pulsar-client-go
库。go get -u "github.com/apache/pulsar-client-go/pulsar"
import "github.com/apache/pulsar-client-go/pulsar"
// 创建pulsar客户端client, err := pulsar.NewClient(pulsar.ClientOptions{// 服务接入地址URL: serviceUrl,// 授权角色密钥Authentication: pulsar.NewAuthenticationToken(authentication),OperationTimeout: 30 * time.Second,ConnectionTimeout: 30 * time.Second,})if err != nil {log.Fatalf("Could not instantiate Pulsar client: %v", err)}defer client.Close()
// 使用客户端创建生产者producer, err := client.CreateProducer(pulsar.ProducerOptions{// topic完整路径,格式为persistent://集群(租户)ID/命名空间/Topic名称Topic: "persistent://pulsar-mmqwr5xx9n7g/sdk_go/topic1",})if err != nil {log.Fatal(err)}defer producer.Close()
persistent://clusterid/namespace/Topic
,clusterid/namespace/topic
的部分可以从控制台上 Topic管理 页面直接复制。// 发送消息_, err = producer.Send(context.Background(), &pulsar.ProducerMessage{// 消息内容Payload: []byte("hello go client, this is a message."),// 业务keyKey: "yourKey",// 业务参数Properties: map[string]string{"key": "value"},})
// 使用客户端创建消费者consumer, err := client.Subscribe(pulsar.ConsumerOptions{// topic完整路径,格式为persistent://集群(租户)ID/命名空间/Topic名称Topic: "persistent://pulsar-mmqwr5xx9n7g/sdk_go/topic1",// 订阅名称SubscriptionName: "topic1_sub",// 订阅模式Type: pulsar.Shared,})if err != nil {log.Fatal(err)}defer consumer.Close()
persistent://clusterid/namespace/Topic
,clusterid/namespace/topic
的部分可以从控制台上 Topic管理 页面直接复制。
// 获取消息msg, err := consumer.Receive(context.Background())if err != nil {log.Fatal(err)}// 模拟业务处理fmt.Printf("Received message msgId: %#v -- content: '%s'\\n",msg.ID(), string(msg.Payload()))// 消费成功,回复ack,消费失败根据业务需要选择回复nack或ReconsumeLaterconsumer.Ack(msg)
// It's recommended to make this a global instance called `log`.func New() *Logger {return &Logger{Out: os.Stderr, // 默认输出Formatter: new(TextFormatter),Hooks: make(LevelHooks),Level: InfoLevel,ExitFunc: os.Exit,ReportCaller: false,}}
os.Stderr
,如果用户没有自定义日志 lib 的话,Go SDK 的日志就会和业务日志混淆到一起,增加了问题定位的难度。// ClientOptions is used to construct a Pulsar Client instance.type ClientOptions struct {// Configure the logger used by the client.// By default, a wrapped logrus.StandardLogger will be used, namely,// log.NewLoggerWithLogrus(logrus.StandardLogger())// FIXME: use `logger` as internal field name instead of `log` as it's more idiomaticLogger log.Logger}
logger
接口的形式,自定义 log lib
,来达到将日志重定向到指定位置的目的。下面以 logrus
为例,自定义一个 log lib
,将 Go SDK 的日志输出到指定文件:package mainimport ("fmt""io""os""github.com/apache/pulsar-client-go/pulsar/log""github.com/sirupsen/logrus")// logrusWrapper implements Logger interface// based on underlying logrus.FieldLoggertype logrusWrapper struct {l logrus.FieldLogger}// NewLoggerWithLogrus creates a new logger which wraps// the given logrus.Loggerfunc NewLoggerWithLogrus(logger *logrus.Logger, outputPath string) log.Logger {writer1 := os.Stdoutwriter2, err := os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE, 0755)if err != nil {logrus.Error("create file log.txt failed: %v", err)}logger.SetOutput(io.MultiWriter(writer1, writer2))return &logrusWrapper{l: logger,}}func (l *logrusWrapper) SubLogger(fs log.Fields) log.Logger {return &logrusWrapper{l: l.l.WithFields(logrus.Fields(fs)),}}func (l *logrusWrapper) WithFields(fs log.Fields) log.Entry {return logrusEntry{e: l.l.WithFields(logrus.Fields(fs)),}}func (l *logrusWrapper) WithField(name string, value interface{}) log.Entry {return logrusEntry{e: l.l.WithField(name, value),}}func (l *logrusWrapper) WithError(err error) log.Entry {return logrusEntry{e: l.l.WithError(err),}}func (l *logrusWrapper) Debug(args ...interface{}) {l.l.Debug(args...)}func (l *logrusWrapper) Info(args ...interface{}) {l.l.Info(args...)}func (l *logrusWrapper) Warn(args ...interface{}) {l.l.Warn(args...)}func (l *logrusWrapper) Error(args ...interface{}) {l.l.Error(args...)}func (l *logrusWrapper) Debugf(format string, args ...interface{}) {l.l.Debugf(format, args...)}func (l *logrusWrapper) Infof(format string, args ...interface{}) {l.l.Infof(format, args...)}func (l *logrusWrapper) Warnf(format string, args ...interface{}) {l.l.Warnf(format, args...)}func (l *logrusWrapper) Errorf(format string, args ...interface{}) {l.l.Errorf(format, args...)}type logrusEntry struct {e logrus.FieldLogger}func (l logrusEntry) WithFields(fs log.Fields) log.Entry {return logrusEntry{e: l.e.WithFields(logrus.Fields(fs)),}}func (l logrusEntry) WithField(name string, value interface{}) log.Entry {return logrusEntry{e: l.e.WithField(name, value),}}func (l logrusEntry) Debug(args ...interface{}) {l.e.Debug(args...)}func (l logrusEntry) Info(args ...interface{}) {l.e.Info(args...)}func (l logrusEntry) Warn(args ...interface{}) {l.e.Warn(args...)}func (l logrusEntry) Error(args ...interface{}) {l.e.Error(args...)}func (l logrusEntry) Debugf(format string, args ...interface{}) {l.e.Debugf(format, args...)}func (l logrusEntry) Infof(format string, args ...interface{}) {l.e.Infof(format, args...)}func (l logrusEntry) Warnf(format string, args ...interface{}) {l.e.Warnf(format, args...)}func (l logrusEntry) Errorf(format string, args ...interface{}) {l.e.Errorf(format, args...)}
client, err := pulsar.NewClient(pulsar.ClientOptions{URL: "pulsar://localhost:6650",Logger: NewLoggerWithLogrus(log.StandardLogger(), "test.log"),})
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