/
main.go
144 lines (115 loc) · 2.52 KB
/
main.go
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package main
import (
"bytes"
"flag"
"log"
"math/rand"
"net/http"
"net/url"
"strings"
"time"
"fmt"
"os"
"encoding/gob"
"github.com/peterbourgon/raft"
)
var (
s *raft.Server
httpAddr = flag.String("http", ":8080", "HTTP service address (e.g., ':8080')")
id = flag.Int64("id", 1, "Raft server ID. Must be > 0")
peerAddrs = flag.String("peers", "http://127.0.0.1:8080", "HTTP service address (e.g., 'http://0.0.0.0:8080,http://0.0.0.0:8081,http://0.0.0.0:8082')")
)
// Helper function to parse URLs
func mustParseURL(rawurl string) *url.URL {
u, err := url.Parse(rawurl)
if err != nil {
panic(err)
}
u.Path = ""
return u
}
// Helper function to construct HTTP Peers
func mustNewHTTPPeer(u *url.URL) raft.Peer {
p, err := raft.NewHTTPPeer(u)
if err != nil {
panic(err)
}
return p
}
func mustNewPeers() (peers []raft.Peer) {
for _, s := range strings.Split(*peerAddrs, ",") {
peers = append(peers, mustNewHTTPPeer(mustParseURL(s)))
}
return
}
func main() {
flag.Parse()
start()
}
func start() {
rand.Seed(42)
// Construct the server
s = raft.NewServer(uint64(*id), &bytes.Buffer{}, apply)
// Expose the server using a HTTP transport
raft.HTTPTransport(http.DefaultServeMux, s)
http.HandleFunc("/response", response)
serve := func() {
err := http.ListenAndServe(*httpAddr, nil)
if err != nil {
panic(err)
} else {
log.Println("contd")
}
}
go serve()
time.Sleep(time.Second * 5)
peers := mustNewPeers()
// Set the initial server configuration
s.SetConfiguration(peers...)
// Start the server
s.Start()
fmt.Println("READY!")
dn, _ := os.Open("/dev/null")
log.SetOutput(dn)
for {
cmd := make(chan []byte)
var bytz []byte
buf := bytes.NewBuffer(bytz)
enc := gob.NewEncoder(buf)
err := enc.Encode(parseQuery())
if err != nil {
panic(err)
}
if err := s.Command(buf.Bytes(), cmd); err != nil {
panic(err)
}
fmt.Println(string(<-cmd))
}
}
func apply(mid uint64, msg []byte) []byte {
var q Query
buf := bytes.NewBuffer(msg)
dec := gob.NewDecoder(buf)
err := dec.Decode(&q)
if err != nil {
return []byte(err.Error())
}
if err = q.Do(); err != nil {
q.Msg = err.Error()
}
q.Id = mid
q.ResponderID = *id
buf.Reset()
enc := gob.NewEncoder(buf)
if err := enc.Encode(q); err != nil {
return []byte(err.Error())
}
if resp, err := http.Post(q.Sender, "", buf); err != nil {
return []byte(err.Error())
} else {
if resp.StatusCode == 500 {
return []byte("Failed to report back")
}
}
return []byte("Command sent succesfully!")
}