osentities 2.0.0

Shared library for Pica
Documentation 
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

use crate::TimedExt;
use axum::body::Body;
use axum::extract::Request;
use axum::middleware::Next;
use axum::response::IntoResponse;
use http::StatusCode;
use opentelemetry::{global, trace::TracerProvider};
use opentelemetry_otlp::{SpanExporter, WithExportConfig};
use opentelemetry_sdk::runtime::Tokio;
use opentelemetry_sdk::trace::TracerProvider as OtelTracerProvider;
use tracing::subscriber::set_global_default;
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_log::LogTracer;
use tracing_opentelemetry::OpenTelemetryLayer;
use tracing_subscriber::fmt::MakeWriter;
use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};

pub struct Telemetry<T>
where
    T: SubscriberExt + Send + Sync + 'static,
{
    pub subscriber: T,
}

pub fn get_subscriber<Sink>(
    name: String,
    env_filter: String,
    sink: Sink,
    otlp_url: Option<String>,
) -> Telemetry<impl SubscriberExt + Send + Sync + 'static>
where
    Sink: for<'a> MakeWriter<'a> + Send + Sync + 'static,
{
    let formatting_layer: BunyanFormattingLayer<Sink> =
        BunyanFormattingLayer::new(name.clone(), sink);

    let filter_layer =
        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter));

    match otlp_url {
        Some(otlp_url) => {
            let exporter = SpanExporter::builder()
                .with_tonic()
                .with_endpoint(otlp_url.clone())
                .build()
                .expect("Failed to create OTLP exporter");

            let provider = OtelTracerProvider::builder()
                .with_resource(opentelemetry_sdk::Resource::new(vec![
                    opentelemetry::KeyValue::new("service.name", name),
                ]))
                .with_batch_exporter(exporter, Tokio)
                .build();

            global::set_tracer_provider(provider.clone());
            let tracer = provider.tracer("tracing-otel-subscriber");

            let telemetry: Telemetry<Box<dyn SubscriberExt + Send + Sync>> = Telemetry {
                subscriber: Box::new(
                    Registry::default()
                        .with(OpenTelemetryLayer::new(tracer))
                        .with(filter_layer)
                        .with(JsonStorageLayer)
                        .with(formatting_layer),
                ),
            };

            telemetry
        }
        None => {
            let telemetry: Telemetry<Box<dyn SubscriberExt + Send + Sync>> = Telemetry {
                subscriber: Box::new(
                    Registry::default()
                        .with(filter_layer)
                        .with(JsonStorageLayer)
                        .with(formatting_layer),
                ),
            };
            telemetry
        }
    }
}

pub fn init_subscriber(subscriber: Telemetry<impl SubscriberExt + Send + Sync + 'static>) {
    LogTracer::init().expect("Failed to set logger");
    set_global_default(subscriber.subscriber).expect("Failed to set subscriber");
}

pub async fn log_request_middleware(
    req: Request<Body>,
    next: Next,
) -> Result<impl IntoResponse, (StatusCode, String)> {
    let path = req.uri().path().to_string();
    let method = req.method().to_string();
    let res = next
        .run(req)
        .timed(|response, elapsed| {
            let status = response.status();
            let logger = |str| {
                if status.is_server_error() {
                    tracing::error!("{}", str)
                } else if status.is_client_error() {
                    tracing::warn!("{}", str)
                } else {
                    tracing::info!("{}", str)
                }
            };

            logger(format!(
                "[{} {}] Elapsed time: {}ms | Status: {}",
                method,
                path,
                elapsed.as_millis(),
                status,
            ));
        })
        .await;

    Ok(res)
}

#[derive(Debug)]
pub struct OtelGuard {
    pub otlp_url: Option<String>,
}

impl Drop for OtelGuard {
    fn drop(&mut self) {
        if self.otlp_url.is_some() {
            tracing::info!("Shutting down OpenTelemetry");
            opentelemetry::global::shutdown_tracer_provider();
        }
    }
}