package flags import ( "fmt" "strings" "github.com/pkg/errors" "github.com/tendermint/tendermint/libs/log" ) const ( defaultLogLevelKey = "*" ) // ParseLogLevel parses complex log level - comma-separated // list of module:level pairs with an optional *:level pair (* means // all other modules). // // Example: // ParseLogLevel("consensus:debug,mempool:debug,*:error", log.NewTMLogger(os.Stdout), "info") func ParseLogLevel(lvl string, logger log.Logger, defaultLogLevelValue string) (log.Logger, error) { if lvl == "" { return nil, errors.New("empty log level") } l := lvl // prefix simple one word levels (e.g. "info") with "*" if !strings.Contains(l, ":") { l = defaultLogLevelKey + ":" + l } options := make([]log.Option, 0) isDefaultLogLevelSet := false var option log.Option var err error list := strings.Split(l, ",") for _, item := range list { moduleAndLevel := strings.Split(item, ":") if len(moduleAndLevel) != 2 { return nil, fmt.Errorf("expected list in a form of \"module:level\" pairs, given pair %s, list %s", item, list) } module := moduleAndLevel[0] level := moduleAndLevel[1] if module == defaultLogLevelKey { option, err = log.AllowLevel(level) if err != nil { return nil, errors.Wrap(err, fmt.Sprintf("Failed to parse default log level (pair %s, list %s)", item, l)) } options = append(options, option) isDefaultLogLevelSet = true } else { switch level { case "debug": option = log.AllowDebugWith("module", module) case "info": option = log.AllowInfoWith("module", module) case "error": option = log.AllowErrorWith("module", module) case "none": option = log.AllowNoneWith("module", module) default: return nil, fmt.Errorf("expected either \"info\", \"debug\", \"error\" or \"none\" log level, given %s (pair %s, list %s)", level, item, list) } options = append(options, option) } } // if "*" is not provided, set default global level if !isDefaultLogLevelSet { option, err = log.AllowLevel(defaultLogLevelValue) if err != nil { return nil, err } options = append(options, option) } return log.NewFilter(logger, options...), nil }