Crate tracing_callgraph

A tracing Layer for generating a call graphs.

Overview

tracing is a framework for instrumenting Rust programs to collect scoped, structured, and async-aware diagnostics. tracing-callgraph provides helpers for consuming tracing instrumentation that can later be visualized as a call graph in Graphviz dot representation.

Layer Setup

use tracing_callgraph::GraphLayer;
use tracing_subscriber::{registry::Registry, prelude::*};

fn setup_global_subscriber() -> impl Drop {
    let (graph_layer, _guard) = GraphLayer::with_file("./output.dot").unwrap();
    let subscriber = Registry::default().with(graph_layer);

    tracing::subscriber::set_global_default(subscriber).expect("Could not set global default");
    _guard
}

#[tracing::instrument]
fn outer_a() {
    inner()
}

#[tracing::instrument]
fn outer_b() {
    inner()
}

#[tracing::instrument]
fn inner() {}

fn main() {
    let _ = setup_global_subscriber();
    outer_a();
    outer_b();
}

Structs

Error

The error type for tracing-flame

FlushGuard

An RAII guard for flushing a writer.

GraphLayer

A Layer that records span open events as directed edges in a call graph.