Prometheus push

This crate works as an extension to prometheus crates like prometheus to be able to push non-blocking (default) or blocking to your Prometheus pushgateway and with a less dependent setup of reqwest (no openssl for example) or with an implementation of your own http client.

By default you have to implement the Push trait to use it with your choice of http client or you can use the with_reqwest feature. This feature already implements Push in a PushClient that leverages reqwest under the hood. Reqwest is setup without default features (minimal set) in this case so it should not interfere with your own applications reqwest setup (e.g. rust-tls).

Async functionality is considered the standard in this crate but you can enable the blocking feature to get the implementation without async. You can enable the corresponding blocking reqwest implementation with the with_reqwest_blocking feature in which case you enable the blocking feature of the reqwest crate as well.

In terms of the underlying prometheus functionality you have to implement the ConvertMetrics trait or you use the already implemented feature prometheus_crate that leverages the prometheus crate.

Example with features with_reqwest and prometheus_crate

use prometheus::core::Collector;
use prometheus::labels;
use prometheus::proto::MetricFamily;
use prometheus_push::non_blocking::MetricsPusher;
use prometheus_push::prometheus_crate::PrometheusMetricsConverter;
use prometheus_push::with_reqwest::PushClient;
use prometheus_push::MetricsPusher;
use reqwest::Client;
use url::Url;

pub type PrometheusMetricsPusher =
  MetricsPusher<PushClient, PrometheusMetricsConverter, MetricFamily, Box<dyn Collector>>;

let push_gateway: Url = <address to your instance>;
let client = Client::new();
let metrics_pusher = PrometheusMetricsPusher::from(client, &push_gateway)?;
metrics_pusher
  .push_all(
    "<your push jobs name>",
    &labels! { "<label_name>" => "<label_value>" },
    prometheus::gather(),
  )
  .await?;

Implement Push yourself

If you are not using reqwest as an http client you are free to implement the Push traits two methods yourself. As a guide you can use the implementation of the with_reqwest feature (see here).

Basically it is as simple as that.

use prometheus_push::Push;
...

pub struct YourClient {
    ...
}

#[async_trait::async_trait]
impl Push for YourClient {
    async fn push_all(&self, url: &Url, body: Vec<u8>, content_type: &str) -> Result<()> {
        // implement a PUT request with your client with this body and `content_type` in header
    }

    async fn push_add(&self, url: &Url, body: Vec<u8>, content_type: &str) -> Result<()> {
        // implement a POST request with your client with this body and `content_type` in header
    }
}

Implement ConvertMetrics yourself

In case you want to use another promethues client implementation you can implement your own type that implements the ConvertMetrics trait to inject it into your instance of MetricsPusher.

impl ConvertMetrics<YourMetricFamily, Box<dyn YourCollector>> for YourMetricsConverter {
    fn metric_families_from(
        &self,
        collectors: Vec<Box<dyn YourCollector>>,
    ) -> Result<Vec<YourMetricFamily>> {
        // implement the conversion from your Collectors to your MetricsFamilies 
    }

    fn create_push_details(
        &self,
        job: &str,
        url: &Url,
        grouping: &HashMap<&str, &str>,
        metric_families: Vec<YourMetricFamily>,
    ) -> Result<(Url, Vec<u8>, String)> {
        // create your push details for the `Push` methods: Url, body and content type
    }
}

Features

• default: by default async functionality and no reqwest is enabled
• non_blocking: this ennables the async functionality
• blocking: on top of the default feature you get the same functionality in a blocking fashion
• with_reqwest: this feature enables the non_blocking feature as well as reqwest in minimal configuration and enables the alredy implemented PushClient
• with_reqwest_blocking: like with_reqwest but including blocking instead of non_blocking
• prometheus_crate: enables the functionality of the prometheus crate

License

MIT