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

//! Implementation of the `clickhouse` sink.

use super::{config::Format, request_builder::ClickhouseRequestBuilder};
use crate::sinks::{prelude::*, util::http::HttpRequest};

pub struct ClickhouseSink<S> {
    batch_settings: BatcherSettings,
    service: S,
    database: Template,
    table: Template,
    format: Format,
    request_builder: ClickhouseRequestBuilder,
}

impl<S> ClickhouseSink<S>
where
    S: Service<HttpRequest<PartitionKey>> + Send + 'static,
    S::Future: Send + 'static,
    S::Response: DriverResponse + Send + 'static,
    S::Error: std::fmt::Debug + Into<crate::Error> + Send,
{
    pub const fn new(
        batch_settings: BatcherSettings,
        service: S,
        database: Template,
        table: Template,
        format: Format,
        request_builder: ClickhouseRequestBuilder,
    ) -> Self {
        Self {
            batch_settings,
            service,
            database,
            table,
            format,
            request_builder,
        }
    }

    async fn run_inner(self: Box<Self>, input: BoxStream<'_, Event>) -> Result<(), ()> {
        let batch_settings = self.batch_settings;

        input
            .batched_partitioned(
                KeyPartitioner::new(self.database, self.table, self.format),
                || batch_settings.as_byte_size_config(),
            )
            .filter_map(|(key, batch)| async move { key.map(move |k| (k, batch)) })
            .request_builder(
                default_request_builder_concurrency_limit(),
                self.request_builder,
            )
            .filter_map(|request| async {
                match request {
                    Err(error) => {
                        emit!(SinkRequestBuildError { error });
                        None
                    }
                    Ok(req) => Some(req),
                }
            })
            .into_driver(self.service)
            .run()
            .await
    }
}

#[async_trait::async_trait]
impl<S> StreamSink<Event> for ClickhouseSink<S>
where
    S: Service<HttpRequest<PartitionKey>> + Send + 'static,
    S::Future: Send + 'static,
    S::Response: DriverResponse + Send + 'static,
    S::Error: std::fmt::Debug + Into<crate::Error> + Send,
{
    async fn run(
        self: Box<Self>,
        input: futures_util::stream::BoxStream<'_, Event>,
    ) -> Result<(), ()> {
        self.run_inner(input).await
    }
}

/// PartitionKey used to partition events by (database, table) pair.
#[derive(Hash, Eq, PartialEq, Clone, Debug)]
pub(super) struct PartitionKey {
    pub database: String,
    pub table: String,
    pub format: Format,
}

/// KeyPartitioner that partitions events by (database, table) pair.
struct KeyPartitioner {
    database: Template,
    table: Template,
    format: Format,
}

impl KeyPartitioner {
    const fn new(database: Template, table: Template, format: Format) -> Self {
        Self {
            database,
            table,
            format,
        }
    }

    fn render(template: &Template, item: &Event, field: &'static str) -> Option<String> {
        template
            .render_string(item)
            .map_err(|error| {
                emit!(TemplateRenderingError {
                    error,
                    field: Some(field),
                    drop_event: true,
                });
            })
            .ok()
    }
}

impl Partitioner for KeyPartitioner {
    type Item = Event;
    type Key = Option<PartitionKey>;

    fn partition(&self, item: &Self::Item) -> Self::Key {
        let database = Self::render(&self.database, item, "database_key")?;
        let table = Self::render(&self.table, item, "table_key")?;
        Some(PartitionKey {
            database,
            table,
            format: self.format,
        })
    }
}