chore: Make the repo use examples and keep the library

examples/serve-http.rs

@@ -0,0 +1,143 @@
+#[macro_use] extern crate serde_derive;
+
+use std::str::from_utf8_unchecked;
+use std::io::{self, Write};
+use std::net::SocketAddr;
+use std::path::PathBuf;
+use std::error::Error;
+use std::sync::Arc;
+
+use raptor::rank::RankedStream;
+use raptor::{automaton, Metadata, CommonWords};
+use rocksdb::{DB, DBOptions, IngestExternalFileOptions};
+use fst::Streamer;
+use warp::Filter;
+
+use structopt::StructOpt;
+
+#[derive(Debug, StructOpt)]
+pub struct CommandHttp {
+    /// The address and port to bind the server to.
+    #[structopt(short = "l", default_value = "127.0.0.1:3030")]
+    pub listen_addr: SocketAddr,
+
+    /// The stop word file, each word must be separated by a newline.
+    #[structopt(long = "stop-words", parse(from_os_str))]
+    pub stop_words: PathBuf,
+
+    /// Meta file name (e.g. relaxed-colden).
+    #[structopt(parse(from_os_str))]
+    pub meta_name: PathBuf,
+}
+
+#[derive(Debug, Serialize)]
+struct Document<'a> {
+    id: u64,
+    title: &'a str,
+    description: &'a str,
+    image: &'a str,
+}
+
+#[derive(Debug, Deserialize)]
+struct SearchQuery { q: String }
+
+pub struct HttpServer {
+    listen_addr: SocketAddr,
+    common_words: Arc<CommonWords>,
+    metadata: Arc<Metadata>,
+    db: Arc<DB>,
+}
+
+impl HttpServer {
+    pub fn from_command(command: CommandHttp) -> io::Result<HttpServer> {
+        let common_words = CommonWords::from_file(command.stop_words)?;
+
+        let map_file = command.meta_name.with_extension("map");
+        let idx_file = command.meta_name.with_extension("idx");
+        let sst_file = command.meta_name.with_extension("sst");
+        let metadata = unsafe { Metadata::from_paths(map_file, idx_file).unwrap() };
+
+        let rocksdb = "rocksdb/storage";
+        let db = DB::open_default(rocksdb).unwrap();
+        let sst_file = sst_file.to_str().unwrap();
+        db.ingest_external_file(&IngestExternalFileOptions::new(), &[&sst_file]).unwrap();
+        drop(db);
+        let db = DB::open_for_read_only(DBOptions::default(), rocksdb, false).unwrap();
+
+        Ok(HttpServer {
+            listen_addr: command.listen_addr,
+            common_words: Arc::new(common_words),
+            metadata: Arc::new(metadata),
+            db: Arc::new(db),
+        })
+    }
+
+    pub fn serve(self) {
+        let HttpServer { listen_addr, common_words, metadata, db } = self;
+
+        let routes = warp::path("search")
+            .and(warp::query())
+            .map(move |query: SearchQuery| {
+                let body = search(metadata.clone(), db.clone(), common_words.clone(), &query.q).unwrap();
+                body
+            })
+            .with(warp::reply::with::header("Content-Type", "application/json"))
+            .with(warp::reply::with::header("Access-Control-Allow-Origin", "*"));
+
+        warp::serve(routes).run(listen_addr)
+    }
+}
+
+fn search<M, D, C>(metadata: M, database: D, common_words: C, query: &str) -> Result<String, Box<Error>>
+where M: AsRef<Metadata>,
+      D: AsRef<DB>,
+      C: AsRef<CommonWords>,
+{
+    let mut automatons = Vec::new();
+    for query in query.split_whitespace().map(str::to_lowercase) {
+        if common_words.as_ref().contains(&query) { continue }
+        let lev = automaton::build(&query);
+        automatons.push(lev);
+    }
+
+    let mut stream = RankedStream::new(metadata.as_ref(), automatons, 20);
+    let mut body = Vec::new();
+    write!(&mut body, "[")?;
+
+    let mut first = true;
+    while let Some(document) = stream.next() {
+        let title_key = format!("{}-title", document.document_id);
+        let title = database.as_ref().get(title_key.as_bytes()).unwrap().unwrap();
+        let title = unsafe { from_utf8_unchecked(&title) };
+
+        let description_key = format!("{}-description", document.document_id);
+        let description = database.as_ref().get(description_key.as_bytes()).unwrap().unwrap();
+        let description = unsafe { from_utf8_unchecked(&description) };
+
+        let image_key = format!("{}-image", document.document_id);
+        let image = database.as_ref().get(image_key.as_bytes()).unwrap().unwrap();
+        let image = unsafe { from_utf8_unchecked(&image) };
+
+        let document = Document {
+            id: document.document_id,
+            title: title,
+            description: description,
+            image: image,
+        };
+
+        if !first { write!(&mut body, ",")? }
+        serde_json::to_writer(&mut body, &document)?;
+
+        first = false;
+    }
+
+    write!(&mut body, "]")?;
+
+    Ok(String::from_utf8(body)?)
+}
+
+fn main() {
+    let command = CommandHttp::from_args();
+    let server = HttpServer::from_command(command).unwrap();
+    server.serve();
+}