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command_mq_topic_desc.go
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/
command_mq_topic_desc.go
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package shell
import (
"context"
"flag"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
"io"
)
func init() {
Commands = append(Commands, &commandMqTopicDescribe{})
}
type commandMqTopicDescribe struct {
}
func (c *commandMqTopicDescribe) Name() string {
return "mq.topic.describe"
}
func (c *commandMqTopicDescribe) Help() string {
return `describe a topic`
}
func (c *commandMqTopicDescribe) Do(args []string, commandEnv *CommandEnv, writer io.Writer) error {
// parse parameters
mqCommand := flag.NewFlagSet(c.Name(), flag.ContinueOnError)
namespace := mqCommand.String("namespace", "", "namespace name")
topicName := mqCommand.String("topic", "", "topic name")
if err := mqCommand.Parse(args); err != nil {
return err
}
// find the broker balancer
brokerBalancer, err := findBrokerBalancer(commandEnv)
if err != nil {
return err
}
fmt.Fprintf(writer, "current balancer: %s\n", brokerBalancer)
return pb.WithBrokerGrpcClient(false, brokerBalancer, commandEnv.option.GrpcDialOption, func(client mq_pb.SeaweedMessagingClient) error {
resp, err := client.LookupTopicBrokers(context.Background(), &mq_pb.LookupTopicBrokersRequest{
Topic: &mq_pb.Topic{
Namespace: *namespace,
Name: *topicName,
},
})
if err != nil {
return err
}
for _, assignment := range resp.BrokerPartitionAssignments {
fmt.Fprintf(writer, " %+v\n", assignment)
}
return nil
})
}