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// Copyright (c) The Libra Core Contributors
// SPDX-License-Identifier: Apache-2.0

#![recursion_limit = "128"]

#[macro_use]
extern crate prometheus;

pub mod counters;
mod json_encoder;
pub mod metric_server;

mod service_metrics;
pub use service_metrics::ServiceMetrics;

mod op_counters;
pub use op_counters::OpMetrics;

#[cfg(test)]
mod unit_tests;

// Re-export counter types from prometheus crate
pub use prometheus::{Histogram, IntCounter, IntCounterVec, IntGauge, IntGaugeVec};

use failure::Result;
use logger::prelude::*;
use prometheus::{
    core::{Collector, Metric},
    Encoder, TextEncoder,
};
use std::{
    collections::HashMap,
    fs::{create_dir_all, File, OpenOptions},
    hash::BuildHasher,
    io::Write,
    path::Path,
    thread, time,
};

fn get_metrics_file<P: AsRef<Path>>(dir_path: &P, file_name: &str) -> File {
    create_dir_all(dir_path).expect("Create metrics dir failed");

    let metrics_file_path = dir_path.as_ref().join(file_name);

    info!("Using metrics file {}", metrics_file_path.display());

    OpenOptions::new()
        .append(true)
        .create(true)
        .open(metrics_file_path)
        .expect("Open metrics file failed")
}

fn get_all_metrics_as_serialized_string() -> Result<Vec<u8>> {
    let all_metrics = prometheus::gather();

    let encoder = TextEncoder::new();
    let mut buffer = Vec::new();
    encoder.encode(&all_metrics, &mut buffer)?;
    Ok(buffer)
}

pub fn get_all_metrics() -> HashMap<String, String> {
    // TODO: use an existing metric encoder (same as used by
    // prometheus/metric-server)
    let all_metric_families = prometheus::gather();
    let mut all_metrics = HashMap::new();
    for metric_family in all_metric_families {
        let metrics = metric_family.get_metric();
        for metric in metrics {
            let v = if metric.has_counter() {
                metric.get_counter().get_value().to_string()
            } else if metric.has_gauge() {
                metric.get_gauge().get_value().to_string()
            } else if metric.has_histogram() {
                metric.get_histogram().get_sample_count().to_string()
            } else {
                panic!("Unknown counter {}", metric_family.get_name())
            };
            let mut metric_name = metric_family.get_name().to_owned();
            let labels = metric.get_label();
            if !labels.is_empty() {
                let label_strings: Vec<String> = labels
                    .iter()
                    .map(|l| format!("{}={}", l.get_name(), l.get_value()))
                    .collect();
                let labels_string = format!("{{{}}}", label_strings.join(","));
                metric_name.push_str(&labels_string);
            }

            all_metrics.insert(metric_name, v);
        }
    }

    all_metrics
}

// Launches a background thread which will periodically collect metrics
// every interval and push them to Pushgateway hosted at `address`
pub fn push_all_metrics_to_pushgateway_periodically(
    job: &str,
    address: &str,
    peer_id: &str,
    interval: u64,
) {
    info!("Start pushing metrics to {}", address);
    let job = job.to_owned();
    let addr = address.to_owned();
    let peer_id = peer_id.to_owned();
    thread::spawn(move || loop {
        let res = prometheus::push_metrics(
            &job,
            labels! {"instance".to_owned() => peer_id.clone(), },
            &addr,
            prometheus::gather(),
        );
        if let Err(e) = res {
            error!("Fail to push metrics: {}", e);
        }
        thread::sleep(time::Duration::from_millis(interval));
    });
}

// Launches a background thread which will periodically collect metrics
// every interval and write them to the provided file
pub fn dump_all_metrics_to_file_periodically<P: AsRef<Path>>(
    dir_path: &P,
    file_name: &str,
    interval: u64,
) {
    let mut file = get_metrics_file(dir_path, file_name);
    thread::spawn(move || loop {
        let mut buffer = get_all_metrics_as_serialized_string().expect("Error gathering metrics");
        if !buffer.is_empty() {
            buffer.push(b'\n');
            file.write_all(&buffer).expect("Error writing metrics");
        }
        thread::sleep(time::Duration::from_millis(interval));
    });
}

pub fn export_counter<M, S>(col: &mut HashMap<String, String, S>, counter: &M)
where
    M: Metric,
    S: BuildHasher,
{
    let c = counter.metric();
    col.insert(
        c.get_label()[0].get_name().to_string(),
        c.get_counter().get_value().to_string(),
    );
}

pub fn get_metric_name<M>(metric: &M) -> String
where
    M: Collector,
{
    metric.collect()[0].get_name().to_string()
}