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http_transporter.go
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http_transporter.go
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package raft
import (
"bytes"
"fmt"
"io"
"net/http"
)
// Parts from this transporter were heavily influenced by Peter Bougon's
// raft implementation: https://github.com/peterbourgon/raft
//------------------------------------------------------------------------------
//
// Typedefs
//
//------------------------------------------------------------------------------
// An HTTPTransporter is a default transport layer used to communicate between
// multiple servers.
type HTTPTransporter struct {
DisableKeepAlives bool
prefix string
appendEntriesPath string
requestVotePath string
}
type HTTPMuxer interface {
HandleFunc(string, func(http.ResponseWriter, *http.Request))
}
//------------------------------------------------------------------------------
//
// Constructor
//
//------------------------------------------------------------------------------
// Creates a new HTTP transporter with the given path prefix.
func NewHTTPTransporter(prefix string) *HTTPTransporter {
return &HTTPTransporter{
DisableKeepAlives: false,
prefix: prefix,
appendEntriesPath: fmt.Sprintf("%s%s", prefix, "/appendEntries"),
requestVotePath: fmt.Sprintf("%s%s", prefix, "/requestVote"),
}
}
//------------------------------------------------------------------------------
//
// Accessors
//
//------------------------------------------------------------------------------
// Retrieves the path prefix used by the transporter.
func (t *HTTPTransporter) Prefix() string {
return t.prefix
}
// Retrieves the AppendEntries path.
func (t *HTTPTransporter) AppendEntriesPath() string {
return t.appendEntriesPath
}
// Retrieves the RequestVote path.
func (t *HTTPTransporter) RequestVotePath() string {
return t.requestVotePath
}
//------------------------------------------------------------------------------
//
// Methods
//
//------------------------------------------------------------------------------
//--------------------------------------
// Installation
//--------------------------------------
// Applies Raft routes to an HTTP router for a given server.
func (t *HTTPTransporter) Install(server *Server, mux HTTPMuxer) {
mux.HandleFunc(t.AppendEntriesPath(), t.appendEntriesHandler(server))
mux.HandleFunc(t.RequestVotePath(), t.requestVoteHandler(server))
}
//--------------------------------------
// Outgoing
//--------------------------------------
// Sends an AppendEntries RPC to a peer.
func (t *HTTPTransporter) SendAppendEntriesRequest(server *Server, peer *Peer, req *AppendEntriesRequest) *AppendEntriesResponse {
var b bytes.Buffer
if _, err := req.encode(&b); err != nil {
traceln("transporter.ae.encoding.error:", err)
return nil
}
url := fmt.Sprintf("http://%s%s", peer.Name, t.AppendEntriesPath())
traceln(server.Name(), "POST", url)
client := &http.Client{Transport: &http.Transport{DisableKeepAlives: t.DisableKeepAlives}}
httpResp, err := client.Post(url, "application/protobuf", &b)
if httpResp == nil || err != nil {
traceln("transporter.ae.response.error:", err)
return nil
}
defer httpResp.Body.Close()
resp := &AppendEntriesResponse{}
if _, err = resp.decode(httpResp.Body); err != nil && err != io.EOF {
traceln("transporter.ae.decoding.error:", err)
return nil
}
return resp
}
// Sends a RequestVote RPC to a peer.
func (t *HTTPTransporter) SendVoteRequest(server *Server, peer *Peer, req *RequestVoteRequest) *RequestVoteResponse {
var b bytes.Buffer
if _, err := req.encode(&b); err != nil {
traceln("transporter.rv.encoding.error:", err)
return nil
}
url := fmt.Sprintf("http://%s%s", peer.Name, t.RequestVotePath())
traceln(server.Name(), "POST", url)
client := &http.Client{Transport: &http.Transport{DisableKeepAlives: t.DisableKeepAlives}}
httpResp, err := client.Post(url, "application/protobuf", &b)
if httpResp == nil || err != nil {
traceln("transporter.rv.response.error:", err)
return nil
}
defer httpResp.Body.Close()
resp := &RequestVoteResponse{}
if _, err = resp.decode(httpResp.Body); err != nil && err != io.EOF {
traceln("transporter.rv.decoding.error:", err)
return nil
}
return resp
}
// Sends a SnapshotRequest RPC to a peer.
func (t *HTTPTransporter) SendSnapshotRequest(server *Server, peer *Peer, req *SnapshotRequest) *SnapshotResponse {
return nil
}
// Sends a SnapshotRequest RPC to a peer.
func (t *HTTPTransporter) SendSnapshotRecoveryRequest(server *Server, peer *Peer, req *SnapshotRecoveryRequest) *SnapshotRecoveryResponse {
return nil
}
//--------------------------------------
// Incoming
//--------------------------------------
// Handles incoming AppendEntries requests.
func (t *HTTPTransporter) appendEntriesHandler(server *Server) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
traceln(server.Name(), "RECV /appendEntries")
req := &AppendEntriesRequest{}
if _, err := req.decode(r.Body); err != nil {
http.Error(w, "", http.StatusBadRequest)
return
}
resp := server.AppendEntries(req)
if _, err := resp.encode(w); err != nil {
http.Error(w, "", http.StatusInternalServerError)
return
}
}
}
// Handles incoming RequestVote requests.
func (t *HTTPTransporter) requestVoteHandler(server *Server) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
traceln(server.Name(), "RECV /requestVote")
req := &RequestVoteRequest{}
if _, err := req.decode(r.Body); err != nil {
http.Error(w, "", http.StatusBadRequest)
return
}
resp := server.RequestVote(req)
if _, err := resp.encode(w); err != nil {
http.Error(w, "", http.StatusInternalServerError)
return
}
}
}