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"0.4" +pretty_env_logger = "0.3" +tokio = { version = "1", features = ["full"] } diff --git a/README.md b/README.md new file mode 100644 index 0000000..5130b96 --- /dev/null +++ b/README.md @@ -0,0 +1,56 @@ +# metric2fs-rs + +A simple graphite metric metadata storage. + +This is a POC. + +## Features + +Handle most, but not all, graphite paths style & wildcards listed on https://graphite.readthedocs.io/en/latest/render_api.html#paths-and-wildcards + +* Asterisk globbing (eg: `test*`); +* List & ranges (eg: `[a-z0-9]` or `[abc]`); +* Value lists (eg: `{abc,def}`). + +However, the double star globbing is not supported (eg: `**`). + + +## Build & run + +```sh +cargo build +RUST_LOG=debug cargo run +``` + +## API + +### Write a metric + +Send a POST request to `/metric` with metric(s) in the body + +```sh +curl -sq -d testaroo.a.a.a http://localhost:3000/metric +``` + +### Retrieve metrics + +Send a GET request to `/metric` with `q=` parameter as a globbing expression + +```sh +curl "http://localhost:3000/metric?q=te*ar*.\{a\}.\{b,c\}.\[bcd\]" +``` + +## Testing + +```sh +for metric in testaroo.{a,b,c}.{a,b,c}.{a,b,c,d,e,f}; do curl -sq -d $metric http://localhost:3000/metric ; done +curl "http://localhost:3000/metric?q=te*ar*.\{a\}.\{b,c\}.\[b-e\]" +testaroo.a.b.b +testaroo.a.b.c +testaroo.a.b.d +testaroo.a.b.e +testaroo.a.c.b +testaroo.a.c.c +testaroo.a.c.d +testaroo.a.c.e +``` diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..fbc1a07 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,195 @@ +/* + * metric2fs-rs + */ +use std::fs::{self, OpenOptions}; +use std::collections::HashMap; +use std::convert::Infallible; +use std::net::SocketAddr; +use std::path::PathBuf; + +use anyhow::Result; +use filetime::{FileTime,set_file_mtime}; +use globset::Glob; + +use hyper::{Body, Request, Response, Server, Method, StatusCode}; +use hyper::body; +use hyper::service::{make_service_fn, service_fn}; + +extern crate pretty_env_logger; +#[macro_use] extern crate log; + +fn write_metric(metric: String) { + let dir = metric.replace(".", "/"); + + let mut path = PathBuf::new(); + path.push(&dir); + + let res = fs::create_dir_all(&path); + if let Err(res) = res { + warn!("Could not create directory: {}", res); + + return; + } + + path.push(".md"); + + let res = OpenOptions::new().create(true).write(true).open(&path); + if let Err(res) = res { + warn!("Could not create metric: {}", res); + } + + let res = set_file_mtime(&path, FileTime::now()); + if let Err(res) = res { + warn!("Could not update metric's timestamp: {}", res); + } + + debug!("Created metric: {}", metric) +} + +fn fetch_metric(expr: String) -> Result> { + let components = expr.split(".").collect::>(); + + let mut init_path = PathBuf::new(); + init_path.push("."); + + info!("Searching metrics for expr: {}", expr); + + let mut pathes = vec![]; + pathes.push(init_path); + + for component in components.iter() { + let gs = Glob::new(component)?.compile_matcher(); + + let mut new_pathes = vec![]; + for path in pathes.iter_mut() { + if !path.is_dir() { + continue; + } + + for entry in fs::read_dir(path)? { + let dir = entry?; + + if gs.is_match(dir.file_name()) { + new_pathes.push(dir.path()); + } + } + } + + pathes = new_pathes; + } + + let mut metrics : Vec = vec![]; + + for path in pathes { + let mut pb = PathBuf::new(); + + pb.push(path); + pb.push(".md"); + + let stat = fs::metadata(&pb); + if let Ok(_stat) = stat { + let metric_name = String::from(pb.to_str().unwrap()); + let metric_name = metric_name.strip_prefix("./").unwrap(); + let metric_name = metric_name.strip_suffix("/.md").unwrap(); + let metric_name = metric_name.replace("/", "."); + + debug!("Found metric: {}", metric_name); + metrics.push(metric_name.to_string()) + } + } + + info!("Got {} metric(s).", metrics.len()); + + Ok(metrics) +} + +async fn handlers(req: Request) -> Result, Infallible> { + let mut response = Response::new(Body::empty()); + + match (req.method(), req.uri().path()) { + (&Method::GET, "/metric") => { + let query = req.uri().query(); + let mut hm = HashMap::new(); + + for q in query.unwrap().split("&") { + let parts = q.split("=").collect::>(); + if parts.len() != 2 { + continue; + } + + hm.insert(String::from(parts[0]), String::from(parts[1])); + } + + let entry = hm.get(&String::from("q")); + + if entry.is_none() { + *response.status_mut() = StatusCode::NOT_ACCEPTABLE; + return Ok(response); + } + + let entry = entry.unwrap(); + + if let Ok(list) = fetch_metric(String::from(entry)) { + *response.body_mut() = list.join("\n").into(); + } + }, + (&Method::POST, "/metric") => { + let content = body::to_bytes(req.into_body()).await; + + if let Err(_) = content { + *response.status_mut() = StatusCode::NOT_ACCEPTABLE; + return Ok(response); + } + + let content = content.unwrap(); + + if !content.is_ascii() { + *response.status_mut() = StatusCode::NOT_ACCEPTABLE; + return Ok(response); + } + + if let Ok(content) = String::from_utf8(content.to_vec()) { + let metrics = content.split("\n").collect::>(); + + for metric in metrics { + debug!("Creating metric {}", metric); + write_metric(String::from(metric)); + } + } + }, + _ => { + *response.status_mut() = StatusCode::NOT_FOUND; + }, + }; + + Ok(response) +} + +async fn shutdown_signal() { + // Wait for the CTRL+C signal + tokio::signal::ctrl_c() + .await + .expect("failed to install CTRL+C signal handler"); +} + +#[tokio::main] +async fn main() { + pretty_env_logger::init(); + + let addr = SocketAddr::from(([127, 0, 0, 1], 3000)); + + let make_svc = make_service_fn(|_conn| async { + Ok::<_, Infallible>(service_fn(handlers)) + }); + + if let Err(res) = std::env::set_current_dir("./db/") { + panic!("{:?}", res); + } + + let server = Server::bind(&addr).serve(make_svc); + let graceful = server.with_graceful_shutdown(shutdown_signal()); + + if let Err(e) = graceful.await { + eprintln!("server error: {}", e); + } +}