promwrite 0.1.0

a simple prometheus remote write client library
Documentation 
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mod types;

use std::collections::BTreeMap;

use chrono::Utc;
use reqwest::header::{
    CONTENT_ENCODING, CONTENT_TYPE, HeaderMap, HeaderName, HeaderValue,
    USER_AGENT,
};

use crate::types::{Request, Sample, Timeseries};
#[derive(Clone)]
pub struct Mertic {
    http: reqwest::Client,
    url: String,
    headers: HeaderMap,
}

impl Mertic {
    pub fn new(url: String) -> Self {
        let cli = reqwest::Client::new();
        let mut headers = HeaderMap::new();
        headers.insert(
            CONTENT_TYPE,
            HeaderValue::from_static(
                "application/x-protobuf;proto=io.prometheus.write.v2.Request",
            ),
        );
        headers.insert(CONTENT_ENCODING, HeaderValue::from_static("snappy"));
        headers.insert(
            HeaderName::from_static("x-prometheus-remote-write-version"),
            HeaderValue::from_static("2.0.0"),
        );
        headers.insert(USER_AGENT, HeaderValue::from_static("promwrite/0.0.1"));

        Self {
            http: cli,
            url: url,
            headers: headers,
        }
    }
    pub fn name(&self, name: String, unit: String, help: String) -> Label {
        let mut labels: BTreeMap<String, String> = BTreeMap::new();
        let mut n = name;
        if !unit.is_empty() {
            n = n + "_" + &unit;
        }
        //labels.insert("__name__".to_string(), n.clone());

        Label {
            metric: self.clone(),
            name: n,
            uint: unit,
            help: help,
            lables: labels,
            samples: vec![],
        }
    }
}
#[derive(Clone)]
pub struct Label {
    metric: Mertic,
    pub name: String,
    pub uint: String,
    pub help: String,
    pub lables: BTreeMap<String, String>,
    pub samples: Vec<Sample>,
}

impl Label {
    pub fn label(&mut self, name: String, value: String) -> &mut Self {
        self.lables.insert(name, value);

        self
    }
    pub fn value(&mut self, v: f64) -> &mut Self {
        self.samples.push(Sample {
            value: v,
            timestamp: Utc::now().timestamp_millis(),
        });

        self
    }
    pub async fn send(&mut self) {
        let mut req = Request {
            symbols: vec![],
            timeseries: vec![],
        };
        self.lables
            .insert("__name__".to_string(), self.name.to_string());
        let mut labelref: Vec<u32> = vec![];

        for (pos, key) in self.lables.keys().enumerate() {
            req.symbols.push(key.to_string());
            req.symbols
                .push(self.lables.get(&key.to_string()).unwrap().to_string());

            labelref.push(pos as u32 * 2);
            labelref.push(pos as u32 * 2 + 1);
        }

        req.timeseries.push(Timeseries {
            labels_refs: labelref,
            samples: self.samples.clone(),
        });

        if let Ok(r) = snap::raw::Encoder::new()
            .compress_vec(&prost::Message::encode_to_vec(&req))
        {
            self.metric
                .http
                .post(&self.metric.url)
                .headers(self.metric.headers.clone())
                .body(r)
                .send()
                .await
                .unwrap();
        }
        self.lables.clear();
        self.samples.clear();
    }
}

#[cfg(test)]
mod tests {

    use crate::Mertic;

    #[tokio::test]
    async fn test_request() {
        //
        let m = Mertic::new("http://127.0.0.1:9090/api/v1/write".to_string());
        let mut up =
            m.name("rust".to_string(), "up".to_string(), "".to_string());

        up.label("hostname".to_string(), "host1".to_string())
            .value(20.0)
            .send()
            .await;
        up.value(10.0).send().await;

        let mut test =
            m.name("test".to_string(), "up".to_string(), "".to_string());
        test.label("hostname".to_string(), "host1".to_string())
            .label("ip".to_string(), "192.168.1.1".to_string())
            .value(30.0)
            .send()
            .await;
    }
}