1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use crate::configuration::all::BOOTSTRAP_SERVERS;
use crate::wrap_err::KWResult;
use crate::wrap_metadata::{MetadataTopicWrap, MetadataWrap};
use crate::{KWConsumer, KWProducer};
use anyhow::anyhow;
use rdkafka::admin::{AdminClient, AdminOptions, NewTopic};
use rdkafka::client::DefaultClientContext;
use rdkafka::config::{FromClientConfig, RDKafkaLogLevel};
use rdkafka::error::RDKafkaErrorCode;
use rdkafka::util::Timeout;
use rdkafka::{ClientConfig, ClientContext};
use std::sync::Arc;
use std::time::Duration;

pub(crate) type SafeAdminClient = Arc<AdminClient<DefaultClientContext>>;

#[async_trait::async_trait]
pub trait OptionExt {
    type AdminClient: FromClientConfig;
    async fn create_topic<'a, I>(&self, topics: I) -> KWResult<()>
    where
        I: IntoIterator<Item = &'a NewTopic<'a>> + Send;

    fn create_admin_client(&self) -> KWResult<Self::AdminClient> {
        let admin_client = ClientConfig::new()
            .set(BOOTSTRAP_SERVERS, self.get_brokers())
            .set_log_level(self.get_log_level())
            .create()?;
        Ok(admin_client)
    }

    fn get_brokers(&self) -> &str;
    fn get_log_level(&self) -> RDKafkaLogLevel;

    async fn get_admin_client(&self) -> KWResult<SafeAdminClient>;

    async fn get_topics<C: ClientContext>(&self) -> KWResult<Vec<MetadataTopicWrap>> {
        let metadata: MetadataWrap = self
            .get_admin_client()
            .await?
            .inner()
            .fetch_metadata(None, Timeout::from(Duration::from_secs(5)))?
            .into();
        Ok(metadata.topics)
    }
}

#[async_trait::async_trait]
impl OptionExt for KWProducer {
    type AdminClient = AdminClient<DefaultClientContext>;

    async fn create_topic<'a, I>(&self, topics: I) -> KWResult<()>
    where
        I: IntoIterator<Item = &'a NewTopic<'a>> + Send,
    {
        let admin_client = self.get_admin_client().await?;

        let topics_result = admin_client
            .create_topics(topics, &AdminOptions::new())
            .await?;

        let mut err_msg = vec![];
        for ret in topics_result {
            match ret {
                Ok(_) => {}
                Err((topic, err_code)) => {
                    // topic already exists
                    if let RDKafkaErrorCode::TopicAlreadyExists = err_code {
                        warn!("create kafka topic {}: topic already exists", topic);
                    } else {
                        err_msg.push(format!("topic {} -> error code: {}", topic, err_code))
                    }
                }
            }
        }

        if err_msg.is_empty() {
            return Ok(());
        }
        Err(anyhow!("failed to create kafka:{}", err_msg.join(",")).into())
    }

    fn get_brokers(&self) -> &str {
        self.conf.brokers.as_str()
    }

    fn get_log_level(&self) -> RDKafkaLogLevel {
        self.conf.log_level.unwrap_or(RDKafkaLogLevel::Error)
    }

    async fn get_admin_client(&self) -> KWResult<SafeAdminClient> {
        let mut guard = self.admin_client.lock().await;
        if guard.is_none() {
            let client = self.create_admin_client()?;
            *guard = Some(Arc::new(client));
        }

        Ok(guard.clone().unwrap())
    }
}

#[async_trait::async_trait]
impl OptionExt for KWConsumer {
    type AdminClient = AdminClient<DefaultClientContext>;

    async fn create_topic<'a, I>(&self, topics: I) -> KWResult<()>
    where
        I: IntoIterator<Item = &'a NewTopic<'a>> + Send,
    {
        let admin_client = self.get_admin_client().await?;

        let topics_result = admin_client
            .create_topics(topics, &AdminOptions::new())
            .await?;

        let mut err_msg = vec![];
        for ret in topics_result {
            match ret {
                Ok(_) => {}
                Err((topic, err_code)) => {
                    // topic already exists
                    if let RDKafkaErrorCode::TopicAlreadyExists = err_code {
                        warn!("create kafka topic {}: topic already exists", topic);
                    } else {
                        err_msg.push(format!("topic {} -> error code: {}", topic, err_code))
                    }
                }
            }
        }

        if err_msg.is_empty() {
            return Ok(());
        }
        Err(anyhow!("failed to create kafka:{}", err_msg.join(",")).into())
    }

    fn get_brokers(&self) -> &str {
        self.conf.brokers.as_str()
    }

    fn get_log_level(&self) -> RDKafkaLogLevel {
        self.conf.log_level.unwrap_or(RDKafkaLogLevel::Error)
    }

    async fn get_admin_client(&self) -> KWResult<SafeAdminClient> {
        let mut guard = self.admin_client.lock().await;
        if guard.is_none() {
            let client = self.create_admin_client()?;
            *guard = Some(Arc::new(client));
        }

        Ok(guard.clone().unwrap())
    }
}