rotonda 0.4.0

composable, programmable BGP engine
Documentation 
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use std::path::Path;
use std::time::Duration;
use std::{ops::Deref, path::PathBuf};
use std::sync::Arc;

use async_trait::async_trait;
use hyper::{Body, Method, Request, Response};
use log::debug;
use tokio::sync::mpsc::Sender;
use tokio::sync::oneshot;
use tokio::time::timeout;

use crate::http::{
    extract_params, get_param, MatchedParam, PercentDecodedPath, ProcessRequest, QueryParams
};

pub struct Processor {
    http_api_path: Arc<String>,
    update_path: Option<PathBuf>,
    queue_tx: Sender<super::unit::QueueEntry>,
}

impl Processor {
    pub fn new(
        http_api_path: Arc<String>,
    update_path: Option<PathBuf>,
        queue_tx: Sender<super::unit::QueueEntry>,
    ) -> Self {
        Self {
            http_api_path,
            update_path,
            queue_tx,
        }
    }
}


#[async_trait]
impl ProcessRequest for Processor {
    async fn process_request(
        &self,
        request: &Request<Body>,
    ) -> Option<Response<Body>> {
        let req_path = request.uri().decoded_path();
        if request.method() != Method::GET {
            return None;
        }
        let action = match req_path.strip_prefix(&*self.http_api_path) {
            Some(action) => action,
            None => return None,
        };

        if action.starts_with("queue") {
            return self.queue(request).await;
        }

    None
    }

}
impl Processor {
    async fn queue(&self, request: &Request<Body>) -> Option<Response<Body>> {

        let update_dir = if let Some(ref path) = self.update_path {
            match Path::new(path).canonicalize() {
                Ok(path) => path,
                Err(e) => {
                    return Some(err(format!(
                                "configured mrt-file-in update_path {} \
                            invalid: {}",
                            path.to_string_lossy(),
                            e
                    )))
                }
            }
        } else {
            return Some(
                err("queueing updates requires 'update_path' in the \
                    configuration of this mrt-file-in unit")
            )
        };


        let params = extract_params(request);
        let filename = match get_param(&params, "file") {
            Some(MatchedParam::Exact(file)) => file,
            Some(MatchedParam::Family(..)) |
            None => return Some(Response::builder()
                .status(hyper::StatusCode::BAD_REQUEST)
                .header("Content-Type", "text/plain")
                .body("missing or invalid required param 'file'".into())
                .unwrap())
        };
        let filename = Path::new(filename);
        if !filename.is_relative() {
            return Some(err("not relative"));
        }

        let mut full_path: PathBuf = update_dir.clone();
        
        full_path.push(filename);
        debug!("fill path pre canonicalize: {}", &full_path.to_string_lossy());

        let full_path = match full_path.canonicalize() {
            Ok(path) => {
                debug!("canonicalized to {}", &path.to_string_lossy());
                path
            }
            Err(e) => {
                return Some(
                    err(format!("file {} does not exist or path invalid: {}",
                            full_path.to_string_lossy(),
                            e
                    ))
                );
            }
        };
        if !full_path.ancestors().any(|a| a == update_dir) {
            return Some(err(format!(
                        "file not under configured directory {}",
                        update_dir.to_string_lossy()
            )));
        }


        let (tx, rx) = oneshot::channel::<Result<String, String>>();

        debug!("queueing {}", &full_path.to_string_lossy());
        let _ = self.queue_tx.send((
                full_path.clone(),
                Some(tx)
        )).await;

        let processing_res = match timeout(Duration::from_secs(5), rx).await {
            Err(_) => {
                //nothing wrong per se, processing still ongoing:
                return Some(Response::builder()
                    .status(hyper::StatusCode::OK)
                    .header("Content-Type", "text/plain")
                    .body(format!(
                            "queued {} for processing",
                            full_path.to_string_lossy()
                    ).into())
                    .unwrap()
                )
            }
            Ok(processing_res) => processing_res,
        };

        match processing_res {
            Ok(Ok(m)) => {
                Some(Response::builder()
                    .status(hyper::StatusCode::OK)
                    .header("Content-Type", "text/plain")
                    .body(format!("processed {}: {m}", full_path.to_string_lossy()).into())
                    .unwrap())
            }
            Ok(Err(e)) => Some(err(e)),
            Err(e) => Some(err(e.to_string())),
        }
    }
}

fn err(msg: impl Into<Body>) -> Response<Body> {
    Response::builder()
        .status(hyper::StatusCode::BAD_REQUEST)
        .header("Content-Type", "text/plain")
        .body(msg.into())
        .unwrap()
}