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#[macro_use]
extern crate error_chain;
extern crate opentracingrust;
extern crate opentracingrust_zipkin;

extern crate serde;
#[macro_use]
extern crate serde_derive;
#[cfg(test)]
extern crate serde_yaml;
#[macro_use]
extern crate slog;

use opentracingrust::Tracer;
use opentracingrust::utils::ReporterThread;

use slog::Logger;


mod backends;
mod config;

mod errors {
    error_chain! {}
}

pub use self::errors::*;
pub use self::config::Config;


/// Tracer-dependent additional returns options.
///
/// Returned along-side the tracer itself to pass back any thread needed my the tracer.
pub enum TracerExtra {
    /// The tracer has no extra returns to provide.
    Nothing,

    /// The tracer's `ReporterThread` that send spans to the backend.
    ReporterThread(ReporterThread),
}


/// Creates a new tracer based on the given configuration.
pub fn tracer(config: Config, logger: Logger) -> Result<(Tracer, TracerExtra)> {
    match config {
        Config::Noop => self::backends::noop(),
        Config::Zipkin(config) => self::backends::zipkin(config, logger),
    }
}