logging

package
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 Go to latest Published: Dec 17, 2019 License: Apache-2.0 Imports: 13 Imported by: 0

Documentation

Overview

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

(C) Copyright 2019 Intel Corporation.

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.

GOVERNMENT LICENSE RIGHTS-OPEN SOURCE SOFTWARE The Government's rights to use, modify, reproduce, release, perform, display, or disclose this software are subject to the terms of the Apache License as provided in Contract No. 8F-30005. Any reproduction of computer software, computer software documentation, or portions thereof marked with this legend must also reproduce the markings.

Index

Constants

View Source 
const (
	DefaultLogLevel = LogLevelInfo
)

Variables

This section is empty.

Functions

func MustCreateSyslogger 

func MustCreateSyslogger(prio syslog.Priority, flags int) *log.Logger

MustCreateSyslogger attempts to create a *log.Logger configured for output to the system log daemon. If it fails, it will panic.

func NewTestLogger 

func NewTestLogger(prefix string) (*LeveledLogger, *LogBuffer)

NewTestLogger returns a logger and a *LogBuffer, with the logger configured to send all output into the buffer. The logger's level is set to DEBUG by default.

Types

type DebugLogger 

type DebugLogger interface {
	Debugf(format string, args ...interface{})
}

DebugLogger defines an interface to be implemented by Debug loggers.

type DefaultDebugLogger 

type DefaultDebugLogger struct {
	// contains filtered or unexported fields
}

DefaultDebugLogger implements the DebugLogger interface.

func NewDebugLogger 

func NewDebugLogger(dest io.Writer) *DefaultDebugLogger

NewDebugLogger returns a DebugLogger configured for outputting debugging messages.

func (*DefaultDebugLogger) Debugf 

func (l *DefaultDebugLogger) Debugf(format string, args ...interface{})

Debugf emits a formatted debug message.

func (*DefaultDebugLogger) WithJSONOutput 

func (l *DefaultDebugLogger) WithJSONOutput() DebugLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultDebugLogger) WithSyslogOutput 

func (l *DefaultDebugLogger) WithSyslogOutput() DebugLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultErrorLogger 

type DefaultErrorLogger struct {
	// contains filtered or unexported fields
}

DefaultErrorLogger implements the ErrorLogger interface.

func NewCommandLineErrorLogger 

func NewCommandLineErrorLogger(output io.Writer) *DefaultErrorLogger

NewCommandLineErrorLogger returns an ErrorLogger configured for outputting unadorned error messages (i.e. no timestamps, source info, etc); typically used for CLI utility logging.

func NewErrorLogger 

func NewErrorLogger(prefix string, output io.Writer) *DefaultErrorLogger

NewErrorLogger returns an ErrorLogger configured for outputting error messages with standard formatting (e.g. to stderr, logfile, etc.)

func (*DefaultErrorLogger) Errorf 

func (l *DefaultErrorLogger) Errorf(format string, args ...interface{})

Errorf emits a formatted error message.

func (*DefaultErrorLogger) WithJSONOutput 

func (l *DefaultErrorLogger) WithJSONOutput() ErrorLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultErrorLogger) WithSyslogOutput 

func (l *DefaultErrorLogger) WithSyslogOutput() ErrorLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type DefaultInfoLogger 

type DefaultInfoLogger struct {
	// contains filtered or unexported fields
}

DefaultInfoLogger implements the InfoLogger interface.

func NewCommandLineInfoLogger 

func NewCommandLineInfoLogger(output io.Writer) *DefaultInfoLogger

NewCommandLineInfoLogger returns an InfoLogger configured for outputting unadorned informational messages (i.e. no timestamps, source info, etc); typically used for CLI utility logging.

func NewInfoLogger 

func NewInfoLogger(prefix string, output io.Writer) *DefaultInfoLogger

NewInfoLogger returns an InfoLogger configured for outputting informational messages with standard formatting (e.g. to stderr, logfile, etc.)

func (*DefaultInfoLogger) Infof 

func (l *DefaultInfoLogger) Infof(format string, args ...interface{})

Infof emits a formatted informational message.

func (*DefaultInfoLogger) WithJSONOutput 

func (l *DefaultInfoLogger) WithJSONOutput() InfoLogger

WithJSONOutput switches the logger's output to use structured JSON formatting.

func (*DefaultInfoLogger) WithSyslogOutput 

func (l *DefaultInfoLogger) WithSyslogOutput() InfoLogger

WithSyslogOutput switches the logger's output to emit messages via the system logging service.

type ErrorLogger 

type ErrorLogger interface {
	Errorf(format string, args ...interface{})
}

ErrorLogger defines an interface to be implemented by Error loggers.

type InfoLogger 

type InfoLogger interface {
	Infof(format string, args ...interface{})
}

InfoLogger defines an interface to be implemented by Info loggers.

type JSONFormatter 

type JSONFormatter struct {
	// contains filtered or unexported fields
}

JSONFormatter emits JSON-formatted log output

func NewJSONFormatter 

func NewJSONFormatter(output io.Writer, level, extraData string, flags int) *JSONFormatter

NewJSONFormatter returns a *JSONFormatter configured to emit JSON-formatted output.

func (*JSONFormatter) Output 

func (f *JSONFormatter) Output(callDepth int, msg string) error

Output emulates log.Logger's Output(), but formats the message as a JSON-structured log entry.

type LeveledLogger 

type LeveledLogger struct {
	sync.RWMutex
	// contains filtered or unexported fields
}

LeveledLogger provides a logging implementation which can emit log messages to multiple destinations with different output formats.

func NewCombinedLogger 

func NewCombinedLogger(prefix string, output io.Writer) *LeveledLogger

NewCombinedLogger returns a logger configured to send all output to the supplied io.Writer.

func NewCommandLineLogger 

func NewCommandLineLogger() *LeveledLogger

NewCommandLineLogger returns a logger configured to send non-error output to stdout and error output to stderr. The output format is suitable for command line utilities which don't want output to include timestamps and filenames.

func NewStdoutLogger 

func NewStdoutLogger(prefix string) *LeveledLogger

NewStdoutLogger returns a logger configured to send all output to stdout (suitable for containerized/systemd operation).

func (*LeveledLogger) AddDebugLogger 

func (ll *LeveledLogger) AddDebugLogger(newLogger DebugLogger)

AddDebugLogger adds the specified Debug logger to the logger.

func (*LeveledLogger) AddErrorLogger 

func (ll *LeveledLogger) AddErrorLogger(newLogger ErrorLogger)

AddErrorLogger adds the specified Error logger to the logger.

func (*LeveledLogger) AddInfoLogger 

func (ll *LeveledLogger) AddInfoLogger(newLogger InfoLogger)

AddInfoLogger adds the specified Info logger to the logger.

func (*LeveledLogger) Debug 

func (ll *LeveledLogger) Debug(msg string)

Debug emits an unformatted message at Debug level, if the logger is configured to do so.

func (*LeveledLogger) Debugf 

func (ll *LeveledLogger) Debugf(format string, args ...interface{})

Debugf emits a formatted message at Debug level, if the logger is configured to do so.

func (*LeveledLogger) Error 

func (ll *LeveledLogger) Error(msg string)

Error emits an unformatted message at Error level, if the logger is configured to do so.

func (*LeveledLogger) Errorf 

func (ll *LeveledLogger) Errorf(format string, args ...interface{})

Errorf emits a formatted message at Error level, if the logger is configured to do so.

func (*LeveledLogger) Info 

func (ll *LeveledLogger) Info(msg string)

Info emits an unformatted message at Info level, if the logger is configured to do so.

func (*LeveledLogger) Infof 

func (ll *LeveledLogger) Infof(format string, args ...interface{})

Infof emits a formatted message at Info level, if the logger is configured to do so.

func (*LeveledLogger) Level 

func (ll *LeveledLogger) Level() LogLevel

Level returns the logger's current LogLevel.

func (*LeveledLogger) SetLevel 

func (ll *LeveledLogger) SetLevel(newLevel LogLevel)

SetLevel sets the logger's LogLevel, at or above which messages will be emitted.

func (*LeveledLogger) WithDebugLogger 

func (ll *LeveledLogger) WithDebugLogger(newLogger DebugLogger) *LeveledLogger

WithDebugLogger adds the specified Debug logger to the logger as part of a chained method call.

func (*LeveledLogger) WithErrorLogger 

func (ll *LeveledLogger) WithErrorLogger(newLogger ErrorLogger) *LeveledLogger

WithErrorLogger adds the specified Error logger to the logger as part of a chained method call.

func (*LeveledLogger) WithInfoLogger 

func (ll *LeveledLogger) WithInfoLogger(newLogger InfoLogger) *LeveledLogger

WithInfoLogger adds the specified Info logger to the logger as part of a chained method call.

func (*LeveledLogger) WithJSONOutput 

func (ll *LeveledLogger) WithJSONOutput() *LeveledLogger

WithJSONOutput is a convenience method to set all logging outputs to the JSON formatter.

func (*LeveledLogger) WithLogLevel 

func (ll *LeveledLogger) WithLogLevel(level LogLevel) *LeveledLogger

WithLogLevel allows the logger's LogLevel to be set as part of a chained method call.

func (*LeveledLogger) WithSyslogOutput 

func (ll *LeveledLogger) WithSyslogOutput() *LeveledLogger

WithSyslogOutput is a convenience method to set all logging outputs to the Syslog formatter.

type LogBuffer 

type LogBuffer struct {
	sync.Mutex
	// contains filtered or unexported fields
}

LogBuffer provides a thread-safe wrapper for bytes.Buffer. It only wraps a subset of bytes.Buffer's methods; just enough to implement io.Reader, io.Writer, and fmt.Stringer. The Reset() method is also wrapped in order to make it useful for testing.

func (*LogBuffer) Read 

func (lb *LogBuffer) Read(p []byte) (int, error)

func (*LogBuffer) Reset 

func (lb *LogBuffer) Reset()

func (*LogBuffer) String 

func (lb *LogBuffer) String() string

func (*LogBuffer) Write 

func (lb *LogBuffer) Write(p []byte) (int, error)

type LogLevel 

type LogLevel int32

LogLevel represents the level at which the logger will emit log messages 

const (
	// LogLevelDisabled disables any logging output
	LogLevelDisabled LogLevel = iota
	// LogLevelError emits messages at ERROR or higher
	LogLevelError
	// LogLevelInfo emits messages at INFO or higher
	LogLevelInfo
	// LogLevelDebug emits messages at DEBUG or higher
	LogLevelDebug
)

func (*LogLevel) Get 

func (ll *LogLevel) Get() LogLevel

Get returns the current log level

func (*LogLevel) Set 

func (ll *LogLevel) Set(newLevel LogLevel)

Set safely sets the log level to the supplied level

func (*LogLevel) SetString 

func (ll *LogLevel) SetString(in string) error

SetString sets the log level from the supplied string.

func (LogLevel) String 

func (ll LogLevel) String() string

type Logger 

type Logger interface {
	DebugLogger
	Debug(msg string)
	InfoLogger
	Info(msg string)
	ErrorLogger
	Error(msg string)
}

Logger defines a standard logging interface

type Outputter 

type Outputter interface {
	Output(callDepth int, msg string) error
}

Outputter defines an interface to be implemented by output formatters.

Source Files

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