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logging.go
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logging.go
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// Copyright © 2020 Weald Technology Trading.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"os"
"github.com/pkg/errors"
"github.com/rs/zerolog"
zerologger "github.com/rs/zerolog/log"
"github.com/spf13/viper"
"github.com/wealdtech/chaind/util"
)
// log.
var log zerolog.Logger
// initLogging initialises logging.
func initLogging() error {
// We set the global logging level to trace, because if the global log level is higher than the
// local log level the local level is ignored. It is then overridden for each module.
zerolog.SetGlobalLevel(zerolog.TraceLevel)
// Change the output file.
if viper.GetString("log-file") != "" {
f, err := os.OpenFile(resolvePath(viper.GetString("log-file")), os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0o600)
if err != nil {
return errors.Wrap(err, "failed to open log file")
}
zerologger.Logger = zerologger.Logger.Output(f)
}
// Set the local logger from the global logger.
log = zerologger.Logger.With().Logger().Level(util.LogLevel(""))
return nil
}