commit e4aff3f39f5a7b75141511de425ac7e20c4bf48c
Author: Patrick MARIE <pm@mkz.me>
Date:   Wed Mar 24 23:30:02 2021 +0100

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..8182dfe
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "metric2fs-rs"
+version = "0.1.0"
+authors = ["Patrick MARIE <pm@mkz.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.39"
+filetime = "0.2.14"
+futures = "0.3"
+globset = "0.4.6"
+hyper = { version = "0.14", features = ["full"] }
+log = "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<Vec<String>> {
+    let components = expr.split(".").collect::<Vec<&str>>();
+
+    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<String> = 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<Body>) -> Result<Response<Body>, 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::<Vec<&str>>();
+                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::<Vec<&str>>();
+
+                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);
+    }
+}