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lib/envflag: add -envflag.prefix for setting optional prefix for environment vars

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This commit is contained in:
Aliaksandr Valialkin 2020-03-30 15:51:19 +03:00
parent e6e321f542
commit b47444e69d
1 changed files with 8 additions and 4 deletions
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8
lib/envflag/envflag.go
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@ -7,9 +7,12 @@ import (
"strings"
)
var enable = flag.Bool("envflag.enable", false, "Whether to enable reading flags from environment variables additionally to command line. "+
var (
enable = flag.Bool("envflag.enable", false, "Whether to enable reading flags from environment variables additionally to command line. "+
"Command line flag values have priority over values from environment vars. "+
"Flags are read only from command line if this flag isn't set")
prefix = flag.String("envflag.prefix", "", "Prefix for environment variables if -envflag.enable is set")
)
// Parse parses environment vars and command-line flags.
//
@ -48,5 +51,6 @@ func Parse() {
func getEnvFlagName(s string) string {
// Substitute dots with underscores, since env var names cannot contain dots.
// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/311#issuecomment-586354129 for details.
return strings.ReplaceAll(s, ".", "_")
s = strings.ReplaceAll(s, ".", "_")
return *prefix + s
}