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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

use std::{
    collections::BTreeMap,
    task::{Context, Poll},
};

use bytes::{Buf, Bytes};
use futures::future::BoxFuture;
use http::{Request, StatusCode, Uri};
use hyper::Body;
use snafu::ResultExt;
use tower::Service;
use vector_lib::event::{EventFinalizers, EventStatus, Finalizable};
use vector_lib::request_metadata::{GroupedCountByteSize, MetaDescriptive, RequestMetadata};
use vector_lib::stream::DriverResponse;

use crate::{
    http::{BuildRequestSnafu, CallRequestSnafu, HttpClient, HttpError},
    sinks::util::retries::{RetryAction, RetryLogic},
};

#[derive(Debug, Default, Clone)]
pub struct TraceApiRetry;

impl RetryLogic for TraceApiRetry {
    type Error = HttpError;
    type Response = TraceApiResponse;

    fn is_retriable_error(&self, _error: &Self::Error) -> bool {
        true
    }

    fn should_retry_response(&self, response: &Self::Response) -> RetryAction {
        let status = response.status_code;
        match status {
            // Use the same status code/retry policy as the Trace agent, additionally retrying
            // forbidden requests.
            //
            // This retry logic will be expanded further, but specifically retrying unauthorized
            // requests for now. I verified using `curl` that `403` is the response code for this.
            //
            // https://github.com/vectordotdev/vector/issues/10870
            // https://github.com/vectordotdev/vector/issues/12220
            StatusCode::FORBIDDEN => RetryAction::Retry("forbidden".into()),
            StatusCode::REQUEST_TIMEOUT => RetryAction::Retry("request timeout".into()),
            _ if status.is_server_error() => RetryAction::Retry(
                format!("{}: {}", status, String::from_utf8_lossy(&response.body)).into(),
            ),
            _ if status.is_success() => RetryAction::Successful,
            _ => RetryAction::DontRetry(format!("response status: {}", status).into()),
        }
    }
}

#[derive(Debug, Clone)]
pub struct TraceApiRequest {
    pub body: Bytes,
    pub headers: BTreeMap<String, String>,
    pub finalizers: EventFinalizers,
    pub uri: Uri,
    pub uncompressed_size: usize,
    pub metadata: RequestMetadata,
}

impl TraceApiRequest {
    pub fn into_http_request(self) -> http::Result<Request<Body>> {
        let mut request = Request::post(self.uri);
        for (k, v) in self.headers.iter() {
            request = request.header(k, v);
        }
        request.body(Body::from(self.body))
    }
}

impl Finalizable for TraceApiRequest {
    fn take_finalizers(&mut self) -> EventFinalizers {
        std::mem::take(&mut self.finalizers)
    }
}

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

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

#[derive(Debug)]
pub struct TraceApiResponse {
    status_code: StatusCode,
    body: Bytes,
    byte_size: GroupedCountByteSize,
    uncompressed_size: usize,
}

impl DriverResponse for TraceApiResponse {
    fn event_status(&self) -> EventStatus {
        if self.status_code.is_success() {
            EventStatus::Delivered
        } else if self.status_code.is_client_error() {
            EventStatus::Rejected
        } else {
            EventStatus::Errored
        }
    }

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

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

/// Wrapper for the Datadog API.
///
/// Provides a `tower::Service` for the Datadog Traces API, allowing it to be
/// composed within a Tower "stack", such that we can easily and transparently
/// provide retries, concurrency limits, rate limits, and more.
#[derive(Debug, Clone)]
pub struct TraceApiService {
    client: HttpClient,
}

impl TraceApiService {
    pub const fn new(client: HttpClient) -> Self {
        Self { client }
    }
}

impl Service<TraceApiRequest> for TraceApiService {
    type Response = TraceApiResponse;
    type Error = HttpError;
    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;

    // Emission of Error internal event is handled upstream by the caller
    fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
        self.client.poll_ready(cx)
    }

    // Emission of Error internal event is handled upstream by the caller
    fn call(&mut self, mut request: TraceApiRequest) -> Self::Future {
        let client = self.client.clone();

        Box::pin(async move {
            let metadata = std::mem::take(request.metadata_mut());
            let byte_size = metadata.into_events_estimated_json_encoded_byte_size();
            let uncompressed_size = request.uncompressed_size;
            let http_request = request.into_http_request().context(BuildRequestSnafu)?;

            let response = client.send(http_request).await?;
            let (parts, body) = response.into_parts();
            let mut body = hyper::body::aggregate(body)
                .await
                .context(CallRequestSnafu)?;
            let body = body.copy_to_bytes(body.remaining());

            Ok(TraceApiResponse {
                status_code: parts.status,
                body,
                byte_size,
                uncompressed_size,
            })
        })
    }
}