/
assertions.go
42 lines (35 loc) · 1.12 KB
/
assertions.go
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package entrypoint
import (
"fmt"
"os"
"github.com/urfave/cli/v2"
)
type RequiredArgsError struct {
message string
}
func (err RequiredArgsError) Error() string {
return err.message
}
func NewRequiredArgsError(message string) error {
return &RequiredArgsError{message}
}
// StringFlagRequiredE checks if a required string flag is passed in on the CLI. This will return the set string, or an
// error if the flag is not passed in.
func StringFlagRequiredE(cliContext *cli.Context, flagName string) (string, error) {
value := cliContext.String(flagName)
if value == "" {
message := fmt.Sprintf("--%s is required", flagName)
return "", NewRequiredArgsError(message)
}
return value, nil
}
// EnvironmentVarRequiredE checks if a required environment variable is set. This will return the environment variable
// value, or an error if the environment variable is not set.
func EnvironmentVarRequiredE(varName string) (string, error) {
value := os.Getenv(varName)
if value == "" {
message := fmt.Sprintf("The environment variable %s is required to be set", varName)
return "", NewRequiredArgsError(message)
}
return value, nil
}