global: snapshot

crates/brk_server/src/api/interface.rs

@@ -0,0 +1,150 @@
+use std::time::Duration;
+
+use axum::{
+    Json,
+    body::Body,
+    extract::{Query, State},
+    http::{HeaderMap, StatusCode, Uri},
+    response::{IntoResponse, Response},
+};
+use brk_error::{Error, Result};
+use brk_interface::{Format, Output, Params};
+use brk_vecs::Stamp;
+use quick_cache::sync::GuardResult;
+
+use crate::{HeaderMapExtended, ResponseExtended};
+
+use super::AppState;
+
+const MAX_WEIGHT: usize = 320_000;
+
+pub async fn handler(
+    uri: Uri,
+    headers: HeaderMap,
+    query: Query<Params>,
+    State(app_state): State<AppState>,
+) -> Response {
+    match req_to_response_res(uri, headers, query, app_state) {
+        Ok(response) => response,
+        Err(error) => {
+            let mut response =
+                (StatusCode::INTERNAL_SERVER_ERROR, error.to_string()).into_response();
+            response.headers_mut().insert_cors();
+            response
+        }
+    }
+}
+
+fn req_to_response_res(
+    uri: Uri,
+    headers: HeaderMap,
+    Query(params): Query<Params>,
+    AppState {
+        interface, cache, ..
+    }: AppState,
+) -> Result<Response> {
+    let vecs = interface.search(&params);
+
+    if vecs.is_empty() {
+        return Ok(Json(vec![] as Vec<usize>).into_response());
+    }
+
+    let from = params.from();
+    let to = params.to();
+    let format = params.format();
+
+    // TODO: From and to should be capped here
+
+    let weight = vecs
+        .iter()
+        .map(|(_, v)| v.range_weight(from, to))
+        .sum::<usize>();
+
+    if weight > MAX_WEIGHT {
+        return Err(Error::Str(
+            "Request is too heavy, max weight is {MAX_WEIGHT}",
+        ));
+    }
+
+    // TODO: height should be from vec, but good enough for now
+    let etag = vecs
+        .first()
+        .unwrap()
+        .1
+        .etag(Stamp::from(interface.get_height()), to);
+
+    if headers
+        .get_if_none_match()
+        .is_some_and(|prev_etag| etag == prev_etag)
+    {
+        return Ok(Response::new_not_modified());
+    }
+
+    let guard_res = cache.get_value_or_guard(
+        &format!("{}{}{etag}", uri.path(), uri.query().unwrap_or("")),
+        Some(Duration::from_millis(500)),
+    );
+
+    let mut response = if let GuardResult::Value(v) = guard_res {
+        Response::new(Body::from(v))
+    } else {
+        match interface.format(vecs, &params.rest)? {
+            Output::CSV(s) => {
+                if let GuardResult::Guard(g) = guard_res {
+                    g.insert(s.clone().into())
+                        .map_err(|_| Error::QuickCacheError)?;
+                }
+                s.into_response()
+            }
+            Output::TSV(s) => {
+                if let GuardResult::Guard(g) = guard_res {
+                    g.insert(s.clone().into())
+                        .map_err(|_| Error::QuickCacheError)?;
+                }
+                s.into_response()
+            }
+            Output::MD(s) => {
+                if let GuardResult::Guard(g) = guard_res {
+                    g.insert(s.clone().into())
+                        .map_err(|_| Error::QuickCacheError)?;
+                }
+                s.into_response()
+            }
+            Output::Json(v) => {
+                let json = match v {
+                    brk_interface::Value::Single(v) => serde_json::to_vec(&v)?,
+                    brk_interface::Value::List(v) => serde_json::to_vec(&v)?,
+                    brk_interface::Value::Matrix(v) => serde_json::to_vec(&v)?,
+                };
+
+                if let GuardResult::Guard(g) = guard_res {
+                    g.insert(json.clone().into())
+                        .map_err(|_| Error::QuickCacheError)?;
+                }
+
+                json.into_response()
+            }
+        }
+    };
+
+    let headers = response.headers_mut();
+
+    headers.insert_cors();
+
+    headers.insert_etag(&etag);
+
+    match format {
+        Some(format) => {
+            headers.insert_content_disposition_attachment();
+            match format {
+                Format::CSV => headers.insert_content_type_text_csv(),
+                Format::MD => headers.insert_content_type_text_plain(),
+                Format::TSV => headers.insert_content_type_text_tsv(),
+                Format::JSON => headers.insert_content_type_application_json(),
+            }
+        }
+        _ => headers.insert_content_type_application_json(),
+    };
+
+    Ok(response)
+}