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 std::task::{Context, Poll};

use bytes::Bytes;
use http::StatusCode;
use snafu::Snafu;
use tracing::Instrument;

use crate::{
    http::{Auth, HttpClient},
    sinks::{prelude::*, util::UriSerde},
};

#[derive(Clone)]
pub struct LokiRetryLogic;

impl RetryLogic for LokiRetryLogic {
    type Error = LokiError;
    type Response = LokiResponse;

    fn is_retriable_error(&self, error: &Self::Error) -> bool {
        match error {
            LokiError::ServerError { code } => match *code {
                StatusCode::TOO_MANY_REQUESTS => true,
                StatusCode::NOT_IMPLEMENTED => false,
                _ if code.is_server_error() => true,
                _ => false,
            },
            LokiError::HttpError { .. } => true,
        }
    }
}

#[derive(Debug, Snafu)]
pub enum LokiError {
    #[snafu(display("Server responded with an error: {}", code))]
    ServerError { code: StatusCode },
    #[snafu(display("Failed to make HTTP(S) request: {}", error))]
    HttpError { error: crate::http::HttpError },
}

#[derive(Debug, Snafu)]
pub struct LokiResponse {
    metadata: RequestMetadata,
}

impl DriverResponse for LokiResponse {
    fn event_status(&self) -> EventStatus {
        EventStatus::Delivered
    }

    fn events_sent(&self) -> &GroupedCountByteSize {
        self.metadata.events_estimated_json_encoded_byte_size()
    }

    fn bytes_sent(&self) -> Option<usize> {
        Some(self.metadata.request_encoded_size())
    }
}

#[derive(Clone)]
pub struct LokiRequest {
    pub compression: Compression,
    pub finalizers: EventFinalizers,
    pub payload: Bytes,
    pub tenant_id: Option<String>,
    pub metadata: RequestMetadata,
}

impl Finalizable for LokiRequest {
    fn take_finalizers(&mut self) -> EventFinalizers {
        self.finalizers.take_finalizers()
    }
}

impl MetaDescriptive for LokiRequest {
    fn get_metadata(&self) -> &RequestMetadata {
        &self.metadata
    }

    fn metadata_mut(&mut self) -> &mut RequestMetadata {
        &mut self.metadata
    }
}

#[derive(Debug, Clone)]
pub struct LokiService {
    endpoint: UriSerde,
    client: HttpClient,
}

impl LokiService {
    pub fn new(
        client: HttpClient,
        endpoint: UriSerde,
        path: String,
        auth: Option<Auth>,
    ) -> crate::Result<Self> {
        let endpoint = endpoint.append_path(&path)?.with_auth(auth);

        Ok(Self { client, endpoint })
    }
}

impl Service<LokiRequest> for LokiService {
    type Response = LokiResponse;
    type Error = LokiError;
    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;

    fn poll_ready(&mut self, _cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        Poll::Ready(Ok(()))
    }

    fn call(&mut self, request: LokiRequest) -> Self::Future {
        let content_type = match request.compression {
            Compression::Snappy => "application/x-protobuf",
            _ => "application/json",
        };
        let mut req = http::Request::post(&self.endpoint.uri).header("Content-Type", content_type);

        let metadata = request.get_metadata().clone();

        if let Some(tenant_id) = request.tenant_id {
            req = req.header("X-Scope-OrgID", tenant_id);
        }

        if let Some(ce) = request.compression.content_encoding() {
            req = req.header("Content-Encoding", ce);
        }

        let body = hyper::Body::from(request.payload);
        let mut req = req.body(body).unwrap();

        if let Some(auth) = &self.endpoint.auth {
            auth.apply(&mut req);
        }

        let mut client = self.client.clone();

        Box::pin(async move {
            match client.call(req).in_current_span().await {
                Ok(response) => {
                    let status = response.status();

                    if status.is_success() {
                        Ok(LokiResponse { metadata })
                    } else {
                        Err(LokiError::ServerError { code: status })
                    }
                }
                Err(error) => Err(LokiError::HttpError { error }),
            }
        })
    }
}