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log.go
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log.go
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// Copyright © 2017 Heptio
// 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 log provides an interface for a generic logging solution for Go projects.
package log
// A Logger represents the ability to log informational and error messages.
type Logger interface {
// All Loggers implement InfoLogger. Calling InfoLogger methods directly on
// a Logger value is equivalent to calling them on a V(1) InfoLogger. For
// example, logger.Info() produces the same result as logger.V(1).Info.
InfoLogger
// Error logs an error message. This is behaviorally akin to fmt.Println.
Error(args ...interface{})
// Errorf logs a formatted error message.
Errorf(format string, args ...interface{})
// V returns an InfoLogger value for a specific verbosity level. A higher
// verbosity level means a log message is less important.
V(level int) InfoLogger
// NewWithPrefix returns a Logger which prefixes all messages.
WithPrefix(prefix string) Logger
}
// An InfoLogger represents the ability to log informational messages.
type InfoLogger interface {
// Infof logs a formatted non-error message.
Infof(format string, args ...interface{})
}