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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
}