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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"os"
"github.com/alecthomas/kong"
"github.com/marcelbeumer/go-playground/gochat/internal/chat"
"github.com/marcelbeumer/go-playground/gochat/internal/grpc"
"github.com/marcelbeumer/go-playground/gochat/internal/log"
"github.com/marcelbeumer/go-playground/gochat/internal/websocket"
)
type ClientServerOpts struct {
Host string `help:"Server host." short:"h" default:"127.0.0.1" env:"HOST"`
Port int `help:"Server port." short:"p" default:"9998" env:"PORT"`
Grpc bool `help:"Use GRPC instead of websockets"`
}
type ClientOpts struct {
Username string `help:"Username." required:"" short:"u"`
StdoutFrontend bool `help:"Use simple stdout frontend." short:"s"`
}
type Commands struct {
Verbose bool `help:"Verbose (logging info)" short:"v"`
VeryVerbose bool `help:"Very verbose (logging debug)" short:"V"`
Client struct {
ClientServerOpts
ClientOpts
} `help:"Start client" cmd:"client"`
Server struct {
ClientServerOpts
} `help:"Start server" cmd:"client"`
}
func main() {
cli := Commands{}
ctx := kong.Parse(
&cli,
kong.Name("gochat"),
kong.UsageOnError(),
)
switch ctx.Command() {
case "client":
stdErrBuf := bufio.NewWriter(os.Stderr)
zl := log.NewZapLogger(stdErrBuf, cli.Verbose, cli.VeryVerbose)
log.RedirectStdLog(zl)
logger := log.NewZapLoggerAdapter(zl)
exit := func(code int) {
_ = zl.Sync()
stdErrBuf.Flush()
os.Exit(code)
}
defer exit(0)
addr := fmt.Sprintf("%s:%d", cli.Server.Host, cli.Server.Port)
var conn chat.Connection
var err error
if cli.Client.Grpc {
conn, err = grpc.NewClientConnection(addr, cli.Client.Username, logger)
} else {
conn, err = websocket.NewClientConnection(addr, cli.Client.Username, logger)
}
if err != nil {
logger.Errorw(
"could not create connection",
log.Error(err),
"addr", addr,
)
exit(1)
}
defer conn.Close(nil)
frontendErr := func(err error) {
logger.Error("frontend error", log.Error(err))
exit(1)
}
if cli.Client.StdoutFrontend {
fe := chat.NewStdoutFrontend(conn, logger)
if err := fe.Start(); err != nil {
frontendErr(err)
}
} else {
fe, err := chat.NewGUIFrontend(conn, logger)
if err != nil {
frontendErr(err)
}
if err := fe.Start(); err != nil {
frontendErr(err)
}
}
case "server":
zl := log.NewZapLogger(os.Stderr, cli.Verbose, cli.VeryVerbose)
log.RedirectStdLog(zl)
logger := log.NewZapLoggerAdapter(zl)
exit := func(code int) {
_ = zl.Sync()
os.Exit(code)
}
addr := fmt.Sprintf("%s:%d", cli.Server.Host, cli.Server.Port)
if cli.Server.Grpc {
s := grpc.NewServer(logger)
if err := s.Start(addr); err != nil {
logger.Error("server error", log.Error(err))
exit(1)
}
} else {
s := websocket.NewServer(logger)
if err := s.Start(addr); err != nil {
logger.Error("server error", log.Error(err))
exit(1)
}
}
}
}