youtubebeat/vendor/github.com/elastic/beats/libbeat/common/cli/cli.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package cli
import (
"fmt"
"os"
"runtime/debug"
"github.com/spf13/cobra"
)
func exitOnPanic() {
if r := recover(); r != nil {
fmt.Fprintf(os.Stderr, "panic: %s\n", r)
debug.PrintStack()
os.Exit(1)
}
}
// RunWith wrap cli function with an error handler instead of having the code exit early.
func RunWith(
fn func(cmd *cobra.Command, args []string) error,
) func(cmd *cobra.Command, args []string) {
return func(cmd *cobra.Command, args []string) {
defer exitOnPanic()
if err := fn(cmd, args); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
}
}
}
// GetEnvOr return the value of the environment variable if the value is set, if its not set it will
// return the default value.
//
// Note: if the value is set but it is an empty string we will return the empty string.
func GetEnvOr(name, def string) string {
if env, ok := os.LookupEnv(name); ok {
return env
}
return def
}