Logging – Kurzanleitung

Erläuterungen, wie man einen Logeintrag schreibt.

Dokumentationsseiten mit diesem Codebeispiel

Die folgenden Dokumente enthalten das Codebeispiel im Kontext:

Codebeispiel

C#

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.


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
    {
        public 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);
            logEntry.LogNameAsLogName = logName;
            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
            {
                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(logName, resource, entryLabels, logEntries);

            Console.WriteLine("Log Entry created.");
        }
    }
}

Go

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.


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

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/logging"
)

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 Cloud Logging
	// service.
	if err := client.Close(); err != nil {
		log.Fatalf("Failed to close client: %v", err)
	}

	fmt.Printf("Logged: %v\n", text)
}

Java

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.

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 com.google.cloud.logging.Severity;
import java.util.Collections;

/**
 * This sample demonstrates writing logs using the Cloud Logging API. The library also offers a
 * java.util.logging Handler `com.google.cloud.logging.LoggingHandler` Logback integration is also
 * available :
 * https://github.com/googleapis/google-cloud-java/tree/master/google-cloud-clients/google-cloud-contrib/google-cloud-logging-logback
 * Using the java.util.logging handler / Logback appender should be preferred to using the API
 * directly.
 */
public class QuickstartSample {

  /** Expects a new or existing Cloud log name as the first argument. */
  public static void main(String... args) throws Exception {
    // The name of the log to write to
    String logName = args[0]; // "my-log";
    String textPayload = "Hello, world!";

    // Instantiates a client
    try (Logging logging = LoggingOptions.getDefaultInstance().getService()) {

      LogEntry entry =
          LogEntry.newBuilder(StringPayload.of(textPayload))
              .setSeverity(Severity.ERROR)
              .setLogName(logName)
              .setResource(MonitoredResource.newBuilder("global").build())
              .build();

      // Writes the log entry asynchronously
      logging.write(Collections.singleton(entry));
    }
    System.out.printf("Logged: %s%n", textPayload);
  }
}

Node.js

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.

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

async function quickstart(
  projectId = 'YOUR_PROJECT_ID', // Your Google Cloud Platform project ID
  logName = 'my-log' // The name of the log to write to
) {
  // Creates a client
  const logging = new Logging({projectId});

  // 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'},
    // See: https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity
    severity: 'INFO',
  };

  // Prepares a log entry
  const entry = log.entry(metadata, text);

  async function writeLog() {
    // Writes the log entry
    await log.write(entry);
    console.log(`Logged: ${text}`);
  }
  writeLog();
}

PHP

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.

# 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
]);

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

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

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

echo 'Logged ' . $text;

Python

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.

# 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))

Ruby

Informationen zum Installieren und Verwenden der Clientbibliothek für Logging finden Sie unter Logging-Clientbibliotheken.

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

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

# Prepares a log entry
entry = logging.entry
# payload = "The data you want to log"
entry.payload = payload
# log_name = "The name of the log to write to"
entry.log_name = log_name
# The resource associated with the data
entry.resource.type = "global"

# Writes the log entry
logging.write_entries entry

puts "Logged #{entry.payload}"

Nächste Schritte

Informationen zum Suchen und Filtern von Codebeispielen für andere Google Cloud-Produkte finden Sie im Google Cloud-Beispielbrowser.