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2fc19136c1
- replace all stray calls of os.Exit() to util.CheckError() instead - CheckError() now checks if the klog verbosity level is >=5 and shows a stack trace of the error - don't call klog.Fatal in version.go
109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import (
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"flag"
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"fmt"
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"os"
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"strconv"
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"strings"
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errorsutil "k8s.io/apimachinery/pkg/util/errors"
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)
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const (
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// DefaultErrorExitCode defines exit the code for failed action generally
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DefaultErrorExitCode = 1
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// PreFlightExitCode defines exit the code for preflight checks
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PreFlightExitCode = 2
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// ValidationExitCode defines the exit code validation checks
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ValidationExitCode = 3
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)
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// fatal prints the message if set and then exits.
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func fatal(msg string, code int) {
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if len(msg) > 0 {
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// add newline if needed
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if !strings.HasSuffix(msg, "\n") {
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msg += "\n"
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}
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fmt.Fprint(os.Stderr, msg)
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}
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os.Exit(code)
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}
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// CheckErr prints a user friendly error to STDERR and exits with a non-zero
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// exit code. Unrecognized errors will be printed with an "error: " prefix.
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//
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// This method is generic to the command in use and may be used by non-Kubectl
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// commands.
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func CheckErr(err error) {
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checkErr(err, fatal)
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}
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// preflightError allows us to know if the error is a preflight error or not
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// defining the interface here avoids an import cycle of pulling in preflight into the util package
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type preflightError interface {
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Preflight() bool
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}
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// checkErr formats a given error as a string and calls the passed handleErr
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// func with that string and an exit code.
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func checkErr(err error, handleErr func(string, int)) {
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var msg string
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if err != nil {
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msg = fmt.Sprintf("%s\nTo see the stack trace of this error execute with --v=5 or higher", err.Error())
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// check if the verbosity level in klog is high enough and print a stack trace.
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f := flag.CommandLine.Lookup("v")
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if f != nil {
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// assume that the "v" flag contains a parseable Int32 as per klog's "Level" type alias,
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// thus no error from ParseInt is handled here.
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if v, e := strconv.ParseInt(f.Value.String(), 10, 32); e == nil {
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// https://github.com/kubernetes/community/blob/master/contributors/devel/sig-instrumentation/logging.md
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// klog.V(5) - Trace level verbosity
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if v > 4 {
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msg = fmt.Sprintf("%+v", err)
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}
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}
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}
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}
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switch err.(type) {
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case nil:
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return
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case preflightError:
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handleErr(msg, PreFlightExitCode)
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case errorsutil.Aggregate:
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handleErr(msg, ValidationExitCode)
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default:
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handleErr(msg, DefaultErrorExitCode)
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}
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}
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// FormatErrMsg returns a human-readable string describing the slice of errors passed to the function
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func FormatErrMsg(errs []error) string {
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var errMsg string
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for _, err := range errs {
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errMsg = fmt.Sprintf("%s\t- %s\n", errMsg, err.Error())
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}
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return errMsg
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}
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