error-pages/internal/cli/root.go
2021-09-29 20:38:50 +05:00

94 lines
2.7 KiB
Go

// Package cli contains CLI command handlers.
package cli
import (
"context"
"fmt"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/tarampampam/error-pages/internal/checkers"
buildCmd "github.com/tarampampam/error-pages/internal/cli/build"
healthcheckCmd "github.com/tarampampam/error-pages/internal/cli/healthcheck"
serveCmd "github.com/tarampampam/error-pages/internal/cli/serve"
versionCmd "github.com/tarampampam/error-pages/internal/cli/version"
"github.com/tarampampam/error-pages/internal/env"
"github.com/tarampampam/error-pages/internal/logger"
"github.com/tarampampam/error-pages/internal/version"
)
const configFileFlagName = "config-file"
// NewCommand creates root command.
func NewCommand(appName string) *cobra.Command { //nolint:funlen
var (
configFile string
verbose bool
debug bool
logJSON bool
)
ctx := context.Background() // main CLI context
// create "default" logger (will be overwritten later with customized)
log, err := logger.New(false, false, false)
if err != nil {
panic(err)
}
cmd := &cobra.Command{
Use: appName,
PersistentPreRunE: func(c *cobra.Command, _ []string) error {
_ = log.Sync() // sync previous logger instance
customizedLog, e := logger.New(verbose, debug, logJSON)
if e != nil {
return e
}
*log = *customizedLog // override "default" logger with customized
c.Flags().VisitAll(func(flag *pflag.Flag) {
// flag was NOT defined using CLI (flags should have maximal priority)
if !flag.Changed && flag.Name == configFileFlagName {
if envConfigFile, exists := env.ConfigFilePath.Lookup(); exists && envConfigFile != "" {
configFile = envConfigFile
}
}
})
return nil
},
PersistentPostRun: func(*cobra.Command, []string) {
// error ignoring reasons:
// - <https://github.com/uber-go/zap/issues/772>
// - <https://github.com/uber-go/zap/issues/328>
_ = log.Sync()
},
SilenceErrors: true,
SilenceUsage: true,
CompletionOptions: cobra.CompletionOptions{
DisableDefaultCmd: true,
},
}
cmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose output")
cmd.PersistentFlags().BoolVarP(&debug, "debug", "", false, "debug output")
cmd.PersistentFlags().BoolVarP(&logJSON, "log-json", "", false, "logs in JSON format")
cmd.PersistentFlags().StringVarP(
&configFile,
configFileFlagName, "c",
"./error-pages.yml",
fmt.Sprintf("path to the config file [$%s]", env.ConfigFilePath),
)
cmd.AddCommand(
versionCmd.NewCommand(version.Version()),
healthcheckCmd.NewCommand(checkers.NewHealthChecker(ctx)),
buildCmd.NewCommand(log, &configFile),
serveCmd.NewCommand(ctx, log, &configFile),
)
return cmd
}