solidb 1.0.1

A lightweight, high-performance structured database server written in Rust.
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

pub mod propagation {
    use axum::http::header::HeaderValue;
    use axum::http::Request;

    pub const TRACEPARENT_HEADER: &str = "traceparent";
    pub const TRACESTATE_HEADER: &str = "tracestate";

    #[derive(Debug, Clone)]
    pub struct TraceContext {
        pub version: String,
        pub trace_id: String,
        pub span_id: String,
        pub trace_flags: String,
    }

    impl TraceContext {
        pub fn new(trace_id: String, span_id: String) -> Self {
            Self {
                version: "00".to_string(),
                trace_id,
                span_id,
                trace_flags: "01".to_string(),
            }
        }

        pub fn to_header(&self) -> String {
            format!(
                "{}-{}-{}-{}",
                self.version, self.trace_id, self.span_id, self.trace_flags
            )
        }

        pub fn from_header(header: &str) -> Option<Self> {
            let parts: Vec<&str> = header.split('-').collect();
            if parts.len() >= 4 {
                return Some(TraceContext {
                    version: parts[0].to_string(),
                    trace_id: parts[1].to_string(),
                    span_id: parts[2].to_string(),
                    trace_flags: parts[3].to_string(),
                });
            }
            None
        }
    }

    pub fn extract_trace_context<B>(request: &Request<B>) -> Option<TraceContext> {
        request
            .headers()
            .get(TRACEPARENT_HEADER)
            .and_then(|v| v.to_str().ok())
            .and_then(TraceContext::from_header)
    }

    pub fn inject_trace_context<B>(
        mut request: Request<B>,
        trace_ctx: &TraceContext,
    ) -> Request<B> {
        if let Ok(header_value) = HeaderValue::from_str(&trace_ctx.to_header()) {
            request
                .headers_mut()
                .insert(TRACEPARENT_HEADER, header_value);
        }
        request
    }
}

pub mod metrics {
    use std::sync::atomic::{AtomicU64, Ordering};
    use std::sync::Arc;

    #[derive(Debug, Clone)]
    pub struct RequestMetrics {
        pub requests_total: Arc<AtomicU64>,
        pub requests_in_flight: Arc<AtomicU64>,
        pub latency_sum: Arc<AtomicU64>,
        pub latency_count: Arc<AtomicU64>,
    }

    impl RequestMetrics {
        pub fn new() -> Self {
            Self {
                requests_total: Arc::new(AtomicU64::new(0)),
                requests_in_flight: Arc::new(AtomicU64::new(0)),
                latency_sum: Arc::new(AtomicU64::new(0)),
                latency_count: Arc::new(AtomicU64::new(0)),
            }
        }

        pub fn record_request(&self) {
            self.requests_total.fetch_add(1, Ordering::Relaxed);
            self.requests_in_flight.fetch_add(1, Ordering::Relaxed);
        }

        pub fn end_request(&self, latency_ms: u64) {
            self.requests_in_flight.fetch_sub(1, Ordering::Relaxed);
            self.latency_sum.fetch_add(latency_ms, Ordering::Relaxed);
            self.latency_count.fetch_add(1, Ordering::Relaxed);
        }

        pub fn get_stats(&self) -> (u64, u64, u64, u64) {
            (
                self.requests_total.load(Ordering::Relaxed),
                self.requests_in_flight.load(Ordering::Relaxed),
                self.latency_sum.load(Ordering::Relaxed),
                self.latency_count.load(Ordering::Relaxed),
            )
        }
    }

    impl Default for RequestMetrics {
        fn default() -> Self {
            Self::new()
        }
    }
}

pub fn get_current_trace_context() -> Option<propagation::TraceContext> {
    use opentelemetry::trace::TraceContextExt;

    let span = tracing::Span::current();
    let ctx = span.context();

    use tracing_opentelemetry::OpenTelemetrySpanExt;
    let otel_ctx = ctx.clone();

    let span_ref = otel_ctx.span();
    let span_ctx = span_ref.span_context();
    if span_ctx.is_valid() {
        return Some(propagation::TraceContext::new(
            format!("{}", span_ctx.trace_id()),
            format!("{}", span_ctx.span_id()),
        ));
    }
    None
}

#[cfg(test)]
mod tests {
    use super::propagation::*;

    #[test]
    fn test_trace_context_roundtrip() {
        let ctx = TraceContext::new(
            "0af7651916cd43dd8448eb211c80319c".to_string(),
            "b7ad6b7169203331".to_string(),
        );
        let header = ctx.to_header();
        assert_eq!(
            header,
            "00-0af7651916cd43dd8448eb211c80319c-b7ad6b7169203331-01"
        );

        let ctx2 = TraceContext::from_header(&header).unwrap();
        assert_eq!(ctx.trace_id, ctx2.trace_id);
        assert_eq!(ctx.span_id, ctx2.span_id);
    }
}