implement tilesets struct

src/db.rs

@@ -1,4 +1,6 @@
 use std::error::Error;
+use std::collections::HashMap;
+
 use iron::typemap::Key;
 use iron::prelude::{Plugin, Request};
 use persistent::Read;
@@ -42,3 +44,44 @@ pub fn get_tile(conn: PostgresPooledConnection, schema: &str, table: &str, z: &s
     let tile = rows.get(0).get("st_asmvt");
     Ok(tile)
 }
+
+#[derive(Debug)]
+pub struct Tileset {
+    pub schema: String,
+    pub table: String,
+    pub geometry_column: String,
+    pub srid: i32,
+    pub _type: String
+}
+
+pub struct Tilesets;
+impl Key for Tilesets { type Value = HashMap<String, Tileset>; }
+
+pub fn get_tilesets(conn: PostgresPooledConnection) -> Result<HashMap<String, Tileset>, Box<Error>> {
+    let query = "
+        select
+            f_table_schema, f_table_name, f_geometry_column, srid, type
+        from geometry_columns
+    ";
+
+    let mut tilesets = HashMap::new();
+    let rows = try!(conn.query(&query, &[]));
+
+    for row in &rows {
+        let schema = row.get("f_table_schema");
+        let table = row.get("f_table_name");
+        let id = format!("{}.{}", schema, table);
+
+        let tileset = Tileset {
+            schema: schema,
+            table: table,
+            geometry_column: row.get("f_geometry_column"),
+            srid: row.get("srid"),
+            _type: row.get("type")
+        };
+
+        tilesets.insert(id, tileset);
+    }
+
+    Ok(tilesets)
+}

src/main.rs

@@ -22,7 +22,13 @@ fn main() {
 
     println!("Connecting to postgres: {}", conn_string);
     match db::setup_connection_pool(&conn_string, 10) {
-        Ok(pool) => chain.link(Read::<db::DB>::both(pool)),
+        Ok(pool) => {
+            let conn = pool.get().unwrap();
+            let tilesets = db::get_tilesets(conn).unwrap();
+            chain.link(Read::<db::Tilesets>::both(tilesets));
+
+            chain.link(Read::<db::DB>::both(pool));
+        },
         Err(error) => {
             eprintln!("Error connectiong to postgres: {}", error);
             std::process::exit(-1);

src/router.rs

@@ -1,6 +1,8 @@
 use url::Url;
 use regex::{Regex, Captures};
+use iron::prelude::{Plugin};
 use iron::{status, mime, Request, Response, IronResult};
+use persistent::Read;
 
 use super::db;
 
@@ -38,6 +40,12 @@ fn tileset(_req: &mut Request, _caps: Captures) -> IronResult<Response> {
 }
 
 fn tile(req: &mut Request, caps: Captures) -> IronResult<Response> {
+    let tilesets = req.get::<Read<db::Tilesets>>().unwrap();
+    let tileset = match tilesets.get(&caps["tileset"]) {
+        Some(tileset) => tileset,
+        None => return Ok(Response::with((status::NotFound)))
+    };
+
     let conn = match db::get_connection(req) {
         Ok(conn) => conn,
         Err(error) => {
@@ -46,8 +54,7 @@ fn tile(req: &mut Request, caps: Captures) -> IronResult<Response> {
         }
     };
 
-
+    let tile = match db::get_tile(conn, &tileset.schema, &tileset.table, &caps["z"], &caps["x"], &caps["y"]) {
-    let tile = match db::get_tile(conn, &caps["schema"], &caps["table"], &caps["z"], &caps["x"], &caps["y"]) {
         Ok(tile) => tile,
         Err(error) => {
             eprintln!("Couldn't get a tile: {}", error);