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