: https://codereview.appspot.com/69280043/
ConnectTimeout: dialTimeout,
RequestTimeout: requestTimeout,
}
// Sending snapshot might take a long time so we use a different HTTP transporter
// Timeout is set to 120s (Around 100MB if the bandwidth is 10Mbits/s)
// This timeout is not calculated by heartbeat time.
// TODO(xiangl1) we can actually calculate the max bandwidth if we know
// average RTT.
// It should be equal to (TCP max window size/RTT).
sTr := &httpclient.Transport{
ConnectTimeout: dialTimeout,
RequestTimeout: snapshotTimeout,
}
t := transporter{
client: &http.Client{Transport: tr},
transport: tr,
snapshotClient: &http.Client{Transport: sTr},
snapshotTransport: sTr,
followersStats: followersStats,
serverStats: serverStats,
registry: registry,
}
return &t
}
func (t *transporter) SetTLSConfig(tlsConf tls.Config) {
t.transport.TLSClientConfig = &tlsConf
t.transport.DisableCompression = true
t.snapshotTransport.TLSClientConfig = &tlsConf
t.snapshotTransport.DisableCompression = true
}
// 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 b bytes.Buffer
if _, err := req.Encode(&b); err != nil {
log.Warn("transporter.ae.encoding.error:", err)
return nil
}
size := b.Len()
t.serverStats.SendAppendReq(size)
u, _ := t.registry.PeerURL(peer.Name)
log.Debugf("Send LogEntries to %s ", u)
thisFollowerStats, ok := t.followersStats.Followers[peer.Name]
if !ok { //this is the first time this follower has been seen
thisFollowerStats = &raftFollowerStats{}
thisFollowerStats.Latency.Minimum = 1 << 63
t.followersStats.Followers[peer.Name] = thisFollowerStats
}
start := time.Now()
resp, _, err := t.Post(fmt.Sprintf("%s/log/append", u), &b)
end := time.Now()
if err != nil {
log.Debugf("Cannot send AppendEntriesRequest to %s: %s", u, err)
if ok {
thisFollowerStats.Fail()
}
return nil
} else {
if ok {
thisFollowerStats.Succ(end.Sub(start))
}
}
if resp != nil {
defer resp.Body.Close()
aeresp := &raft.AppendEntriesResponse{}
if _, err = aeresp.Decode(resp.Body); err != nil && err != io.EOF {
log.Warn("transporter.ae.decoding.error:", err)
return nil
}
return aeresp
}
return nil
}
// 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 b bytes.Buffer
if _, err := req.Encode(&b); err != nil {
log.Warn("transporter.vr.encoding.error:", err)
return nil
}
u, _ := t.registry.PeerURL(peer.Name)
log.Debugf("Send Vote from %s to %s", server.Name(), u)
resp, _, err := t.Post(fmt.Sprintf("%s/vote", u), &b)
if err != nil {
log.Debugf("Cannot send VoteRequest to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
rvrsp := &raft.RequestVoteResponse{}
if _, err = rvrsp.Decode(resp.Body); err != nil && err != io.EOF {
log.Warn("transporter.vr.decoding.error:", err)
return nil
}
return rvrsp
}
return nil
}
// 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 b bytes.Buffer
if _, err := req.Encode(&b); err != nil {
log.Warn("transporter.ss.encoding.error:", err)
return nil
}
u, _ := t.registry.PeerURL(peer.Name)
log.Debugf("Send Snapshot Request from %s to %s", server.Name(), u)
resp, _, err := t.Post(fmt.Sprintf("%s/snapshot", u), &b)
if err != nil {
log.Debugf("Cannot send Snapshot Request to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
ssrsp := &raft.SnapshotResponse{}
if _, err = ssrsp.Decode(resp.Body); err != nil && err != io.EOF {
log.Warn("transporter.ss.decoding.error:", err)
return nil
}
return ssrsp
}
return nil
}
// 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 b bytes.Buffer
if _, err := req.Encode(&b); err != nil {
log.Warn("transporter.ss.encoding.error:", err)
return nil
}
u, _ := t.registry.PeerURL(peer.Name)
log.Debugf("Send Snapshot Recovery from %s to %s", server.Name(), u)
resp, err := t.PostSnapshot(fmt.Sprintf("%s/snapshotRecovery", u), &b)
if err != nil {
log.Debugf("Cannot send Snapshot Recovery to %s : %s", u, err)
}
if resp != nil {
defer resp.Body.Close()
ssrrsp := &raft.SnapshotRecoveryResponse{}
if _, err = ssrrsp.Decode(resp.Body); err != nil && err != io.EOF {
log.Warn("transporter.ssr.decoding.error:", err)
return nil
}
return ssrrsp
}
return nil
}
// 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
}
// Send server side PUT request
func (t *transporter) Put(urlStr string, body io.Reader) (*http.Response, *http.Request, error) {
req, _ := http.NewRequest("PUT", urlStr, body)
resp, err := t.client.Do(req)
return resp, req, err
}
// PostSnapshot posts a json format snapshot to the given url
// The underlying HTTP transport has a minute level timeout
func (t *transporter) PostSnapshot(url string, body io.Reader) (*http.Response, error) {
return t.snapshotClient.Post(url, "application/json", body)
}