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package main
import (
"context"
"fmt"
"io"
stdlog "log"
"os"
"os/signal"
"syscall"
"github.com/github/github-mcp-server/pkg/github"
iolog "github.com/github/github-mcp-server/pkg/log"
"github.com/github/github-mcp-server/pkg/translations"
gogithub "github.com/google/go-github/v69/github"
"github.com/mark3labs/mcp-go/server"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
var (
rootCmd = &cobra.Command{
Use: "server",
Short: "GitHub MCP Server",
Long: `A GitHub MCP server that handles various tools and resources.`,
}
stdioCmd = &cobra.Command{
Use: "stdio",
Short: "Start stdio server",
Long: `Start a server that communicates via standard input/output streams using JSON-RPC messages.`,
Run: func(_ *cobra.Command, _ []string) {
logFile := viper.GetString("log-file")
readOnly := viper.GetBool("read-only")
exportTranslations := viper.GetBool("export-translations")
logger, err := initLogger(logFile)
if err != nil {
stdlog.Fatal("Failed to initialize logger:", err)
}
logCommands := viper.GetBool("enable-command-logging")
if err := runStdioServer(readOnly, logger, logCommands, exportTranslations); err != nil {
stdlog.Fatal("failed to run stdio server:", err)
}
},
}
)
func init() {
cobra.OnInitialize(initConfig)
// Add global flags that will be shared by all commands
rootCmd.PersistentFlags().Bool("read-only", false, "Restrict the server to read-only operations")
rootCmd.PersistentFlags().String("log-file", "", "Path to log file")
rootCmd.PersistentFlags().Bool("enable-command-logging", false, "When enabled, the server will log all command requests and responses to the log file")
rootCmd.PersistentFlags().Bool("export-translations", false, "Save translations to a JSON file")
rootCmd.PersistentFlags().String("gh-host", "", "Specify the GitHub hostname (for GitHub Enterprise etc.)")
// Bind flag to viper
_ = viper.BindPFlag("read-only", rootCmd.PersistentFlags().Lookup("read-only"))
_ = viper.BindPFlag("log-file", rootCmd.PersistentFlags().Lookup("log-file"))
_ = viper.BindPFlag("enable-command-logging", rootCmd.PersistentFlags().Lookup("enable-command-logging"))
_ = viper.BindPFlag("export-translations", rootCmd.PersistentFlags().Lookup("export-translations"))
_ = viper.BindPFlag("gh-host", rootCmd.PersistentFlags().Lookup("gh-host"))
// Add subcommands
rootCmd.AddCommand(stdioCmd)
}
func initConfig() {
// Initialize Viper configuration
viper.SetEnvPrefix("APP")
viper.AutomaticEnv()
}
func initLogger(outPath string) (*log.Logger, error) {
if outPath == "" {
return log.New(), nil
}
file, err := os.OpenFile(outPath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
if err != nil {
return nil, fmt.Errorf("failed to open log file: %w", err)
}
logger := log.New()
logger.SetLevel(log.DebugLevel)
logger.SetOutput(file)
return logger, nil
}
func runStdioServer(readOnly bool, logger *log.Logger, logCommands bool, exportTranslations bool) error {
// Create app context
ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
defer stop()
// Create GH client
token := os.Getenv("GITHUB_PERSONAL_ACCESS_TOKEN")
if token == "" {
logger.Fatal("GITHUB_PERSONAL_ACCESS_TOKEN not set")
}
ghClient := gogithub.NewClient(nil).WithAuthToken(token)
ghClient.UserAgent = "github-mcp-server/1.0"
// Check GH_HOST env var first, then fall back to viper config
host := os.Getenv("GH_HOST")
if host == "" {
host = viper.GetString("gh-host")
}
if host != "" {
var err error
ghClient, err = ghClient.WithEnterpriseURLs(host, host)
if err != nil {
return fmt.Errorf("failed to create GitHub client with host: %w", err)
}
}
t, dumpTranslations := translations.TranslationHelper()
// Create
ghServer := github.NewServer(ghClient, readOnly, t)
stdioServer := server.NewStdioServer(ghServer)
stdLogger := stdlog.New(logger.Writer(), "stdioserver", 0)
stdioServer.SetErrorLogger(stdLogger)
if exportTranslations {
// Once server is initialized, all translations are loaded
dumpTranslations()
}
// Start listening for messages
errC := make(chan error, 1)
go func() {
in, out := io.Reader(os.Stdin), io.Writer(os.Stdout)
if logCommands {
loggedIO := iolog.NewIOLogger(in, out, logger)
in, out = loggedIO, loggedIO
}
errC <- stdioServer.Listen(ctx, in, out)
}()
// Output github-mcp-server string
_, _ = fmt.Fprintf(os.Stderr, "GitHub MCP Server running on stdio\n")
// Wait for shutdown signal
select {
case <-ctx.Done():
logger.Infof("shutting down server...")
case err := <-errC:
if err != nil {
return fmt.Errorf("error running server: %w", err)
}
}
return nil
}
func main() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}