/
main.go
108 lines (94 loc) · 2.3 KB
/
main.go
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package main
import (
"bufio"
"bytes"
"context"
"crypto/ed25519"
"crypto/rand"
"encoding/base64"
"flag"
"io"
"log"
"os"
"os/signal"
"strings"
"syscall"
"github.com/uhthomas/pastry"
"golang.org/x/crypto/blake2b"
"golang.org/x/sync/errgroup"
)
func main() {
addr := flag.String("addr", ":2376", "The address to listen on")
dial := flag.String("dial", "", "a comma separated list of addresses to connect to")
flag.Parse()
// Generate key for node
var seed [ed25519.SeedSize]byte
if _, err := io.ReadFull(rand.Reader, seed[:]); err != nil {
log.Fatal(err)
}
n, err := pastry.New(
// Pass logger to node
pastry.DebugLogger,
// Pass ed25519 seed to node
pastry.Seed(seed[:]),
// Use a forwarding func to log forwarded requests or modify next
pastry.Forward(pastry.ForwarderFunc(func(ctx context.Context, next, key []byte, r io.Reader) error {
// forwarding to <next> with <key> and body <r>
return nil
})),
// Handle received messages
pastry.Deliver(pastry.DelivererFunc(func(ctx context.Context, key []byte, r io.Reader) error {
// message <key> with body <r> delivered
var s strings.Builder
if _, err := io.Copy(&s, r); err != nil {
return err
}
log.Printf(
"Message %s delivered with body %s",
base64.RawURLEncoding.EncodeToString(key),
s.String(),
)
return nil
})),
)
if err != nil {
log.Fatal(err)
}
ctx, cancel := context.WithCancel(context.Background())
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error { return n.ListenAndServe(ctx, *addr) })
g.Go(func() error {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
select {
case <-c:
cancel()
return n.Close()
case <-ctx.Done():
return ctx.Err()
}
})
go func() {
defer cancel()
for r := bufio.NewScanner(os.Stdin); r.Scan(); {
b := r.Bytes()
h := blake2b.Sum256(b)
if err := n.Route(ctx, h[:], bytes.NewReader(b)); err != nil {
log.Fatal(err)
}
}
}()
log.Printf("Listening on %s\n", *addr)
if s := strings.Fields(strings.TrimSpace(*dial)); len(s) > 0 {
log.Printf("Connecting to %d nodes\n", len(s))
for _, addr := range s {
log.Printf("Connecting to %s\n", addr)
if err := n.DialAndAccept(ctx, addr); err != nil {
log.Fatal(err)
}
}
}
if err := g.Wait(); err != nil {
log.Fatal(err)
}
}