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// Copyright 2016 Google Inc. All Rights Reserved.
// 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
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
Package logging contains a Stackdriver Logging client suitable for writing logs.
For reading logs, and working with sinks, metrics and monitored resources,
see package
This client uses Logging API v2.
See for an introduction to the API.
Note: This package is in beta. Some backwards-incompatible changes may occur.
Creating a Client
Use a Client to interact with the Stackdriver Logging API.
// Create a Client
ctx := context.Background()
client, err := logging.NewClient(ctx, "my-project")
if err != nil {
// TODO: Handle error.
Basic Usage
For most use-cases, you'll want to add log entries to a buffer to be periodically
flushed (automatically and asynchronously) to the Stackdriver Logging service.
// Initialize a logger
lg := client.Logger("my-log")
// Add entry to log buffer
lg.Log(logging.Entry{Payload: "something happened!"})
Closing your Client
You should call Client.Close before your program exits to flush any buffered log entries to the Stackdriver Logging service.
// Close the client when finished.
err = client.Close()
if err != nil {
// TODO: Handle error.
Synchronous Logging
For critical errors, you may want to send your log entries immediately.
LogSync is slow and will block until the log entry has been sent, so it is
not recommended for basic use.
lg.LogSync(ctx, logging.Entry{Payload: "ALERT! Something critical happened!"})
The Standard Logger Interface
You may want use a standard log.Logger in your program.
// stdlg implements log.Logger
stdlg := lg.StandardLogger(logging.Info)
stdlg.Println("some info")
Log Levels
An Entry may have one of a number of severity levels associated with it.
Payload: "something terrible happened!",
Severity: logging.Critical,
package logging // import ""