Stackdriver Logging Client Libraries

This page shows how to get started with the new Cloud Client Libraries for the Stackdriver Logging API. Read more about the client libraries for Cloud APIs, including the older Google APIs Client Libraries, in Client Libraries Explained.

Installing the client library

C#

Install-Package Google.Cloud.Logging.V2

Go

go get -u cloud.google.com/go/logging

Java

If you are using Maven, add this to your pom.xml file:

<dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-logging</artifactId>
    <version>1.2.1</version>
</dependency>

If you are using Gradle, add this to your dependencies:

compile group: 'com.google.cloud', name: 'google-cloud-logging', version: '1.2.1'

Node.js

npm install --save @google-cloud/logging

PHP

composer require google/cloud

Python

pip install --upgrade google-cloud-logging

Ruby

gem install google-cloud-logging

Using the client library

The following example shows how to use the client library. To run it on your local workstation you must first install the Google Cloud SDK and authenticate by running the following command:

gcloud auth application-default login

For information about authenticating in other environments, see setting up authentication for server to server production applications.

C#

using System;
// Imports the Google Cloud Logging client library
using Google.Cloud.Logging.V2;
using Google.Cloud.Logging.Type;
using System.Collections.Generic;
using Google.Api;

namespace GoogleCloudSamples
{
    public class QuickStart
    {
        static void Main(string[] args)
        {
            // Your Google Cloud Platform project ID.
            string projectId = "YOUR-PROJECT-ID";

            // Instantiates a client.
            var client = LoggingServiceV2Client.Create();

            // Prepare new log entry.
            LogEntry logEntry = new LogEntry();
            string logId = "my-log";
            LogName logName = new LogName(projectId, logId);
            LogNameOneof logNameToWrite = LogNameOneof.From(logName);
            logEntry.LogName = logName.ToString();
            logEntry.Severity = LogSeverity.Info;

            // Create log entry message.
            string message = "Hello World!";
            string messageId = DateTime.Now.Millisecond.ToString();
            Type myType = typeof(QuickStart);
            string entrySeverity = logEntry.Severity.ToString().ToUpper();
            logEntry.TextPayload =
                $"{messageId} {entrySeverity} {myType.Namespace}.LoggingSample - {message}";

            // Set the resource type to control which GCP resource the log entry belongs to.
            // See the list of resource types at:
            // https://cloud.google.com/logging/docs/api/v2/resource-list
            // This sample uses resource type 'global' causing log entries to appear in the 
            // "Global" resource list of the Developers Console Logs Viewer:
            //  https://console.cloud.google.com/logs/viewer
            MonitoredResource resource = new MonitoredResource();
            resource.Type = "global";

            // Create dictionary object to add custom labels to the log entry.
            IDictionary<string, string> entryLabels = new Dictionary<string, string>();
            entryLabels.Add("size", "large");
            entryLabels.Add("color", "red");

            // Add log entry to collection for writing. Multiple log entries can be added.
            IEnumerable<LogEntry> logEntries = new LogEntry[] { logEntry };

            // Write new log entry.
            client.WriteLogEntries(logNameToWrite, resource, entryLabels, logEntries);

            Console.WriteLine("Log Entry created.");
        }
    }
}
Read more in the C# API Reference Documentation for the Stackdriver Logging API Client Library.

Go

// Sample logging-quickstart writes a log entry to Stackdriver Logging.
package main

import (
	"fmt"
	"log"

	// Imports the Stackdriver Logging client package.
	"cloud.google.com/go/logging"
	"golang.org/x/net/context"
)

func main() {
	ctx := context.Background()

	// Sets your Google Cloud Platform project ID.
	projectID := "YOUR_PROJECT_ID"

	// Creates a client.
	client, err := logging.NewClient(ctx, projectID)
	if err != nil {
		log.Fatalf("Failed to create client: %v", err)
	}

	// Sets the name of the log to write to.
	logName := "my-log"

	// Selects the log to write to.
	logger := client.Logger(logName)

	// Sets the data to log.
	text := "Hello, world!"

	// Adds an entry to the log buffer.
	logger.Log(logging.Entry{Payload: text})

	// Closes the client and flushes the buffer to the Stackdriver Logging
	// service.
	if err := client.Close(); err != nil {
		log.Fatalf("Failed to close client: %v", err)
	}

	fmt.Printf("Logged: %v\n", text)
}
Read more in the Go API Reference Documentation for the Stackdriver Logging API Client Library.

Java

// Imports the Google Cloud client library

import com.google.cloud.MonitoredResource;
import com.google.cloud.logging.LogEntry;
import com.google.cloud.logging.Logging;
import com.google.cloud.logging.LoggingOptions;
import com.google.cloud.logging.Payload.StringPayload;

import java.util.Collections;

public class QuickstartSample {

  public static void main(String... args) throws Exception {
    // Instantiates a client
    Logging logging = LoggingOptions.getDefaultInstance().getService();

    // The name of the log to write to
    String logName = args[0];  // "my-log";

    // The data to write to the log
    String text = "Hello, world!";

    LogEntry entry = LogEntry.newBuilder(StringPayload.of(text))
        .setLogName(logName)
        .setResource(MonitoredResource.newBuilder("global").build())
        .build();

    // Writes the log entry
    logging.write(Collections.singleton(entry));

    System.out.printf("Logged: %s%n", text);
  }
}
Read more in the Java API Reference Documentation for the Stackdriver Logging API Client Library.

Node.js

// Imports the Google Cloud client library
const Logging = require('@google-cloud/logging');

// Your Google Cloud Platform project ID
const projectId = 'YOUR_PROJECT_ID';

// Instantiates a client
const logging = Logging({
  projectId: projectId
});

// The name of the log to write to
const logName = 'my-log';
// Selects the log to write to
const log = logging.log(logName);

// The data to write to the log
const text = 'Hello, world!';
// The metadata associated with the entry
const metadata = { resource: { type: 'global' } };
// Prepares a log entry
const entry = log.entry(metadata, text);

// Writes the log entry
log.write(entry)
  .then(() => {
    console.log(`Logged: ${text}`);
  })
  .catch((err) => {
    console.error('ERROR:', err);
  });
Read more in the Node.js API Reference Documentation for the Stackdriver Logging API Client Library.

PHP

# Includes the autoloader for libraries installed with composer
require __DIR__ . '/vendor/autoload.php';

# Imports the Google Cloud client library
use Google\Cloud\Logging\LoggingClient;

# Your Google Cloud Platform project ID
$projectId = 'YOUR_PROJECT_ID';

# Instantiates a client
$logging = new LoggingClient([
    'projectId' => $projectId
]);

# The name of the log to write to
$logName = 'my-log';

# Selects the log to write to
$logger = $logging->logger($logName);

# The data to log
$text = 'Hello, world!';

# Creates the log entry
$entry = $logger->entry($text);

# Writes the log entry
$logger->write($entry);

echo 'Logged ' . $text;
Read more in the PHP API Reference Documentation for the Stackdriver Logging API Client Library.

Python

# Imports the Google Cloud client library
from google.cloud import logging

# Instantiates a client
logging_client = logging.Client()

# The name of the log to write to
log_name = 'my-log'
# Selects the log to write to
logger = logging_client.logger(log_name)

# The data to log
text = 'Hello, world!'

# Writes the log entry
logger.log_text(text)

print('Logged: {}'.format(text))
Read more in the Python API Reference Documentation for the Stackdriver Logging API Client Library.

Ruby

# Imports the Google Cloud client library
require "google/cloud/logging"

# Your Google Cloud Platform project ID
project_id = "YOUR_PROJECT_ID"

# Instantiates a client
logging = Google::Cloud::Logging.new project: project_id

# Prepares a log entry
entry = logging.entry
# The data to log
entry.payload = "Hello, world!"
# The name of the log to write to
entry.log_name = "my-log"
# The resource associated with the data
entry.resource.type = "global"

# Writes the log entry
logging.write_entries entry

puts "Logged #{entry.payload}"
Read more in the Ruby API Reference Documentation for the Stackdriver Logging API Client Library.

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