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main.go
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main.go
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// chat is an example showing how to use the clientrpc to send and receive
// messages.
//
// Messages to send are read from stdin, one message per line, in a <user> <msg>
// format.
//
// Messages received are sent to stdout, in the same format.
package main
import (
"bufio"
"context"
"errors"
"flag"
"fmt"
"os"
"strings"
"time"
"github.com/companyzero/bisonrelay/clientrpc/jsonrpc"
"github.com/companyzero/bisonrelay/clientrpc/types"
"github.com/decred/slog"
"golang.org/x/sync/errgroup"
)
func sendLoop(ctx context.Context, chat types.ChatServiceClient, log slog.Logger) error {
r := bufio.NewScanner(os.Stdin)
for r.Scan() {
line := strings.TrimSpace(r.Text())
if len(line) < 0 {
continue
}
tokens := strings.SplitN(line, " ", 2)
if len(tokens) != 2 {
log.Warn("Read line from stdin without 2 tokens")
continue
}
user, msg := tokens[0], tokens[1]
req := &types.PMRequest{
User: user,
Msg: &types.RMPrivateMessage{
Message: msg,
},
}
var res types.PMResponse
err := chat.PM(ctx, req, &res)
if errors.Is(err, context.Canceled) {
// Program is done.
return err
}
if err != nil {
// Decide on whether to retry, give up, warn operator,
// etc.
log.Warnf("Unable to send last message: %v", err)
continue
}
fmt.Printf("-> %v %v\n", user, msg)
}
return r.Err()
}
func receiveLoop(ctx context.Context, chat types.ChatServiceClient, log slog.Logger) error {
var ackRes types.AckResponse
var ackReq types.AckRequest
for {
// Keep requesting a new stream if the connection breaks. Also
// request any messages received since the last one we acked.
streamReq := types.PMStreamRequest{UnackedFrom: ackReq.SequenceId}
stream, err := chat.PMStream(ctx, &streamReq)
if errors.Is(err, context.Canceled) {
// Program is done.
return err
}
if err != nil {
log.Warn("Error while obtaining PM stream: %v", err)
time.Sleep(time.Second) // Wait to try again.
continue
}
for {
var pm types.ReceivedPM
err := stream.Recv(&pm)
if errors.Is(err, context.Canceled) {
// Program is done.
return err
}
if err != nil {
log.Warnf("Error while receiving stream: %v", err)
break
}
// Escape content before sending it to the terminal.
nick := escapeNick(pm.Nick)
var msg string
if pm.Msg != nil {
msg = escapeContent(pm.Msg.Message)
}
log.Debugf("Received PM from '%s' with len %d and sequence %s",
nick, len(msg), types.DebugSequenceID(pm.SequenceId))
fmt.Printf("<- %v %v\n", nick, msg)
// Ack to client that message is processed.
ackReq.SequenceId = pm.SequenceId
err = chat.AckReceivedPM(ctx, &ackReq, &ackRes)
if err != nil {
log.Warnf("Error while ack'ing received pm: %v", err)
break
}
}
time.Sleep(time.Second)
}
}
var (
flagURL = flag.String("url", "wss://127.0.0.1:7676/ws", "URL of the websocket endpoint")
flagServerCertPath = flag.String("servercert", "~/.brclient/rpc.cert", "Path to rpc.cert file")
flagClientCertPath = flag.String("clientcert", "~/.brclient/rpc-client.cert", "Path to rpc-client.cert file")
flagClientKeyPath = flag.String("clientkey", "~/.brclient/rpc-client.key", "Path to rpc-client.key file")
)
func realMain() error {
flag.Parse()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
g, gctx := errgroup.WithContext(ctx)
bknd := slog.NewBackend(os.Stderr)
log := bknd.Logger("EXMP")
log.SetLevel(slog.LevelInfo)
c, err := jsonrpc.NewWSClient(
jsonrpc.WithWebsocketURL(*flagURL),
jsonrpc.WithServerTLSCertPath(*flagServerCertPath),
jsonrpc.WithClientTLSCert(*flagClientCertPath, *flagClientKeyPath),
jsonrpc.WithClientLog(log),
)
if err != nil {
return err
}
chat := types.NewChatServiceClient(c)
g.Go(func() error { return c.Run(gctx) })
g.Go(func() error { return sendLoop(gctx, chat, log) })
g.Go(func() error { return receiveLoop(gctx, chat, log) })
return g.Wait()
}
func main() {
err := realMain()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}